Suzuka is a housewife with a college-aged son. She has a good relationship with her husband and lives with her family of three. One day, after her son goes out, she is having sex with her husband. However, her son comes home and sees them in the act. That night, Suzuka is cleaning up in the kitchen when her son comes in and drinks some water. Suzuka wipes up the water that had spilled. Seeing her butt, her son becomes excited and pushes her down. Suzuka resists, but is aroused by his intense hip thrusts. Afterwards, unable to forget that day, Suzuka sneaks into her son's bedroom...