Thanks for reading my story! Be sure to check out my DeviantArt page at tusdine.deviantart.com - you'll find the most recent chapters there, as well as the other stories I've written. Comments, suggestions, and polite criticisms are always welcome! Enjoy!

SAME DIFFERENCE
by tusdine

Chapter 1

Well, here I go: I'm finally putting my thoughts into writing. God knows I've gone over these events a billion times in my head. Sometimes I wonder if I'm even remembering things correctly... I mean, so much has changed since it all started. Back before my story even took place, I thought that the future had almost infinite possibilities, but I never expected what actually happened to be one of them. I'm writing this now in case things manage to change even more, so I at least have a frame of reference.

In that case, I should explain who I am and what I was doing when everything changed. My name is James Blackbourne, but everyone just calls me Jim, even without asking first. I was twenty-three when my story began, but that didn't really mean much. I had been working at the same job for a little over a year by then, and I had no idea where I wanted to go with it. I worked for my state's Parks department as a ticket seller for a large State Park recreation area -- in other words, a big forest. As with many State Parks, this one had numerous official entrances for campers and other visitors, and I worked in a small ticket booth at one of these entrances. One of the lesser-used entrances, to be more precise. I didn't see people very often for most of the year, except when we saw a small increase of visitors in the summer, and sometimes in the winter for tourists who wanted to see a little bit of snow. Some of the more consistently busy park entrances had two employees per booth, to help keep congestion to a minimum and to help take care of the other minor duties. I really didn't mind how slow and uneventful my job was, though. I passed most of the time playing portable video games and reading books. If the cell reception was any better there, I would have been mindlessly surfing the internet, but I tried to convince myself that it was okay to be disconnected from the internet for eight hours a day.

I usually saw my boss, who basically supervised the different ticket booths, about once or twice a day. Old Bill drove around each booth in the area to make sure everything was going smoothly, and would fill in if someone was sick or had an emergency. He was a really nice older guy. Didn't like to waste words, which was fine with me. I'm sure we didn't share much in common, anyway. It came as a surprise to me on this particular day when he was waiting for me at my booth when I arrived. I nervously glanced at my car's clock to see if I had come in noticeably late without realizing it, but I was actually a few minutes early. I parked in my designated spot and waved to him as I approached the booth.

"Mornin', Bill, how are you?"

He didn't return the wave, but nodded and kept his hands in his jacket. Even though it was September, Bill was one of those older guys who was always cold. "Fine, thanks," he said. "Won't be long, just need to talk to you."

"Uh, yeah, sure. What's up?"

"They're adding a second person to your booth." Straight to the point, as always. I was disappointed, but not surprised. This past summer had actually been fairly busy, and there were a few times when I wasn't able to handle everything on my own, but I didn't think it had been a big deal. I had even tried to play it off as a smaller deal than it was, because I had really liked working alone.

"Ah... okay. I gotcha. Do you know which quarter they'll be starting in?"

Bill shook his head very slightly. "It's today. They should have been here by now. I have to get going and begin my rounds. I'll be back around the usual time."

"What?" I sputtered. That caught me off guard. "Today? This is the slowest time of the year."

"Yup," Bill said flatly. "See you later." He walked towards his truck and drove off as I was still processing this news. As I walked into the booth, I kept thinking about every possible negative: this new person was going to be annoying, they would talk all the time, they would eat smelly lunches... Too distraught to begin my few morning duties, I sat in my chair and looked around the small booth. From the outside, it was designed to look like a little log cabin. There was a big window in the front, and a smaller window on the left and right sides that opened so we could perform our transactions with the cars. From side window to side window, the booth was only about six feet long. From the front window to the back wall, there was only about four feet of useable space, due to the mini-fridge and the boxes full of maps, park information, and other trinkets that we sold to visitors. It was pretty comfortable with just me in there, so I sighed deeply at the thought of sharing that tiny space with another person.

About half an hour passed and I kept thinking up more things to be worried about. As time went by, the angrier I got at this person who I didn't know. I have a thing about punctuality, due to a previous job I had. Finally I heard a car pull up and hoped it was just a visitor and that my new booth partner wasn't going to show up at all. I stood up and saw the car park next to mine, and I sighed. Then the car door opened and my sigh turned into a small gasp.

The girl I saw was the cutest little pixie I had ever seen before. She couldn't have been more than five feet tall. I may only be around average height at five-foot-nine, but compared to her, I felt like a giant. Her eyes were a vibrant green and were framed by her short, dark-brown hair that reached down to just above her shoulders. So much of her body was incredibly slender: her legs (all of which were revealed, and they were enticingly smooth), her arms, and her surprisingly thin waist. It took me a while to actually notice all of that, though, because my eyes were drawn straight to her chest. There's no way I can dance around this subject: this girl had some goddamned big tits. I couldn't tell you what her bra size must have been -- I've always been confused with the measurements and band sizes and whatever -- but I can tell you that they looked like a pair of volleyballs stuffed into her purple tank top. But, tank tops being what they are, there was no chance that she had sports equipment in her clothing.

I've always been a fan of really huge tits, and I've seen the word "volleyballs" tossed around like, well, volleyballs, so I feel that I should point out that at her height of five-foot-nothing, volleyballs look even bigger. If you had asked me to describe them immediately after I first saw them, I would have said "basketballs" or something even bigger. I dunno, I've never been one for sports. But man, that tank top. Talk about being burned into my memory. There wasn't quite as much cleavage revealed as you would think -- or prefer -- but I suppose the straps only stretch so far, and you could still see more cleavage than on most other women, especially women as otherwise petite as this girl. The tank top couldn't possibly cover her entire midsection, showing off her tiny waist. Below that, she was wearing booty shorts that displayed just about all of her thin legs.

God, she really was a little pixie... all except for those huge boobs. She walked over to the booth and smiled widely as I stepped out to meet her, but then she walked right past me and looked up and down at the booth.

"Heeey! So, is this it? Ugh, so small!" I don't think she was even speaking to me directly, just saying whatever came into her mind. I was too dumbstruck to care. Then she turned to me very quickly, and her boobs turned as well, just a split-second after the rest of her. I tried my hardest not to stare as they shook back and forth from the momentum. Their size wasn't just amazing, but the way that they pushed tightly against each other and the thin tank top just blew my mind. They looked like they desperately wanted to escape, almost as much as I wanted them to.

"Sorry I'm a little late, but you forgive me, right?" she said as adorably as she could, putting her arms behind her back. Christ, her tits looked like they were going to pop out, and I guarantee you that she knew what she was doing. I didn't even get a chance to respond. "I had some trouble getting my uniform on this morning... then I went to the wrong booth." She held up a uniform just like mine, only much smaller. "See, the shirt doesn't fit at all." She took the dark green, button-up uniform shirt and put it on over her tank top. She made a big show of not being able to get any of the top buttons buttoned as I started wondering if Bill was tricking me and had hired an exceptionally beautiful stripper to trick me.

Against my every desire, I turned my head slightly and held up my arms. "Okay, okay," I said, "Look, I keep a spare uniform. Just wear my spare shirt until you get a, uh... a bigger one for yourself."

The girl smiled. "Great, thaaaanks!" I walked over to my car and pulled out the spare uniform I kept in the back seat. When I turned around, she was right behind me, grinning. She snatched the shirt from my hand during the brief moment I stood there, surprised to see her, then she took a couple steps back and whipped off her tank top, revealing a very unflattering but unsurprisingly massive white bra. I forced myself to politely turn my head again, and gulped. What was WITH this girl?

She buttoned up the shirt with little difficulty, but you could plainly see her huge boobs making an impression. It was even hotter knowing that it was one of my shirts (and yeah, I sniffed it later, like you wouldn't). I cleared my throat nervously. "Well, let me show you around, I guess." Despite saying that, she walked to the booth ahead of me like she owned the place. She was still wearing her booty shorts, which I could now clearly see from behind. Her rear was very cute, like most of her was -- one of those tight little butts. I wondered why her boobs, of all things, were so different from the rest of her.

"Hey, uh, you..." I started.

"Kara!" the girl said with a smile.

"Right, Kara. Don't forget your uniform pants."

Kara made a cute little huff sound. "I was hoping you wouldn't say anything! The shirt is bad enough, but I hate those pants! It's not like anyone can see me below the waist through the window!"

It WAS tempting to let her pass on the pants, but Bill would definitely have some carefully-chosen words with me if I let that happen. "Sorry, Kara. It's not my rule." She kicked the ground and stormed back to her car to grab the pants she had brought. I swear, even that was just plain adorable. Actually, her big tits made it incredibly sexy. I loved watching them shake and bounce, even under my unflattering spare uniform. I forced myself to turn 180 degrees away from her in case she was going to take off her shorts in front of me. She looked so tiny and young that she could have easily been around fifteen or sixteen, and the last thing I wanted was for some tease to get me in hot water. And that mental image wasn't helping things. Fortunately, the topic of her age came up before long, as I was trying to show her the ropes.

She interrupted me for the third time in the five minutes that I had been trying to explain our very simple duties. The way she had to crane her neck up to look at me made her seem like a hungry puppy. God, she was so cute. I think I would have been just as distracted by her good looks even if she didn't have the incredible rack that she did. "How long have you been doing this job?" she asked.

"About a year and a few months," I started. "I did have a desk job with the Parks department for a few years before this, though, and during that time --"

Kara interrupted me. "A few years?? I thought you were, like, 19 like me, or maybe 20!"

I smiled. Once you get into your twenties, it's always nice to hear that you look younger than you are. "Nah, I'm 23."

"Twenty-THREE?" she gasped (so cute!). "So you're over 21, hmm..." she looked like she was coming up with a devious plan. I had a bad feeling about what she would inevitably ask me, sooner or later. I wanted to change the subject, but there was suddenly a knock on the side window behind me. I was really surprised -- I hadn't heard any vehicles drive up. I turned around quickly and saw a woman's torso. Not an overdeveloped one like Kara's, but I could tell at a glance that it belonged to a fit young woman. It didn't hit me at first that I should have been able to see her head in the window.

