Harry and the Avengers

Sirius rescued orphaned Harry from Godric's Hollow instead of chasing after Pettigrew. He takes Harry to his cousin Natasha Romanoff and they raise him with the help of the Avengers. Harry arrives at Hogwarts, independent, already knowing magic, and knowing how to defend himself. In short, the Hogwarts Professor's are going to get a shock. Rated T because I am paranoid