Hey aff forums users!
I haven't found much Slenderman-mythos-related or Marble Hornets-related adult fanfiction or fanart online. Just one or two items. It's sad... you'd think there'd be quite a bit more out there! It's a really neat topic.
Personally, I like Marble Hornets and Slenderman so much, I've written two fanfics centered around the mythos... One called "My Encounter with the Slender Man", which is a scary fic with an explicit, sexy ending, written in such a way so that the narrator could be either male or female. Depends on your imagination. I've also written a fic called "My Encounter with Totheark", which plays off the canon of Marble Hornets, so is narrated by Jay.
Tryin' to do my part to give the Slenderman mythos a solid "rule 34" base on the internet. If you were looking for that, I hope you enjoy my fics.
Let me know if you find any other adult-oriented materials online for this fandom!
All the best,
R.o.T.
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My Encounter with th Slender Man
My Encounter with Totheark