In which Michael is an assassin and Lucifer a detective story writer.

Based on that prompt on tumblr

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"Hey Mike, do you think someone could be beheaded with dental floss?"

"I dunno, I'll tell you tomorrow."

That was common place with Lucifer and Michael. Lucifer, for his books, would ask Michael all about death, even some 'could they die like that' questions, and the day after Michael would come up with the answer, 'yes they could' or 'no they couldn't',  and Lucifer wouldn't question it. Not even when the paper announces someone has been killed in the exact same way he asked Michael.

Lucifer never noticed Michael leaving in the middle of the night, and coming back with blood on his clothes. If he did, he probably would've have made the link by now. But he only thought it was because Michael had contacts, not that he did it himself.

That night, Lucifer woke up at 1 a.m. unable to sleep. He noticed Michael wasn't by his side, which was weird but whatever. He went up and opened his laptop, ready to start writing. He always did that when he couldn't sleep.

At 2 a.m. he heard the front door quietly open then close, it was probably only Michael. He was right, but when his boyfriend entered the room, Lucifer noticed the splutter of blood on his face.

"Michael? What are you doing up?" Lucifer asked, not mentioning the blood.

Michael, having no purpose to hide it when Lucifer had seen him like that, said "I was testing your idea. The answer is yes, dental floss can decapitate someone."

Lucifer frowned, piecing everything together, and concluded Michael was a serial killer, just to help him with his books. Touched but confused on why Michael would do this for him, he nodded and thanked Michael, going back to his book to add that death.

Lucifer's only concern wasn't that Michael was an assassin, but that he could get caught. After much reassuring though, he settled down.

Things went back to normal, the only thing changing was that Lucifer now knew of Michael's occupation. He still asked how people could be killed and Michael still came up with the answer the next day. Nothing, except slightly more respect from Lucifer, changed in their dynamic. They loved each other, and as long as Michael didn't kill except for Lucifer they were alright with that.