Siriusly?

What if Sirius Black had had a daughter? A girl who knew nothing about her very, ancient, and most noble name. In the corridors at Hogwarts, she'd hear whispers, "The Noble House of Black's Princess." She did not know what being a "Black" meant. What if she was only conceived as part of a plan made up by Voldemort? This is the story of Elizabeth Black.

Disclaimer: This is a work of fan fiction using characters from the Harry Potter world, which is trademarked by J. K. Rowling. Only the plot and some original characters are mine.