https://www.dlsite.com/books/work/=/product_id/BJ01011356.html
As always, please support the artist and buy his works.

NTR camp for all adulterers: How can an innocent wife moan and cum with another man?

I am newly married for 2 months and I have a problem. My wife and I are having trouble having sex because of my big dick....
Then, Kumiko, my female boss, invites me to go camping with her and her husband. Kumiko and her husband originally introduced me to my wife, so it was a good change of pace for both of us to see each other again after a long time.
But then... Late at night, the wife sneaks out of the tent and finds herself in the woods with Kumiko's husband, having a hardcore fuck! I had never heard such a gasp, such a lustful expression on her face.
I was so angry and sad that I lost all reason and snuck into Kumiko's tent and stripped off her clothes!
Kumiko resisted at first, but when I screwed my hungry cock into her, she said in ecstasy, "I've never had a cock this big before...!
Kumiko begins to moan in ecstasy.... What will happen next in the adulterous camp of cuckoldry and extra-marital affairs?

MC had a crush on Kumiko but she got married. Then they introduced Saori to MC and they got along well and married.
Why Saori cheats? Well, this is a rare case of MC having a big dick it can't fit in her pussy so they have issues with this.
On the other hand Kumiko's husband found out Saori had a crush on him back then un college so he used her lingering feelings and hunger for sex to make her give in into sex with him.

MC quickly caught them and while he was hoping Saori would reject Kumiko's husband she didn't so he angry and sad went back to the tents and raped Kumiko, she also didn't resist much because she is in a sexless marriage with her husband.

Base +18, Fofotron +7, Arsinis +6

As always, thank you for the synopsis and upload :)

Base +19, Fofotron +7, yupokamusi -8