The Black Cat

You’re an Animagus, a black cat is yours. What happens when your best mates son finds you (like Peter you have been in your Animagus form form years but unlike Peter you haven’t betrayed James instead you stayed in your Animagus form to protect his one and only son Harry Potter also Peter’s Animagus is a rat, Harry’s friend Ron owns Peter but he doesn’t know that Peter was actually a human.)