They had no good reason to reveal themselves like that,
I'm afraid this can only mean one thing:
Fillers ahead!
Otherwise... There are only 13 chapters in SM and 14 chapters in SMR. They'd just run out of material.
...Wut?
I mean, the girl is clearly too drunk to be able to act responsibly. Is she even aware of what is she doing?
What does the guy do? Offer her help transporting her home? Help get get sober?
No, he drags her to somewhere they'd be alone to start making out with her
Well, he is in the same 2 grade of high school as Ranma was, so I think we can excuse him... There's only 2 years of difference between them.