Eddie Jackson was a pretty average 15-year-old boy. He did alright at school, he played guitar (even if he wasn't that good at it), and he spent a lot of time playing video games. And he jacked off quite a lot. In fact, at the moment everyone in the world started to change, that was what he was doing.
Consequently, he noticed it coming on in his head before it happened. He didn't do anything about it, but he did notice he seemed to be looking at the guy in the sex scene more than the girl, and instead of being curious to see her pussy, he felt curious about seeing his cock. Soon his T-shirt felt weird against his chest, so he pulled it off- and saw his body start to change.
Eddie's nipples looked larger and felt more sensitive. His head was swimming with weird fantasies- he imagined someone rubbing and pinching them, or even sucking on them. He felt harder than he'd ever been in his life, as not only his cock but his nipples were perked up and erect. One hand went to his chest and rubbed one, and he started to pant in response to the sensations. As he breathed heavily, his chest started to grow, and his eyes widened- he barely even noticed how the rest of his body was feminizing as he was so focused on these growing breasts, and how nice they felt to play with and imagine someone else playing with.
He only really started to notice when he felt his penis start to shrink. But surprisingly it didn't feel painful or uncomfortable at all- if anything, as his shaft receded away and his balls moved up inside him, he felt a newfound sense of clarity. She was turning into a girl. And she liked it, she liked how her body was changing and how this all felt. She especially liked the realization that very soon, she would have a clitoris that would be more receptive to pleasure and a pussy that could be fucked.
As she felt her body finish its transformation, a vagina forming between her legs and his penis receding to a tiny, sensitive clit, she looked at her body and smiled. A new name came to her- Emily. Even though this had been so dramatic and sudden, she kinda liked how this new form felt...