THANK YOU so much for waiting! Here it is: the final chapter of Same Difference!

Please continue to send me feedback and comments - I may be done with SD, but I hope to write more stories in the future, and I love to know what people like and dislike and how I can improve in the future. As much as I appreciate the comments on OverflowingBra, it's not really possible for me to respond to them, so please feel free to talk to me through DeviantArt, Skype, or kik - my username is tusdine on all of them. There's also tusdine@gmail.com if you prefer, but please note that I check that account much less often than the others.

Thank you all again for waiting and for reading all sixteen chapters of SD. The story took a number of turns that I didn't expect, but I hope you enjoy the ending. Also: I still plan on releasing a completed volume as soon as some more art for it is completed. Without further ado, here is... 

SAME DIFFERENCE
by tusdine

CHAPTER 16

Emily leaned against the door frame looking like the cat that ate the canary. For a brief moment, I felt like I should be embarrassed to be caught in a compromising position with the two impossibly curvy sisters, but that feeling quickly changed to pride.

"Let me explain. You recently made a deal with me to help save your sister," Emily said to Tara. "And now I have a deal for you. Simply put, I can make all of your dreams come true if you let me help you. But there's something you need to do for me, first."

Tara adjusted her nearly four-foot wide ass so she could sit more comfortably on the bed. "And what is that?"

"Increase my intelligence," she said matter-of-factly. "Allow me to do things that no one - except for you - has ever done before. I can change the world and I can give the three of you everything you've ever wanted."

Tara shook her head. "It's impossible. All these changes we've undergone... they've only been possible due to the way our DNA was altered when we were still fetuses. Even I can't help you with that."

"Oh really?" Emily asked as she crossed her arms and looked pointedly at me. "Then how did you increase the size of Jim's penis?" The sisters and I glanced awkwardly at each other. How did she... "None of you are exactly quiet when you're going at it. And I don't just mean volume-wise."

"I... I did alter Jim, didn't I?" Tara looked confused. Almost dim-witted, which is quite the feat for her. She placed a hand on her forehead as if she was experiencing pains. "But how..."

"I have a theory," Emily stated proudly. "Over the last few days, it's been very clear just how amazingly intelligent you are, Tara. When you put your mind to solving Kara's problem, you achieved the impossible. But even during all of that, you were distracted. You're always distracted."

"Hold on," Kara interjected. "Tara is the hardest worker I've ever known, and she's been, like, obsessed with our plans for so long--"

"Exactly! Obsessed. Tara, you've been focusing all of your staggering intellect towards making you and your sister grow. It seems like whenever you shift that focus a bit, you can do a lot more than that."

It was my turn to speak. "So, when I was injured... Tara, you must have been focused on saving me. And while you were at it, you went ahead and, uh, made me grow a bit."

Tara's mind appeared to be racing as her eyes darted all around. "I see what you mean. Well... there's no harm in trying to boost your brainpower, Emily. But why do you think you can help us once you achieve that?"

"Simple: I'm a lot more creative than you. No offense. You don't know me very well, and I know I don't seem like the creative type, but... let's just say that there's a bit of an artist in me. I've already began to think of applications for your work outside of just this household. Even if I am piggybacking off of your work and using extra brain power, I want to be the one who brings it to the world. I want procedures named after me. Hospitals, even!"

"And what about us?" Kara asked, leaning into her mammoth mammaries and gently stroking their soft skin.

"Let me handle your expansion," Emily explained. "I'll put my focus towards finding a way to make you grow that doesn't require any specially-altered breastmilk or, uh, such 'slow' speed. That will leave you three to simply... enjoy it."

The sisters looked at each other, eyebrows raised. It seemed like an obvious choice. "I think they're willing to make a deal with you," I said.

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

Tara took Emily's words to heart and began to work on the intelligence booster right away. Knowing that she could be more effective if she put everything else aside for the time being, Tara seemed to be working even harder than when she was trying to help Kara. Well, the only real difference was that she wasn't taking regular breaks so that we could fuck and she could let off some steam and scratch that itch. I don't know how she suppressed it, but I guess when you're as smart as her, you can do just about anything if you put your mind to it.

