Yumi, who lost her husband in an accident and raised her son Yasuo alone, remarried Kazuma, who proposed to her knowing she had a son. The three of them went to the beach for a swim. However, Yasuo did not accept the remarriage and, as if to show off that his mother belonged to him alone, buried his face in Yumi's crotch as she slept on the sand and ran his hands over her voluptuous body. And still unable to control his desires, Yasuo inserted his penis into his mother's ripe vagina. On the gently lapping shore…