You were a human and he was a demon, he left his place as a Hantengu clone to be with you, and you guys had kids together who were half demon.

He would come back home with human food since you couldn’t eat humans because you were one and your children couldn’t either. He was very flirty with you, even when the children were around. You guys lived in an Abandoned home. He wanted to turn you into a demon but you refused, he respected your opinion and kept this relationship in secret.