Not a site completely dedicated to feet. It is a story posted by a member. The story is added in "chapters" by other members. This basically creates a interactive book. The chapters are created with a choice at the end. From there, another person (or even you) can add on to the end to create a story with multiple endings based off of choices you make.
I'm sure this has some great stories on it but I found the site via this foot fetish option. This was is strictly anime feet but there are others on there that you can find through the search bar.
I was hoping posting this more to the public would get the stories more attention since many of them are very incomplete. I'm sure someone else here will enjoy it and hopefully it will get more attention to it's incomplete articles.