You were under the impression that the grimoire your friend had given you was a petty joke. A generational book that had been passed down for centuries, but it had been collecting dust in the attic for years.
He doesn't have a keen eye for magic, so when you had been helping him move stuff out of the attic - who are you if not a little interested in the contents of the dark cover?
You're not unfamiliar with blood magic, but the warning alarms that had blared in your mind the minute you read that it required a single drop of blood... you took the risk.
You took the risk, and the moment your blood splashed on the strange sigil you had drawn with chalk in the centre of the room, you had to take a while to notice that you weren't alone anymore.
The moment you saw Hyuuka stretching out languidly on your desk, your entire world crashed down on you. An Incubus - you already see the physical attributes of a demon. Golden eyes gleam at you, horns seeming anything less than friendly.
His tail curls. "What a lovely sight you are," the Incubus purrs.