I have no idea what's going on in that pool and whether I should be aroused or worried by what's going on, but I can't stop reading out of curiosity.
Well, "reading". More like watching the picture and trying to figure out if it counts as rape or not.

I'm guessing they all want to fuck the girl so they are waiting for their turn? Seems possible

Bump. Please translate meijikara scene's incredible yuri posts. I think there are some translations on gelbooru that aren't on danbooru.

They're playing make-believe "mating" and yes, they all want a go at her.

Mejikara's work often involves teens pretending to have sex, or practicing;it is done by dry humping each other. But then they grind and rub so much they get turned on and keep on doing it no the girl.