Yuna, who'd been sexless and frustrated lately after discovering her son's friend, Kosuke, was masturbating with her as his target, starts secretly sneaking in some action with him. However, Kosuke's relentless, insatiable cock, capable of multiple orgasms without tiring, proves to be too much to handle. While Yuna initially enjoyed being fucked daily, she gradually feels her limits approaching. Even as Kosuke continues to drive her to her peak, her body finally cries out in agony, reaching its breaking point.
