Hi I'm looking for a yaoi manga about a man who works in an office and is a virgin, and is very popular but refuses all advances because he doesn't want anyone to find out he is a virgin at that age. Then a man confessed to him and he thought it would be the perfect opportunity to practice withoutv losing face since "guys are different" so he accepted. Then he started to catch feelings and felt guilty so tried to break up but ended up confessing everything.

Update I found it it's the 5th chapter of
"Love letter of flowers"