part 2)
Its mostly correct except she cannot escape implies being chained up or something, its not a sensual novel(only one part of it), and there is no demon that thirsts for her blood. I think the summary was written like that to appeal to a certain audience. I do not want to ruin too much of the book, but its about a woman who prefers to live a secluded life, as much as possible in the city. She's sought after by her father's family. She never knew him. The story is how she eventually meets the family and what happens. Its no explicitly horror. Dark fiction perhaps? There's a supernatural element, but its not a huge part of the book, but underlies throughout the book. I can't say exactly why I thought you might like it. Possibly from observations I've collated in my brain somehow. Shrug. I like to recommend things if something seems, to me, something someone might like.

(Part 1, message too long apparently)

No, mentioned in a post. Sorry I didn't see this until now.
It was a book called Dark Dance by Tanith Lee.

This is the summary from goodreads.com:

"Award-winning fantasy author Tanith Lee breaks into the horror genre with a compelling and sensual vampire novel. Rachaela worked in a bookstore, a conventional young woman, living a conventional life. Then they beckoned, using a variety of ruses to lure her to the house by the sea. Now she is a prisoner, part of a family of creatures she cannot escape, lover to a demon who thirsts for her blood."

Boss, I have been having so many tech problems lately. You can't private message me cause I can't access my email. I noticed your post on your wall about the book by tanith lee. If you meant to send that to my wall...I never got it. You should be able to visitor message me. The book sounds like something I should check out.

No Boss, I didn't see a book recommendation...did you post it to my page?

Thanks for accepting!