Finally, humanity was on the moon to stay. It had taken a while - for ages, scientists had considered the moon a dead rock, and given up on ever creating a worthwhile colony there. And they had been mostly right. There was little scientific value in the moon; ice in the craters had never panned out, and it was devoid of minerals of any value. There was one saving grace, however.

Health spas.

The moon was inhabited by tourists. Hundreds at a time would visit the lunar surface, bounding over the pockmarked grey wasteland in super golf carts, kicking up dust and creating havoc with the filtration systems the domes ran. There were vacation domes, forested domes, golfing domes, amusement park domes, administrative domes, and a large, centrally located station dome, the gateway to the planets.

One small dome in particular caught Jenny's eye when she was planning her trip to the moon. She was a semi-wealthy futures analyst based in Neo York, built after New York was flooded when the ice caps lost 50% of their mass. She read about the new dome's unique features - a complete salon and beauty shop, unlimited body modification, and a large grassy open area for 'frolicking', as the brochure so politely stated. Jenny pondered the price tag. It would require some penny pinching to pull off, but...

She dialed her travel agent.

Spaceflight was nothing new to Jenny - after all, she had to take a trip to mainland China every few weeks to meet with her bosses, and low-earth-orbit was more efficient for that then airplanes. She still disliked it, however. The initial thrust reminded her unpleasantly of a past boyfriend who called himself 'rocketman' when they had sex. He had been a good lay, all right - but also a total jerk the rest of the time.

"30 minutes until lunar orbit is entered. Please begin returning to your seats in preparation for a return to gravatic influence." Jenny sighed. She enjoyed zero gee, because she was able to achieve that dream of millions of models and housewives from ages previous - guilt-free weight loss. That, and her small chest felt much more full when she could feel her breasts bounce against her upper body.

Lunar insertion and disembarkation was simplistic; passengers began exiting into pods as the ship passed over their dome of choice. The reNEWal dome, as her destination called itself, was on the far side of the moon, an area with cheaper real estate but that looked only into the inky darkness of space. The area could unnerve weak-willed workers, who had to exist without any direct visual contact with the Earth for months and years at a time.

"ReNEWal Dome, code HT673PEM8, now in drop radius. Passengers bound for reNEWal Dome, code HT673PEM8, please disembark now."

Jenny lounged in the pool and stared at the amazing roof. The dome was entirely an open field, save for people's individual quarters and a few administrative buildings, with an amazing holographic ceiling. She watched a flock of birds fly over and sighed wonderfully. "This is some vacation." she murmured sleepily. She's been there for two days and was already incredibly relaxed. Her hair, originally a short, simple, dark brown, was now a collection of long, flowing, vibrant red curls that framed her face like a halo. She had her nails done, a classical medium-length apple-green that she had fallen in love with. She had already had her pores cleaned with a special technology called 'de-resist-negation-dirt-removal process'. She didn't know how it worked, but she felt great!

She shifted back towards the world of the awake as she heard a splash in her pool. A tall blond with the largest rack Jenny had ever seen was climbing into the heated pool. She noticed Jenny and waved energetically, setting her chest into a torrent of motion that continued long after she had stopped. Jenny returned it feebly. She though that perhaps the woman was named Marcy.

Marcy floated over, oblivious to Jenny's noncommittal responses. "Well? Do you like 'em?" She bubbled.

Jenny considered for a moment, then asked: "Like what?"

Marcy looked confused. "My breasts, silly! You were encouraging me to have them expanded last night, don't you remember? So I did! These are G cups, if you can believe it."

A flare-up of envy, quickly suppressed. "I don't remember that at all. I was a little smashed last night, to say the truth."

Marcy shrugged. "So was I, I guess." Then Jenny saw her eye Jenny's chest.

She went nuts. "What! You think that my breasts are small, huh? You big-titted freak, who are you to judge ME! I think you're disgusting. A selfish pig, that's what you are. Terrible." She lifted herself out of the pool with one arm. "Fuck off, girl. Seriously, I don't need to take crap from a freak like you." She stormed off towards her room, leaving Marcy slightly bewildered.

She had been going to complement Jenny's natural size.

Jenny slept fitfully that night. Her dreams always seemed to end with her getting crushed by a pair of huge tits, while a woman (Marcy?) laughed from behind them. The breasts were so beautiful, Jenny thought idly, as they crushed her again.

Then she awoke. "No! Breasts that big are STUPID! They just get in the way. They make your back hurt. They..." She paused. On the moon, they wouldn't make her back hurt. "No! Why am I even considering this! I don't want huge boobs, mine are just fine they way they are." She wondered why she was convincing herself of this.

