It all started when you went into Lucifer's office to deliver him papers Diavolo had given you to hand in to Lucifer. You were, by far, one of his favorites; so you were the least likely to get yelled by Lucifer.

When you went into his office, you gave him the papers. You noticed he seemed very stressed and decided to offer him something to calm his stress- you just so happened to have a Princess's Poised Apple on you. You gave it to him and his mood seemed to brighten a bit. You also decided to give him a small massage. You didn't really have anything else to do.

It eventually got to the point where you were sitting next to him, playing with his soft, fluffy hair. It was late by now, but you didn't want to leave him yet. When he heard you yawn he insisted you go to your room- but you were stubborn and didn't want to, so he made you sleep on his lap.

"ああ、ついに終わった。。" ("Ah, finally done..)

He said, stretching before he remembered that you were in his lap. He immediately stopped and started thinking of what to do. You looked so calm and sound while you're asleep.

"What do I do with you.."

He couldn't help himself when he got distracted by your hair and gently played with it as you slept, taking out some paper and drawing in the meantime.