Found the Yuletide (old archive) and poked around until I got a page with the three Moon is a Harsh Mistress stories from 2007-2008. Those seem to be the full selection from Yuletide. I'd guess the comment above is about the middle story, "Some Origins of the Fire," by Livia.
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http://yuletidetreasure.org/archive/fandom_robert_a_heinlein__the_moon_is_a_harsh_mistress.html