Reiko had a beloved son who had been hospitalized for a long time after a traffic accident. Although he was finally released from the hospital, he was forced to live in a wheelchair as he could only move his left hand. Reiko lovingly and devotedly looked after her son, but her excessive motherly love made her feel sorry for her son's bulging cock, and instead of using her immobile right hand, she used Reiko's thin, white fingers to satisfy his desire. Their relationship, which had once crossed the line, escalated with each passing day...