^ That's also what I think.
Now about "Because, my dear sister, you are irredeemable fakes", I posted in the first page (before the fan-service hate attacks) that Koyomi believes that her sisters are not serious about justice, and that for them it's just a game, therefore their sentiments are fake.
BUT! I am absolutely certain, that despite now the above explains why Koyomi would say that, it will take some other meaning later, like feeling/heavy, lost, wandering, etc. did in Bakemonogatari.
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