Hitozuma Swapping Game

Two young wives play a "king says" game and end up being swapped out for each other.

Okuda Hiroyuki and Shimamoto Shohei have been close friends ever since high school.
One day, Shohei asks Hiroyuki how he feels about swapping his wife for Shohei's own.
Hiroyuki refuses at first, but Shohei's wife Kumi manages to get him interested after all.
However, Hiroyuki's wife Utana is diligent and proper, and she does not care about the idea at all.
Because Hiroyuki knows she is weak to alcohol, he drives her drunk and plays a king says game with her, gradually heightening the erotic atmosphere...