I'm definitely rooting for the Sakurako/Nakano/Nagisa triple, because it'd be sad for one of the three to end up getting kicked out despite their feelings. It looks like we're starting to see their relationship start to evolve out of extremely horny kinda-friends, so whatever happens it's going to happen soon and hard, I suspect. It'll be nice to formally declare boundaries one way or another though, because the current model's clearly just awkward for everyone.