My time apart from Tara gave me plenty of opportunities to catch up with Kara. This was when I finally got to learn the extents of the adjustments that Tara had made to my dick, and balls, and everything related. Kara was VERY eager to fool around with me after being unconscious for so long, and I had really missed her, too. It was a totally different experience having sex with a tiny body like hers, compared to her Amazonian sister. Of course, by this point, Kara's ass was anything but tiny and reminded me of Tara's from when I first met her, except scaled down to Kara's much shorter frame. I got intimately familiar with it, as the best way to fuck her was from behind, with her leaning into her enormous breasts.

Those breasts! Honestly, each time I fucked Kara's pussy it was entirely because I wanted to, so that I could feel the wonderful tightness around my rigid cock. Kara, however, kept insisting that I stick it in her cavernous cleavage and go to town. As each breast was nearly five feet in diameter, there was a lot of cleavage to take care of. I personally liked it best when I was close enough to her face so that we could make out while I thrust my dick between her warm mountains until I erupted another load of cum deep down into the canyon. I think Kara liked that the best, too, but it was hard to tell when she would cutely request me to move to another spot so that I could fuck it. "And try to squeeze harder with your hands, if you can," she would suggest. And "can you thrust harder? I love feeling the vibrations when your hips hit my skin." And, occasionally, when she was able to resist feeling my warm spooge against her skin: "Can... can you, like, bring me your cock when you're almost done... I want, I need, to drink it all down..."

Speaking of drinking, Kara still had to pump her breasts each day until Emily would be able to come up with a different expansion solution. The process, however, had gone from being sort of a nuisance to being the best part of the day. Kara's tits were EXTRA sensitive while the pumps did their magic to express the gallons and gallons of milk out of them. I couldn't be TOO rough, lest I do something to mess up the pumps, but even gentle touches drove Kara wild. We soon had the fridge restocked with the milk: fully restocked. The girls insisted that, for the time being, there was no need for other food items. I have to admit that it was delicious and very filling, especially drinking it right from the source. The only time I saw Tara take time for herself was when she would chug down a whole gallon container of her sister's milk a few times each day for sustenance... and pleasure.

We sometimes (okay, almost constantly) would be asked by Emily to keep our sex noises down, as we were being very distracting to her and Tara as they were working. Kara and I would be embarrassed and happy to oblige, considering the importance of the project, but we just couldn't help it. Before we knew it, we were right back to yelling and moaning.

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

It took a few weeks before Tara called us into the living room/makeshift lab so she could speak to us. I say "called us in", but we were only in the adjoining kitchen at the time. During those weeks, Kara's breasts had grown far too large for her to fit through any of the doors in the house without a lot of forceful pushing and the sound of wood cracking. At least Kara had the option to go through doors if she really wanted to, for some reason. Granted, she had to do it one boob at a time, and that still involved a struggle, even with her advanced strength: too much force might not hurt her, but it could have greatly damaged the house, and we were all concerned about causing some kind of permanent structural damage.

The twins had been thrilled to hear Emily's plan to accelerate their growth speed, but it turned out that they were growing a lot faster even without her help. It became clear mere days after Kara healed that the bigger the girls got, the faster they grew, against all reasoning. Of course, they both lamented how "slow" their expansion was and couldn't wait until Emily was finished. I started to get a little concerned about how the endgame would turn out. Just a little.

So, like I said, it was a few weeks or so after Emily shared her plan with us, and the twins were... significantly bigger. Kara was able to stand up perfectly straight with the bottoms of her absolutely enormous tits resting on the floor in front of her. They extended roughly six feet from her chest to her huge nipples, and over ten feet from the side of one breast to the opposite side of the other. These magnificent mammaries rested heavily against each other by default, and when that happened, they rose several inches above her head and completely blocked her view of anything else.

Kara was beyond thrilled when she had woken up a few mornings before Tara's announcement - she had slept leaning into her boobs, of course - and stood up straight, only to find that she couldn't see beyond her own flesh anymore. That was the first time in weeks that she had actually demanded that I fuck her from behind, so she could have her view completely obscured by her mountains as she ran her hands over as much of her skin as she could. After that, she sent me on a journey to find her nipples so that I could please her without being seen.

