Spunky Seniors 2 - Spunky Seniors, #2

Spunky Seniors is a series of stories about horny older women. In the second story, Margo's husband, Frank, chastises her for minor misdemeanours by tying her up, spanking her and buggering her. She hates this at first but grows to love it and then realises that Frank only uses punishment as a pretence to get what he wants. That has to end as they want to start a family but once their son is born their sex life ends almost completely.
Margo doesn't want to cheat to make up for her lack of love, but then she meets Dave.