Also, is it the first time the rest of the class is involved in any way in the story? Maybe now they will be teasing them about it, although that would be something of a departure since this series was almost exclusively these two interacting so far, with occasional Omichi cameo that no one liked :P
I'd like to think the entire school caught on to their flirting a long time ago and is 100% supporting them in secret and getting mad at them taking their sweet time making it official , like us basically :P
Anything where at least one of the characters is comedically in denial about their true feelings despite doing explicitly gay things all the time. Kinda like Hino-san no Baka.
"the_sheep_princess_in_wolfs_clothing" maybe, if we don't want to add the "fictional nations don't count" rule, because it's about someone working in a foreign country to them.
There's definitely more, but I'm struggling to find 'em right now. If anyone else has good suggestions, let me know! I love the language barrier tag a lot, but it's not all encompassing for stories like that =w=
Virgins' Empire would fit, at least all the chapters tagged Elisha x Honoka. Maybe VAMPEERZ? I'm not following it but I recall something like that. This is indeed the beginning of a list.
I thought to suggest it after reading this chapter of My Mom's A Superstar figuring there were most likely many other examples since most of the manga on this site are romance.