pushing it in this thread to counter the incest shippers.
Yeah well. I admit, maybe that is why I sort of dislike K/R here. But since Stryp has said this will end strictly A/S, it could be a future for Rei. Or, depending on Kaworu's fate, a potential pain. And in general - "pairing the spares" has always felt a bit... cynical and all too convenient to me.
A case of 'doth protest too much' where she likes him but is in denial. Possibly to herself.
Even then there should have been more indication of that. I mean, yes, as I've said, there's still at least two chapters time, but so far there is no indication, other than a superficial similarity to anime archetypes that quickly melts away under closer inspection (because Rei so far does lack the dere component). And even if that changes... two chapters would be a rather quick development...
As for your Kaworu futures:
He may not be able to just die on non-Angel related business. Didn't Stryp mention something or other about one shot of him showing cut marks on his wrists, indicating he had maybe tried suicide before already? So simply dying on a mission might be impossible. Also, since both SEELE and Gendo patiently wait for all 15 active angels to die... there must be something that prevents Instrumentality while there is still Adam-spawn around. And if SEELE can't start Instrumentality because Kaworu is around, well, they will know he is still around. Which makes hiding that fact impossible (though of course one can still hide
him, physically).
Plus, the biggest question would always be how to make him resist/getting rid of the Call. As long as that isn't solved, anything else, even SEELE, are irrelevant in this regard.
And now we hit a very big question. We know that Rei/Kaworu could result in a Forbidden Union, depending on how far they take things. As far as I know, this creates a godlike, ludicrously powerful being.
Of course, we might legitimately ask what is meant with "Union" here. Seeing how in NGE beings merge or consume each other parts... "union" may be much more literal here than "sex". And I doubt Rei and Kaworu can merge without some ritualistic thingy as seen in EoE... plus what the hell, I don't want to see Rei getting fused into some sort of uber-being!
And the "being" of such an "union" simply meaning a child conceived the old fashioned way - that sounds a bit too mundane to me, considering what we're talking about, and hey, who knows if Nephilim pregnancy is even a thing.
...which incidentally would be another counter to your complaints about "incest". Just saying.