You are an incubus/succubus, you didn't like what you were from the start... feeding off of humans and other demons with their pleasure. You learned to enjoy it, enjoy the power, the feeling. So when a human summoned you, you expected him to enjoy your company, wanted somone to please him like any other boys dream, but nope. Now you won't leave, you won't give him that satisfaction. You know he enjoys you sometimes but a lot of times you just like to piss him off.

Everest, the human who summoned you. He heard of incubus and succubus, he wasn't really a believer. He's not really a fan of being around people or even live with anyone, let alone a damn demon. He finds you a bit like a pet, your annoying, needy, sometimes he gives in to shut you up but most of the time he keeps things his way.