With her husband away on a work assignment, a lonely mother lives alone with her frustrated son. As she is caught masturbating, her son's mind gradually unravels, consumed by intense feelings toward his mother. Torn between guilt and taboo desire, the mother surrenders to uncontrollable pleasure. Forbidden lust swirls between them, deepening their twisted bond. Suddenly overwhelmed by raw desire, the son attacks his mother. Instead of resisting, she exposes her body willingly, embracing the illicit relationship. And with the words, "Fill me up inside, Mom!", the final boundary between mother and son shatters completely.