Hmm… that’s a good question. I think my favorite, as odd as this may sound, is hypnosis. I find the idea of hypnotizing someone, particularly someone originally in a position of power, very arousing (at least in an erotic story). The blank eyes, the monotone voice, the helplessness obedience — I have to cross my legs just thinking about it! It’s something I’d love to explore more of in my future writing.