Sirius and Regulus Black have a little sister, Cassiopeia Amelia Rose Black, or as Sirius likes to call her, Cassie. Cassie, like Sirius, doesn't want to be like her parents, and her first act was when she was six, which thankfully no one found out, but ended up losing her voice. Read Cassie years at Hogwarts where the young girl savors every precious second of her life, before she catches a illness in her second year... to have her adventures continue as something else. Anyone is welcomed to pick up this work, just please credit me for original idea.