Here is a link to a very good fan fiction writer. I have enjoyed her stories a lot. Most recent story is Carry You Home
Two part tag to 10.14, The Executioner's Song.
Sam knows Dean is in trouble, whether his brother will admit it or not. How far is Sam willing to go in order to save his brother? The river ends at the source...but what is the source? Sam's about to find out..
I loved it.
Micaiah's fan fiction
I love Supernatural with all my heart. I've never been as invested in a show as much as I am this one and I've never loved two characters anymore than I love Sam and Dean. I consider myself a Dean girl because I identify with him more but I love Sammy too. There is no Sam without Dean and vice versa. I'm not into Wincest and I don't write it. I'm more into the brotherly relationship and how they are willing to go to the ends of the earth for each other. As Demian said in The Real Ghostbusters: "To have a brother who would die for you. Well, who wouldn't want that?" I think at their core, everyone wants a relationship like Sam and Dean...to have that one person who puts you above everything and everyone else. Is it healthy? Maybe, maybe not...but we're still fascinated by it.
Go check it out.