It's a manga I read some months ago. I pretty sure didn't finish it as I found it boring, though (wanna read it again). School life shoujo. I recall a scene, though;
Main couple is dating, they're in different classes, teacher of the female lead asks someone to go to the other class to get a CD (?) back, main girl's friend has to go there, asks teacher if she can bring fem protagonist as her boyfriend's there. Goes there, fem lead stays on the door as dumb classmates constantly wink the male lead saying "Yo it's MaleLead girlfriend, cute".

Have you tried checking your internet history to see if you can find the title?

Do you recall any other specifics? Cause the scene sounds super generic.

Try Nagareboshi Lens

Yeahh it was Nagareboshi Lens!! Thanks!