Momojiri no mikoto, the mother of Toyomitsu's big buttocks

Takuya, the eldest son who witnessed her mother masturbating while looking at erotic books. Takuya gets excited about her figure and becomes a physical relationship with her mother. Since then, Takuya has become awkward about her relationship with her mother, and when she tells her brother everything, the younger brother becomes hesitant rather than going on a consultation, and stops at her mother's place.