I loved how Brianna wasn't afraid to try anything to get her proper husband to lposen up and lose his control. I loved how Colton was so damned confused by his feelings, which went against eveything he thought he should be as a duke.
The only reason this gets a 4 instead of a 5 is because of the misunderstandimgs about how Coltthought she was having an affair, and how easily it could have been cleared up if she had only shown him the book. But then there'd be no real conflict, and no way to get them back together.