Man after Midnight and Embracing Midnight by Devyn Quinn
Vampires as aliens, a rape scene where the woman takes pleasure in the act (and I'm not talking "play" rape with consenting partners), and three men with one woman don't work for me. If they work for you, Quinn's writing is intense and descriptive. You might want to give one or both of these books a try.
They're totally not for me, so I'm not doing true reviews of either book.
WARNING: Extremely graphic sex scenes.
My overall personal rating of Man after Midnight and Embracing Midnight is a C-.