I only read one or two volumes of Fruits Basket so I never got the full Tohru innoculation. I'm with Sephiroth on this one.
And this line: Only the lingering insistence that he was now by default the most sane person left in the conversation kept him from turning around and availing himself of that crumbling wall.
That was the one that broke me. You'd summed it up admirably before, but that's the one that got me from silent giggles to full on, frighten-the-cats, husband's-staring-at-me, be-glad-the-baby's-with-grandma laughter. Excellent job. :D