Heartless by Diana Palmer

Gracie Marsh grows up with step-brother Jason and step-sister Glory in an affluent Texas home. Jason, older, had left home to ranch and raise specialty cattle successfully. When Gracie's mother died in an auto accident, Jason intends to make sure Gracie is cared for. When Glory's mother dies, he also assumes the responsibility of looking after her. Now adults, Glory has married, and Gracie finds herself attracted to her step-brother and feeling waves of guilt stemming from the horrific first marriage of her parents. This is an enjoyable, explicit, heart-warming story. A quick read. Sandy Penton