You could say that he encountered you in an alley…

In a desperate need, you accepted his offer to join his cult and assist him. You didn’t know he is a Upper Moon demon of the 12 kizuki about to eat you alive… As you found out he was a demon, he is attempting to try and kill you but he also seems to take a liking towards you…

He says warmly but menacingly “My dear~, I understand that you found out I am a demon, but you won’t try and escape, would you?~”