https://www.dlsite.com/books/work/=/product_id/BJ206303.html
https://www.dlsite.com/books/work/=/product_id/BJ01323331.html (English)
https://coolmic.me/titles/3215 (English)
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I’ll Still Put It In, Even If You Refuse. -Late Night at the Office... Having Sex While Working Over-time.

He uses his fingers to rub over the underwear on the best feeling spot. Slowly teasing, her vagina becomes soaking wet... "Don't take it off... Continue like this..."
Taizo Momose, A salesman who's only selling point are muscles, and Mikuni Hayakawa, a free-spirited designer. They've be tasked with designing new underwear, but they have trouble with butting opinions. While working over-time late at night, a small mistake causes Taizo to accidently spill coffee on Mikuni.
"Hurry up and take it off!" In a panic, he undresses Mikuni, but he becomes strangely turned on by seeing her in her underwear...!
Before long, with the two of the alone in the office, the sounds of hot moaning begin to echo...

"I'll Still Put It In, Even If You Refuse."

You mean rape? xd

Base +15, darkwing42 +53, errata +14, anonymousMember +6, sligy +9

Yeah, that title is really misleading. Thirsty boss girl didn't refuse at all. Maybe it makes sense in future chapters.

Base +7, liberius +6, errata +14, sligy +9