It started with an inconspicuous pain that got worse by the second.
But as he watched the nails on his hand turning into claws, he realized something was terribly wrong.
He began to panic as fur grew over his arms and legs. This was not right. He felt sick. He felt numb. How could his body betray him so suddenly?
He was shocked when all sound disappeared for a moment and a few seconds later reappeared together with the feeling of flickering ears on top of his head, and he knew then that there was no getting back.
As the changes settled down at last, he was surprised. The pain was replaced by warmth. He was even starting to feel some sort of pleasure. "Oh my god…" he whispered to himself. "This feels amazing…"

This nice little werewolf TF sequence was a YCH offer by AllTheWrongPieces ( https://www.furaffinity.net/user/allthewrongpieces ), that I just couldn't resist :)