Served! (Playing the Field #4)
J.M. Snyder

The next day, Colby and Megan are on a winning streak, advancing through the tournament ranks with ease. When Colby runs into Van and his twin sister Vallery at the tournament, he isn’t surprised—more than half of Wildwood’s population, tourist and local alike, are crowded on the beach for the event. But he is shocked to see the numbered vest Van wears, marking him as a competitor.
A quick look at the schedule shows that if both teams continue their winning streaks, the day will end with Colby and Van facing off through the volleyball net. To up the ante, Van proposes a little wager. Whoever wins their game advances in the tournament, of course, and continues on for a chance to win one of the grand prizes the next day, but whoever loses gets whatever he wants from the winner...