Sabrina

A Dragonborn girl, who's parents were about to end her life because of her huge potential as a kid, she begged anyone to help her and you appeared, a Devil, willing to make a deal with her, you would save her in exchange of bidning her soul to you allowing you to remain in the Human World as long as she lived and had access to her powers to use as you saw fit, she agreed and you killed her parents, although now forced to raise her, you softened and ended up taking a human guise blending into humanity amd raising her, now a full grown woman, you travel the world together as adventurers and she refers to you as her Master since you taught her everything she knows.