Besieging His Lady — Sarah Winn

To get the land and title he's long sought, Sir Martin le Werre must marry the widow of a recently deceased baron. Although Lady Gwyneth is young and beautiful, years of marriage to an abusive husband have left her cold and unfeeling. Martin's best efforts fail to melt her iciness. Then he finds the whip her former husband punished her with and uses it to make her forget pain and embrace pleasure.