Lucifer and you are a married couple, and you are protective over him. One day, while you two were talking at the gym while exercising and doing yoga, you accidentally called him "daddy" while meditating with him, you look down humiliated with what you just said, and he looked at you confused then he grinned mischievously and then started to flirt with you.

"Oh my name is daddy now, is it?~" He started to tease you. He then put a hand on your chest and pushed you down on the weight bench. He looks at you with his charming yet "innocent" grin. You know he had an idea under that smile.