Hello 😀
I'm, as said, looking for a yaoi manga which I cannot seem to find again...
Here's what I remember about it:

1. It's a school setting, with seme being a senpai and uke a kouhai;
2. The seme is a part of student council and really smart, while the uke is a chosen spokesperson for the sports department (he might've been playing tennis in it, not sure);
3. They dislike eachother a lot at fist, due to uke not attending some meatings seme is chasing him around for;
4. After a while, read couple of pages, seme helps hide uke from his fangirls, discovers his shyness when faced with anything sexual and begins to pleasure him repeatedly- when the uke is eager to reciprocate, seme goes all 'no, no';
5. Not sure if it's a manga for itself, but pretty certain it's a two chapter or sth part of some other manga;

Will be eternaly grateful to whoever helps me rediscover this manga!!! 😀 😀 😀

Oh yeah, 6) Uke's a bit tsundere-ish!

It should be Junketsu Drop =3