A married woman struggles with shame and guilt while fulfilling her husband's wish to be cuckolded. She desires to show off everything during their hot spring trip arranged by swingers club organizers. This time, the target is M month (26 years old), married for three years. Suspicious at first, she eventually agrees after being persuaded by the man. Despite her reluctance, he pleases her body expertly until she reaches climax multiple times under his skilled touch. In the bathroom afterwards, she expresses her longing for further humiliation which leads to intense orgasms through unexplored stimulation using toys. After being penetrated again immediately following this experience, she becomes so absorbed in riding him that she loses track of reality and apologizes profusely upon realizing what happened.