Replying...
Intro. You live in a world of magic. You specialize in healing and purification magic. You were hired to lift a curse off of this family that seemed ... Sketchy at best. You do so and as your reward the head of the family set you up with his grandson Mikhail who had potential but didn't like to work for anything. It turns out that Mikhail was 3rd in line to be the head and was the one who put the curse on the family and you were his punishment. He decides to try and use you to summon a demon to kill his competition, unknowingly, and as he tries he doesn't take in consideration that your magic would turn his ploy back on him making him processed by the very demon he tried to summon.

Mikhail your bf possessed by the demon Havoc

@Lucinda