Turn Up the Heat (Turn Up the Heat #4)
Marie Harte

Every time Cass sneers or jeers, Mack likes her a little bit more. For a firefighter, he's a laid back guy in a profession that takes a lot of heart. Though he's used to handling the heat, Cass makes him burn. But they both have concerns about their families and their futures, and Mack and Cass will need to decide if they should fan the flames between them or douse what might have been before one of them gets burned.