Perfect Scandal by Molly McLain

She’s forbidden fruit, and he’s everything she’s looking for, no matter what her brother says.
Tessa McMurray is hellbent on proving that her brothers don’t control her. Setting her sights on her family’s ranch foreman is risky. But she knows what she wants.
Dean Langston loves his job, and he refuses to do anything to jeopardize his position. After all, the McMurray brothers are not only his bosses, they’re his friends. When their outgoing and breathtakingly beautiful little sister starts charming her way into his life, he does everything he can to resist her.
But one weekend in Vegas changes everything…
Suddenly, Tessa and Dean are hiding more than their attraction to each other from the McMurray family. Can they afford to gamble with the truth or will their secret force them to lose it all?