In this taboo family affair, an innocent German family dinner descends into a depraved sex orgy. The scene opens with matriarch, Helga, tastefully posing in lingerie at the dining table while her husband, Gerhard, ogles her from across the room. Their son, Fritz, returns home unexpectedly, catching them in the act. Instead of being shocked, he joins in and starts eating out his mother's pussy. As they switch between oral and anal sex around the table, their daughter, Greta, walks in wearing only her school uniform and high heels. She hesitates for a moment before stripping off her clothes and joining her siblings in a menage-a-trois. The scene escalates further when a group of hardcore swingers arrive at the house, led by their kinky blonde hostess, Ingrid. They engage in various activities to pass the time.