I gave fic!
I can now reveal that I wrote Below the Belt at hp_beholder for trickofthedark/Didodikali (who, incidentally, wrote a delightful Slughorn/Hooch fic for the same exchange). Not only did I get Dudley-fic, but I gave it, too. It's Dudley/Millicent, and I'm rather fond of it. (Er, it is R-rated, so it's probably NWS.)