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Aika, a mother who lives with her husband and her son, Junya. One day, Junya broke his arm in a fight with a friend, and Aika begins to take care of his son who needed help. However, Aika becomes conscious of the body of her son who is growing up to be an adult from time to time, and involuntarily teaches his innocent son's cock. Then Junya couldn't control her interest in sex ... Aika felt responsible, and this time she taught herself the color of sex with her own body as a mother ...