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Recursive fanfiction, or fanfiction of other people's fanfiction, can be controversial. Some people don't believe that you should write it without permission, and some people think you shouldn't write it at all. I think that this is bullshit. I will usually ask permission before I write recursive fanfiction, but I view this as an issue of politeness rather than morality, and I rarely ask permission to use an element of someone's story in my own (e.g. characters, worldbuilding). What I do think is genuinely important is giving credit.