https://www.dlsite.com/books/work/=/product_id/BJ171672.html
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Slowly inserting himself into his friend's mother [separate volume edition].

"After slowly penetrating deep inside, try thrusting a little bit faster..."
The pleasure of the wall of flesh enveloping me in the normal position made my virgin dick unable to hold back my ejaculation...?
I had been secretly lusting after my friend's mother's ample breasts, which I could see through her clothes, and happened to see her naked in the changing room.
I happened to see her naked in the changing room. The soft flesh around her waist. The dark bush on her lower abdomen hid her secret flesh....
I couldn't keep my reason any longer and hugged her as it was...?
This is a short story full of eroticism of the female body!

Yes, but censorship is ruining the experience! And the author could have explored positions that showed more of her body. Anyway, thanks for sharing.

Base +14, Fofotron +9, yupokamusi -8

p.08 glass dude calls her mother with meaning step-mother, so this is friend's step-mother.

Base +8

I'm thinking Takao (the son with glasses) regularly fucks his step-mother and is also fucking Yuuta's mother.

Base +16