Intimate Nurse by Kimberly Kemp

Her treatment went far beyond her duties--beyond decency, too.

From the back:

Beautiful, statuesque Frieda was bred as a sleep-in nurse to service an entire household. This she did with a skill and gusto that left everyone breathlessly satisfied. Her bedside manner was all to be desired by men — and women. But Frieda had a plan, and what she did with her fantastic body was just a part of that plan