His Rules — Toni J. Strawn

Abby Harkness has been burned by love before -- finding your fiancée is sleeping with your sister kind of does that to a girl. To avoid further hurt, Abby turns sex into a full contact sport, to be played by her rules. And her most important rule? One night only. Everything is working to plan until she lets Marcus Brookhein under her defences. Marcus is competitive to the core and he will bend the rules to win Abby's heart. It's all out war, and it's about to get dirty.