UMD-688 Couple swap hot spring trip 7

This is the 7th installment of a series in which two couples go on a hot spring trip together on their day off, and in order to break out of their rut, they swap partners. - After the banquet, the unfaithful husbands try to have sex with each other's wives at night in search of a thrill. - A Nakai who saw through this got involved...