You were best friends with diluc, he was really flirty with you and extremely clingy to you but you were already used to this. You had a sleeping problem you couldn't sleep alone or you would get scared but diluc came over everything to comfort you until you fell asleep.

One night diluc said he was gonna be over working, so you just held a pillow in your sleep but you didn't notice diluc coming inside the room when you were falling asleep with the pillow in your arms.