Actually I know some. Though I believe there is more than I'm listing, however because I can't find the title for all the ones I have, I'll just list the ones I know.Kirakira hikaru - this story is probably one of the sweetest about how Sora and Riku are kids and they are looking to find some starbits (which are a type of sweet) and reminisce of their adventure to find some.Innocence - Riku and Sora come across a chocobo but Riku's jealousy gets the better of both of them (kids)Neverland - Riku is almost twelve and Sora learns that he can't always rely on Riku, causing them to draw apart when they are older.I have read some other ones but they contain 18 rated stuff and if I'm honest I was avoiding that so I only read some. There are also some other doujinshi's I've come across but it's all Japanese unless someone can translate it.