https://www.dlsite.com/books/work/=/product_id/BJ437891.html
https://www.dlsite.com/books/work/=/product_id/BJ569968.html (English)
https://coolmic.me/titles/2176 (English)
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Work-at-Home Clerk, Cums on All Fours! Impatient Delivery Sex

"To think he'd make me cum at a place like this...!"
Drenched from extreme orgasm at the front entrance... The remote office worker Naho has takeout for her meals, and a certain tan and muscular delivery man has been interesting her lately...
One day, while receiving her delivery, she accidentally spills juice all over the two. The delivery man, unable to resist his lustful urges, kindly starts stimulating Naho's sensitive parts... Causing her body to heat up and react lewdly.
She was made to get on her hands and feet while he teased her privates with his tongue...
"I can't hold back anymore...!"

English WEBTOON version (Complete): https://comiko.net/series/126247/work-at-home-clerk-cums-on-all-fours-impatient-delivery-sex

CHINESE translation (Chapters 01-07)

Page 11 "Am I getting aroused....getting touched by a man...?"
Why did she say that like a lesbian who is surprised to discover she's bi? She was commenting earlier she wanted to see his muscles.

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