Ben's developing musk flowed through the room as Amber greedily reached out for Ben's zipper, ripping his pants down over his growing erection. Her hands grazed his expanding cock over his too small boxers, as a shudder of pleasure distracted him from his predictament and a different need began to develop.
The girl tugged at his boxers as they released his thick, black equine cock. She went to her knees as she lapped at it's swollen, flared head with her tongue.
Ben moaned as he felt his balls swell in size, his hands grabbed the girls hair as he bucked his large cock deep into her throat.
A pressing sensation at the base of his spine shot a bolt of desire through Ben. He wanted to be buried deep in this girl.
Amber inhaled Bens animalistic musky scent and failed to notice that her genitalia had darkened to a dull black, even as her enlarging vulva stretched and relocated to sit under her swelling, puckered anus.
Her thong stretched uncomfortably and the girl stopped her ministrations to the oversized cock just long long enough to remove it. She turned just enough to present her swollen vulva to Ben as he caught her scent. His nostrils expanded with each inhale, and his cock grew impossibly hard. Instincts of a donkey jack kicked in as he lost control.
Renee, standing on sidelines at the obscene exchange, watched in horror as the transforming man plowed his cock into Ambers drooling cunt.
Ben pounded his lengthened shaft deep into Amber's stretched cavern. Amber moaned with pleasure with each thrust, even as Ben's vocal grunts became deeper.
A pair of bumps began to swell above Amber's mound as her skin began to darken. A nub began to press out of her skin as her own jennet tail began to form.
Ben's own tail stretched and grew as it lengthened enough to tickle his puckered anus.
Finally, Ben felt his balls tense, he grunted as jets of semen impaled Amber's wanton womb.
He stepped back from the creature as his semen leaked out of her equine cunt, only to stare in horror at what he had done.