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The ending of this chapter has a montage of the 1st 2 couples in the series, and when the MC from the 1st 2 chapters comes home to find his wives having lesbian sex, he joins in.
2 x 1 ~Kou Joseiritsu Shakai de wa Tsuma Doushi no Naka ga Yosugite Mondai ni Nattemasu~ – Chapter 9