Yes a few... Right now I have one I'm working on with three sequels already and I'm writing two more sequels to it. And I've written one story in Star Wars fandom that has three sequels I think. Why, because the commenters liked it so much that they wanted a sequel, so I wrote it! I love sequels, but I don't like when you can't go from one to five without having read the ones in between... all mine have been stand alone sequels; you can read them in any order and still understand what's going on, or you can read them completely separate from any of the other stories.