https://www.dlsite.com/books/work/=/product_id/BJ303056.html
As always, please support the artist and buy his works.

XL's adulterous piston from behind while on the phone - Lewd sex of a serious married woman

"Adultery is wrong...!"
Maho is a housewife who is loved by her husband and has a smooth sailing married life. One day at the dry cleaner where she works part-time, she sees the manager and a part-timer having hard sex in the back of the store.
She is shocked to see the usually brusque store manager pistoning her hard, and at the same time, it stimulates her hidden desire to have stimulating sex just like in porn....
She runs away, and as she prepares to leave, she is approached by the manager, "You were watching me earlier, weren't you?" the manager calls out to me.
In no time at all, she is in her underwear and her pussy is being played with.
"It smelled naughty..."
Her body accepts the pleasure even though she knows it's wrong, and her body begins to wake up to her true desires...!?

English Webtoon version: https://comiko.net/series/126284/fucked-with-a-giant-dick-from-behind-while-on-the-phone-a-serious-wife-s-filthy-sex