This is probably more of a 3.5.
Uber-alpha hero; somewhat sassy heroine in trouble; and lots of sex with the same dialogue and 'pleasure pain' running through it.
I did like the story and the fact that the heroine wasn't totally submissive to the hero's personality. She did argue a bit with the hero during her 'blackmail' relationship. But, there was the obligatory 'I'm going to do something I was told not to do, because what kind of harm could possibly come to me in the middle of the day' scene.
The 'bad guy' is apparent from his entrance in the story, so there was some predictability. Of course, intense-out-of-control sex throughout the entire story.