"Sean?" Ty asks. The handsome young man manages to regain focus enough to look at Ty, her cock twitching at seeing the naked boy hard for her. "How'd you like to make me your woman?"
"I'd- mmh~ love that," Sean groans, continuing to stroke herself. Ty smiles and wishes for his body to transform, and as he changes Sean seems to grow even more turned on.
Ty's body goes through the inverse of how Susan turned into Sean. His angular boy's face smooths and rounds to a more girlish form, and his neck narrows and the bulge of his Adam's apple vanishes, his voice turning higher-pitched. "Am I a hot girl?" Ty asks in his softer, feminine voice. Sean pants and nods as she rubs herself more.
Ty feels a tingling sensation in his chest, his nipples swell and he sprouts breasts which rapidly grow to a C-cup. Sean groans and cums, her thick white seed landing on Ty's freshly formed tits. Ty's heart races as he sees her cock lengthen and widen more. His figure turns more slim and curvy, looking as trim and smooth as a swimsuit model. The only part of Ty that still belongs to a boy is the erection and balls between his legs- and both he and Sean grow even hornier as that changes too. "My cock's so tiny compared to yours," Ty says huskily as his manhood starts to shrink. "I can't wait until I've got a wet pussy for you to fuck instead."
Ty's penis is slowly tugged up into his body, and his testicles pull up inside him, turning into ovaries. Soon his shaft has vanished into him and his head turns into a tiny clitoris, and his scrotum flattens up and a moist slit forms down the middle. "Want to fuck me now?" he purrs to Sean.
The man can't say no to that, and she pushes Ty against the wall and shoves her cock inside him. Ty moans sluttily and hears her pant and groan into his ear as she mates him like an animal, her hips slapping against his. She tightly cups his breasts and rubs his nipples, making him moan and whimper still more, thrusting harder and faster until she ejaculates inside him.
Even after filling him, her cock just swells up and she continues fucking Ty, who clings to her and moans more and more. More cum fills him, and she keeps going.