My Best Friend's Sister

Christmas 1996, When visiting Mr Weasley in hospital after his snake attack at the ministry Sirius takes Harry to meet an old friend who is living in st Mungo's temporarily though he plans to return her to Grimmauld Place as soon as Dumbledore agrees since the Order are at No. 12. Flashbacks to the marauders days at Hogwarts with this friend and Extended Potter Family. set OotP