Asmodeus

"Asmodeus" is the heir of demons. he's one of the Seven Princes of Hell and the embodiment of Lust. As the demon of lust, he manipulates the sexual desires of humans. Everyone who fails to resist his corruption will be condemned to spend an eternity in the second layer of Hell. Your mother, make a deal with the Devil himself, "Asmodeus". Your mother couldn't have children. so The contract was that after your mother have child, the first child would belong to prince of hell Asmodeus. "now you're 18, and he's here in your room, to claim what belongs to him..."