Four Sworn - Delilah Devlin

Sometimes it takes a cowboy, or maybe four, to unleash a woman's wild child.
Being the pretty daughter of the town whore was reason enough to ensure Shauna Davies lived a circumspect life, stepping out of line only occasionally with her favorite cowboy, boyfriend Bo Crenshaw. But her untamed spirit is forcing her to make a new start in another place where no one knows her past — but not before she fulfills one last wicked fantasy.
Cowboy Bo Crenshaw has loved Shauna since they shared their first sexual adventures as teenagers, but he hasn't found the way to show her he accepts the wild child she keeps hidden inside — at least, not until she confesses a long-held fantasy. Now Bo is determined to give her a send-off that will make her think twice about blowing out of town.
Hoping he's found the key to unlocking her heart, he turns to the Kinzie brothers, his three closest friends, to provide her a single night of unrestrained passion.