I don't know how to quote, but
>What's really interesting is that Iino and Tsubame almost appear to both be tsunderes - I really doubt Tsubame would have offered to fuck Ishigami if she didn't at least kind of like him, even if she played it as being a pity fuck.
I mean, duh? I've mentioned before that it's clear that Tsubame *likes* Ishigami, but she feels she can't really let herself fall in *love* because she's leaving anyway and that would be unfair and hurtful. Which is actually a very common thing, being scared to commit to "seriousness" because you know it couldn't be permanent anyway. That's not tsundere, that's pretty much a normal human reaction to a sucky situation all around.
Actually, I think that may be part of why the while Tsubame/Ishigami thing hit so hard? Everyone in it acts like normal people. Almost nothing Kaguya or Prez or Iino or Chika do is ever normal. They're super exaggerated, they're Big with Big Feelings and Big Traumas and Big Moods and they do Big Gestures. It adds a certain layer of abstraction. The Christmas thing, as the vernacular goes, "got too real".