Okay, well you seem to write pretty well (Likely better than I do >_<) so I am interestead, however, rather than dictate the nature of it completely, I would like to give you some options so you can enjoy it more as well, soo... Let's go down the list:
Setting: I would like there to be magic, it's a strong pereferance, though whether it's a modern setting with magic around the edges, or a swords-and-sorcery setting is up to your preferance. If you don't care, I'd go with Modern, just so there's a decision.
The Woman: Two options here again, either a "paladin" sort, a woman with a righteous cause fighting against either the evil that captures her, or against some other evil (in a modern setting, perhaps against the NRA or tobacco industry) which hires the powers that capture her. Also possible, if you strongly perfer it, an innocent who has some sort of "destiny" or perhaps was just the victim of a bet between a "good" power and an "evil" power who is kidnapped to be seduced to the evil power's purposes.
The Evil: I'd prefer it to be supernatural, and not vampiric. While I can handle the way some people romantacize them, if I'm choosing, I'd rather keep away form the undead, a bit squicky. Either a demonic force or a mage, I don't really care which, as I expect both of them can change form and stuff with magic for their own... Pleasure.
The Motivation: Either the corruption of the target, or perhaps their job is just to keep the woman restrained, and are having fun with her. In any case, I would, again, prefer to avoid pain, tourments will be of unwanted pleasure.
Is this enough, or would you like more details? And if so, please state your preferances for which vein you would enjoy more.