The Scientific Experiment

“Just step in here, and the trial will begin.” muttered the woman with the clipboard, her eyes peering through the slender frames to the long words on the page. She didn’t even look back up at Madison as she turned and closed the door back on her. With a click, she was left in total darkness.

This was her first time running a clinical trial. She wanted to do her part to help the scientific community of course, but all she was really interested in was the hundred bucks they’d promised for its completion. She really needed that money.

For a moment there was silence - almost silence, she could have sworn she heard sniffing coming from the other side of the room, broken seconds after by a burgeoning electrical hum from a tubular fluorescent bulb overhead that quickly ruptured into light.

Tables, metal trays, a computer and a chair… and a woman on the other side of the room dressed in the same baby blue hospital gown that she wore herself. She stood hunched over, her nostrils flared, with her unblinking blue eyes fixated on Madison. Her hands were reaching outright like she’d been shuffling through the darkness, trying to find her way. The robe hung off her like a curtain around her small frame, her blonde hair twinkling as it draped across her front.

“You must be here for the trial too?” Madison spat, concern growing in her at the sight of the woman. Would they do to her what they’d done to this poor girl? What exactly had they done to her anyway?

Before she had chance to follow the threads of her thoughts, she girl started to advance upon her. She made long, quick strides and spanned the room in barely any time at all. As she started, Madison lost her nerve and spun around to grasp the door handle, turning and rattling, checking all the while over her shoulder as she advanced.

“I need to fuck, I need to fuck!” the girl hissed as she got closer, her outstretched arms reaching out for Madison. As a groping hand met her shoulder, Madison swung her arms to keep her at bay.

“Get off me!” She demanded. “Help! Someone help!”

The hands kept coming, reaching at her waist and ample breasts. For a moment she managed to shove the blonde girl back a few steps, but in a glance she noticed something different about how the fabric fell. There was something between her legs - something large.

“Take it off!” She wailed as she approached again. As she walked upright that protuberance stood firm, tenting out the loose fabric at her groin. “No! Stay away!”

Hands flew as Madison tried to get control of the situation, backing herself up against the door. She didn’t notice exactly what happened, but the girl managed to get a grip of the gown and rip it clean from her body. Her natural instinct was to try to cover herself, and in that moment the girl found her chance. She lunged forwards, biting down hard on Madison’s neck and pushing her to the side across a desk. In one smooth motion she wound Madison’s hair around her wrist, taking full control of her as she slid her body behind.

“Get off me!” She screamed, trying to kick at the attacker pushing her down against the table.

“I’m going to breed this.” She declared, slapping Madison’s tight ass. Already, she could feel a huge cock pressing against the back of her thighs, moving, aiming, probing. She grasped at what she could from the desk and tried to swing it back but her efforts were futile. Her show of resistance only forced the girl’s hand more, tightening her grip on Madison’s hair and pushing her deeper against the table, spreading her breasts against the plastic top.

She could feel the other girl’s tits against her back, smaller than her own but more than ample. But she wasn’t a lesbian, no, she was married - this wasn’t right at all. She didn’t even have time to wonder how the girl managed to get a cock - a monster, mammoth cock at that, that now found its way to her slit.

“There it is.” The girl sizzled happily in her ear as she began to prod against her. Madison tried to move her hips away but was held firmly in place by the girl atop her.

Madison screamed as the girl forced her way inside thrust by thrust, pressing open her walls as her girth jammed its way inside. Without lubrication it was sore, but this girl wasn’t here to make Maidson feel good - she was there to fuck, to breed like an animal in heat.

“I’m going to breed this pussy; you’re going to have my babies.” She continued in her ear as Madison moaned loudly.

The sound of the girl’s hips smashing against Madison’s ass echoed around the room with an ever increasing pace, never stopping. She panted, and thinking she was beginning to tire out Madison took her chance and slid away from the table. She fell to the floor and rolled to her back to find the girl already approaching, practically pouncing atop her. In that split second she caught a glimpse of that throbbing, veiny cock, glistening in the lab’s light with her juices.

In a flash Madison found her legs up around her shoulders and the girl’s hands clamped around her wrists, those blue eyes flashing with a maddened fervour and a wry grin about her face as she slammed back inside. She could feel every bulging vein against her insides as the girl’s tip bruised her cervix.

“This pussy is mine.”

Madison’s body grew wetter to minimize the damage done by the monstrosity breaking her open, filling every space inside her, and she gasped and panted at the sensation of it all. Up and down her tits bounced as the girl went in and out, using and abusing her and enjoying every second.

Beads of sweat began to appear on her brow, her pace never breaking even for a moment. It was a relentless onslaught of cock, the likes of which her body had never known. She never got anything like this at home.

As the initial pain subsided, she found pleasure hidden within its darkness. Being filled so completely, controlled and submitting to this beastly girl made her wetter. Laying back and letting it happen was all she could do anyway - she may as well try to eke out what enjoyment she could. The air was now thick and heavy with the unmistakable smell of sex, filled with moaning and grunting, demands of breeding, with the occasional scream of pleasure and pain calling out.

After what had felt timeless, like a fleeting moment and yet an eternity at the same time, the girl above her began to judder and tremble. She was close.

Madison knew the only way to finish this was to help. She clenched her insides as best she could, though with them filled so completely it barely made any movement. The added pressure on the girl’s huge cock made her groan out like a wild animal, arching her back and howling into the air.

The thrusts suddenly slowed, but became a lot more forceful. Madison felt something else - hot, thick, sticky cum spraying through the tight cervix and directly into her womb. There was too much - it shot out of her tight, filled pussy and sprayed across her legs, webbing between their bodies. Both of them panted heavily, the girl’s face awash with a visibly heavy relief as she tried to catch her breath.

There was suddenly a crackling sound that caught their attention. “To assure viable pregnancy, we must ask you to repeat the procedure.” It was the mouse-haired scientist from before.

They glanced at each other for a moment. After everything, Madison actually wanted more.

“Round two?” She grinned.