Lindsay Armstrong 
Question Of Marriage 

Aurora poured her most intimate secrets into her diaries, so she was horrified that, by accident, Luke Kirwan now had them! He’d only return them on condition that Aurora agreed to date him.Soon Aurora realized that Luke’s teasing blackmail was thrilling both of them. What if she played Luke at his own game – if he wanted to keep her, he’d have to bind her to him with wedding vows?