On Christmas Eve, Vince and his wife Marie-Clarence invite all their swinger friends in their somptuous Norman house, as every year, in order to celebrate Christmas with a kinky orgy. This year, James comes with two gorgeous ladies, Tracy and Lina, while Joss arrives with Cherry. Everyone enjoy the reunion when someone knocks on the door. On the front steps, there is a couple of strangers, Gonzague and his wife Ba, whose car broke down in the street. They seek for assistance. As the lady of the house she is, Marie-Clarence invites them to join their party. The shy vanilla couple is far from expecting what will happen...