Well of course it represents a mountain. And as a mountain represents endurance, it means, that Rinnosuke is being more and more stubborn about not letting them stay there...
His pants. His pants are the tent, and the pole is, well his pole.
Like hell I am!That's exactly right!Come on, Marisa...just a little more, and you can persuade Rinnosuke, okay?Oh, yes. And as proof......Rinnosuke's already pitching a tent in his crotch!R-...really?