Cosmina Potter is Harry Potter's younger sister. She will have to learn how to accept her Slytherin side in Hogwarts as she works out her own differences from her brother.
Delena Malfoy is the sister of Draco Malfoy. She is a beautiful girl who is also in Slytherin with Draco. Well then there's Harry Potter. While her brother hates the boy who lived she finds him to be actually quite nice.
Find out What happens in Forbidden.