Tomoaki, who married into the Maki family as a son-in-law, had always admired his beautiful and impeccably skilled mother-in-law, Kyoko. But one night, upon discovering her husband's infidelity, their relationship turned into a sham marriage. Kyoko, still in the prime of her femininity, gradually begins to feel unfulfilled. As a result, Tomoaki unintentionally finds himself reaching for Kyoko's huge breasts. Through humiliating bedroom games and creampie sex within the household, Kyoko slowly transforms into a busty, cheating dutch wife exclusively for her son-in-law. The shifting emotions beneath the surface and the deep-seated desires hidden within their affair are what make this work truly compelling.