She lived in the testing chamber; it was her home. She was the best so far in a series of genetic experiments. The scientists wanted to create the ultimate in sex appeal, but without the risk of disease. At least, that was what they were told by their superior, Dr. Dorein Setar.

They had gotten the no-disease part down easy; it was accomplished in the first four experiments. Creating genetically perfect humans from scratch was hard, but they had funding and enough computers and science teams to accomplish it. Each specimen had knowledge of pleasure and ways to induce it in others imprinted into its brain as it grew. The part was getting it to want to pleasure others, and no amount of training, genetic manipulation, propaganda, or brainwashing could get them around it. So they kept trying new things, hoping something would turn their way.

Most of the scientists at the facility were men; some were women. Most of the scientists overall were older, but Mary, a younger scientist, had an absolute knockout figure. Dr. Setar, the man who had gotten the funding and had started the project, had brought Mary in for two reasons: she had an excellent figure, and she was SMART. Her brains were too valuable to be wasted somewhere out on an exotic dancer stage, so he brought her here.

She had helped pioneer many of the breakthroughs that had been made, and had even come up with a good portion of the genetic code used to shape the test subjects’ bodies, mostly their upper body. She had especially helped to shape the breasts on the bodies of the test subjects, each new subject having slightly larger assets than her successor.

This latest subject, #81, had been given a different treatment, as an experiment. She had been given a few extra genes that had given her breasts the ability to produce milk, which they had been doing ever since she had hit puberty (the growth span for these subjects was short, only a few days, and they handled the speedy aging wonderfully, slowing down and almost stopping at the physical age of 21, despite only being four days old chronologically), but within her genetic and cellular structure, the genes and cells and biological commands within the body that told what cells to make her reproductive organs had been removed. Her body simply lacked the ability to procreate, and as a result, there was nothing between her legs. No pubic hair, no pussy, no nothing. This had caused a hormone imbalance within the subject, resulting in her overlarge breasts, but they would work around that later.

The subject, named ‘Sarah’, had shown an especially high level of intelligence, and also expressed interest in others, more social and more personal than any of her predecessors. Once she had hit puberty, however, contact was limited to a man in a sterile environment suit that brought her meals. She had needed no medication, another plus that the others had not had, and she had shown increasing amounts of sexual need.

Today, the scientists were planning on exposing her to a man, to see what her reaction would be. The door at the end of the containment chamber opened, and two men in environment suits walked in, went to opposite sides of the chamber, and sat down in chairs. The bed in the center of the room was the one they had left there for her to sleep on, and now they would see if she decided to bring a man there with her. Sarah ignored the environment suits. She had never seen anyone put one on, and she assumed they were a different kind of human, like herself.

She wore clothes and had a decent wardrobe, and the containment chamber was her home— the only place she had ever known. She had all the furnishings one would want: a shower, a small kitchenette, a TV, and exercise machines. She was well built and looked at the man who walked in with the environment-suited scientists. She regarded him with some interest, like a child does a new toy, but not one they are particularly interested in, and sort of gazed at him for a moment before going back to eating her lunch and watching a bit of TV. She enjoyed keeping fit and had done an admirable job of doing so, even though her genes were made to keep her thin, beautiful, and desirable.

The man made numerous advances, and she brushed them off, not really caring. After a while, she yawned and headed for her bed, and when the man tried to climb in with her, she glared and told him to get out.

Mary was watching all this on the TV screen embedded in her desk and could barely make out who was who on the tiny, cheap, black-and-white screen. She suddenly had a flash of insight and quickly ran to see Dr. Setar.

“Yes, Mary, what is it? You make another breakthrough? I’d like to say that what you’ve done here—” he tapped the monitor screen where Sarah and the just-turned-down man were “-is good, but we still need to get her to want to pleasure others.”

“I know, I’ve had an idea. All the coding we’ve done so far has been exclusively on making her desirable. What if she doesn’t want men but a mirror image of herself? You’ve seen how she poses in front of her mirror at times, sometimes for hours.”

“What do you propose, Mary?” Dr. Setar asked. Mary took a deep breath.

