Silencing sigils with Dean/Cas

[hamrensel.livejournal.com]

I can't remember the name of a fic that take place in the bunker.  Dean and Cas put some kind of silencing sigil on the walls of Dean's bedroom in the bunker.  Some how they get damaged I think Sam accidentally does something.  Dean and Cas find Sam asleep in one of the basement rooms over a group of books.  He has been hearing them when they have sex and doesn't want to tell them that he damaged the sigils.  He has been researching how to fix them. 

Comments

[anactoria.livejournal.com]

I could be wrong, but I think that's A Room of One's Own (http://archiveofourown.org/works/1417834/chapters/2978790) by NorthernSparrow.