Descriptions:
Swapping partners for sexual intercourse [swapping]. When the couple’s sex life had fallen into a rut, they were approached by a junior colleague about swapping. Mr. and Mrs. Minami were reluctant to try it, but when they tried it, they found that “their husband was having intense sex with another wife…” They were emotionally shaken by the situation in which their beloved was having passionate sex with someone other than themselves. The story is about the exchange of four people who are madly cumming.