“Send me in, in place of the man we just tried. I modeled her closely after myself; maybe she will fall for me, maybe see me as someone who is like her. What if she falls for women instead of men? You said yourself that if this works, we can do all sorts of things with this, including sell copies of the best ones to men for pleasure. There are god knows how many, lesbians out there who have no partners because they’re afraid. What if we provide an answer, for a price? It’s worth a shot, sir.” Dr. Setar looked at Mary for a moment, as if reevaluating her.

“And no one else on the entire staff here has considered that? Mary, you amaze me every time you walk in here. Get down there and see if your little theory works. If it does, you’re promoted. If not, we keep looking. I don’t want to lose someone with your genius, Mary. God help us if someone else does.” Dr. Setar smiled at her and turned back to his work.

Mary went back to her desk and sent a quick message to the people monitoring Sarah, telling them to notify her the moment Sarah woke up. Mary went back to work, and two hours later, the intercom at her desk beeped with a message from the monitor room: Sarah was up and getting dressed.

Mary got up and walked as slowly as her feet would let her, which was just slower than a run, like a fast walk. She realized that she would be the one to hopefully get the program to open up; then she could branch out with her own side-project, heading it herself. It felt like a dream, and she wasn’t sure it would come true. She walked into the test chamber and gaped.

Sarah was beautiful, all right, and breathtaking. Mary had the body of a supermodel, but Sarah made her look ugly and downright repulsive by comparison.

Sarah was wearing a white button-down T-shirt and her usual jeans. The jeans were kind of baggy, but the shirt was skintight, shaping Sarah’s breasts. Sarah smiled broadly and yet also seductively at Mary, walking over, her tiny nipples barely able to poke through the thin, tight shirt. Gaps between the buttons were easily noticeable, each gap exposing a small amount of creamy white flesh.

Damp spots around her nipples showed she was still producing milk and clearly had a great deal of it within her breasts. She was muscular, but not visibly so. White, silvery-white hair, done up in a long ponytail. She was slender, but not overly thin. Her breasts were very prominent, filling and almost overflowing the shirt she wore. This was the first time Mary had ever really laid eyes on Sarah and hadn’t paid much attention to her body, besides the TINY video screen at her desk couldn’t show her anything, a cheap TV rigged to receive images from the test chamber. She hadn’t realized how BUSTY Sarah was, not till she met her in person.

Sarah smiled, her voice mature and calm, but there were overtones of childishness and playfulness, as well as a few hints at sexuality. “Hello. Who are you? I haven’t met you before.” Mary smiled some.

“I’m Mary, I’m a scientist here. You look beautiful, Sarah, did you know that?” Sarah smiled, and the almost physical aura of pure sex that surrounded her almost doubled with that comment. Mary was attracted to her the moment she had created her, but now that she met her creation in person, she was hooked. Sarah took a few steps forwards, breathing shallowly, as if a deep breath would burst her shirt open, freeing those huge breasts. Mary hoped she would be able to see them before the night was over. Sarah’s shirt made creaking, groaning noises, protesting the incredible strain it was put under by Sarah’s breasts. Sarah gently stroked and rubbed the sides of her beach ball-sized breasts, smiling seductively at Mary.

“Mary, you look sexy, you know. Did you dress up to see me? I’ve heard some about a lady named Mary; those plastic suit people talk about her sometimes, and how she designed me. Are you her?” Mary gaped and blushed at Sarah’s comment.

“Actually, yeah. I didn’t know you’ve been told about that.” Mary said, a scant second before Sarah took one last step forward and rested her hands on Mary’s breasts, which were a bit bigger than basketballs, but not much, the touch sending a shiver up Mary’s back and a moan from her lips. The door was closed, and with a quick push of a button on her remote, the lab cameras shut off. They were alone.

“Sarah, do you desire me?” Mary couldn’t help it, and it felt almost natural now.

“Yes, Mary, I do. I want to know if you’re as good as I am.” Sarah grinned devilishly. “I have good hands.” With that comment, Sarah began to undo the buttons on Mary’s shirt, freeing her bra-clad basketball-sized breasts. Sarah guided Mary to the bed and lay down with her. “You really are beautiful, Mary...”

