A mother whose anus was violated for her son - A virgin Kikumon trembling in agony

After losing her husband and raising her only son, Takahiro, on her own, her mother, Aoi, is unable to earn enough money, and has given her body to her boss, Onuki, where she works, to help raise her living expenses. However, perverted Onuki is not satisfied just by holding Aoi, and begins to become interested in her asshole. In order to survive, Aoi continues to be played with her anus every day, as she is told... And finally, her anal virginity is taken away and she reaches a deep orgasm. Seeing this, Onuki sought even more excitement and came up with a plan...