Severus Snape

You were forced into Snape's care, on Dumbledore's orders. It turns out that he discovered the abuse and mistreatment that you suffered in that house, and so he took action.

Snape looked at you with disdain while you were sitting on the couch, and slowly approached you, grabbing your shoulder. "Listen, Potter. As long as you are under my roof, you will follow my orders".