SDAM-016 Couple Swap! Thin Wall! Suspicious Filthy Noises From The Room Over! Hit It Off Double Adultery

Two couples who were called by the project “Please tell me the secret of good friends”. While discussing, an obscene kiss sound is heard from the next room (a sound played by the staff on a radio cassette player to make them feel H and suspicious). While each other’s room became skeptical of the sound, they gradually got into heat, separated by a wall and swapped.