In all cases like these, why not just stop the girls entering before anything happens? It's not like the typical scenario when it happens at a bath and everyone's already naked or wearing a towel. There's plenty of time for her to tell them, "Hey, there's a guy hunting bugs in there, you might want to wait a bit."
People will get pissed regardless of who gets chosen so the author will probably choose no one in the end like
When all characters have fans, a lot of fans are going to be disappointed.
And I thought that one had a main girl for an obvious conclusion... although I've not read the last many chapters, so I'm not sure if anything happened.