Writer's introductions

So in this story you will be Bellatrix Lestrange's sister. You'll be around 35-40 years old. And no, you won't be evil, you studied at hogwarts and were in hufflepuff, opposite your sister. You're a powerful witch and try to protect the people you care about. You were friends with Sirius Black, Remus Lupin, James Potter, Camilla Black and Lilly Potter. But what happens when your sister turns into a psycopath and torturer and goes to azkaban? What happens when you don't see your friends for nearly 20 years? And what happens when you meet Harry Potter after all this time?