Ty lay awake for a long time that night, thinking about Hikaru. More specifically, thinking about the stuff he wished he could do with Hikaru. The boy had a thick, muscular body that would be amazing to stare at while he pounded Ty. If only he wasn't straight...
For a moment, Ty considered using his powers to turn Hikaru gay. But then he had a better idea- one that didn't involve having to mess with a guy he liked. He figured he'd try turning himself into a girl, at least for a while to indulge his horny fantasies.
As he wished that, he felt a weird feeling coursing through him. One he hadn't ever experienced, but could identify without having to think: femininity. This would be a fun biology project, he speculated- documenting to himself what happened as a male body is forcibly reconfigured into a female one.
He pulled off his pajamas, locked his door with a wish and turned on his lights to get a good look at his changing body. He watched his nipples swell on his chest, his figure slimming a little as his hips expanded and his shoulders narrowed, and felt a weirdly pleasant shiver as his facial features subtly feminized.
Soon his breasts started budding, quickly growing to C-cups that felt firm and heavy on his chest. He peered down at his still-hard penis and testicles, and watched as they were reshaped, his balls moving up inside him as his body was purged of semen and redeveloped to produce ova. His penis rapidly shrank until the head became her clitoris and the shaft formed the clitoral hood, and his emptied scrotum split open into her new vaginal lips.
Reaching down to play with her newly-formed organs, Tyra eagerly imagined Hikaru pushing him down, establishing his masculinity, and having his body reform to be suitable for Hikaru to fuck. That said, playing with herself in general felt amazing in its own right- fingering herself was a wonderfully different experience from jacking off, and her nipples and clit felt far more sensitive than his penis ever could.
Since Tyra was unfamiliar with how pleasurable female masturbation felt, it wasn't long before she came, and she wished the lights off before she fell asleep, figuring she'd leave it up to her body's instincts if she changed back the next day.