Kiss Me Again (Kiss Me #2)
Margaret Moore

Francessa makes a counter wager: she'll break his heart in six weeks. She then seals the bet with the most mind-boggling French kiss Brix has ever experienced. Who knew Fanny could kiss like that? Who knew she knew how to kiss like that? Good God, wherever did she learn to kiss like that? Poor Brix! Poor Fanny!
They're so busy trying to pretend they don't have any feelings for each other except anger, and yet they keep kissing. Again and again and again.