I suppose that this would be a good thread to post this in. Changes is an interactive story that I've been following for several years now. It currently has over 7,000 chapters. Some chapters are really good, some chapters aren't that great. Some paths have over one-hundred chapters, some only have about twenty. I think that anyone can freely add to it, but if it's a recent chapter (which can be checked on the "Recent Additions" page), you might want to e-mail the author and ask him whether or not he's alright with you adding on to the story he may currently still be working on. It's a sissy ABDL story about a boy named Daniel that has to make a decision about school. He can either: stay at home and be homeschooled, go to a boarding school, or move in with his mother's friend and her two daughters and go to school in that town (the path with the most chapters). The other characters are also diapered at some points, both with and without Daniel at times.
https://www.writing.com/main/interact/item_id/1690111-Changes