In the throes of a secret, forbidden lust, a wife's sister sneaks into her brother-in-law's room, pushing him onto the bed, and taking his throbbing cock into her eager mouth. She mounts him, her tight pussy enveloping his hardness as she grinds, their bodies slapping together. Their passion escalates, oblivious to the danger of discovery, until a creaking floorboard forces them to freeze, their illicit pleasure left hanging.