The Black Dog|| Bill Weasley.

"How you don't miss me
In The Black Dog
When someone plays The Starting Line and you jump up
But she's too young to know this song
That was intertwined in the magic fabric of our dreaming
Old habits die screaming"
- The Black Dog, Taylor Swift

OR IN WHICH

The younger sister of Sirius and Regulus Black has dreams of the future and tries to prevent them from coming true.

Fem Black OC x Bill Weasley