I know this is not the fic you're looking for (I read that one and I'm going to keep looking to see if I can find it again...), but this fic is also an outsider-POV fic with sort of implied wincest (if you squint maybe) and it's told from the POV of a teenage girl who Sam and Dean save who then travels with them... and it's SO GOOD!!
I Have a Rendezvous With Death (http://archiveofourown.org/works/193826?view_adult=true) by leonidaslion on AO3.
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Date: 2012-01-22 02:17 am (UTC)I Have a Rendezvous With Death (http://archiveofourown.org/works/193826?view_adult=true) by leonidaslion on AO3.