A contract with me dominates an antagonistic will, so long as I am stronger, regardless of who it is. Unless I break it or order it, they cannot hurt me.

[Except charm spells. But Naoki made sure that most of his demons were immune.]

Now if say an army of angels came after me right now, that would be an entirely different story. They would do their best to make sure I was wiped, if they saw me as a threat.