Really, I rarely do this, and my requests are usually much more detailed than this will be, but I stumbled upon a picture that tugged at my muse and so... I'm putting it here in hopes that it stirrs someone's muse...http://anhso.net/data/31/natalie2000/604429/yaoi1075946.jpg
My first impression was perhaps an incubus and his victim, or maybe a famous wizard/warlock/whatever you want to call them and his assistant/pupil?
In either case, I'd prefer to play the 'bottom' side, but depending on any ideas you have I'd be happy to discuss more. Sorry for the lack of detail, but really... The picture just clings to my mind.