For 1 I think you're talking about cloudyjenn's story Not usually a Good thing (http://cloudy-fic.livejournal.com/39387.html) and for 3, try Catching a Clue, or Five Times Dean and Cas Are Mistaken For a Couple (http://community.livejournal.com/deancas_xmas/38365.html#cutid1)
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