A secret getaway for illicit lovers known as "The Inn of Adultery." Tonight, another cheating couple arrives, using their personal reasons as excuses for this romantic escape. The moment they check in, they can't hold back and start passionately making out. Since she's on birth control today, creampie is allowed. Afterwards, they head to a private open-air bath to wash off their sweat. But their passion shows no signs of slowing down, moans for oral sex echoing through the air. At that moment, a solo female traveler accidentally wanders into their private bath. She witnesses the couple's intimate act up close. Flustered, she rushes back to her room, but the scene lingers in her mind. Unable to resist, she begins masturbating with a vibrator. However, the cheating husband happens to see her. He then aggressively takes her, replacing her vibrator with his cock. This hot spring inn is truly an "erotic spring," renowned as a hidden paradise for affairs.