Young couple discovers stepmom in compromising position and joins in for a wild group encounter

It's a cozy Christmas evening at the young couple's place, with their attractive stepmom staying over. As they settle down for the night, they overhear some rather interesting noises coming from the guest room. Intrigued, they decide to investigate and find their stepmom in a rather compromising position with an older man, their mother-in-law. Shocked at first, the couple soon realizes the excitement of the moment and decide to join in on the action. The older man, a close friend of their father-in-law, is more than happy to oblige. The room heats up as the group of four engages in a wild and passionate group encounter, leaving no desires unfulfilled. The following morning, everything seems to be back to normal, but with a newfound secret shared among them all.