The very first fic that jumped to mind for me was Hard to Be Soft. The comments are turned off now, but I'm pretty sure they weren't the first, you know, fifty MILLION times I read it, so I have no excuse other than "It was already a couple years old the first time I read it! The author has undoubtedly moved on and would think I was weird!" which is ridiculous but well. Welcome to the inside of my head. ;)

Otherwise, hmmmm. The problem is I have a TERRIBLE fic memory (anytime I want to find something, I have to be all "hey mistresscurvy or amazonziti or isweedan, what's that fic with that thing? You know?"). But I'm having this sudden thought that I'm not sure I ever got up the gumption to comment on Amateur Cartography or Need You Wild or Tell Me To Stop, at least not until relatively recently. ... now I need to go see if I have or not.