I'm trying to recall the name of a certain series I read a long time ago. I think it was a 4-koma series, at least some of the chapters were. I don't remember much, except this one chapter where two schoolgirls who are dating have a long make-out session in the bedroom of one of them.
It was like this: the shorter girl, who is a bit of a burikko (refers to herself by her name), invites the taller one to her place, and when they are in her bedroom they get on the bed and start kissing. It's their first time doing it, and they keep at it for most of the chapter, all the while thinking about the effect the kisses have on them: the sensations, the feelings, how exciting it all is, and so on. At the end, the burikko says: "So-and-So (her own name) loved this!" The other girl tells her that, next time, she will give her an even more stimulating kiss; and the burikko cutely replies: "If it's more stimulating... So-and-So will faint. ♡" And the other girl almost explodes from the moe overdose.
I feel like reading it again, but I really can't recall the name of the manga...