From Fanlore, the fan run, non-profit wiki about media fandom: 

“Sam/Dean Slash Archive is a slash Supernatural fan fiction archive that focuses on Wincest or the Sam/Dean pairing. It has been online since January 14, 2006. As of March 2012 it has over 300 stories archived, 581 authors and over 4000 members who had written almost a total of 30,000 reviews. Stories must “be Sam/Dean slash. Gen/Pre-Slash story is welcome too as long as the main focus of your story is the relationship between Sam and Dean Winchester." 

The archive will accept underage stories with appropriate warnings but ask that if Sam or Dean ”have been sexually abused by adults when they are under the age of 16, please do not be too graphic.“The only other exclusion is: "No bestiality and no snuff. Any story where Sam or Dean is killed as a part of the sex act will not be archived.”

The archive also offers multiple ‘skins’ to visitors allowing them to customize their viewing experience.”

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