Big, Bad Lawyer by Lana Lachlan

His tastes run on the darker side. The entire floor of the law library usually belongs only to Ophelia at night. But after a chance encounter there with her best friend’s boyfriend, Jack, she knows she must stay away from him. Jack is an experienced Dom, and this little spitfire is not usually his type. But when Ophelia steps up to his challenge, he’s more than intrigued. Who knew a trip to the library could result in a tryst that will change their lives?