Kozue Tokita, a married woman suffering from long-term sexual frustration due to her husband's erectile dysfunction, accidentally discovers her son masturbating. In that instant, she becomes fixated on his throbbing cock, loses all rational thought, and impulsively pins him down. The son, driven by insatiable lust, shows no sign of slowing down—his stamina is relentless, quickly recovering after each cumshot to thrust into her again with intense, repeated strokes. Overwhelmed by the relentless penetration, Kozue grows increasingly aroused, eventually spiraling into a state of wild ecstasy.