I think fanfic is natural, it's just a further expression of the same drive that has kids running around acting out their version of a show or movie they've just seen. It's one of the things people do, and I think that anyone who dismisses it out of hand has lost touch with what it means to be a child.
That doesn't mean I think it's childish, but that its roots are so fundamental to the human condition that they first express in childhood.
I will admit that I can't speak to m/m slash as I've never really seen the point of it. I'm sure some is very good, but it's one of those things that just doesn't resonate with me. It could double or disappear tomorrow and I wouldn't notice either way.
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