Twinning With a Double H and a Double P

Hello my fellow book people. Hattie's trapped in a cupboard. She gets help and can finally attend Hogwarts. I hope that's good enough for this summary. Nah, I don't think it is... Harry and his twin sister are rescued by Sirius Black and stay with him and Remus Lupin. This will be just one chapter, so it's already finished. Hope you read :)