This has come up a couple times now, so I'd like to give my take on this sort of stuff. If you ever want to draw fanart or write a story featuring my characters, I am fine with it as long as you ask permission and have me okay your ideas. Especially in the case of a story, I'd like to see a rough draft to make sure my characters are being portrayed accurately. I usually try to go in depth on my characters (with their personalities and what they're into) in their bios, so I'd advise giving those a read. I will definitely not okay any idea that involves sex, genitalia, or anything super mature like that. If you have any questions let me know.