Kara's ass was doing its own share of growing as well, naturally. It was a few inches shy of three feet in width, which looked even more huge on her frame. She was well beyond each cheek matching basketballs in size - they seemed to be about fifty percent larger, each, and much more fun to palm. Of course, it paled in comparison to the growth of Tara's rear.

Even though I saw Tara every day - it was impossible not to, what with the girls being limited to the large downstairs rooms now - we had such little personal interaction while she was busy that it always blew my mind a little bit to see her and how she was growing over these few weeks. As always, Tara's ass and Kara's breasts remained very close in size at any given time. Now that Tara's rear was also more than ten feet from side to side, she hadn't been actively working on most parts of the project, but was instead supervising Emily and constantly typing more equations and running simulations of what appeared to be genetic code on a computer. The monitor had to be crudely attached to the wall above her, as Tara had difficulty seeing past her massive, watermelon-sized breasts. She hadn't even stood up from that spot for the last couple days of the project - actually, come to think of it, she might have been standing... by that point, it was very difficult to tell.

Where was I? Oh, right - Tara called us over so she could speak to us. I gave Kara a deep kiss before turning away from her face and crawling out from her canyon of cleavage. She grunted ever so slightly, lifted up her wobbling mammaries, and took slow steps towards Tara's direction. I told Kara when it was time to stop and she gently lowered her immensity as the floorboards beneath us creaked. I ran a hand across a mere fraction of her silky bosom and gave it a quick peck, and I heard a faint noise waaay back from Kara's tiny body, followed by a light quiver across her skin.

From up close, it was easy enough to tell that Tara was currently sitting down, as I could see her thighs (at least three feet wide each) taper down to the rest of her legs which were resting on part of her colossal ass. She looked like some mythological creature, with the upper body of a beautiful, busty, blonde woman and the lower body that was practically all mountainous posterior. Adding to her mythological status was her height: even while she was sitting, it was obvious that she was nearly eight feet tall and was able to lean back and rest her elbows on the top of her over-five-foot-tall ass. It wasn't even strange to me that neither twin was wearing any clothes, but I did have to stop myself from ravishing Tara, especially since it had been so long since I had touched her. Emily was the odd woman out, having a "normal" body and wearing professional clothing, including a lab coat.

"I assume you have good news?" I asked with a big smile on my face.

"Y-yes," Tara breathed. "I... it's... we're..." She let out a moan and bit her lower lip. Her hands began to caress her enormous ass, or at least what little of it they could reach.

Emily cleared her throat. "It's okay, I'll explain." She turned towards me and Kara. "She's done extremely well focusing on her task, and I can't expect her to hold on any longer. I had no idea how much your libidos were affected by these changes... even for an intelligence as great as Tara's, it took a lot of willpower to resist those urges for so long."

I saw Tara's pussy begin to leak as she brought herself to orgasm just from touching her expanded ass. While it looked like she was now in her own world, I knew that she was still able to pay attention - not that she really needed to, since she worked on this project. "Yes," Emily said, repeating what Tara had started. "I have good news. I'll be quick because I can't imagine how eager you all are to begin."

Emily revealed two vials containing a strangely glowing liquid. "This is going to change the world. Of course, I'm going to release the technology slowly, in order to give people time to fully adapt to it. First I'll cure a disease. Then I'll pretend that my work has unlocked the knowledge necessary to cure others. Once the important work is complete, I'll begin using this technology for cosmetic purposes, not unlike yours, but on more... rational level. After that--"

Kara suddenly leaned back in order to separate her breasts so that we could see her face. "I thought you were going to be QUICK?" she said accusingly, then, possibly without thinking, let her left breast drop. The resulting SLAM caused one of the more flimsy makeshift lab tables to collapse, spilling various liquids onto the floor. Emily appeared startled by the noise and vibrations, but didn't seem upset by the mess - apparently those weren't vital to her plans. Or perhaps her new intellect made it childs' play to duplicate.

"Apologizes. To summarize, what we've created here is basically a type of organic nanobot. Controllable cells that can alter other cells, making almost anything into anything else, and in the case of you ladies, it will make some things as big as you'd like. And the best part? You can reverse the process at any time!"

"What?!" Kara yelled. "Why would we want to reverse it?"

"I think I know," I said, interrupting. "It's so you two can grow without worrying about consequences." The possibilities were staggering.

