Wouldn't they become werewolves too if attacked? I liked Sirius's attitude and I loved OWLE!
Aunt Laura? I thought it was Linda. Remus should have called him on that. (I loved the line, btw)
..."so, Remus, how's your Aunt Laura?"
"Linda," said weakly. "Auntie Linda." And he smiled. (The tone reflects that he knew he'd been caught in a lie, and he's acknowledging it.)
I think you have a lot of potential here. Work on your adjectives.
Sincerely,
Rita
PS I'm thinking about writing a little story about how Peter became a Marauder.