I have been using fan fiction, fanfiction and fan-fiction (somewhat) interchangeably since the early seventies. I prefer different forms for different usages, though I have no linguistic reasoning to back up any of my choices. It's just the way I have always done it.
I am a fan-fiction fan. Fans of fan-fiction are very perceptive people. I like the hyphenated form when the word fan is a used in the same sentence.
I use fanfiction when I'm talking about the fiction works of fandom as a whole, and fan fiction when I'm talking about what I write. I'd never thought about this until I read your post. Shows how clueless I've been about my own fannish vocabulary.
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I am a fan-fiction fan.
Fans of fan-fiction are very perceptive people.
I like the hyphenated form when the word fan is a used in the same sentence.
I use fanfiction when I'm talking about the fiction works of fandom as a whole, and fan fiction when I'm talking about what I write. I'd never thought about this until I read your post. Shows how clueless I've been about my own fannish vocabulary.