Sister of Moon, descendant of Black

Aurora James Nixyn Potter Lupin Snape (her full name) gets kicked out of her house and goes to the nearby park. She finds someone who she thought she'd never see again. Not after that. It's Sirius Black, her old friend who she hasn't seen since she got adopted. He doesn't recognize her though, but Remus does and brings her to Hogwarts. She finds that someone very important to her teaches there. (note:this starts a day or two before kills the Potters so the Marauders and Snape are like, 19, 20 something like that. Other wise this story would seem very weird. if they were like in their 30's and Aurora was 16. I think thats the age she is)