If you like reading erotica, and you're into BDSM I've got a site perfect for you! BDSM Library is full of submitted stories filled with all sorts of kink and punishment.
When you load the site, you'll see in the middle of the screen there are a number of latest submitted stories available. You can click on any of these and open either the whole story in one go or view it in parts. There doesn't appear to be any categories here, however you can view stories by top rated, popular and longest.
There isn't really much else to do here apart from read BDSM style stories, but if this is what you are into, this is probably the best place to find them!