Yuu's excessive love for her son led them to become involved in a romantic relationship. Now living apart, the two were planning a mother-son hot spring trip they had previously considered. The reunited mother and son were sure to have an intense, lust-filled time. However... Upon arriving at their destination inn, Yuu quickly led her son, who was trying to touch her body, to the open-air bath. The two washed each other's bodies and played with each other in the open bath. Gradually getting heated up, Yuu ended up taking her son inside her. After spending a highly satisfying time, as Yuu walked down the hallway, she was suddenly stopped. The one who stopped her was an ex-boyfriend from before Yuu met her current husband. Shocked, Yuu's hand was grabbed, and she was suddenly hugged and started to be touched. As Yuu resisted, he whispered in her ear that he had gotten excited after seeing Yuu and her son's lewd behavior earlier, continuing his caresses. He then exposed his lower body and made Yuu perform oral sex. Late at night, as Yuu slept, the ex-boyfriend came knocking. Unable to resist, Yuu's sensitive area accepted him. Unlike her son's, the intense thrusting made Yuu let out moans of pleasure and reach climax...
