Taken from lost_spook:
Pick any story I've written, or, in the case of my longer, chaptered works, any chapter from any story I've written, and comment to this post with that selection. I will then give you the equivalent of a DVD commentary on that snippet: what I was thinking when I wrote it, why I wrote it in the first place, what's going on in the character's heads, why I chose certain words, what this moment means in the context of the rest of the fic, lots of awful puns, and anything else that you’d expect to find on a DVD commentary track.
And if I’ve already written up a notes post as I’ve done for several Yuletide stories, then I’ll just expand upon something—whatever someone may wish to know about that particular section, if there’s a particular area they’re curious about. Fanfic may be found over on Ao3, and here.