Kara sighed (her chest rising hugely) and stepped out of the booth. "What are you DOING here?" she asked in an irritated tone. I followed her out to see who this other woman was. I let out a gasp very similar to when I first saw Kara. This new young woman was taller than me. A lot taller. An amazing six-foot-two, as I later discovered. I looked up at her gorgeous face and saw her piercing blue eyes and long blonde hair. Whereas Kara looked like a girl in her mid-teens, this woman appeared to be in her early to mid-twenties. Despite wearing a modest pair of shorts that went most of the way to her knees, she still had more leg displayed than Kara did, in terms of inches. Her bosom, while not exactly flat, was certainly nothing compared to Kara's huge boobs and were covered by a well-fitting blouse that left plenty to the imagination. Overall, she was stunningly attractive, and looked somewhat more athletic compared to Kara's thin pixie body. I couldn't make out any obvious muscles, but she definitely didn't look like a stick, despite her height. Her hips, which were also in direct contrast to Kara's, stood out almost as much as her impressive height. They flared out wider than her shoulders, and despite her shorts, I could tell that she had healthy, wide thighs. The tall, nordic-looking beauty spoke to Kara. "Sorry... you forgot your, um, your lunch."

"Oh geez!" Kara slapped her own forehead and stuck out her tongue. "God, I was such a spaz this morning. Thanks, sis."

SIS? My mind reeled. No fucking way. She was kidding, right? These girls were polar opposites of each other. I had to get to the bottom of this. "Oh, is that your sister?" I asked, completely casually, as if it didn't sound like a goddamned stupid question, asking if the tiny, busty brunette and the amazonian viking queen were sisters.

Kara turned to me as if she didn't know I had been standing there. "What? Oh yeah, Tara's my twin sister. You can totally tell, right?" she said, winking. TWIN? My mind was reeling. This was some bizarre gene-splicing experiment gone horribly right... it had to be.

The tall one, Tara, smiled politely at me. "Oh! It's nice to meet you... um..."

I snapped out of my thoughts. "Jim. I'm Jim." That's when I realized that I never had a chance to introduce myself to Kara, and that she probably didn't care anyway.

Tara turned back to Kara. "...You drove here? Kara, it only took me twenty minutes to walk from the house..." Wait, I thought, they live that close? I knew there were residential homes not far from the park, but I had never seen these girls before.

Kara put up a hand to stop her from talking. "Look, I SAID I was a spaz this morning. I got lost."

As the sisters bickered, I tried to breathe normally and collect my thoughts. Just what was going on? Then I heard Tara speaking to me and I focused.

"It was very nice meeting you, Jim! Take care of sister, okay?" Tara turned to walk away, revealing her outrageously round and big ass. Even the wide hips didn't prepare me for what I saw. Her butt stood out from her backside by what looked like a foot and a half, maybe more. These girls truly are complete opposites, I realized.

This job suddenly got very interesting.

Chapter 2

Kara's first day of work continued on, uneventfully, for the most part. The fears I had before Kara and her stunning body showed up had been proven, though: that girl sure could yammer on... and on... and on. I wasn't able to get out more than a "uh huh" or "hmm" before she would move on to her next sentence. Normally, I wouldn't put up with that sort of behavior. I'm a polite guy by nature, but if someone is rude enough to blather on all day like Kara had been doing, I would have usually do something about it. Today, however... I couldn't help but be entranced by her figure. Every part of her was wonderful to look at, from her slender legs and arms to the smallest waist I had ever seen to her enormous breasts. Kara was so caught up in herself that I could have probably zoned out and stared at any part of her I wanted, but the thought of doing so was too creepy and weird for me, so I tried my hardest to maintain eye contact. Even when I was doing that, I could easily see the shape of her breasts as they pushed my uniform shirt out in my direction. With the booth being as small as it was, it seemed like they were ALWAYS within my personal space.

I tried to convince myself that, despite her looks, there was no substance to Kara. I wanted to prove something to myself: that I could resist the charms of an impossibly beautiful young woman and have some amount of self-respect. That plan didn't work out. First of all, I realized that trying to prove anything to myself was a futile effort, especially because I wanted to touch Kara so goddamned bad, no matter what she did or said. Secondly, whenever I tried to push her out of my mind and ignore her, my thoughts went straight to her twin sister. Those long legs, the face of a mature young lady with the enticing blue eyes and long blonde hair, and that massive ass... sigh. These twins couldn't have been more different unless one of them was a different race, species, or gender. Like lots of guys, I had imagined my share of fantasies involving identical twin sisters, but the thought of two girls who each embodied very different aspects of feminine beauty had already become my new favorite fantasy. They were like two sides of the same coin, or two pieces of a puzzle that, when connected, contained all of the greatest female physical qualities. I must have been completely absorbed in the thought of the two sisters connecting like puzzle pieces, because I was snapped back into reality by Kara's voice.

"Hey, Earth to Jim!"

"Uh, what? Sorry." I muttered, embarrassed.

"I asked you when I can take my lunch break."

I pulled out my phone to check the time: 12:20. "Go ahead and take your time now. I usually eat later, anyway." The thought of getting to spend two hours away from her constant chatter -- one hour for her lunch and another for mine -- brightened my mood a little bit. That didn't last long, though, as she took her lunch bag out of the mini-fridge and started eating a sandwich. I'm not sure what I expected. Her other options would have been to sit in her car or under a tree. While her mouth was full, I decided to take control of the conversation. 

"So, you and Tara. You're really twins?"

Kara swallowed her bite of sandwich. "Yeah. I know, I know! 'That's so crazy,' blah blah blah." I started to apologize, but she interrupted me. "It's fine, I get it. We look so different, but if you knew us, you could tell that we were definitely related."

"Well, I don't know either of you, but I'd be happy to get to know you both." Did I really just try to flirt with the annoying buxom girl?

"You'll get to know me really well," Kara said with a smile. "It's just us in this booth." Did the annoying buxom girl just flirt back? Part of me (guess which one) definitely hoped so. The rest of me was worried that she was the type to flirt with everyone, or that I had misinterpreted what she said. 

I couldn't help but notice that as the afternoon went on, Kara was a LOT quieter than before, and actually let me finish explaining our simple daily routine. She still had a tendency to do things without thinking first, and to try and finish my sentences. She seemed to have no "off" switch. It was cute in a way, but I already had the impression that she was the sort of girl I normally wouldn't want to spend time with. But, as she had pointed out, we were going to be spending a lot of time together from now on, so I realized that I should try and find something positive to focus on. Apart from her body.

Once I had finished up explaining the basics to Kara, we still had about an hour left before quitting time. As she was during my explanation, Kara remained a lot quieter for the remainder of the day. I didn't think much of it at the time except that it was nice to not be bombarded with random stories that didn't seem to pertain to anything in particular. As we were closing up to leave, I asked Kara how her first day was.

"Um, slow! But I kinda thought it would be." She started walking to her car, ahead of me. From behind, I could just barely see her boobs extending past her torso, when her arms were at the right position. Wow. She quickly turned to face me, which made my heart start to race, as I thought she had somehow caught me staring at her. "Hey... I wanna apologize for earlier. I must have bored you to DEATH by talking so much. I was really nervous and I guess that's how I deal with that."

I took a sigh of relief. "Uh, no problem. I'm glad you calmed down."

"Yeah! Thanks for your help today. See you tomorrow!" She turned back around as quickly as before, and got into her car, started it, and drove off before I could even respond. I wasn't sure what to think of her. Her personality seemed to have gone through a few changes since I met her just this morning, and there were definitely parts of it I didn't care for. I figured that nobody's perfect. I tried to focus on the positives, which isn't something I often do, but it was better than stressing out about my job from now on.

I don't even remember what I did at home that night. The next thing I remember was pulling into my parking spot at work the next morning. Kara was, much to my surprise, waiting at the locked booth. I think she realized that with the September heat and the small booth that the uniform pants she wore yesterday were too uncomfortable, and on this day she was wearing the official uniform shorts. Nothing flattering or indecent at all, but it was nice to see some of her skinny legs.

More importantly, she was wearing a uniform shirt that seemed to actually fit her. Quite well, in fact. It wasn't quite as big as the one I had let her borrow the day before, but it was definitely bigger than a girl her size would wear if she had a somewhat "normal" pair of tits. She had tucked in as much of the shirt as she could into her shorts, which were belted up very tight. Her volleyball-sized boobs stood out from her chest so enticingly, and beneath them, the shirt went almost perfectly diagonally into her shorts. The buttons on the upper half of her shirt looked a little tight, but kept everything under wraps.

I waved at her as I approached the booth. "Morning! Looks like you got your uniform squared away."

Kara giggled, almost like a sweet bird chirp. "Yeah, I went to pick up a new shirt after work. Don't worry, I didn't forget about yours! ...Actually, I did. I already texted Tara, she'll be dropping it off later today." I wasn't too worried about getting my spare uniform back, but I was pleased at the thought of seeing Tara again. 

The morning passed somewhat quickly, although Kara would still occasionally change the topic of whatever we were chatting about and go on and on about topics I didn't even understand. She seemed to make references to media that I was unaware of, and what must have been inside jokes or stories between her and other people. I've always thought that I was a pretty good listener, but Kara really pushed my politeness to the limits. Despite this, she didn't seem particularly self-centered, and now that I knew that she did it out of nervousness, I wasn't upset at her for it. I hoped that she would become more comfortable with me soon, so we could have conversations like normal adults.

Right around Kara's lunch break, her completely unidentical twin walked up to the booth, carrying my neatly folded uniform shirt. She hadn't even been walking quickly, but she took long strides with her beautiful legs. Today, she was wearing a pretty skirt that went down to her knees and an unbuttoned blouse with a white shirt underneath. I couldn't help notice that her breasts looked a little bit fuller than I remembered, but that was likely because when I first saw Tara, I was still in shock over seeing Kara's amazing rack and everything seemed smaller in comparison.  Tara handed me my shirt as I thanked her for bringing it. I swear she blushed a little, which seemed almost strange on a woman of her tall stature. She looked like she could be a haughty model-type, except for her surprisingly full hips and rear end. The kind of woman who was so sick of compliments that she ignored them completely.

"Oh, it's... it was nothing," she said quietly as she ran her hand through her hair, putting some behind her ear. The boldest part of my brain told me to try and be cool.

"Well, it means a lot to me, especially because I got to see your smile." I wasn't sure if that was cool or awful, but I had said it, and I figured the damage was done. What was the worst thing that could happen? I make it horribly embarrassing to spend every day working with her sister?

Tara blinked, then she actually chuckled, which then turned into a real laugh. I nervously laughed as well. She turned to Kara and said "I need to get back to work, so... I'll see you tonight, I guess?"

