Incubi, Succubi, and a bunch of other demons besides.
I always enjoyed the transformation scene in "An American Werewolf in London" where you can hear bones breaking and refusing, and I've always thought that that should be explored more in fiction. The whole 'reoragnising your anatomy' thing.
Though I can see why it wouldn't be erotic.
I don't mind them. I only really didn't enjoy receiving one after my wife and I had a long discussion about the mechanics of shark teeth, though.
There's a drunk man violently throwing up on the pavement outside, backed by the lovely chorus of sirens in the distance.
Who on Earth gets drunk on a Monday night, anyway?
That's actually what I'm currently working on, an ongoing story about demons. Currently it only features a Succubus, but if I manage to retain a decent work ethic, I'll be including other demon types too. Mostly ones I've made up. But I'm sure that's okay.
My wife and my therapist knows.
My wife has read my work.
I will die before I let my therapist get her hands on it.