I just submitted the next chapter of Little Sister's Amazing Underboob, and sometime today or tomorrow it will pass Predatory Mothers in terms of total downloads. Which is really kind of amazing since that story was posted back in 2009 and the current story started a few months ago.
Boobiliscious is the next closest story to those two at just under 30,000 downloads. Long stories tend to have more downloads since there are more chapters and more instances of them getting the attention of a recent update.
I'd already consider Little Sister's Amazing Underboob to be my most popular story on this site, but once it has the most downloads, it will have all the top stats for my stories. Thanks to everyone who has read and enjoyed these stories.