Mariko, who is sexless and frustrated with her husband, was secretly comforting herself in her agonizing days. One day, I learned that my son-in-law, Shinji, who lives with me, is secretly masturbating for the same reason as her. Mariko, who was fascinated by the non-standard big that she happened to see, told herself that it was to vent on behalf of her daughter, and continued to secretly seduce him if there was a chance, regardless of day or night. And Shinji can't resist the glossy scent that oozes from his mother-in-law, and he continues to be tossed with a meat stick many times.