Simple concept..could be a long play or a one shot.
A girl uses a guy for sex. That's it.
Most RPs are the other way around, but id love to do one about a nice, gentle hearted guy, who gets preyed upon by a girl who just wants to fuck with no feelings.
Love the idea that she probably pressures him into sex, and doesn't care about his feelings getting hurt. Could include her being out and out forceful..or just manipulative.
She need not be in any way sexually dominant. She might be quite submissive in the bedroom even...but the point is she's all about using him physically, without caring if she breaks his heart. :)
She could be older or younger.. Dominant or submissive.. I don't mind.. :) there may be complex reasons for her behaviour.. She may just simply be a bratty cold hearted bitch! She may just want to get laid and not care about the consequences... Or it maybe she actually enjoys the powertrip of hurting the guy. I'm open to all sorts of variation on the theme. If you can work with the central idea.. I'd love to hear from you!