Tara suddenly spoke up. "And of course, dear sis... so that we can do it all over again whenever we want."

Kara squealed loudly. "Then, like, what are we WAITING for?!" Emily handed a vial to each sister and they drank it without hesitation. There was complete silence afterwards, and you could cut the tension with a knife. When would the changes kick in?

Each second felt like hours, but I suddenly felt something push against my back. I spun around and was face-to-face with one of Kara's breasts... and it was visibly growing. I scrambled back a few steps but the breast caught up to me in no time. I moved back farther, until I bumped into something else: one of Tara's giant thighs... which was also growing larger. I looked up at Tara and she gave me an almost sinister grin and she was slowly raising higher due to her enlarging ass.

As much as I wanted to be a part of the experience, I dashed towards the kitchen to get a better view, and Emily followed me. She looked both fascinated and thrilled, but not in the same way that I did. The view was nothing short of awe-inspiring. The twins were screaming with joy and overwhelming pleasure as each girl's breasts and ass grew larger and larger.

The first victim to the overwhelming expansion was the lab equipment near Tara. Tables began to get pushed by her rapidly growing booty before getting completely knocked over. Computers and monitors crashed to the floor before disappearing out of site... whether they were just being pushed away or got caught underneath hundreds of pounds of butt flesh, I'll never know. 

One of Kara's breasts was pressing into the couch and started to be slowly pushed away with her expansion. Grinning madly, Kara hefted her tits to the opposite side, then swung them back towards the couch with loud WHAP, knocking the couch almost all the way to the kitchen and onto its side. Inspired, Kara did her best to move around the living room, looking for more furniture to hit or destroy. The increasing weight of her impossible bosom seemed to start finally becoming a bit of a problem even for the super-strong young woman, but she tried to move around as much as she could.

A symphony of crashing noises drew my attention back towards Tara, who hadn't moved an inch, but her overwhelming ass had now begun to knock over more desks and tables with glass lab equipment... including vials of chemicals. I saw some kind of smoke or steam coming from some of the spilled chemicals and turned to Emily with concern. "Are those dangerous?"

She chuckled. "To us? Yes. To these girls? Absolutely not."

"What about all your research?"

"All up here," Emily said, pointing to her head. "But I've also got backups, just in case." She showed me a USB flash drive before putting it back into her pocket. "Just enjoy the ride."

It was barely minutes later when Kara's breasts - now at least ten feet in diameter - began to reach Tara. "Oh god, yes," Tara moaned, holding her hands out in anticipation. Her own breasts were now over four feet in diameter each... their "secondary" parts seemed to be growing at an even faster rate than usual. A loud THUMP revealed that Tara's ass had now reached the wall behind her and was filling in as much empty space as it could. Kara's tits first pressed into Tara's impressive pair, eliciting moans from both sisters, and then the flesh continued moving towards the rest of Tara's body. Tara hugged as much as she could while the flesh continued expanding, sandwiching Tara's upper body between Kara's boobs and Tara's ass. Moments later, I couldn't see or hear any part of Tara, except for her butt.

Kara's ass, meanwhile, had grown so much that it had reached the floor and was getting close to being taller than her head. I could tell that, before long, she would be sandwiched between her own breasts and ass. If this living room hadn't had a two-story high ceiling, it would have been destroyed by this point, easily. Kara's breasts were well over sixteen feet tall and still growing. The sisters' expanding flesh was approaching me and Emily at what should have been an alarming rate, but we were too interested in watching it all happen to think about things like "safety".

Once the flesh reached the lower ceiling of the kitchen and we started hearing cracking noises, I began to think that it was time to move out of the way. I backed up, slowly at first, still entranced by the flesh that was squeezing into the kitchen. I could feel the warmth even without touching it, and I raised my shaking hand, anxious for the skin to reach me, until the creaking and cracking sounds began to get louder and come from multiple places. I turned and dashed to the hallway, but realized that Emily wasn't with me. Whipping my head back to the kitchen, I saw Emily being pinned between the growing flesh - I'm pretty sure it was one of Kara's breasts - and the kitchen's island, shouting "YES! It WORKED!". I grabbed her hand and pulled hard. If not for my enhanced strength, I'm sure I wouldn't have been able to free her. Fortunately, I succeeded and lifted her over my shoulder and ran out of the kitchen.