Kara rolled her eyes. "Of COURSE you will, you nerd, we live in the same house!" Tara just smiled, waved, and walked off. Her round, firm booty moved from side to side with her hips as she walked. Even beneath the modest skirt, it looked fantastic. I especially liked how the bottom of her skirt was lifted a little in the back due to being draped over her large ass. I wished it was shorter so I might have seen more. Kara snapped me out of my daydream by slapping my shoulder a little. "I think she likes you, Jimmy!"

I smirked at her. "Whatever, I've barely interacted with her."

"I was just messin' with you, anyway. She's usually too caught up in her work to think about anything else. I'm glad that she has been walking over here the last couple days, so she actually sees the sun."

"Hmm," I said, "She mentioned her 'work', too. Does she work out of your home?"

Kara looked a little hesitant for a second. "Kinda. She's been working on something of a personal project for a long time. Our mom started it, actually."

Their mom? If she was half as attractive as the twins, she had to be an incredibly sexy woman. "What does your mom do, exactly?"

Kara's eyes started looking downward. "Our mom died a couple of years ago, actually. Our dad, too... car accident."

My heart sank into my stomach. "Oh god, I'm really sorry, Kara..." However, she waved her hand dismissively.

"No, no, it's fine - you didn't know." Kara smiled slightly, but her eyes still revealed her true feelings. "I'm just lucky that I have Tara. When we're together, everything is alright. You could say that we keep each other strong."

Kara was eager to change the subject after that, so we just talked about completely casual things for the remainder of the day - television shows we liked to watch, movies we were looking forward to, that sort of thing. There wasn't much overlap in terms of hobbies or taste, but we had a lot of fun when we did share something in common, and our conversations were becoming very enjoyable.

Near the end of our shift, Kara seemed to be a little physically uncomfortable. She was rolling her shoulders a little and squirming in her seat. After several moments of that, she asked me "You don't mind if I breathe a little, right?" and, before I could answer, she undid the top button on her shirt. That was surprising, but not the results of her doing that: there had clearly been a lot of pressure, so even just the one button being undone caused her huge tits to squeeze slightly out of her top, giving me an amazing view of her cleavage. Seeing just a little bit of her tits like that was enough to drive me crazy. Kara just seemed a little relieved. "Sorry, I was just feeling kinda restricted. I'm guessing this is fine?"

I tried, I really did try, to play it cool. "Yeah, sure, so long as there are no visitors and Bill isn't around..."

Kara giggled. "Great! I'll have to do this more often. Feels SO much better." She gently waved a hand in front of her cleavage, as if to cool it off. I know that I was definitely getting sweaty now. That's when I realized that her other buttons also seemed like they were stressed... much moreso than they were this morning. As usual, I tried to think of a rational explanation, but the evidence was right in front of my eyes. I figured that there wasn't anything I could do or say about it, so I was just anxious to see what tomorrow would bring.

As we locked up the booth to leave for the night, Kara waved and said "I'll see you in a couple of days!" That really threw me off. My schedule was six days a week, as the park was closed on Mondays. This particular day was a Wednesday, so I didn't know what Kara was talking about. She noticed my confused look and said "Didn't Bill tell you? I'm only working part-time."

"Oh, okay. Bill is a man of few words, so I'm not really surprised he didn't mention anything. I gotta say... it's going to feel a lot different being in the booth by myself again."

Kara giggled and pressed her upper arms slightly into the sides of her boobs, causing even more flesh to squeeze out of the top. "Well, don't worry, you'll see us again reeeal soon, Jim! Bye!"

That's when I knew that she was definitely a flirt. A couple of days without her... the quiet would be nice, but I was very anxious to see how she looked when she came back to work on Saturday.

Chapter 3

Those two days of work without Kara felt like the longest two days of my life. I found that I really missed having company, and I even missed the times when she would ramble on and on. She had quickly grown on me, having made such an impression on me based first on her looks and then on her personality. And speaking of growing...

I got to work a little early on Saturday morning, in case Kara had done the same, so I could see her sooner. Were her boobs going to be any bigger than they were two days ago? The logical part of my brain was screaming "OF COURSE NOT, IDIOT", but the rest of me was imagining a million different scenarios, all of which started with "what if they had?" As if I was trying to convince my logical side, I went over the facts in my brain. Fact: Kara was a very thin young woman with boobs that rivaled volleyballs in size. Fact: That is considerably larger than the vast majority of women, particularly women as otherwise waifish as Kara. Fact: Having briefly seen them in just a bra, I was very sure that they were not fake. ("But that's not a 'fact', that's an assumption made because you've watched too many tittie videos on the internet," thought my logical side.) Fact: There are a very small percentage of women whose breasts continue growing throughout their lives. And finally, fact: Kara's smooth, pale breasts were definitely having a lot more trouble fitting into her shirt by the end of her second day compared to that morning.

Clearly, I was too anxious, as I got to work almost half an hour early. I couldn't even distract myself by reading a book or playing a video game - I just kept glancing at the road in front of the park entrance, hoping to see Kara come walking towards the booth. Finally, a few minutes before we were supposed to start our shifts, I saw Kara. I promptly told my logical side to take a hike.

She seemed to be wearing the same uniform shirt as she was two days ago, but it was not tucked in like it was before. The top button was still left unbuttoned... as well as the second button. Kara's breasts were noticeably bigger. There was no denying it. The shirt was much more strained than it had been the other day, and you could see diamond-shaped openings in between each button on the large portion of the shirt that was wrapped around her breasts where the shirt was being stretched out. I could make out her white bra through some of the diamond-shaped openings, but I could clearly see her breast flesh squeezing through the upper openings.

After a couple days of wondering if her breasts had been getting bigger, I had proof jiggling right in front of me, and I felt like I had the right to point at Kara's breasts and shout "Ah-ha!" as if I had won a bet. But what could I do? Nothing but pretend like I didn't see anything. She was definitely past the appropriate-work-attire line, but I wasn't her boss, so the last thing I wanted to do was make both of us feel uncomfortable working together. So, all I could do was smile and give her a small wave hello.

"Hi, Jim! Feels like forever since I was here!"

It sure had, I realized, as I watched her too-tight shirt jiggle as she walked towards me. "Yeah, it's good to see you. How... uh, how have you been?"

We made small talk as we got settled into the booth. I was curious - and a little anxious - to see how Bill would react to Kara barely fitting into her uniform. Clearly, Kara was concerned as well - when Bill showed up for his brief checkup, Kara was conveniently holding an opened map of the park in front of her, as she feigned interest in it.The rest of the day went by really quickly, as our conversations had become a lot more interesting. I realized that I was developing a bit of a crush on Kara. Before this, it had been a purely physical attraction, and I couldn't stand her personality, but the more I got to know her, the more I liked her. I really didn't want to make things weird at work, though. 

I was wondering if Kara would need to unbutton her shirt even more, like she had done a couple of days ago, but before she had the chance to do so she stretched and yawned, which caused her to pop a button completely off her shirt. The whole thing happened so fast, but felt like slow motion as I watched her big boobs seemingly grow out of their confined space and jiggle like crazy. I could see the upper part of her bra, which looked almost as tight as the shirt, with Kara's boobs overflowing out of it.

I didn't know what I should do or say. "You okay?" I asked, feeling like an idiot.

Kara blushed a bit and sighed. "Yeah, yeah, I'm fine... I think I'm going to need to borrow your spare shirt for a while, though."

"It's not my only other shirt, just the one I keep in my car in case of, uh, accidents..." I mumbled. "Okay, sorry, I have to ask... what's going on?"

"My boobs just popped out of my uniform, duh," Kara said with a little eye roll.

"Yeah, no kidding. Did you shrink your shirt or something?" I figured there might have been a more reasonable explanation.

Kara giggled. "Nah, I'm still growing. More than usual lately."

It was true! More than usual? I quickly started explaining to Kara how I would like to discuss this but didn't want to get sued for sexual harassment or anything and she just laughed. "Jim, these are obviously a big part of me and it would be silly if we had to pretend that they're not here." No arguments there.

"So what do you mean you're still growing? Like, since puberty?" I tried my hardest not to sound creepy.

"Kinda. They got a lot bigger than most girls' really quickly and then slowly kept growing. Sometimes I would go a while without any noticeable growth, but then I'd suddenly gain a little more. Lately, I've really been filling out, though..."

"Uh, yeah, I can see that." I wanted to keep talking about this, but pried myself away to grab my spare shirt from my car again, in the case that a visitor showed up and saw us in a very suspicious circumstance. I turned away so Kara could remove what was left of her other shirt and put mine on. When I was allowed to turn back around, I suddenly remembered that Kara hadn't been wearing a shirt that was meant for a woman of her stature, breasts notwithstanding, and had been wearing a larger shirt to accommodate her swelling chest. While my shirt was bigger than that, it wasn't the huge jump in size that I was expecting, so I was a little surprised to see her huge boobs filling it out. She wasn't at the point where she was stretching it, but it was very clear that she had a giant pair of tits squeezed into it.

Kara saw the problem with this, too. "Hm. I... am going to have to buy some much bigger shirts right away." There was a small pause, then she giggled. "This is exciting!"

That comment stunned me. "Wha... really?" I asked.

"Well, yeah!" she said with a big smile. "Don't laugh, but I've always loved my boobs. Until really recently, I thought they were as big as they were gonna get. Naturally big, anyway. To think that they might still be growing as I reach my twenties? That's so cool!" She hugged her breasts as I tried to think about baseball or something.

We chatted for a few minutes more about what it was like for her to grow up with huge breasts. She said that she and Tara were homeschooled by their parents, so she never had to deal with teasing kids or lustful boys and Tara wasn't teased about her height. "Oh, wow," Kara suddenly said as we got ready to leave for the night. "I totally forgot that you barely know Tara. I'm just so used to being with her all the time. You need to come over for dinner after work tomorrow so you two can get to know each other."

Come over? That sounded like a fantastic idea. Especially the part about seeing Tara again. And ESPECIALLY the thought of seeing Kara wearing casual clothes and squeezed into a non-uniform top. I agreed, perhaps a little too enthusiastically, and we each went home for the night. I had a lot of trouble falling asleep that night, for a couple of reasons... one of them being that I couldn't stop thinking about the sexy young woman with her huge, and still developing, breasts, which then lead into the other thing that kept me awake.

