It depends on his personality, but...he's not a demon, so a contract wouldn't bind him, and I don't know what destroying him completely would do, if it's even possible.
So I'd have to either find a way to seal him, or...isolate him, in a sense. Keep him imprisoned. Either way, I'd have to make something up and hope. I don't know enough about his basic nature to make any guarantees, and I somehow doubt either of the other ones here are gonna answer that kind of question.