Something for Nothing

MC is an OC, Castor Black, sister of Sirius and Regulus Black. She comes to Hogwarts for the first time after studying for three years at Durmstrang. She has a complex family and some sinister secrets. Runs from her fourth year (Marauders' fifth) until after Hogwarts. No Voldy. Marauders fic loosely based on ATYD by MsKingBean89. Passes Bechdel test by Chapter 3. Switches POV.