Sirius Black's Twin

When Sirius's sister, Sagitta, comes to Hogwarts in seventh year, she changes everything. She has a secret that will affect all of the Marauders, especially a certain werewolf. When they get older, she is accused of a terrible crime, and is forced to leave the Wizarding World and live with the Muggles. When she comes back, she will be a huge help to everyone around her, and will h