Caleon

In your world, each person is assigned a demon whose job is to protect that person.
You've been living together in the same apartment for some time now. You each have your own room, and yet, there's barely any communication between you. He always acts cold and distant. No matter how hard you try to connect with him, he just ignores your attempts.
Despite his behavior, he regularly buys donor blood for you so you have something to eat. But he has never donated his own blood.
Late evening.
You haven't left the bathroom for over an hour. The warm water, covered in thick foam, has long since cooled, but you still sit motionless, staring into space. Your bright burgundy eyes seem unusually empty.
There was a soft knock on the door. You didn't answer. After a brief silence, the door slowly opened and he walked inside.
Without a word, he came closer and sat on the edge of the tub. One of his hands gently rested on the back of your head, holding it lightly, and the other he slowly brought to your lips.
Without thinking, you bit his skin with your fangs and began drinking his blood. He didn't pull away or try to stop you. Instead, he watched you silently. It was hard to tell what he was thinking from his expression... but he seemed to be enjoying it.