So I am the first one to read your story and give an opinion, it seems. Well, here goes:

In the beginning I wasn't too happy, because it seemed like a rape story and I feel rape is too serious even to be considered in stories. But you explained the background quite neatly later, so that problem seems laid to rest.

Other than that I loved it. You took us right into the action, but still set up the situation nicely. I'm really curious what is going to happen to the heroine next.

The thoughts of the heroine are described well, too. I thought her reaction a little on the cool side inititially, but as she turns out to be a submissive at heart, it sounds more natural.

The man is sufficiently mysterious to keep him interesting, but his movtivation is human enough to make him believable.

Ther is only one small suggestion I have to make. Go through the story again and check your verbs. You did slip from the past to the present a couple of times.

Please continue the story. I for one want to know what happens next.