We approached two couples on their trip and introduced them to a hot spring facility under the guise of an interview! We had first meeting couples men and women challenge to extreme missions while sitting together in a mixed bath with only one towel! Starting from daily worries and consultations, they gradually became more extreme missions, but while feeling embarrassed and guilty, they exchanged their husbands and entered into an affair sex! They thought it was wrong, but their libido overcame their reason, and they swapped and had raw creampie ejaculation sex instinctively!