A Dogging Adventure

Jim and Karen used to have a wild and intense sex life. When the urge struck no place was too risky or taboo. But now that they're older and after years of marriage, that passionate spark has dwindled. Karen was looking to reignite that spark by going to a secluded area of a parking lot and hopping into the back seat like they were teenagers again. The idea worked, but before long Karen noticed that they were being watched by a pervy peeping Tom.
Being watched added an extra thrill for Karen, and the sex was the best she had ever had. After telling her husband about it later, the married couple decide to go back at night, with shocking repercussions.