The next day, Kara's breasts seemed to have swelled up a little more. I probably wouldn't have noticed if I hadn't been specifically looking for a change, though. My (former) shirt seemed a bit snugger on her chest. We didn't talk about her breasts at all that day - I was too worried about sounding obsessed and creepy, and I think she didn't want to talk about it unless she was asked to. The day seemed to drag by as I anxiously awaited for our after-work dinner plans at Kara and Tara's house. When the time came to leave, I decided to walk with Kara. She had said that it was only a twenty minute walk or so, and since it was still late summer, I knew it would be light out until late in the evening so I could walk back safely.

We walked along the main road for only several minutes before turning down a small dirt road that lead into the forest (outside of park boundaries, of course). It was just about wide enough for a car, but I had never noticed it before due to its size and how it blended in with its surroundings. Before long, I could see their house. It was surprisingly big - not a mansion, but still a lot bigger than I expected. It seemed to be very old, and as we approached, I could tell that it appeared like it hadn't been inhabited in a long time. I would have been concerned, but I was too excited to go inside.

When we entered the house, Kara ran towards the staircase immediately. "Gotta get changed!" I felt more than a little awkward, standing by the front door all by myself. Fortunately, Tara entered the hallway and walked over to me with a smile. The first thing I couldn't help but notice was that her breasts had also done some growing of their own. They had been B-cups, or maybe C-cups the last time I saw her - it's hard to say for sure since I never got a good look, and because of her height - but she seemed to have a healthy pair of D-cups beneath a pretty white blouse. Part of the reason why I noticed this so quickly was because her breasts were closer to my direct line-of-sight than they were last time. ...Had Tara actually grown... taller? It seemed bizarre for a split second before I realized that if her twin had continued growing at the age of 19, it would make sense for Tara to grow, as well. But still... Tara was a good 6'2 when I first met her, just a few days ago, which is very tall for a woman. But then, I thought about Kara and how she was "bigger" than most women in her own way. These sisters really were something else.

"Hello again, Jim," Tara said with a smile. She brushed her long blonde hair behind one of her ears, a cute move that practically made me weak at the knees. Like her twin, Tara was a gorgeous young woman. Unlike Kara, however, who had a sexy "barely legal" look to her, Tara looked more like a gorgeous young teacher or librarian who had already put their hair down to reveal their beauty. "Let's go into the kitchen, if you don't mind, so I can finish up dinner and we can talk." I nodded, silently, trying not to look like a baby bird with my neck craned up to look upon her wonderful face.

Tara turned to lead me into the kitchen and my eyes practically popped out of my head. She had been growing in another way: her large, round rear end had noticeably expanded since I last saw her. Maybe it was because she was in the comfort of her own home, but instead of wearing a modest skirt or dress, Tara was wearing a pair of tight shorts. I knew right away that those shorts hadn't always looked so small or short on her, just like with Kara's shirt. There was no way for me to do an accurate measurement right then and there, but I think her huge, round butt was at least two feet in width, from side to side. I couldn't even imagine how big her full hip measurement must have been. That's when I had a thought: if Tara's breasts had grown a bit in addition to her already-tall legs and already-big ass, did Kara do a little bit of growing in her lower half? I had been so preoccupied thinking about (and sneaking glances of) her still-growing boobs that I hadn't checked out the rest of her recently. 

When we reached the kitchen, Tara invited me to sit on a bar stool at the counter right next to the kitchen proper. I asked if she needed any help, but she said that everything was just about finished. I checked out her amazing body as she bent over to take something out of the oven, and when she reached up to grab a box high up on the shelf. We started chatting during this time, mostly about working with Kara.

"So, Kara told me that you work from home. That must be pretty nice," I said. 

"Oh, um, it's alright. I can't imagine having to work with others on my, uh, projects. I do my best work alone." She seemed a little nervous, talking about this.

"I hope you don't get lonely being stuck in here all day. I worked alone in the booth before Kara started, and now the thought of working by myself again seems so weird."

Tara smiled. "Perhaps you should come by for dinner more often, Jim. I think Kara would like that."

That sounded great to me. "Hm, she's taking a while upstairs, isn't she?" I asked.

"Well," Tara began, as she walked closer to me and lowered her voice conspiratorially, "I truly think that Kara is fond of you. She's obviously lingering upstairs so that we can get to know each other better. Kara knows that a man won't do unless her twin gets along with him."

My face must have been beet red. "Wh-really? You think she likes me?" God, I sounded like a tween. 

"It's very likely. Of course, she might just be trying to be good friends with you so that it's easier to spend all day together in cramped quarters."

I was in heaven and hell at the same time. If Kara did like me, that would be great, but if she didn't and I tried to make a move, my job would become painfully awkward at best. My thoughts were cut off by Kara's entrance into the kitchen. She was wearing a silky white camisole over her wonderful chest, revealing most of her shoulders and a hell of a lot of cleavage. Seeing those two swelling mountains of flesh surging out from her top almost made me light-headed. Her skin was remarkably creamy, and I could see her boobs jiggle madly with each step as they moved from side-to-side as much as the tight camisole would let them. I would have been able to easily see her nipples through the camisole, except she was still wearing a white bra underneath. It made sense to me: with boobs that big it must be a necessity, especially since she wasn't used to the extra weight yet. And besides, she probably wanted to have a little bit of decency around me. 

"So, how are you two doing?" Kara asked us with a grin. Even as she casually breathed, I could see her breasts practically heaving.

Tara finished placing dinner on our plates. "Very well, Jim is an extraordinary man." That made me blush. We grabbed our plates and headed into the dining room to eat. I made sure to trail behind the sisters, so I could get a look at Kara's butt. She was wearing little gym shorts, but sure enough, her booty seemed a little bigger than when I first met her. I had trouble focusing on that, however, with Tara's massive rear swaying from side to side as she walked out of the kitchen. I noticed that she was having trouble fitting into her shorts due to her recent growth: she had bent down enough during the dinner preparation that the shorts had become wedged between her deep cheeks, making them look more like booty shorts. They were even tigher around her ass now, showing just how firm her round cheeks were, despite their size. I could also now see the bottom couple inches of her butt. Holy shit. If I never saw these girls again, they would still be all I could think about for the rest of my life.

Even the act of sitting down for dinner was an incredible turn-on for me. Being short and having her noticeably-larger-than-volleyball-sized breasts, Kara had a little difficulty. As she sat down into her chair, her boobs rested on the table before she had finished lowering the rest of her body. When she had been completely seated, her boobs took up a huge portion of her line-of-sight as they sat on the table. Used to this problem, Kara simply turned her seat to the side a little, causing her tits to move with her and soon fall off the table and hit her chest. They jiggled like crazy and seemed to take a while to finally slow down enough to stop moving. It was entrancing. I supposed sitting like that would have to do for her, but I wondered what she would have to do if they got even bigger. 

As far as Tara was concerned, I realized right as she started sitting down that these old, antique-looking chairs might be... somewhat too small for her. Sure enough, the chair couldn't quite accomodate all of Tara's sprawling booty. I couldn't even see the seat with her sitting in it, her rear extending to each side of the chair.

I can hardly even remember the actual meal or the casual conversation anymore. After we ate, the girls suggested that we sit in the living room to talk some more. Kara and Tara sat together on one end of the couch and I sat on the other end. What a view. Fortunately, before long, Tara brought up the subject that had been on my mind.

"Kara tells me that she's done a little growing on the job, Jim. That must have been quite a shock."

"Yeah," I tried not to grin too widely. "I didn't expect her to pop right out of her uniform."

Kara and I chuckled at the memory, and she started lightly caressing the exposed part of her breasts. It seemed like she was doing it without realizing it and I wasn't going to say anything. Tara said "I'm sure you've noticed that she's not the only one who has been growing lately."

I thought she was referring to the erection that I was desperately trying to hide before realizing she meant herself. Tara looked a little taller than she actually was due to her huge, round ass lifting her up. She utterly dwarfed her twin sister by sitting next to her. I said "Uh, yeah. I didn't want to be rude or anything by pointing it out. You both look amazing, for what it's worth."

The girls smiled and thanked me. I continued, "Still, it's hard to believe you're sisters. But you're both growing in the same ways, well, at different speeds, anyway."

The sisters gave each other a brief and very serious look, then turned back to me. Tara spoke. "Jim, would you like to know the reason why we look so different and have each developed greatly in different ways?"

I didn't know that there would be an actual reason for it, and I was excited to talk about their bodies some more, so I nodded. My mouth felt dry.

"When our mom was pregnant, we were supposed to only be a single baby," Kara began. 

Tara continued, "Typically, the egg cell splits very early on in the pregnancy. In our case, however... There was a rare problem that caused the cells to divide far too late."

Kara: "It looked like we were going to die in the womb. Best case scenario, we would have been born too weak to live for very long. But our parents were scientists, and they wanted to find a way to save us."

Tara: "They worked quickly and with all their energy. They didn't have much time, so they tried the most likely cure as soon as they could, without testing."

Kara smiled widely. "It worked, of course!" I grinned. This was so crazy!

Tara said, "The treatment saved our lives. It seemed like it was strengthening our bodies, particularly the parts that were severly weak, to a point roughly equal to regular children."

Kara looked mischevious. "Everything was normal for a while, until puberty. I guess the treatment didn't just strengthen our weaker genes. Some parts of us developed a lot faster, and bigger, than with other girls our age." She stroked the exposed top of her left breast as she spoke.

Tara crossed her long, powerful legs. "Which brings us to my work. Our parents did not like to discuss the details of the treatment and had decided to count their blessings and never tamper with it again, after our birth. After their death, however, I found some of their old notes and I have been trying to decipher them to see what exactly they did."

I spoke up. "Does this have to do with the fact that you're still growing as much as you are?"

Kara nodded. "Yeah. Tara wants to make sure that we won't see any more side-effects later in our lives. I'm happy enough with just growing!" 

Tara blushed and shrugged ever so slightly. "I don't know how familiar you are with biology, Jim, but our story may sound pretty strange to you. To be honest, it's what our parents explained to us, and they refused to discuss it any further. I want to deduce the truth about our condition and what our parents did. In the meantime, we have to be satisfied with their unrealistic story."

That made sense to me... I guess. I actually knew so little about science that their original explanation was more than sufficient for me. Based on her expressions, I think it was good enough for Kara, as well, and I'm sure Tara wished that she could accept it as the truth. I talked to them about their story for a little bit to show them that I was listening and understood. Soon, I noticed that it was getting dark out. "Ah... I should probably walk back to my car before it's too late."

