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One day, Reiko, who lives with her daughter's couple, witnesses her son-in-law, Hikaru, being frustrated and indulging in masturbation. Reiko couldn't take her eyes off that huge thick cock... As soon as he knew that his daughter and sexless were the cause, he continued to seduce him by playing with his cock regardless of where he was. To such a mother-in-law's invitation, Hikaru, who has been accumulating sperm on a daily basis, could not resist ... and succumbed. Since then, the two have secretly devoured the pleasures of their families, but...