Katie was excited for her freshman year far away from home, on campus and in the big city for the first time. She was overwhelmed by settling into dorm life and seeing so many people. It was intimidating, especially the sorority girls who all seemed so self-assured, confident, and beautiful.
To try to acclimate herself, she wound up at a huge party. The music blared as she sipped her drink from a plastic cup. One cup became a second and she began to feel herself loosen up, smiling and giggling automatically as the crowds swirled by her, swaying absently to the beat. She kept drinking.
Morning came to her like a freight train. She was completely naked in a strange bed with every muscle complaining of soreness and a disgusting, salty taste in her mouth. It didn't end there, with a mess of thick, layered patches of dried gunk matted onto her body as if she'd been basted in clumps of mayonnaise overnight. It took effort to scrub herself clean and then she spent an hour crying in shame and humiliation in her dorm room shower.
She tried to piece her blurred memory of the night back together. She couldn't recall any guys who did more than smile and hit on her a little. Instead, she remembered a girl talking to her… Scattered remnants of slurred conversation came back, but the woman's face was a total mystery to Katie. All that she had was the impression that she was very pretty, someone who should be the center of attention but was spending her time with little ol' Katie becoming fast friends for a night. This girl, whoever she was, had led Katie aside and they'd kissed and it hadn't ended there.
Katie had the disjointed memory of being tangled in sheets with this girl peppering her with kisses, her hands roving over Katie's body as she tried to manage to say that she had never done anything like this with another girl before. The stranger had laughed. When she pulled down her pants, Katie watched wide-eyed as a forearm-thick shaft emerged from her panties. Throbbing and sitting above testes the size of softballs, Katie had been too drunk to articulate how afraid she was staring that thing down, all the more concerned because it was attached to a woman's body. She retained flashes of being violated in every way imaginable with white globs gushing from it and smearing across her skin. She was battered like a ragdoll, utterly ravaged by relentless thrusts at an impossible pace until she blacked out.
She was too ashamed to report it and didn't have enough detail to identify whoever she had been in any case. Katie coped as best she could, putting on a strained happiness in calls back home to her folks, and tried to keep up with her classes. The shock came a few weeks later. As she was up late, working on a paper, moonlight shone in through her window. Something about the pale glow of the full moon was irresistible. She stared up at it and, for no reason at all, felt herself getting wet. Katie gave into the flush of heat and hormones, fondling herself in a way she hadn't been able to since the incident. As she got off, something felt wrong. Her finger slid over a shape that should not be there, like a lump under the surface of her skin.
Stripping down to see it with her eyes, there was a bulge forming at the top of her mound, a tiny tumorous nub that throbbed in time with her quickening pulse. Her mind panicked, but her body was still so overcome with horniness that she couldn't stop masturbating. As Katie kept frantically molesting herself for relief, the thing grew larger until its shape was unmistakable.
A micropenis had sprouted above her labia! She could feel it with startling new nervous connections as her fingers inspected and prodded at the inches of new flesh growing out from her crotch. In horrified fascination, she stroked it and felt it stiffen with completely alien sensation, swelling to just over three inches long. Katie was trembling, unable to help herself from stroking the thing as she reeled mentally from the impossibility of this body part. She came harder than she ever had in her life, exhausted and with the intruder to her biology pulsing in her grip.
In the morning, she didn't care that she'd overslept for class. The first thing she did was notice, blissfully, that the sense of having something where there shouldn't was gone, which a run of her hands and a final inspection in the mirror confirmed. It was gone! Katie chalked it all up to a traumatic nightmare after her experience with the party girl and hoped it wouldn't recur. It had been so real though, so outrageous.
The next month, once more under the light of the full moon, the tingling between her legs returned and Katie found herself helplessly fingering herself in her bed, writhing in mounting pleasure as, dreadfully, the same nub grew out of her groin, this time even faster and fuller. She didn't want to address it, to take ownership of it, but there it was: her cock, undeniable and aching with need. She spent the night furiously masturbating with abandon as the transformation continued to take hold. A ballsack emerged beneath her shaft, swelling with two testes that grew to the size of oranges that Katie cupped as she jerked herself raw. She felt her organs rearranging within herself, presumably to make room for a prostate just as inexplicable as the rest of the new plumbing. She cried, with relief and anguish, as she began to spray white ropes across her bedroom until she was left, at last, a hyperventilating wreck covered in her own semen, drowning in disbelief of her own body.
Blessedly, it was gone in the morning and she was entirely a woman once more, but, when the moon was full again, it came back with a vengeance. At every lunar cycle, it grew larger, more insistent and her masturbation more extreme. Soon enough, she reasoned, her hand wasn't going to cut it. She was going to lose control, tear off into the night, find a woman, and do terrible things to her. She couldn't let that happen.
But what could she do? Doctors would think she was crazy if she brought the story to them or carve her up as an experiment if she showed it off in the moment. Friends would freak out. No one would believe her and, if they did, they'd never talk to her again. The only thing that made a semblance of sense was to go back to the source. She had to find the girl from the party who had done this to her, made her into this thing, and hopefully get a cure out of her before she did something she would regret.