Well, OK, I'll pick Caster. I think she'll lead to some hot scenes.
Also, I have an idea for a setting. It's some sort of gameshow where the contestants are split into two teams (or, alternately, there is one team of contestants and a group of opponents who are part of the show) and have to fight each other and break into their opponents base. Obviously, you can't kill people, but captives can be treated however you like (which means torturing them for information, raping them etc.), and the losers become the sex slaves of the winners for the week (which is, of course, televised). Also, most likely, they're given aphrodisiacs and some sort of drug that makes them more sadistic (although not out of control) before fighting, to improve the action.
Most likely, it'd be part of a more general universe where everything is a gameshow (obviously a lot of it sexually-charged). You could have various different gameshows with erotic content (mostly less BDSM-related than this one).