I don´t know if your examples are really called fan fiction. I don´t know well-defined the term is really, but it is usually used for stuff written by non-professionals.
Well, that's a point. But your previous post said "
All 'fan fiction' really indicates is that it is fiction based on pre-existing fictional characters" [emphasis mine].
So by your own previous definition, my examples totally qualify. But sure, if you want to change that definition and add other characteristics that the term
also really indicates, then they may not be.
But who really cares about setting some sort of specific rigid boundaries around what is or isn't fan fic? We all kind of get it. The point is, some characters are so compelling that some people who like to write, professionally or otherwise, are moved to keep their stories going, imagining the characters in other scenarios.
In the United States, the characters of Sherlock Holmes books, the Wizard of Oz and Star Trek (whose characters, of course, were the original subjects of slash fiction, at least according to legend) have attained in the public mind almost the status of fairy tale characters like Snow White or Red Riding Hood.