tough question. Mercy for the Machine has a lot of things i've been umm'ing and aah'ing over for a while, so I'm super pleased it came out well. Obedience and Obesity is super fun, even if I feel it's stiff in places. Of course, How Do You Stop? has tons of great, hedonistic character writing; no surprise it's my most popular fic. Senpai's Special Lesson is a classic with KILLER dialogue, too.