Summer Wager by Stacey Joy Netzel

Shanna Rogers can’t stand another day working with sexy, infuriating, Kevin Cain, but when they both ask to be transferred, their boss sends them on a team building camping trip instead. Kevin makes a bet with the prissy prima donna he’s certain to win—until she turns the tables on him in a move he never saw coming. Stakes are raised and lines are drawn—but it’s a very thin line between love and hate, and winning the wager could make them both losers when it comes to their hearts.