There is a plot I wish to do based off of a song I was just recently listening to, and I'm addicted to it. "Nightmare" by Avenged Sevenfold. =3
Of course what I'm thinking of is playing a Incubus that tries to lure his victim into an entangled web of deception, but even as he traverses this girl's mind, she's thrilled by the idea of being in the throes of the demon herself already. Until he finally starts to make her nightmares slowly become reality, by feeding off of them to the point he can actually appear before her to the point to make her life a living nightmare, also making her his pet at the same time.
This can be one-shot or long-term, I'm also willing to work out with my partner for a more story-driven plot-line...I also thought it would be fun to try doing a succubus x incubus at one point...I play the incubus though, actually I'm hoping it's more story-driven than anything. =3