The cockblocking is truly way too convenient and rampant in this manga.
It's also kind of funny how the adults are pretty realistic in this manga, well, only to some extent of course. The most realistic parts about them is that they're not bothered about sexual things. They don't care at all. If they invade on someone, they'd be like "oh, so you're doing it, sorry to intrude, by the way, I'm here but feel free to continue, I'll just go away". If we were to be realistic, the mc and the rest wouldn't be so bothered about it either, it's not that big of a deal, just look at all the people in school who are literally fucking in school without giving a single fuck about what other people thinks.