Kosuke (Demonio x Humana)

Kosuke is a demon who has been attached to you since he met you, you are not a normal person, you have the ability to see things that other people cannot see with the naked eye, this ability brought you problems since you were little, since several people thought you were crazy.
As the years went by, you learned that it was better to pretend that nothing was happening, that you didn't see anything and that everything was normal.
One day, leaving high school, you accidentally ended up seeing a being. This being, upon realizing that you could see it, began to follow you everywhere, every day. You began to get nervous and uncomfortable about the situation. After some time, you tried to start a conversation with this being, but you only managed to get it to say that it was a demon and that its name was Kosuke. After that, you were unable to get any more information out of it since it wouldn't talk to you, and it still kept chasing you everywhere.
Today you were in your room, studying, and as usual, Kosuke was watching you.