Ty had always had a particular fascination with werewolves. When he read stories that described how they transformed in graphic detail, or watched movies where he saw human bodies reshape into part-animal ones, it just always stirred something in him. He desired so bad to experience that for himself.
As soon as he thought that, he felt an intense, primal stirring deep inside him that rapidly spread through his body. His instincts began heightening, his sense of human rationality receding. He heard his breath transitioning to guttural pants and growls.
His muscles tensed and firmed under his skin and clothes- speaking of his clothes, they seemed constraining, unfitting for his emerging self. He noticed how his fingernails were thickening, darkening and sharpening. He had claws. And he knew what he wanted to do with them. He sliced through his T-shirt and threw it off, pulled off his pants and slashed up his underwear.
The naked young male- 'man' felt too human to fit- caught his own reflection and smirked as he noticed his eyes were a striking lupine yellow and his teeth had sharpened to fangs. He stretched himself to all fours, surprised how comfy the position was, his muscles rippling and continuing to strengthen. He felt a tingling in his hands and feet as they became paws, his toes melding into three digits and forming claws.
A prickling sensation spread across his skin, and he saw and felt thick, black fur emerge to cover his entire body. The hair on his head merged into his pelt as it enveloped him. A twinge at the base of his spine made him involuntarily shift its newformed bones and muscles, and he saw a spiky-furred tail wagging behind him.
The shifting of muscle and bone moved up to his face, and he saw his face transform itself in his reflection. His sensitive nose darkened and narrowed, while his mouth protruded into a large snout, making room for his large sharp maw. His ears enlarged and moved atop his head, in a perfect position to hear and sense more.
Ty thought for a moment he had become completely a werewolf, but then he felt a twinge in his loins and noticed the human penis between his legs. He groaned in pleasure as he developed a more bestial phallus. It thickened and turned a deep shade of red, its tip sharpened to more of a point, its base widened into a knot. A sheath surrounded it, though it stayed in its erect state. The millions of sperm within the lycanthrope's fertile testicles changed from primate to lupine.
The newly minted werewolf could barely handle his intense instincts. Hunger, anger, lust... they piled up within him. He knew just how to start to release them- he stood up on his hind legs, and without a care for the consequences, released an animal howl of unbridled desire.