Having successfully interbred with a female, a strange concept came into Ty's head. Now he knew what animal pussy was like- but what was animal cock like? It seemed like it would be just as fun to get fucked and knocked up by an animal as to fuck and knock one up.
Ty looked down at his body and smiled slyly as he prepared to use his wish to remove the barrier to a whole new part of his corrupt fantasy. A shiver ran through him as his body reshaped- his skin softened and smoothed and his figure turned petite and curvaceous.
He wasn't sure if it was because of his horny teenage desires or some corruption of instinct by the wish, but as the wish altered his genitalia the sensations grew more pleasurable- his nipples swelled and turned erect and soft breasts sprouted on his chest, and his penis, testicles and scrotum slowly receded into his body and formed a vagina, ovaries and vaginal lips.
The inversion of sex slowly pervaded Ty's self-perception. He had been willingly castrated, emasculated and feminised- now he would be she. Males would mate her and give her their offspring just as he had done to that rabbit.
She wondered what animal should take her female virginity. (A/N: obviously feel free to add your own!)