Betting on You by Lynn Painter

When seventeen-year-old Bailey starts a new job at a hotel waterpark, she is less than thrilled to see an old acquaintance is one of her coworkers. Bailey met Charlie a year ago on the long flight to Omaha, where she moved after her parents’ divorce. Charlie’s cynicism didn’t mix well with Bailey’s carefully well-behaved temperament, and his endless commentary was the irritating cherry on top of an already emotionally fraught trip.

Now, Bailey and Charlie are still polar opposites, but instead of everything about him rubbing Bailey the wrong way, she starts to look forward to hanging out and gossiping about the waterpark guests and their coworkers—particularly two who keep flirting with each other. Bailey and Charlie make a bet on whether or not the cozy pair will actually get together. Charlie insists that members of the opposite sex can’t just be friends, and Bailey is determined to prove him wrong.