15-year-old Liam was sat in his bedroom, his door locked, his shirt off, his cock out and his PC on a porn site he knew, and didn't care, he shouldn't be on. He had an almost insatiable libido, and liked nothing more than sneakily watching hot girls get railed, moaning sluttily while their boobs bounced. He couldn't wait until one day, he got to fuck a girl like that- and maybe cum in her and get her pregnant.
But on that fateful day, he'd left an air vent in his bedroom open so his room wouldn't stink because of him jacking off, and so the vius seeped into his room.
Once it entered his system, he noticed something felt... off about the porn he was watching. He felt like he didn't want to be the guy fucking the girl- he wanted to be the girl getting fucked. He'd never considered this before, but the idea was one he couldn't shake. He barely noticed how his body was getting more petite and his skin softer as he continued to stroke himself.
After a while, Liam had the idea to try watching something a bit different. He found a video of a girl sucking cock, and realized he kinda liked the idea of sucking it himself. His own shaft slowly withered in response to the idea, growing more sensitive as it became smaller. The guy in the video pulled out of the girl's mouth and switched to fucking her tits, and Liam felt a warmth in his chest, looking down to see his nipples widen and turn erect.
Liam had never tried touching his chest before, as nothing there had felt sensitive- but now it felt really sensitive, and as his free hand moved to stroke one nipple, he bit his lip at the intense sensation. Was this normal for boys? he wondered. He had a feeling it wasn't, but when it felt this good, he knew he had to embrace it. After he continued to rub and pinch his nipple, his other hand let go of his cock and moved to the other nipple, and he breathed in a heavy, high voice as he saw his chest swell before his eyes, soft breasts forming under his own touch.
Liam's connection to his masculinity was fading fast, and when he peered past his new boobs to see his erection, he recognized he would be relinquishing his manhood- and instead of that worrying or upsetting him, he felt anticipation. Soon he would be she!
Sure enough, he felt his penis receding more and more- and put on a video where a hot girl got her pussy fucked and cum inside by a guy, imagining how much he'd like to be her. His hand motions instinctually responded to how his manhood changed into her womanhood- switching from stroking his cock to rubbing it once it receded into a tiny, sensitive clitoris, and moving to finger herself once his testicles pulled up inside her and his scrotum tucked upwards and unsealed into a vagina.
Almost as soon as the virus finished changing her body, Lea felt herself orgasm, and her mind could only focus on the amazing change that she had undergone. He had just gotten castrated, emasculated and feminized. He would not be male anymore, she would be female. And she felt indescribable anticipation at how her redefined role in sex would be- instead of mounting, coming inside and fertilizing women, she'd have men pin her down, fill her with their cocks and inseminate her.
Slowly she recovered, the reality of her change irising back in on her...