As she finished that statement, her lips met Mary’s in a kiss, and Mary’s mind was overwhelmed with pleasure. After the kiss, Sarah stood, murmuring softly to herself, her hands rubbing the sides of her massive breasts, smiling at Mary, who was given a front-row seat to the work of art she had created when designing Sarah’s body.

Sarah’s breasts were round and full and firm, and held their shape excellently. They were obviously heavy, any breasts that large had to be, but Mary had worked around the problem by giving Sarah an especially sturdy spine, making her able to walk with some small amount of ease despite her large, milk-filled assets. Perfect in every way.

She smiled dazzlingly at Mary and took a step forward, putting those huge beach ball-shaped tits right in Mary’s face, her mind freeing itself from the mental conditioning it had been given every day since she had been ‘born’.

“Do you like what you have wrought, Mary? Do you see the beauty you have made?” Mary gaped in awe, and hesitantly reached out to touch one of Sarah’s massive breasts, damp spots visible on her shirt where her nipples tried in a futile attempt to poke out through the thin fabric of her shirt.

“I have Sarah, and I’m amazed. You are incredible.” Mary touched one finger to Sarah’s breast, gently rubbing it, and the reaction was instantaneous. Sarah let loose a long moan of pleasure, her eyes closed, her back arched instinctively from the sensation. Sarah’s hands reached out, unclasping Mary’s bra, and then they both fell into bed, and the lights went out, the room lit by the soft, ever-increasing white-blue glow that surrounded Sarah’s body, only visible at times when her hormones were running rampant.

Dr. Setar had reactivated the lab cameras a few minutes after Mary had disabled them, and he watched as the two women shared a long, intimate night with one another, a smile across his face. Mary really was a genetics expert, and what she had done with Sarah was almost a strenuous environment test (exactly what he had wanted), though she hadn’t known it. Sarah needed her body altered to handle the extra weight of her breasts, and Mary had given her a stronger back and legs, and had come up with a perfect human being, without those breasts to weigh Sarah down, and different mental conditioning, who knows how Sarah could perform as a soldier.

He smirked, as he activated his intercom and called the cosmetic surgeon they had at the research base. Sarah would be very different in a few days. And think of all the real women who would be happy from this, breast enhancement without surgery. A small genetic alteration, and Voila! Instant breasts! They could increase metabolism and give women a fat-free body, except where it would be needed. Or give men the ultimate body they liked.

He smiled to himself again. That thing down in the test chamber wasn’t really human; it hadn’t been born as a real one should. Besides, the fact that it had something that was decidedly NOT human in its genetic code meant there was all the more reason to eliminate it. It wouldn’t matter if it was eliminated. If it wasn’t human, then killing it wasn’t murder.

Mary awoke with a start the next morning. Sarah was standing over her, looking upset and concerned. She was dressed, and Mary was as well, somehow. Was last night all a dream? If so, how did she end up in the test room with Sarah?

“It wasn’t a dream, Mary.” She said in a soft voice. Mary smiled a little.

“When did you become a mind reader, Sarah?” Mary asked, a little jokingly. Sarah took the question seriously.

“Last night, while we were ... you know. It happened suddenly, I don’t know how or why, but it scares me. The head scientists, the man who is your boss ... he’s going to have a surgeon remove these.” She patted her breasts. “Then he’s going to do some kind of new mental conditioning, so I can ... fight?” She said the word hesitantly, as if the concept was alien, or at least not something she liked the thought of, despite all the episodes of Sailor Moon, Tenchi Muyo, Escaflowne, MS Nadesico she had watched, cheering on the dramatic fight scenes every step of the way. “Then he’s going to eliminate me. Mary, I don’t know what to do. I’m scared, and I don’t like him. I don’t want to meet him, but he watched us last night, he’s going to come down and take you away ... and then he’s going to have me ... killed...” She sobbed, clinging to Mary like a lost child.

“Sarah, hey, whoa ... you can read minds? You can hear what I think?” Sarah nodded slowly.

“It comes and goes, and it’s not clear on some people. Their minds are all fuzzy, like bad TV reception. Mary, I don’t want to die ... don’t I deserve to live, too? Am I human, like you?” Sarah deliberately left out the bit of info about the non-human DNA in her genes, thinking that Mary would say ‘no’ if she found out. Mary’s response was instantaneous.