Jessie's Child — Lois Faye Dyer

ENEMIES...
Their lies sent her brother to jail and broke her grandfather's heart. Which was precisely the reason Jessie McCloud couldn't tell her family the truth about that terrifying night in her past -- how fear had sent her straight into the arms of one of the hated Kerrigan men...

...AND BEDFELLOWS?
Their encounter four years ago was just a momentary lapse, and hell would freeze over before he'd contact Jessie again. But Zach changed his mind after he came home and discovered her lie. Every one of Wolf Creek's townsfolk knew better than to stand between a Kerrigan and his own flesh and blood. All except for the woman who denied him his son...