Wow, now that was quite a story. 4.5 stars for it.
It's a gripping story. I wasn't sure what to expect as I read but what I found on the page was quite exciting. It wasn't your every day story of a whore picked up from the street and taught the ways of love by an alien species. Or better said, this idea is present in the book but hidden under so many other motifs it hardly gets any attention.
As I said, not a light BDSM reading. But the characters, the story and the slow way in which they come together is well worth the read.