I don't remember the title, so I can't find it anywhere. I remember that there are about 5-6 chapters and the main characters are rivals who turn lovers. The uke is a member of the sports department and is the more popular of the two. The seme is in the cultural department and has something against the other guy. One day, the seme offers to teach the uke some tricks in order to avoid embarrass himself when the time comes, despite him being a virgin himself. As time goes by, they fall for one another.

Do you know the name, please help?!

Junketsu Drop?

It's the Art of Time, it's the Art of Life--
Of the player and the craftsman,
Of the writer of songs, of the creator of love,
Of those who will follow, of those who led,
There's no other way in the world ahead ♥

Yes, thank you.