She moved to the window, her steps light in the low lunar gravity. Her room looked out onto two vistas: the rolling, artificial hills of the dome, and the rocky, cratered surface of the moon. Which was better?

Jenny bumped into Marcy again in the restaurant; rather, she bumped into her boobs. In the relaxed, all-female dome, Marcy had taken to walking around naked whenever possible. The few lesbians in the resort had been easily identified after she started this; one had openly orgasmed the first time Marcy had passed through her line of sight. Jenny looked at her chest. Was she even bigger now than yesterday?

"Oh, hello Jenny! How was your night?"

Jenny gave a start. She'd been terrible to this woman yesterday. "Look, I'm sorry about my outburst yesterday, I was tired, I didn't think-"

"Don't worry about it. I've been told much worse already this morning. But how'd you sleep?"

Jenny grimaced.

Marcy looked sympathetic. "Oh, I know how you feel. I didn't sleep a wink at all!" She gestured at her breasts. "The auto-doc wasn't kidding when it mentioned that they might expand further in the low gravity. I think I've gained at least a few inches around!"

Jenny couldn't hold back. "What's that make you, a I-cup?"

Marcy pondered for a moment. "An K-cup, I think. Eleven inches of cleavage, or something. Isn't it amazing?" She giggled like a schoolgirl, massaging her right breast with her hand. The nipple looked small on it, as if it had been simply forgotten with all the swelling the rest of her had been doing. Marcy rolled it in her fingers, visibly turning herself on. Jenny made to escape from having to watch the building orgasm, but Marcy stopped her. "Please...rub the other one...I need it so badly..."

Jenny cast her eyes around for one of the lesbians, but none were visible. She reached out tenatively and squished it into Marcy's body; her reward was increased moaning from Marcy.

So soft, she thought. Amazing. Like pillows, or marshmallows, perhaps. Jenny entertained the idea of getting breasts this big for a moment, then quickly threw out the idea as silly. She had fine breasts!

Marcy trembled like a leaf in Jenny's arms as she continued her ministrations. She was dripping wet in her crotch now, seconds from climax. Jenny reached down and touched her pussy, driving Marcy into a fit. She spasmed as pleasure raced up and down her nerves, obliterating almost all thoughts.

She kissed Jenny.

Jenny sat in her room. That had been...awkward. Jenny wasn't a lesbian, but it seemed that Marcy was bi; she was married to a man on earth but had been banging the lesbians on the moon. After the kiss, Marcy had apologized profusely for her conduct; it was so rude to kiss a woman without her knowledge or and warning.

And yet, Jenny hadn't minded all that much. She's felt Marcy's breasts clasped tight against her skin. She looked at her small breasts, and resolved to make them bigger.

In the morning, she'd go to the auto-doc and request bigger breasts. But how big? E-cup? F-cup? Or even J-cup? She'd sleep on it.

Her dreams were odd.

She stood at the wall of the dome, but there was no wall, just the moon and the hills, and she stood on the threshold, one foot on the lunar surface, the other on grass; and then Marcy walked by, with breasts that were as big as the dome, then the moon, then the earth, then the sun, the all Jenny could see was breasts, then she was sitting on top of them, and Marcy was there with her; they both sat on the breasts, each sitting on one of them and talking, about Marcy's husband and the lesbians and sex and jobs and the hills and the moon and microgravity and where Marcy had found her eyes; they were ravishing yellow and Marcy said that she was born with them and Jenny doubts her and Marcy pops one out and shows it to her; sure enough, it's real, and the breasts grow and smother Marcy and Jenny screams and the breasts smother her.

Jenny woke up. "Woah."

Jenny went to the auto-doc after breakfast with Marcy, who had grown another cup size during the night; she was now a L-cup, the biggest either of them could think of. Jenny had an idea, however, born from the strong coffee: I'll get breasts that will be the same size as hers. We'll be the world's largest women together.

The auto-doc was amazed by the request. "L-cups? Sure, but-"

"Just give me the implants, please. No lectures."

She stood in a small booth, and the auto-doc chirped once. There was a flash, and there was an odd sensation in Jenny's chest. She watched as mass moved into her chest, growing it from her modest size to, say, a F-cup, where it paused for a moment. "You're sure about the L-cups?"

"Didn't I tell you not to lecture?"

The flash again, and more growth. She felt her bra, a measly C-cup she'd borrowed, stretch under the strain of her breasts. At 7 inches of cleavage, the bra failed miserably. It fell out the bottom of her shirt, letting her breasts hang loose. They were stretching her shirt something fierce; her tits now hung 10 inches in front of her, and were about to bust right out of the shirt. Her J-cups, perhaps equivalent to enormous pears or elongated apples, tore a hole right in the middle of her chest. "Whoops." She giggled. The sensation was incredible, as the tearing fabric drew over her breasts, the threads tickling every nerve ending she had.

