Kyoka is cleaning the bath... Her clothes are wet and transparent... Her son, watching her, becomes aroused by his mother's wet and transparent body... Kyoka initially refuses, but her son's persistent caresses and his obsession with her ass gradually loosen her anus, and she feels the foreign body sensation turn into pleasure. Her son takes out an adult anal toy and caresses Kyoka's anus and vagina with two of his penises... Kyoka writhes in anal pleasure as she offers her son's erect penis to her anus.