Kashidashi Tsuma, Mayumi no "Netorase" Houkoku Binkan Tsuma to Furin Shucchou

The protagonist, Kousaka Yasutomo, stumbled upon an online post one day.
It was a story about someone letting another man sleep with their wife. Intrigued, Yasutomo couldn’t stop thinking about it.

His wife, Mayumi, had only ever been with him. What would it be like for her to be with another man?
The thought spiraled into a full-blown fantasy, and eventually, he couldn’t hold it in anymore. He confessed his desire to Mayumi.

At first, Mayumi refused. But Yasutomo’s persistence wore her down, and she finally agreed—on one condition.
“Only if it’s a man I trust…”
And so, the person my wife chose as her "loanee" was her one-year-younger, divorced boss, Shinkai Satoru—the only man she trusted besides me.
Since Satoru often went on business trips, that’s when the "loans" would take place.

The forbidden Affair Business Trip Sex.
What kind of intimacy unfolded between the two of them?
I wouldn’t know until my wife came home.