Both girls looked a little disappointed. Tara said, "Of course. It's too bad you need to leave. We'll have to do this again soon; it was very nice having company."

"Yeah!" Kara said. "Hey, the park is closed tomorrow. Since you don't have anywhere to be, just crash here tonight!" The idea of spending the night in the same house as these goddesses was too much. I knew that nothing would happen, but to spend more time with them talking about their spectacular bodies - or anything, really - sounded fantastic.

"Well, sure, but I don't want to impose or anything," I said. 

Tara grinned. "It's no imposition, Jim. This sounds like a great idea! There's a spare bedroom you can sleep in. It will be nice to continue our conversation. I think I'll have a glass of wine; would either of you care for a glass?"

"Yeah, sounds good," I said. My mouth was dry from nervousness. Kara turned down the wine. Well, it was settled. I would be crashing here for the night. Looking over at Kara and smiling, I couldn't help notice that she seemed to be swelling out of the top of her camisole a little more than she had been earlier this evening. I couldn't have guessed what crazy direction the night would end up taking.

Chapter 4

I finished my second glass of wine as we continued talking. I wanted to be polite and, well, not-pervy, so I had been trying to bring up topics other than the twins' bodies. I already knew a bit about Kara from our time working together, so I would ask Tara questions about her favorite movies or hobbies, while occasionally asking Kara another kind of question so that I wasn't ignoring her. Somehow, though, one or both of the sisters would steer the discussion towards their bodies. The girls seemed so preoccupied by their own appearances. I guess when I put it like that, it sounds like they obsess over clothes or makeup or hair. That's true, I suppose, but with Kara and Tara those subjects always related to their impressively growing bodies. Tara mentioned the different kinds of pants and skirts that she prefers to wear, and the differences between how she dresses in public versus while at home. I never knew how complicated it would be to try to accentuate one's features without being "too brazen." Kara would somehow start talking about using a (relatively) small amount of makeup on her cleavage to make her breasts look better. (Better! Can you believe it? They always looked so full without appearing overstretched, and so heavy while still looking like the softest pillows in the world.) I had to admit that I had never heard of using makeup on cleavage.

"Haha, I bet most guys haven't heard of that. Girls have all kinds of tricks like that," Kara said. "Anyway, I don't do it at work, so you've never seen me do it before. I'm SUPPOSED to be all covered up there!"

"Yes, and it sounds like you've done a terrible job at that!" laughed Tara, which made Kara giggle and thrust her chest out like she was popping out of her shirt. Her huge boobs shook and jiggled like crazy in response. It was VERY difficult to avoid staring. And drooling.

"So, you only do it when going out for fun?" I asked. Kara shook her head no. "Nah, I don't really get out much. Neither of us do. We've never really socialized and we're so used to each others' company." That sort of explained why I shared so much in common with the twins: none of us got out much.

"That's why I suggested that Kara get a part-time job," Tara said. "I've been so focused on my work that I haven't been good company, I'm afraid."

Kara grinned. "I feel kinda lame taking a job with barely any human interaction, but I feel more comfortable that way."

"Yeah, just imagine if you had popped out of your shirt in a busy store," I chuckled. Whoops, now it was my turn to talk about expanding parts, I guess. "Have you always grown so... suddenly, like that?"

The girls gave each other a brief knowing glance, then Kara answered "Yyyeah, I guess. Just sudden spurts like that." That made me wish I could have been a fly on the wall for each previous burst.

Before we knew it, it was well past midnight. I hadn't had too much to drink, but I was getting sleepy nonetheless. The twins showed me a guest room I could sleep in that was down the hallway - their rooms were both upstairs, so there would be a bit of distance between me and them. It was just as well - I didn't want to risk doing anything while under the influence.

Despite being sleepy and a little drunk, once my head hit the pillow I felt like I could stay awake forever. My life felt so strange now, in a good way that gave me butterflies in my stomach. I never thought that I would meet a woman - let alone TWO - with bodies as incredible as Kara and Tara's, and their bodies were gradually expanding in such unbelievably sexy ways, at that. I'd be the happiest man on earth to be with either one of the sisters even if their more exaggerated features were of "normal" proportions, but to think that they were huge and still growing just got me so excited. After lying in bed for a while, still unable to sleep despite growing more tired by the moment, I decided that I should get a glass of water to prevent any chance of a hangover the next morning. I probably wouldn't be getting much sleep, so I wanted to feel as comfortable the next day as possible.

The hallway was dark, so I pulled out my phone and turned on an app that functioned as a flashlight so I could find the kitchen. I got myself a drink of water and started quietly making my way back to the guest room, when I suddenly heard a voice behind me say "Jim?" I turned around, a little frightened by the sudden noise, and saw Kara. I instantly noticed that she he was wearing the same camisole as before, but it was clear that she was no longer wearing a bra underneath. I couldn't get a good look because it was dark, and I didn't want to shine my phone's flashlight right at her chest, but from what I could see it was clear that her breasts were remarkably firm and barely sagged at all.

"Oh! Sorry, did I wake you? I just needed some water."

Kara shook her head. "No, I was up already, I just heard some noise." She grimaced uncomfortably, as if she was feeling a bit of physical pain. "Ugh, I'm actually not feeling very well. My breasts are hurting, but I don't know why."

This was something I was concerned about, since the twins explained how their unique features weren't completely natural. "Uh oh, is this one of the possible side effects Tara was looking for? Do you need any help?" I asked.

"It's fine, probably. Sometimes the girls get sore when they're growing," she said, her grimace turning into a sly grin as she moved closer to me. "Hey, maybe this means they're getting ready for a really BIG growth spurt." Kara was right next to me by this point. Even in the darkness, as I looked down at her face, I could tell that her chest was absolutely massive as her breasts overwhelmed her tiny frame. "I think you'd like that, not that you would ever admit it. It's been kinda funny watching you act like my growing boobies and my sister's huge butt are no big deal." She chuckled as my breath quickened. I'm no stranger for turning on the charm for the ladies from time to time (but not nearly as many times as I would care to admit), but this whole situation was so unique to me that I had no idea how to react and I felt so nervous. Before I even had a chance to react, Kara's sexy grin turned into a pained grimace again.

"Oh shit, are you sure you're okay?" I asked, worried.

Kara began to deeply rub her hands over her basketball-sized breasts. It would have been ridiculously erotic if she hadn't looked so uncomfortable. "I'll... I'll be... fine..." She fell to her knees. I turned my phone's light to her face and I could see that she had started to sweat profusely and her skin was flushed.

"Don't move - I'll get Tara. I'm sure she can--" I started to say, only for Kara to fall to her side. I panicked. "TARA! COME DOWNSTAIRS!"

Tara dashed downstairs in mere moments, thanks to her powerful legs. Seeing Kara lying on the floor, she gently lifted her and carried her upstairs, whispering to her unconscious twin the whole time. Not knowing what to do at first, I stood there in the dark for a short while, then went upstairs. I was unfamiliar with this part of the house, but I headed straight for the only room with a small bedside lamp turned on. Tara had already put Kara gently down on the bed, so the room seemed to be Kara's. Tara sat next to her sister on the bed, and checked her pulse as well as her temperature with the back of her hand.

"Jim," Tara said calmly and quietly, "Would you please stay here with Kara until I return? I need to collect a few things for now." I quietly responded yes, and took Tara's place sitting on the bed. Kara was very flushed and sweaty, and she was breathing as if she had just run a marathon. Even now, looking back on these events, it's difficult to think about the specific details. Needless to say, I was extremely concerned for Kara, especially as I had just learned that she and Tara were basically unwilling experiments since before their birth. I knew they wouldn't be here today without that, but looking down on Kara's pained form, I wished that there had been another way to save the girls' lives that wouldn't lead to this current state.

With every passing second I also worried that something would happen to Tara. If she collapsed somewhere in the big, dark house, I wouldn't have any way of knowing unless I left Kara behind to check on her. I felt like I would mess up and do the wrong thing no matter what. As I debated in my head over what to do, Tara fortunately returned with some damp cloths, some over-the-counter medicine in bottles, and a few other odds-and-ends. I quickly moved out of the way. Tara sat down, took out a small pair of scissors, and cut open Kara's too-tight camisole. Kara's breasts, now looking a light shade of red as if mildly sunburned, pushed the cut shirt open and rolled heavily towards each side of her chest. Tara placed one damp cloth on Kara's forehead and used another, larger, one to slowly wipe over Kara's breasts. I felt a lot weirder standing there, doing nothing, than I was a moment ago. "Tara - is there anything I can do to help? Do you need me to get anything else?"

Not taking her attention away from her sister, Tara replied "To be honest, it would help a lot if you got some sleep tonight. I'm glad you're here and are free tomorrow because I'll need some help then." I left Tara behind with Kara and went back to the spare room downstairs. The walk back was so eerily quiet. I passed right out but woke up just a few hours later, as the sun was just barely rising. It was even earlier than I would have woke up if that had been a work day. I quietly made my way back to Kara's room to check on the situation and saw Tara right where I left her, whispering to her sister again. Kara had a thin bedsheet over her body up to her neck and she looked a little better, although still a little flushed. Her breathing seemed normal. Tara must have heard me approach, as she turned to see me and gave me a weary smile. I couldn't believe how gorgeous she still looked.

"How is she doing?" I asked.

"She appears to be stable," Tara said quietly. "I do need for you to go into town and get some more supplies so I can help Kara properly, but none of them will be open for a few more hours."

I sat on the floor next to the bed and rested my back against the wall. "Hope you don't mind some company until then," I said. Tara smiled again, a much happier smile than before. We talked almost nonstop for the next few hours. It reminded me of the most recent day I spent at work, in the booth, with Kara - when the two of us had finally grown comfortable talking with each other. For all their physical differences, the two sisters were actually a lot alike. From what I could tell, they both seemed to approach things in different manners, but often ended up with the same result. Basically, all of the differences between the sisters were just skin deep.

A couple of hours later, Kara's peaceful-looking rest seemed to be making a turn for the worst again. After cooling her down again, Tara seemed to have a burst of inspiration. She excused herself as she dashed out of the room. She returned barely half an hour later with a needle and injected a tiny amount of liquid into Kara's right arm. As Tara removed the bedsheet to reach Kara's arm, I could get a good look at Kara's breasts again - they looked swollen, not in a good way, but bloated and were a darker shade of red than they were earlier.

