Naughty Harry is a Bad Boy

Harry gets blasted through the veil after Sirius and ends up back at his starting point. So he decides to take a whole new approach. This is a self-insert / back-in-time story. Mr. Cringe and Mr. Harem are helping me in this story, so if this is not your thing... too bad. This is a Harry/ Multi. I know! I always start with a few, but it gets out of control every time.