Called it. (To be fair, it was pretty obvious.)
I wonder what the odds are of "Nanami tells her parents, and with her parents still under the impression that Kaoru is a girl, are fine with it?"
Though I'd probably lay a side-bet on "Mom saw through the whole thing instantly, but Dad is still clueless."
Edit: I forgot. They met Nanami's Dad two chapters ago, and he's under the impression that Kaoru asked him if pursuing a relationship with Nanami was okay with him, and Nanami's dad said "Yes." So the odds are 100%.