The Corporal's Daughter (Eren x Reader)

Your Corporal Levi's biggest secret and the Walls biggest weapon. Only your father (Levi) and your mother no of your existence but when your mother dies on the battle field when you were five forcing your father to put you into hiding. But what happens when Erwin finds you fighting in the underground and drags you into working for the Scouting Legion? how will your father react? Who's Eren? And more importantly what the hell are you?