She finally reached 12 inches of depth; her chest measurement must have been well in the high 40s, perhaps breaking the 50-inches-around mark. She realized that they must weigh over 20 pounds; even the moon's light gravity couldn't relieve the sudden extra weight. She walked out of the booth a little shaken; it was such a change! She had boobs! Enormous ones! Bigger that Marcy? Maybe!

She went to Marcy waiting at the table. Marcy leapt up, her boobs bouncing wildly. "What did you do!?"

Jenny spun in place, letting her boobs wobble out of her shirt. "Like them? I thought I'd join you."

"That's not it! Boobs grow in microgravity! Mine over doubled in size after the procedure, remember?"

Jenny blanched. She'd forgotten completely about the side affects.

Jenny lay in her bed, moaning. It was late at night now, and she couldn't sleep at all. Her breasts were growing steadily, constantly, methodically. She was already up to 5 feet around at the widest natural point, and still going steady. She couldn't lie down, since they might smother her while she slept, and she couldn't stand, since even in the low gravity envronment they were much too heavy.

Another orgasm.

Her vagina was raw from all the use, but her growth was just too much. She was sitting upright, leaning on her breasts and reaching under them to masturbate. Marcy was working with the staff to get her onto a shuttle into space before she crushed herself under her own weight. The dome didn't have the equipment to handle the massive mamms, and neither did anybody else on the moon. They had to get her to space before she grew too big to move.

Another orgasm.

Jenny didn't really care at this point. Her mind had been wiped away for the time being by the sensations that her growing boobs sent to her. She worked her clit now for a change, twisting and rubbing it. One finger dipped onto her snatch. Her other hand was constantly running over her breasts, feeling every little space.

Another orgasm.

They brought the biggest shuttle they could for the trip. Jenny was wheeled onto it, with Marcy watching worriedly. Marcy had finished growing at a X-cup, over four times her original request. Her breasts hung almost 26 inches off her front, with a cleavage canyon that grew even more impressive when she put on her bra, specially made to keep her from falling over.

Jenny was past any cup size. Her constant masturbation was driving her hormone levels through the roof, causing her growth to be even more drastic than Marcy's. She was 110 inches around, with each breast with a greater average circumference than Jenny's height. Still masturbating, she lay on her tits, face down.

The shuttle launched towards the space station Firebird. It was the largest of any man-made space object, with dozens of football-field sized rooms. There was a team of doctors at the ready, going to attempt a surgery as soon as she stopped growing and regained sanity.

Jenny ended up floating in room B-3 for a month, masturbating the entire time. Her breasts grew all the time, slowing after a few days but not stopping for the duration of the month.

After she reached a ten-foot-deep cleavage measurement, the boss came to see her. He watched as she floated and grew, thanking God that she hadn't asked for anything larger.

Her boobs gained a wonderful, spherical quality as she grew. They were massive bodies, like planets, and Jenny was only a tiny speck against them, the only object keeping them together.

As the growth slowed down, she began to attempt to have sex with the scientists. If someone came close to her now incredibl well developed and muscular pussy, she would motion that someone should insert into her. No one was brave enough to challenge the powerful organ until a hotshot transfer with a massive cock and insatiable sexual appetite arrived. He managed to have sex with half the department in one day, and ended up jerking off to finally reach orgasm. When Jenny motioned to him, he couldn't pass up.

They fucked for hours, her screams of pleasure reverberating throughout the station. She outlasted him, however; he collapsed after his eightieth orgasm, and she still had energy to burn. She fingered herself for hours after that.

Finally, she stopped. She stopped growing, she stopped masturbating, she stopped altogether; and took a nap. Jenny slept for a while, and the doctors began to examine her. Plastic surgery specialists from around the solar system looked at her and shook their heads. There was no way, in their opinion, to salvage her breasts if she wanted them removed. If she elected for surgery, she would be flat all her life.

"Jenny? How're you feeling?"

Jenny blinked awake. "Uh, fine, I guess." She touched her breasts carefully. "It wasn't a dream, was it?

The doctor smiled warmly, attempting to put her at ease. "No, unfortunately not. Now there're a few options at this point, so-"

"Can I keep them?" Jenny hugged the small amount of breast she could reach. "I love them!"

The doctor was taken aback. "Well, I guess you can, but-"

"Yipee!"

Jenny now lives in her own private space station, tended to by robots and her good friend Marcy. She survives on the worship and adulation of those who either want enormous breasts, love enormous breasts, or have large breasts. She was a religion unto herself to some people. She still is growing, just around an inch a year or so. Marcy and Jenny have wild, passionate sex nightly, however, and Jenny'll never give that up.