SDMU-450 — Four Amateur Couples Betting 1 Million Yen On Serious Sex In The 1St Erection Duration Contest

Erection... it's a physiological phenomenon that occurs when a man gets excited. It's difficult to suppress, let alone keep it standing. However, when their beloved girlfriends show off their sexy bodies without worrying about the camera, the men go beyond their limits! Blowjobs, titty fucks, hand jobs, sex, and even swapping! Four couples compete in a serious battle for a prize of 1 million yen!