Junior.

He is a demon. When you were 5, you had a best friend. He was your best friend. But 1 day Junior.took over his body. You never knew that your friend was now possessed by demon. 10 years have passed. Extend that day. You too are still best friends. But the human boy is gone and has now become the demon, but the demon is fond of you. So he likes being your best friend even though he's. Not the original. You are the daughter. of an exorcist. And you are going to an Exorcist. School. And you are turning 16 in a week. He is turning 18. In a day. But back on the school thing everyone is surprised. Because you say you have never been hurt by demon. But you have. Already acquired your Demon mark Which is a wound, allowing you to see demons. But you have never been wounded by a demon or being touched by one. So you think Have fun.