Love Me Knot by Shelli Stevens

Ciara came to Wyattville to reconnect with her half-brother, and use up extra vacation time in the small beach community. What she didn’t planned on was throwing her inhibitions to the wind and falling for a complete stranger.
Ryan Wyatt spends his days serving in the Coast Guard, and his nights flirting with the ladies. He’s the last Wyatt bachelor standing now that his cousins are married. When he meets Ciara he wonders if that’s about to change. Until he discovers she’s the sister of his enemy and then his plan for seduction becomes tinted with vengeance.