https://www.dlsite.com/maniax/work/=/product_id/RJ01357324.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_546482/

[Synopsis]

Ryota Saito was enjoying his days working in the same sales team as Akira Fujise, the man he fell in love with at first sight when he joined the company.
However, one day, Matsumaru Kaoru joined the company midway and cracks started to appear in his peaceful days.
Meanwhile, Saito was infected with COVID-19 and had to stay at home for a week to recover.
Just as Saito feared, Matsumaru takes advantage of Akira's mistake and uses his smooth talk to get close to her.
Akira is gradually overwhelmed by Matsumaru's abnormality.
Before he knows it, the positions are reversed and they finally cross the line.
Akira's masochistic nature gradually blossoms as Matsumaru's passionate sex continues.
And every day, Saito receives videos of him sleeping.
What will become of Saito's mind?!
The story moves towards an unpredictable climax...

Base +28, Fofotron +26, nuts987 +13, blaqkthespian +6, STAR-KNIGHT +6, xinmao +7

The twist is Kaoru died of COVID lol

Base +23, Senpai SAP +6, xinmao +7