Ruthless- Sheila M. Goss
Bathsheba Richards has just discovered that she has a half-sister who needs her help. Sheba's long lost sister isn't too happy about their reunion, though, since she has a lot of problems of her own. Sheba's dealing with her husband's boss, who wants her all to himself. After succumbing to his advances, Sheba gets pregnant, and there's no question about who the daddy is, since her husband has been overseas for the past three months.