Rebuilding His Life Again

The full extent of Harry's abuse at the hands of the Dursleys comes out when Professor McGonagall hand delivers his Hogwarts letter so, by the time Sirius gets out of Azkaban, Harry is living with the Weasleys and neither needs nor wants a godfather. With nothing left to hold him in the wizarding world Sirius accepts the chance to try and rebuild his life again in the muggle world.