This doujinshi is an extra story that serves a bridge between I Shouldn't Have Gone To The Doujinshi Convention Without Telling My Wife 1 and its (upcoming, hopefully) sequel.

After the fun they had in the first chapter, Yumiko and her horny neighbour go her bedroom where they stumble upon her husband’s doujin that she was using to vent her frustration. He has a brilliant idea: he has her read the doujin dialog out loud. And since it turns out it was a pretty hardcore doujin, you can imagine what happens next~
*All characters depicted in this work of fiction are adults, regardless of their visual representation or textual description, and are not based on any real person*