I'm still going back through the older comments at the nomination post. Way back when, someone nominated "Syncopation" by Lilla Vaughan, which I wasn't that crazy about to be frank. I don't remember why. But then I remembered she'd written this fic, which I do like a lot.
In her summary Nanda writes, "I think the title speaks for itself. Oh, and there are rocks falling from the sky, too."
The link is to AO3 but this fic can also be read at Gossamer.
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Your Platonic Relationship: An Owner's Manual