https://www.dlsite.com/books/work/=/product_id/BJ01287455.html
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Married Woman's Hidden Affairs [with e-limited bonus]
Mommy-san, Are You Okay with Night Crawling ~I'm moaning and cumming again and again to a foreigner's big dick!

"Mama-san...be quiet. If you speak too loud, everyone will hear you.."
-Their only daughter is in love with a handsome foreigner, Roberto, who suddenly decides to do a homestay with her!?
When she tries to wake him up after he falls asleep on the sofa at night when everyone else is asleep, he suddenly hugs her...!
"Mommy... just a little longer... just a little bit like this..."
Roberto is sweet like a child and pushes his hardened cock against her pussy... Her married body tingles with intense pleasure that she hasn't felt in a long time!
"Mommy's here... it's so hot and warm..." and Roberto's cock forces his way in, but she lies... "Is it this thick and big...? No... no... I can't because you're begging me... I must resist..."
However, he is forced to cum inside her... She is reduced to a prison of pleasure and lust that she cannot tell her husband or daughter about, and Roberto's training further escalates...!

--Also includes newly drawn illustrations!
～This work is a collection of episodes 1-8 of “Mamasan,yobai ha OK desuka? ~ Zetsurin Gaikoku Hito No Gokubuto | Mommy-san, Are You Okay with Night Crawling ~I'm moaning and cumming again and again to a foreigner's big dick!"
Please be careful not to purchase more than one copy.

This one has somewhat less censorship than the serialized version

这..这不对吧 咋满眼圣光的!

Base +6