Big breasts mother and son's parent and play human dock play

The movie features a group of mothers, including Sawa, Hinami Miyazawa, Rina Kawana, and Kimika, who are all participating in a unique medical experiment with their sons. The sons, including Taka-chan, Masato Kawana, and Takashi, are all aspiring to become doctors and are gaining hands-on experience by examining their mothers' bodies. The movie showcases an incestuous theme, specifically focusing on the mother-son relationship, with the sons performing medical checks on their mothers, including breast exams.