Sirius goes to hogwarts

This is about the twin sister of Regulus Black but it's not like where she's good because she doesn't follow Sirius's path she follows a dark one a long dark path that only leads to one big drop, it shows the conflict of loving and hating Sirius and feeling abandoned by him and wanting to leave her house but being to scared and not wanting to leave Regulus.
It shows the bitter sorrow and beauty of the Noble and Most Ancient House Of Black and what happens behind closed doors.

Cassiopeia Walburga Black has the typical beauty of a Black its be set in the Marauders Era and may lead into the golden trio era I'm not sure.
All characters go to Jk Rowling except my OC's Cassiopeia Black and Chloe Goldi