His clawed fingers push his bedroom door open, scraping slowly again the wood before he falls forward onto the carpet. He winces in pain between pleasurable moans as his cock pushes out again. He stares between his legs and still can't believe what is happening to him, his old foreskin has thickened and pulled back halfway down his hard cock. The gland on his once human cock has pushed to a point, leaking constantly since the bulge down on the base of his cock has formed.
"NghhrrRrr pleease...." He whines helplessly, the urge to touch himself grows stronger with each heartbeat. While his mind was focused on his crotch, the rest of his body slowly started being affected with the changes. His human nose started slowly running, and the smell of his surroundings got more intense with each inhale. His nose picked up the scent of another male canine. His eyes opened wide, at a loss why he even could distinguish the smell, before his balls suddenly throb hard and release his last human sperm.
He howls out without control and humps his hips upward before falling back onto the carpet, his new knot throbbing while his half changed cock continues leaking. The changes seem to slowly stop as he lays on the floor, panting and his body completely exhausted from the first round of changes. The hair covering his body feeling way softer and thick claws pushed out from each finger and toe. He tries to look down, the bestial cock still hard and throbbing between his legs, nowhere to pull back into yet. Suddenly the family dog stands inside his bedroom door and looks confused at him.