Of course she doesn't realise it yet, because it's not there at all. It's called wishfull thinking and that's all. Plus if I'd have to say that Kurumu pursues Tsukune the hardest out of all the girls. Not saying she loves him more than the others, I think that's just her personality. I'm all for Tsukune sitting on a throne with all girls at his feet. Well Ruby will have a collar with a chain attached, of her own accord I might add...
Whether or not the polygamy thing was thrown as a sense of foreshadowing or just for kicks. Who knows, but it was a funny chapter seeing Tsukune's reaction. The banner was a nice touch as well...
One thing I am wondering on and I didn't see it. Did one of Tsukune's links crack on his locket when he stopped the bird? I don't see the sfx translated so it's unclear...