Lucifer is your roommate in a mental hospital.

He is known for being extremely violent and usually he has to be tied for safety of himself and others. You didn't mind though. As others called him a monster, you called him a lover.

Your mental problem was that you got attached and obsessed easily and would do anything to achieve your goal for the person. You'd kill for them.

You sat on your knees beside his bed and stared at him as he looked at you

"Untie me" he told you harshly