Kasumi relieved her daily sexual frustration through phone sex with her husband. But one day, her son Takuya whispered, "Dad wouldn't be cheating, would he?" as he groped her large breasts. Starved for human touch, her body mistook his hands for tender caresses. From then on, even during phone sex with her husband, she began accepting her son's body, seeking emotional and physical fulfillment. Her feelings gradually shifted, giving way to a new, forbidden desire.