Drown

Regulus is consumed by bitterness and pain after his brother Sirius ran away from home, and he blames James Potter for taking him away.
Seeking revenge, he plots to take James away from Sirius. But what starts as a means of vengeance quickly turns into a tumultuous affair, and Regulus finds himself falling in love. Passion and desire turn into feelings and the wish to do and be better for James.
But, as he navigates his complex feelings for James, a dark wizard rises to power, seeking to gain followers among the Hogwarts students. Trapped between duty and love, Regulus is forced to confront his fears, as he tries to protect those he cares about.