SW-1037 Ikumi Shiramine, Nonoka Akari

Three couples arrive at a hot spring inn for a neighborhood association trip. A seemingly reserved, middle-aged couple is invited by their sexually adventurous neighbors to engage in partner swapping. In front of her husband, one wife is presented with another man's penis and eagerly takes it. The excitement of watching her husband with another woman, combined with the thrill of being watched, doubles the pleasure of intercourse with a different partner. The wives become engrossed in sex with men other than their husbands, whether in the bath, the hallway, or under the futon.