Having just shrunken Dustin down to size, Ty kind of had bodies on the brain. He decided he'd like to try changing his own scrawny form. He locked his bedroom door and undressed, pulling off his PJs and boxers before sitting on his bed naked.
He stared down at his penis. Like most boys, he'd never thought much about that part of his body until a couple of years ago, at which point he had developed an intense fixation. It had been so weird to him to realize these instincts he had were shared by almost all animals, and it had become a guilty pleasure of his to find out about their genitalia. He wasn't exactly well-endowed, but he longed to get to use this shaft.
It occurred to him, he could probably use his power to transform his cock. Ideas swirled around in his head- obviously he could make himself way larger, but should he just have a big cock by human standards or an absurd horse cock? Maybe he could give himself a knot or penile spines, or grow a second penis? He could always make himself able to carry eggs as well as sperm, and reproduce with himself... or maybe he could even try transforming his penis into a vagina, and find out how it felt for girls?
Ty was getting super carried away with these fantasies, he knew that, so he decided to just ground himself with one to start with...