Prologue: 10 Years Ago

I know have done stories on Harry, Ron and Hermione having other siblings. But I have not done one with a friend who is not blood related. This series is about Krestena Black the daughter of Sirius Black and goddaughter of Remus Lupin. She is starting her first year at Hogwarts? How does she become friends with the golden trio? Want happen to her mother Rachel Black (nee Cullen)? Picture of Krestena on cover.