Around ten o'clock, Tara asked me to run the errands that she had mentioned. She needed a variety of things from a department store as well as from a home improvement store. I wasn't sure how any of these individual items could be used on their own or even in various combinations, with one notable exception...

"A breast pump?" I asked Tara. "Like, for nursing?"

Tara nodded. "That's right. They're pretty expensive, but I have some cash you can use. Thanks so much for your help, Jim." Without questioning it any further, I made my stops. The home improvement store was in the next town over, so it took me a couple of hours altogether to get everything that Tara had asked for. As soon as I returned, Tara wasted no time in taking the supplies to her workspace downstairs. When she returned, she seemed to have taken the breast pump and made some adjustments to it. The cups, which would each cover most of a normal-sized woman's breasts, had been replaced with larger versions that seemed much more appropriate for Kara. The pump itself was small, about the size of a handbag, as it could also be used with battery power when needed. It didn't seem like it would do much for Kara, but Tara seemed to know what I was thinking and said that she had "made some quick improvements". She plugged it into the wall socket and moved Kara up the bed a bit, presumably so she could attach the cups. The originals were meant to be held in place either by hand or with a velcro vest that covered up the chest, but neither of those options would work right now.

However, instead of attaching the cups like I thought she would, Tara first applied some lotion to her hands and I practically gasped as she began to gently caress Kara's swollen breasts. This would have been insanely erotic for me at any other time, but Kara still looked like she was feeling awful and her breasts looked painfully uncomfortable, but I was still a bit shocked at the sight of the tall blonde goddess caressing the little brunette nymph. Once Tara's hands had seemed to cover Kara's expanse of boob, Tara began to rub harder and faster. She was really squeezing Kara's breasts roughly, and I could see the pained expression on Kara's unconscious face. After a couple of minutes, Tara's hands moved to Kara's swollen, dark nipples, which were now about as half as long as one of my thumbs and a little under an inch wide, surrounded by her puffy areola, which were six inches in diameter. As with the breasts, Tara began to gently stroke the nipples for a bit, which caused them to start becoming erect. Tara's gentle touch seemed to do the trick, as the nipples quickly reached what appeared to be their full size at about twice where they started. Tara grasped each of Kara's nipples in her hands, each one barely longer than a man's thumb, and began to squeeze them as she pulled on them, one then the other, over and over. Nothing seemed to happen for a while, although Kara began to grimace more as sweat formed on her head, chest, and breasts. After what felt like forever, I noticed some thick sweat forming on Kara's nipples... although I quickly realized it wasn't sweat at all.

Milk leaked out of Kara's left nipple, and then her right, onto her sister's hands. Tara continued milking Kara. I just stood there, completely shocked, and embarrassingly aroused. I was suddenly surprised by a squirt of milk that practically shot out of one of Kara's nipples, landing somewhere in the room. (I later realized how strict my own parents had been about making sure I never spilled anything, since one of my first thoughts when seeing the milk shoot up was "Good thing these are wood floors.") 

Tara suddenly turned to me. "I need you to take over for a minute, Jim, I have to get the pump set up." I barely believed what I was hearing but did not hesitate for a second to grasp onto Kara's slippery nipples. I began squeezing and pulling them like I had been watching Tara do, and noticed just how taut and incredibly full her breasts were as I did so. Logically, I knew that this was honestly one of the least arousing or sexy things I had ever seen or done... so of course I was painfully engorged in my own way and loving every second of it as Kara's breast milk leaked all over my hands and arms and squirted up, occasionally landing on me. Guilty pleasures are the best. 

Mere minutes later, Tara was ready to attach the pump to her sister. I didn't really want to stop but I knew it was best for Kara. I helped lift Kara up some more and lean her forward so that Tara could wrap the homemade top around her chest. She shifted it around so that the huge cups, a couple inches wider than her areola, were over Kara's nipples. There were long, thick tubes going from the breast pump into the cups, as well as tubes from in front of the nipples that each lead to separate empty gallon jugs on the floor. Once this was all set up, Tara turned on the machine. I was so worried that something might go wrong, but Tara seemed so confident in all of this that it helped take a lot of the pressure off of the situation (and out of Kara's breasts, I hoped).

The pump whirred to life and about half a minute later we could see milk being pumped out of Kara's nipples. Another half minute later and the milk was coming out so fast and consistently that we could only see white in the cups. Like magic, we began seeing a huge improvement for Kara - her breathing calmed down, her skin began to take on a shade much closer to her typical pale color, and she no longer looked miserable. Everything was silent for a little bit, except for the whirring of the pump, until Tara and I both burst into relieved laughter.

"Oh my god," Tara exclaimed. "This has been the worst day!"

I grinned at her. "You were amazing! Kara looks so much better now." Tara thanked me and then we both started laughing again. I guess she had been even more concerned than me despite her cool attitude - Kara IS her sister, I thought. Tara and I sat down on the end of the bed, feeling exhausted. We each had a few tears in our eyes from laughter and stress, and we turned to face each other, me looking up at her, Tara looking down at me. The laughter stopped as we embraced each other, Tara bending over slightly, and we kissed each other forcefully.

Chapter 5

Our kisses lasted long and felt forceful as I held Tara close and she did the same to me. I had never had to raise my neck to kiss a woman, which ended up feeling a lot better than I thought it would be. After a few minutes, I started moving my hands down to Tara's waist. When she was next to Kara, as she usually was, Tara's waist looked comparatively huge. Kara was lying down and her wasp waist was mostly covered up, though, so I could see Tara for who she was. Her waist was anything but huge, looking more like a sexy fitness model's. As with every aspect of these girls, I could not possibly take a preference for one aspect of them over another - I was crazy about how Kara looked like a tiny corset model without the actual corset, and I was just as obsessed with Tara's powerful midsection. She wasn't built enough that she had any kind of six-pack showing, but you could tell that her abs were strong.

Tara seemed to enjoy my arms around her waist, and she moaned quietly. She suddenly stopped kissing me. "Jim, I'm sorry," she whispered. "This is... we can't do this."

I was crushed, but before I could say anything, Tara continued: "Let's go to my room. I don't want to disturb Kara." I tried to hide my smile. Following Tara, as always, was the sort of activity that could turn any day into a great one. And since she was wearing too-tight booty shorts that revealed a couple inches of butt-cleavage which jiggled as she made her long strides... this day was getting better by the second. As soon as we entered Tara's room, she wrapped her arms around my torso, lifted me up a couple of inches, and planted another firm kiss on my mouth before releasing me. Things just kept happening beyond my control, and I loved it!

"I just can't control myself right now," Tara gasped. "I've, uh, I've never actually kissed anyone before now. I guess I just got overwhelmed."

"Trust me, it's fine!" I said happily, making sure to omit just how long it had been since I had been kissed. "You're actually very good at it."

Tara beamed. "Oh, THANK you! I didn't know how to ask! But we should probably talk before anything else happens." I agreed, and she continued. "I know that Kara likes you, a lot. Even if the signals weren't so clear, I would know because I feel strongly about you and I haven't known you as long. I-I just couldn't hold anything back after what we all went through just now."

This put me in a tough spot. Ten minutes ago, if I had to choose a girl for some reason, it would be Kara. We'd known each other a little longer and a little better. I didn't know if Kara was trying to flirt with me the night before, but Tara definitely made a move before she did. Mostly, I was just horny and overwhelmed. I tried my best to do what seemed right instead of messing up and possibly ruining a relationship with either girl. "I already like you a lot too - and not just because you kissed me!" I added quickly. "But let's put this all on hold until Kara recovers."

"Yes, that sounds like the best option," Tara sighed. "But definitely not the most fun." I gave her a big hug.

I offered to watch over Kara while Tara took a much-needed nap. Afterwards, I spent the rest of the day talking with Tara while we kept an eye on Kara. Her boobs had managed to produce almost half a gallon of thick, creamy milk each, and she was looking a lot better overall. Before I knew it, it was getting late again, and I knew I needed to go back to my apartment so I could rest up and get a clean change of clothes for work the next morning. I wasn't looking forward to another day in the booth without Kara to keep me company.

As I went to leave the house, Tara said "Jim, you're welcome here absolutely anytime. Here's a spare key... just let yourself in."

"Aw, thanks, Tara. That means a lot to me. I hope I don't take advantage of your offer and start bugging you both all the time," I said as I pocketed the key.

Tara smiled warmly. "I would actually look forward to that - it might prevent my sister and I from arguing so much when we're alone!"

---------------------

I wasn't even able to sit calmly in the booth for the last couple hours of work the next day, as I was incredibly anxious to see the Aras (a silly nickname for the twins I only used in my own head). Once I was off the clock, I drove the short distance to their practically hidden house and unlocked the door as quietly as I could, in case Kara was sensitive to any noises at the time. I didn't hear any activity downstairs, so I went up to check on Kara.

Tara was in Kara's room, setting up the breast pump. Kara was, much to my pleasant surprise, wide awake but still lying down under her blankets. She gasped with joy when I entered the room. "Kara! How are you feeling??" I asked as I walked towards her bed.

"Pretty great, actually!" she said excitedly. "But Tara wants me to rest a while longer."

"We need to be careful!" Tara sighed. "This is very risky... ah, anyway, it's time for Kara's pumping."

"Just let Jim help me out. You said he helped yesterday, and I just BET he's fine with helping again."

Tara gave the two of us a concerned look while I grinned sheepishly. "Well... I suppose you two need to catch up. I'll be working downstairs if you need anything." With that, she left the room.

I sat next to Kara. "We were really worried about you. Are you sure you're okay?"

"Better than okay, really, I feel great. And I'm really glad you're here, we need to talk."

We sure did. "Actually, I need to tell you something. Tara and I kissed yesterday, and--"

"I KNEW it!" Kara said. "I didn't even get around to telling her that I liked you, and she goes and kisses you first! That is SO like Tara."

"Well, uh, it was sort of--" I fumbled. 

"That's what I get for being so obvious. So you two kissed, at least you got to second base with me. And now again, while I'm actually awake this time, you dork!" With that, Kara pulled down her comforter and sheets, revealing her naked chest. A lot more of it than I had ever seen. Kara's phenomenal breasts were nearly twice the size they were yesterday.

"HOLY!" I yelped. "How...?"

