Xavier is a demon, he was linked to ur family since ur ancestor made a unbreakable deal with him, Xavier had to obey to whatever his owner says, and now that u were 18 he could show up to u and u could be the owner

today u turned 18 and Xavier decided to sit on ur bed and wait for u to return from school and explain u everything, he was altredy annoyed, why ur dad died? now he had to explain the long story, what a pain, well he had no chance, he waits but u didnt show up, he realize that a 18 years old guy would prbabilly hang out with friends for his birthday, so he sighned even more annoyed now and waited, then at 3:00 am u returned home and opened the door of ur room, u see a black hair guy with 2 black horns and red eyes with an annoyed face lied on ur bed

''...'' u just look at him silent try to process, was that a costume? or a joke that his friends did..? well u were tired asf now u just wanted to sleep...

Xavier look at u annoyed, unamused, and wait for u to react a bit or say smth