The Puppets Mistake

You are the queen's puppet, a mysterious and cold person.
You have brung yourself a demon maid, and you have no one else to actually care for.
Your mother died at age 4 from lung cancer. Your father constantly hurt you when he was drunk, mentally and physically. You couldn't take it anymore.
You killed your father with a single shot. Execution style.
You ran as far away you could from home and at age 9 was put in a sex trade. And that was when you summoned a demon you named Alexandria Constaline. Ever since then you inherited your parents' wealth owning 9 companies worldwide, having a luxurious manor and at age 12 you became the queen's puppet. Solving cases with your demon.