Unlaced (Symbiotics #3)
Lynne Connolly

Charlie introduces Zara to the joys of tight lacing, and Zara discovers the Big O, but despite that, she won't give in and give Charlie complete ownership. If they weren't married, she could take what he'd given her and walk away, but she can't do that now. She'll stay and fight.
As she learns to master the new feelings he's brought to her, Zara learns how she can use it to bring even greater pleasure to herself and her husband.
Charlie's not ready for the way Zara blows his mind anytime he's near her. Used to controlling his life, even down to the women he takes to his bed, he's not sure he likes losing it so completely. It takes a new kind of bravery for him to face this unexpectedly strong woman.