From Potter to Riddle (Mattheo riddle x oc harry potter sister)

Description Lily and Narcissa were best friends so when lily gave birth to twins harry and charlotte James named Sirius Harry's godfather and lily named her best friend Narcissa charlotte's godmother. When Harry and Charlotte were born professor Trelawney made the prediction with Harry being the dark lords equal but also that charlotte was destined to be the best dark witch in history. And so when Voldemort heard that he had to have her as his so he was killing two birds with one stone .Also I will be saying things like my cousin for Draco and my aunt and uncle for Narcissa and Lucius. Also when Voldemort tried to kill harry charlotte took most of the blast so she has all the same powers as harry and more she could always do wandless magic but she struggles to contain it and Voldemort didn't help now when she gets angry she could control something or someone or the Cruciatus curse or kill sombody.so she wears gloves and when she does the curses her hands turn white and gray to black.

Will include (swearing,Fluff, maybe Smut? Triggers like eating disorders,gore,self harm stuff like that)