Kara looked extremely pleased with herself. "Guess my body had trouble keeping up with my development," she explained, positioning herself so she was sitting upright in the bed. Her amazing breasts, which just yesterday were roughly the size of basketballs, now rested in her lap and extended a few inches on each side of her torso. "I feel like I'm over some huge hurdle. Jim, I'm serious, I feel AMAZING. These," she squeezed her massive mamms together, "THESE feel amazing. I can't even explain. I really do need your help, though, I'm super full." She took my right hand and put it on her left nipple. Even at their default size, her nipples were almost as big now as when they were fully erect yesterday. I was speechless. 

Kara leaned forward, squishing her huge chest against me, and kissed me sweetly on the lips. "Now I'm even with Tara! Now let's do what she can't. God, I'm glad you're here to help me do this instead of my sister." I couldn't bear to tell Kara that Tara started off this process last time... and my head was swimming what with everything that was happening. In any case, I didn't need to be told again. I rubbed and squeezed her nipples, gently at first, and then gradually harder. It was a little difficult to tell since she was lying down, but it looked like her areola were a full foot away from her chest. I savored the feeling of her smooth skin in my hands as I pulled on her hardening nipples. Kara's eyes were half-closed as she quietly moaned in pleasure. The milk began dripping out at first, then it quickly became more of a constant leak. "Yes, Jim, oh yes, like that," she whispered to me. Once the milk started to squirt out of her nipples, Kara brushed my hands away and I reluctantly helped her put on her pumping vest.

"That was... crazy," I said, breathing heavily.

Kara closed her eyes and arched her back as best as she could as her hands lightly stroked the sides of her breasts. "Mmm... it sure was." She grimaced slightly when her hands reached somewhere around the middle of her extremely full milk tanks. "Jim, could you pretty please help me a little bit more?" she said as sweetly as she could, her lips pouting. Doing so made her look at a lot younger than her actual nineteen years, and when I took into account the fact that she was caressing boobs that were around a foot in diameter, there was no way I could decline any request she made. Not that she waited for me to agree, anyway. "I need you to, like, rub this lotion onto my boobies."

I snatched the bottle of lotion and squeezed some onto my hand in a heartbeat. I started rubbing slowly, covering every inch of this new flesh that had just staked a claim as one of the most important things in my life. Her skin was incredibly smooth already, but it did feel sort of tight - I'm sure she needed this lotion after growing so much and developing gallons of milk in such a short amount of time. Kara looked like she absolutely loved my touch, which made me want to keep going even longer than I already did - forever. Before I knew it, though, her pumping session was over and Tara appeared in the doorway right after. A little TOO fast, really.

"Ah, I thought I heard the pump stop," Tara said oh-so-casually as I started to help Kara remove the pumping vest. "Oh, Jim, don't bother with that - I'll take care of her. Kara really needs to rest up again, now. Thanks for your help. We'll see you tomorrow, I hope?" Tara was really giving me the bum's rush and wasn't being subtle about it. Normally, I would stand up for myself in this type of situation, but as usual I was speechless when confronted by the twins. I actually didn't mind - it had got me THIS far, and the last twenty minutes had been a memory that I would never forget! In fact, I would remember it again when I got home! I said goodbye to Kara, who was pouting in a not-so-cute way at her sister who was towering over her.

I made my way back downstairs and got my shoes on by the front door. I stood up and reached for the doorknob, when a hand suddenly appeared and held the door shut. I turned around to see Tara again, standing directly in front of me. I'm telling you, she was like the world's tallest ninja at six feet, four inches tall - seven inches taller than me, at this point. I gulped. Tara's chest was right in front of my eyes now, and had grown a little bit past the double-Ds she was sporting the other day. She moved her stunning face closer to my left ear. I swear - if every other part of these girls was average, their faces alone would still rank them among the most beautiful women alive. "Kara reacted pretty much as I thought she would," Tara whispered in my ear. Her voice was so sexy that my eyes rolled back a little. "Let's let her think she's winning, for now. It'll make it all the more fun when we do things like this."

Tara pulled back from my ear and turn completely around. Or, at least she tried to. Right around the time her right side faced me, I was smacked hard in the lower stomach and pelvic area - her enormous ass had prevented her from making a complete 180 this close to me. Seeing her from the side, it looked like her rear end projected from her hips by about two feet. Her hips didn't look much bigger, if at all - her recent growth below the waist had been completely in her butt, her amazingly round cheeks curving upward and reaching far below the normal spot where a butt would end.

She didn't let my body stop her from turning. Tara sllllowwly dragged her huge cheeks across my midsection, putting a good amount of force into it. If I hadn't been pushed up against the front door I would have been knocked down instantly. Tara only moved forward the bare minimum to allow her butt to graze past my body, until she finished turning and was facing completely away from me. More than two feet from side to side, her massive rear extended far past my own hips on both sides. My entire crotch as well as my lower stomach and upper thighs were pressed up against these firm cheeks.

Tara barely moved her hips, yet it made her entire ass bob up and down, rubbing against my body. I was already about to explode but I think my body was determined to see just where this would lead. Tara started to slowly move her hips more and more, causing her butt to grind against me faster and her booty shorts to wedge up between her cheeks. Now it looked like she was wearing a thong. The skin on her ass was flawless - part of me was worried that it would look like it belonged on an obese woman, but it was as tight and smooth as a model's. Only much, much, larger.

This was torture and I loved it. Tara leaned back and turned her head so I could see her face right in front of mine. "Jim, we --" But she got cut off by a loud beeping noise coming from down the hallway. To my utter dismay, Tara pulled away from me, fixed her wedgie, and smiled at me. "Sorry, that's for one of my experiments! I have to finish this immediately." Tara ran off down the hallway, yelling "I'll see you tomorrow! I've got a surprise for you!"

I knew I had to get home IMMEDIATELY.

Chapter 6

I was so anxious to return to Kara and Tara's house that I called in sick the next day. I felt a little bad since it meant that Old Bill would have to take over the shift that day. On the other hand, I had a lot of sick days piled up - since I worked alone and didn't have to do any real physical labor, I typically went in to work if I was sick but feeling well enough to get out of bed. I got plenty of rest sitting in the booth. Anyway, I'm sure Bill could use a day to rest in the booth himself instead of inspecting all the gates.

It was difficult to not drive to the twins' house so fast that every cop in the county would be alerted to my presence. Once I arrived, I used the key Tara had given me and let myself in. As soon as I had closed the door behind me, however, I was spotted by Kara, who was completely topless - I'm sure there was nothing in this house she could possibly wear. It was so great to see her up and walking again! I had almost forgotten just how short she was, especially after spending time with Tara recently. At around 5 feet tall, maybe a tiny bit more, Kara was even shorter to me than I was compared to Tara. I couldn't see her tiny waist anymore as it was hidden by her massive breasts, which appeared to be a little bigger than they were yesterday. Of course, it was hard to tell because she had been lying down, but it was a safe bet that both girls were a little bigger in their special ways. Kara's hips appeared to be a little bit wider than the last time I had seen her walking around, too. I was sure that her butt had grown some as well, although not nearly as much as Tara's had been. I couldn't wait to see it.

"JIM!" Kara yelled as she ran towards me, her gigantic juggs heaving. My first instinct was to be worried about that much breast flesh coming towards me at that speed, but was quickly replaced by anticipation. Kara's tits reached my body well before any of the rest of her could and squished heavily against me, holding me against the front door. This truly seemed to be my lucky door. That's when I realized that, due to their extreme height differences, Kara's huge boobs were at roughly the same level that Tara's tremendous ass was at yesterday evening. And honestly? That was the perfect part of my body for their expanding parts to be squishing and rubbing against.

Kara pressed her breasts into me even harder as she stood up on her tip-toes and leaned towards me for a kiss. I met her part way. "What are you doing here so early??" I told her about calling in sick, and she leaned into me again for another kiss. "Great! Like, I'm so glad you're here. Tara's in her lab - well, it's really the garage, but she's made, like, a ton of changes to it. Anyway, I've got you all to myself!" She took my hand and led me upstairs to her bedroom. My heart started racing in my chest and I'm sure I had a goofy grin on my face. It was amazing watching her breasts bounce from behind, as they extended past either side of her chest by a few inches. When we reached her bed, Kara had me sit on the end. Our eyes were on a more even level now - still a few inches away from the same height, but I didn't have to tilt my head up or down to see her face. Her bosom seemed to take up most of my peripheral vision below her neck and her nipples, which were only a couple inches away, were at about the same height as my mouth. Due to the fullness of her breasts, however, each nipple was not directly in front of me so I needed to turn my head slightly to the left or the right to see them.

Leaning forward slightly, Kara pushed her huge boobs into my face. The sheer size and weight of those knockers would have pushed me right down, but I quickly held out my arms on the bed to catch myself. She used her hands to squish and press them all over and around my head, sending me straight to heaven. They were incredibly warm and soft, but at the same time there was a distinct firmness to them. I definitely had had other experiences with breasts before, but apart from the massive size, there was something a bit different and wonderful about Kara's. Feeling them all over my head gave me an idea of how they were able to maintain such a full, round shape even without a bra on. The sisters' bodies truly were masterpieces of science, and I wished I could have shook their parents' hands.

I repositioned myself on the bed so I wouldn't need my arms to hold me up, then reached my hands up around both sides of my head, near the back, to find Kara's nipples. I rubbed her soft areolae and nipples, which caused Kara to gasp and moan in pleasure. She moved her hands closer to mine, allowing her arms to continue pressing her breasts against my head, and grasped my hands. My thumbs were free and I used them to rub her nipples, which made Kara squeeze my hands tight. While doing this, I was kissing as much of her breasts as I could without being able to move my head.

Kara suddenly pulled back, stared at me with a wild-eyed look of arousal, and leaned down and forward to give me a powerful kiss. We made out for about a minute before she pulled back again and held one massive breast in front of me, the nipple brushing against my lips. "I pumped earlier this morning," she panted, "and I'm not due again for a while." I opened my mouth, causing her half-aroused nipple to fall in. I started licking and sucking on her elongated teat, and I could taste a bit of leftover milk. It was delicious. Her nipple finished growing and now took up most of the space in my mouth. I was so excited that I almost choked. Kara switched nipples, but moments later, she pulled back again. She had a displeased look on her face.

"Darn, Tara wasn't lying," she said bitterly.

I was breathing heavily. "What? What's going on?"

Kara sighed. "Like, after you left yesterday, Tara said that me and her need to be careful about getting too turned on. Something about our hormones being 'severely imbalanced' right now. I didn't know what she was talking about, but... I'm starting to feel kind of sick, and very uncomfortable in some places." She pouted, looking greatly disappointed. "I thought for sure she was just trying to, like, keep me away from you."

