Unforgiven - Delilah Devlin

One lonely cowboy's revenge was never so sweet!
Cutter Standifer is a man with a rigid personal code, who's having trouble "acclimating" to the fact his little sister is marrying one cowboy and shacking up with a second. That the man she's marrying is the same one who shattered his world a year ago isn't something he can get past. Forgive and forget? Like hell. Not when he lost the only woman he ever loved.
It's been a year since Katie Grissom shared the same air as Cutter, but she can tell he's still simmering with anger over her betrayal. However, she's been praying for a chance to make it up to him, so when Cutter offers her a no-strings affair, she jumps at the chance, hoping to either break through the rigid wall he has built around his heart or get him out of her system for good.
When Mother Nature complicates their arrangement, she's scared he'll do the right thing for all the wrong reasons. Now, she may never know whether she's truly forgiven or whether he'll ever learn to love her again.