I've been writing since 2000 and from what I've posted online I've received both positive and negative feedback. But one thing though, on fan-fiction.net I've gotten requests from two users including writing a story about a pairing I have no interest in whatsoever. Two things I've tried to make clear with people who read my work is this, one I DON'T take requests and two, I don't want anyone writing fan fiction based on my stories or using my characters. Someone used one of my characters in a fan fiction story without asking me and I wasn't happy about it. I've posted on my main website regarding fan fiction involving my characters. One person said it seemed kind of harsh, I'll say this I don't want to see my characters doing anything that's off color like for example one of my dog characters falling in love with one of my cat characters. Plus, I know some authors have requested on sites like fan-fiction.net that people don't write stories based on ones they've written and/or using their characters.
Any suggestions for how I can get my point across about not taking requests or people writing fan fiction based on my stories?