It isn't fanfiction, but Andy Weir apparently wrote a short addition to The Martian early last year to celebrate the story's tenth anniversary.
https://t.co/jj86gMfxly
https://t.co/jj86gMfxly
“I really hope I’m behind this convoluted mess; at least that way I’ll be able to get revenge by doing this to myself. I won’t even have to feel bad because it’ll be all my fault.” - Harry Potter, The Master of Death by Ryuugi.