I also thought about that. But the story can still continue even if tomo and jun are a couple already because there can be still a lot of complications so the story will still progress. Such as
1. how can Jun act as a boyfriend especially that he is not used to being with girls and seeing tomo as a girl,
2. how can tomo act as girlfriend since she is also oblivious to a lot of things,
3. what will happen to misuzu after tomo and jun become a couple. Will there be a new male character who can be partnered with misuzu?
4. How will the parents of tomo especially her dad react to tomo and jun's relationship?
5. What will happen to carol and senpai as a couple?
Think about Gekkan Shoujo Nozaki-kun, comedy manga usually have little to no progress in romance until it's near the end of the story _(:з)∠)_..
I like this manga so much. But it is now so frustrating that tomo and jun's relationship is not progressing romantically :((((
In my opinion, they should have more romantic development than with senpai and carol.