Couple swapping NTR: Witnessing wife's shocking affair with her friend from the window - Rinrin Kinoshita JUL-302

I've been married to my wife, Rinko, for five years, and with our cohabitation period, we've been together for ten years, though we've been sleeping in separate beds for a year now. Around this time, the Uchimura couple, who live in the same apartment building, invited us to a barbecue. While drinking and chatting, I brought up the idea of swapping wives...