Monster On Your Mistress — Susan Hart

Monster On Your Mistress, is a quirky story about a woman who has almost everything, except her lover -- who's always running off somewhere for days at a time. She knows he's not with his wife and she gets lonely rustling around in her big, country, luxury home. One night she gets locked out of her house while investigating strange noises in the woods, and what follows is something she would never have imagined in her wildest sexual fantasies.