It's not that I want to fall in love

Miyagawa, an office worker, has never been able to forget the "one and only time he had sex" back when he was a student.
Since then, he has spent nights with various partners, but without ever experiencing the same pleasure he felt that day, six years have passed before he knows it.
Then one day, Kuroda, the man who gave Miyagawa that unforgettable experience, transfers to Miyagawa's company.
Miyagawa is thrilled to be reunited with Kuroda, who was also his friend back in their student days, but Kuroda doesn't seem to be happy about their reunion "just as friends"...?

Source: CMOA, translated

Notes

Includes one extra chapter