Ty starts examing the beasts, thinking what form he should take before joining their revel. But his thoughts are interrupted as he hears a deep grunt from behind him. He feels meaty hands grab his ass, as he turns around to see a minotaur fondling him. The minotaurs brown fur doing nothing to hide his 6-pack and muscles, his chest rising and falling as he laughs deeply. Ty laughs with the beast as he realises how stupid he was being, why should he transform himself into a beast and join their horde? He should, of course, join it the correct way, as anyone else would.
Ty decides he should play the part and starts yelling "ARGH, YOU BRUTE. FUCK OFF, I AIN'T LETTING SOMETHING LIKE YOU IN MY ASS." The bull laughs harder as he hears this, his grip on Ty tightens as Ty feels fur tickling his back. The minotaur now resting above him, the manly stench of the bull causing Ty's cock to pulsate.
The beast repositions himself above Ty. Ty feels the tickle of fur, then the feeling of something as hard as a rock roam near his ass. The bulls member swaying in the air, slowly and surely getting lined up with Ty's pucker. The minotaur wraps his arms around Ty's chest, pulling him into a bear hug as Ty strains himself to support the beast. The weight of the bull is more then he expected, and he knows he would collapse to the ground if he was an ordinary human.
The precum covered tip of the bull finally begins its descent into Ty. In one deep thrust Ty is penetrated, he moans as he weakly struggles, playfully trying to push the bull off. The beasts head rests next to Ty's neck, its hot breaths against his neck. The beast moves its head closer in-between its thrusts, its tongue playing and nibbling against Ty.
Ty's struggles die down between the beasts thrusts, his cock twitches as it unceremoniously pours out his seed. Ty smiles as he realises this is the start of his transformation. He cums for what feels like an eternity, his seed emptying as his balls start to inflate. They become larger and larger, being covered in fur as they fill with minotaur spunk. His cock thickens and enlarges, becoming so large that it slaps against Ty's chest in time with the minotaur's thrusts.
The bull starts to roughly fondle Ty's chest, as his hand squeezes Ty's skin, fur begins to sprout. The brown fur moves around Ty's chest, the chest itself inflating with muscle as the fur moves past. Ty's chest becomes bulky, his new 6-pack is solid. The fur begins to climb his neck, the minotaurs licks and nibbles become quicker as his tongue touches Ty's new fur.
Ty feels his face press out, his nose becomes wet and pushes forward as he face reshapes. Pain hits the top of his head as his new horns begin to push out. The last changes progress as the bull stops thrusting and holds himself inside Ty. Ty's ass holds the bulls entire cock, the bull moos loudly as Ty feels seed entering his ass. The bull holds himself there for a few minutes, the seed causing a tail to push out of Ty, and cause his feet to compact into new strong hoofs.
Ty gives a deep laugh as the bull exits him, he stands and examines his new form. The bull from before grabs Ty and gives him a bear hug, which Ty responds to by giving the bull just as tight of a hug. "Welcome to the beast horde, now lets spread and cure these humans!"