The Bet by Christina Quinn

Gemma Vecchio, a snarky woman with a biting wit and a soft spot for her friends, finds herself a fish out of water when she takes a two-week vacation to a singles event at a luxury resort. Not one for relationships, Gemma’s sole purpose for going is to get her best friend Sarah to forget about her freshly finalized divorce.
After a night of disappointing sex, Gemma meets with Sarah, who bets her two thousand dollars she can’t stay with only one guy for the rest of their vacation. Never one to shy away from a challenge Gemma accepts. But can she survive the trip with her cynicism intact, or will this sexy game of hearts get out of hand?