Before we even reached the front door, the cracks became loud smashing noises and the house began to shake and tremble. At the end of the hallway, I could see Kara's ass breaking through the living room wall and start demolishing the staircase. I shook my head to avoid being entranced by the amazing sight and I, with Emily in tow, ran out of the house.

I moved us far back enough to avoid being hit by a falling wall or flying debris. From that distance, I could easily see that Tara's ass had already burst through a wall and was still growing. It was hard to see into the kitchen windows due to the sun's glare, but I could just make out the mass of flesh pushing a broken kitchen island in our direction. Emily and I both watched intently as it got closer to the window and then with a CRASH, the glass broke. Moments later, the rest of the wall started cracking and splintering as breast flesh flowed through every possible opening.

Almost a minute passed with almost no visible activity. We could hear muffled noises from the house, but I wondered if the growth was slowing down. I turned my head to Emily and opened my mouth to ask her a question, but I was cut off by increasingly loud noises. I focused my attention back on the house just in time to see it practically explode from within. Glass shattered, wood cracked, and pieces of wall and former furniture BURST out as the remains of the walls shattered and fell to the ground, revealing massive mountains of flesh that were now free to reach beyond the former limits of the large house. By now, it seemed that the growth had stopped.

"Holy SHIT," I breathed.

"These girls are godsends. Thanks to them, I'm a genius! And soon to be a RICH genius," Emily laughed.

Suddenly, reality hit me, and hard. "Uh," I said, trying desperately not to sound like a complete idiot. "Nnnnow what are we going to do? Um, like, where will we live?"

Emily gave me an insufferable genius smile. "You know how the twins have quite a lot of money, right?" I nodded. "Turns out that Tara has been using her brains for more than just T&A: she's been making brilliant investments for years now. They're LOADED. While we were working on the project, Tara and I set out to purchase all of the nearby land for a few miles around. Everything beyond that in a couple of directions is the State Park. We're well and truly isolated at the moment."

"But... what about..."

"Take a look on the other side of the heaving mass of twins," Emily sighed. I tried, but couldn't. The girls looked so damn sexy. Emily grabbed my chin and lifted it. It looked like there was some kind of massive aircraft hangar not far from the house. I had never noticed that before, and I was pretty sure it didn't EXIST before. I asked Emily what was going on.

"We also took the liberty of designing an appropriate living facility. Once the girls get out of their orgasmic stupors, I'm sure they'll have no trouble heaving themselves over there, where it will be simple enough for you to take excellent care of them."

"How the hell did that get built right over there without me and Kara noticing?!"

Emily rolled her eyes. "You and Kara were EXTREMELY noisy."

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

Well, that basically brings us to the present day. The twins did have to struggle to reach the "hangar" (which is what we started calling it), but were very pleased with it from the inside. The floor is solid concrete with a very thick layer of padding to keep the girls comfortable. Each wall has a projector screen so that they can watch movies or even play video games while facing any direction. There's a lot of long hoses installed in hatches all over the floor so that I can wash off any part of the girls' immensity with ease. There's even a large room in the back just for me, in case I ever need some time to myself so I can relax. I should probably check it out one of these days, before we move.

Ah, that's right, the move. As it turns out, the girls aren't quite done growing. After the house-destroying burst, the twins went back to their "slower" rate of growth, which was still increasing in speed as they increased in size. I've had a replacement hangar built nearby that's the same size as the ones that are used for the largest aircraft in the world, for when they inevitably need it.

Part of me hopes that they'll decide to reverse the growth eventually so that I can share some more intimate moments with them, like "regular" people. "Ooh, we can visit a water park," Kara recently said.

"I've been checking out some new fashions on my tablet," Tara mentioned the other day. "I really want to grow OUT of them!"

Despite their excitement, the twins keep putting off the reversal. Now that they're getting closer and closer to completely filling up the hangar, they're focused on destroying it, and this has been making them hornier than ever. They've ordered me to stick my new twelve inch cock into any cleavage, ass or breast, anytime I'm capable of doing so. Now that the twins are THIS big, I can't even tell at a glance which ass or pair of breasts belongs to which girl. Not that it matters anymore. Same difference, really.