“Do that, Harry, do that”, Sirius said and smiled at the younger man. “I’m sure we will get along splendidly. I can teach you all the pranks your mother would never want you to learn.” Yeah, that’s how he imagined his life with Harry: Being the irresponsible godfather who would show him all the really cool stuff (and not just the parent-approved things) Lily would castrate Sirius for if she ever found out.