That was a huge letdown for me. "Well... I guess... we can just hang out for now? No need to rush anything if it'll make you sick." The logical side of my brain, which hadn't been getting much of a workout lately, really didn't want to have to worry about Kara being ill again after what had recently happened.

"Yeah... I'm really sorry!!" Kara whimpered. "It's not that I don't want to..."

"No, no, I totally understand! It's okay."

"Thanks, Jim. Um, I don't want Tara to say 'I told you so' or to think that this gives her some kind of advantage in stealing you away. Whenever she gets out of her lab, could you, like, tell her that you just got here?" I nodded. I would do whatever she asked me to right now. "Hey, let's, like, watch a movie downstairs. Okay?" Kara's face beamed again, which raised my spirits.

"Sounds good! It'll be like a date," I said. That made Kara tackle me while giving me a big kiss, knocking me over on the bed.

A few hours later, we were discussing what we should make for lunch, when we heard the door to the garage open. Tara soon entered the kitchen and smiled when she saw me. "Jim, you're here early!" She was wearing a tight button-up shirt that was only about half-buttoned, revealing most of her now nearly E-cup breasts. Like Kara, she had given up trying to fit into anything in her biggest area, and was only wearing a stretched-out pair of panties that barely covered any skin.

"Uh, yeah, I took a half-day. Just got here a little bit ago."

"Well, that's excellent. I was looking forward to telling you about the big surprise today, so I'm glad I don't have to wait until later. Let's have lunch first, though, shall we?"

We decided to make sandwiches. I had one and a handful of potato chips, but the girls each had two sandwiches with extra ingredients and they split the rest of the chip bag. I hadn't realized that they must need a lot of extra energy with all the growing they've been doing, especially lately. Tara was going to need a new chair soon - she was overflowing the seat even more than the last time we ate together, and unlike Kara, she couldn't rest her extra growth on the table. As I ate, I started to wonder if Tara's breasts would ever reach the point where she needed to rest them on the table, or if Kara's butt would require a stronger chair. I quickly realized it was probably a good idea to not let my mind wander on these subjects - not until much later. After eating, Kara collected our plates and took them into the kitchen. Tara leaned towards me and whispered "I heard your car pull up this morning. I'm glad you lied about your 'half day' - Kara is definitely going to think you're on her side." Then she gave me a quick kiss on the lips and went to the kitchen to help her sister, brushing her gigantic ass against my body as she walked away. I felt dizzy but on top of the world! Each sister was encouraging me to fool around with the other and to lie about it. I didn't want to jinx anything, but it seemed like I was going to "win" no matter what I did. Of course, I felt like a bit of a heel, but I was intoxicated by these sexy sisters and this crazy sibling rivalry game they were playing with me as the pawn. A pawn with aspirations to be King.

Finally, we sat down in the living room so Tara could spill the beans on whatever this "surprise" was. "Well, Jim, I'm sure Kara has already told you about the recent changes to our hormones." That made Kara pout again and Tara continued. "The truth of the matter is, the growth that we have been experiencing in the last few weeks isn't exactly natural, nor is it the result of our parents' genetic tampering. Not exactly, anyway."

"What do you mean? Some kind of surgeries?" I asked, confused.

Tara shook her head. "No, it's the results of my experiments and research. We weren't exactly honest with you the other night - I'm not just making sure that we won't have any defects or other problems later in life, I've also been discovering a way to enhance the genetic improvements." Kara blushed a little when Tara said this.

"Wait, you've been making yourselves grow on purpose?" I couldn't believe what I was hearing, but I liked where it was headed.

Now it was Kara's turn to speak. "Jim, our bodies stopped growing at just about the size we were when we first met. We, like, don't get out much, but we KNEW that we were way above average. In lots of ways! Just look at us, it's SOOO obvious. And we loved it!"

"It's true," Tara agreed. "Growing up was extremely pleasurable for the both of us. We didn't experience any of the growing pains or other discomforts that girls go through during puberty, in fact, we both found our various growth spurts to feel quite good. I remember the distinct tingling sensation in my hips and rear... it was so nice, it often woke me up at night."

"Jim," Kara said, almost like she was pleading to me, "It was just awful when we stopped growing. It was like losing one of our senses."

"I'm sure it sounds strange to you, but in a way, our development defined us. We love our bodies," Tara said. "So I've been working diligently to find a way for us to continue growing. It wasn't as easy as just reactivating a gene, though. I was able to make us grow a little bit over the last few weeks, but I could only make it go so far without extra help."

Kara rubbed her huge, naked, boobs. "I don't understand how it works, but Tara said that we needed some other way to trigger the growth, so she used my titties!"

"That's right. I concocted a formula that would cause Kara to develop milk... a special, enhanced milk that would kickstart our hormones again and make us continue to grow!"

My mind was completely blown by all this news. They WANTED to keep growing, bigger and bigger? They loved their bodies that much?? This was the greatest thing I had ever heard. That's when I remembered that I had tasted a little bit of dried milk on Kara's nipple that morning. "Uhh, can the milk affect anyone like that?"

"No," Tara explained, "It was designed to only affect our unique genes. It wouldn't have any affect on another person. But I'm glad you asked, because that's where you come in." Oh no, I thought, they don't want to give me boobs or a huge butt, do they?

"W-what do you mean?" I asked, nervously.

"The big surprise is this," Tara started, but got cut off by Kara: "We wanna offer you a job!"

"A job?" I asked. "What kind of job?"

Both girls grinned at me. It was almost scary! "We would like to hire you as our personal assistant," Tara said. "As we continue to grow, it will become increasingly difficult to do certain tasks. You would help keep the house in order, and help us with meals, for starters."

Kara wrapped her hands around her nipples. "There's more, too... like helping me with my pumping."

Tara shot a glare at her sister. "Hm, we'll see about that. So, you can move into one of the spare bedrooms right away. You'll get plenty of free time as well as a generous allowance. Anyway, there's a big task we'd like you to handle first."

"Wait, I haven't even agreed yet!" I said. "I mean, I already have a job, and..."

"So you're turning us down?" Kara said, sadly.

"God, no, of course not. I'll take the job!"

"Good!" both sisters exclaimed at once.

Tara continued explaining this first task. "I actually need to hire two other assistants. Lab assistants, to be precise."

I was a little surprised that Tara was willing to work with other people on her secret experiments. "Um, what kind of qualifications should I be looking for?"

After thinking for a moment, Tara said "One of the assistants should be a woman. The other assistant's gender isn't important. And one of them, either one, should have a little experience working with lab equipment. Not a lot, just enough to be familiar with basic chemistry equipment. I would prefer that the other assistant have as little knowledge of science as possible, but not a complete dullard."

"Those are some odd qualifications, Tara," I pointed out.

"I have my reasons," she purred. "Oh, and most importantly - the fewer connections they have with friends and family, the better, in case something goes wrong or they prove to be a liability to the secrecy of my work."

I chuckled, but stopped when I saw the twins' dead serious expressions. "I'm not joking, Jim. What I'm working on here cannot be leaked by anyone." I'd never seen this side of the girls, but I was really glad that they liked me so much.

"Ah, speaking of leaks..." Kara stood up. "I'm due for a pumping. Jim--" she paused, remembering how she felt earlier. "Er, I'll just take care of this myself. See you in a bit."

Kara went upstairs to take care of her milk, and Tara remained silent until we heard Kara reach her room. "Finally, a little time for me and my personal assistant," Tara said in a sultry tone. She stood up, looking as tall and impressive as ever, and did a sexy catwalk over towards the couch I was sitting on. The way her hips moved side to side as she walked was stunning, but it was even more incredible how I could make out her massive ass as it extended a little past her hips on either side and bobbed low enough to see it on either side of her thighs when she walked. Upon reaching me, Tara opened her legs and sat down on my lap as close to my upper body as she could, her torso pressed against mine, and her large breasts in my face. Amazingly, her gigantic ass filled up the rest of my lap just about all the way to my knees.

I pulled my head back from her spectacular bosom and looked up to talk to her. "I thought you two couldn't, er, do anything because of the hormones?"

"It's true," she said, wrapping her arms around my body. "But Tara is the one with the biggest imbalance right now, thanks to the specialized milk she's producing. We may as well see just how far I can go and have some fun doing so." That was fine with me! I moved my hands around to touch her enormous ass that I had been staring at and thinking about like crazy recently. It was so strong and firm and I'm sure you could bounce whatever coin you wanted off of it. A LOT of coins at once, at that. I gave each of her cheeks a tight squeeze and Tara squealed cutely. "Oh WOW," she said breathlessly, "That is the best thing I've ever felt. I can't wait for us to be able to actually make some noise so you can get REALLY rough with my ass." That set me over the edge and I continued squeezing and caressing her ass as hard as I could.

"Jim, that's sooooo gooood..." Tara squeezed me tighter and we kissed sloppily, hungrily. "Jim, please, let go, I need you up here." I looked at her, a little confused. "I may not be busty like my sister, but my girls aren't exactly small, and I AM a woman... give the girls some pleasure." I eagerly let go of her ass and brought my hands up to her chest as she leaned back a little to give me room. I started to unbutton her shirt, but she said "Just rip it open - it barely fits and it won't fit at all before long, I'm sure." That's all I needed to hear. I tore open the rest of the shirt, unleashing her beautiful breasts. It's true that they didn't compare at all to Kara's, but there's never anything wrong with a pair of E-cups on a sexy woman. I squeezed her tits and rubbed her nipples with my palms. Tara began to squirm and grind her huge ass on my lap. I took her left nipple in my right hand and used my thumb and forefinger to gently tweak it, causing Tara to shut her eyes and moan a bit louder than before. She took one of her fingers and bit down on it to prevent herself from crying out in pleasure. I used my other hand to squeeze her right breast and licked her nipple.

Unfortunately, it seemed we found Tara's breaking point. "Oh geez, damn, I apologize," she said, panting. "That's where I need to stop. I wish I could continue..."

"It's okay," I said, breathing heavily. "Will, uh, this hormone thing always be a problem?"

"No, don't worry," Tara said. "Once our bodies adjust to the changes that the milk is giving us, we'll feel better than ever."

Thank goodness, I thought. I figured that I should focus on two things in the meantime: quitting my old job, and starting my new one by somehow finding a couple of lab assistants.

TO BE CONTINUED