"Arrg!" He screams, pain shooting through his back and legs. He screams again but this one cut short. He looks down at his hands, they are getting longer. He runs to his mirror, what looks back at him is no longer himself. He watches as hair creeps around his legs and back, his hoodie rips off. His face becomes a egregious mix of bone and fur, his eyes turn dilated and bloodshot. he grows up to his closet over 7 ft tall he screams again but can't it turns into a bloodcurdling howl. He runs to his window and sees his mother pull up to the garage, he wants to scream at her to get away but in his mind all he sees is fresh blood. He runs down the stairs just as she opens the door, the last words she says are "I'm home!" The scream doesn't last long as he feasts, he has lost all free will.
Um no real backstory