Good Girl Gone Badd (The Badd Brothers Book 5) by Jasinda Wilder

Evangeline du Maurier is the definition of a good girl. Attending Yale, raised with the best tutors and etiquette instructors, she's expected to toe the family line and be a trophy wife for a future senator. But when this good girl takes a quick getaway to clear her head, she finds a whole lot more than she'd bargained for. She finds herself in the arms of a bad boy.  Baxter Badd.  Big, hard-drinking, and as rough and demanding in bed as he is out of it, Bax may be the baddest brother yet...