for this pairing the only fav author that has not been mentioned here yet is otp_destiel........ in this case i would recommend Interacting with Humans 101 (http://otp-destiel.livejournal.com/6592.html) - w/ sam - Out of the blue, Dean starts getting visits from random angels asking him inane questions. On a Wing and a Prayer (http://otp-destiel.livejournal.com/38960.html) - w sam - When Gabriel shows up to join Team Free Will and offers them a potential solution to the Apocalypse, none of them could have imagined what was going to happen or how it would changes things forever. Home (http://otp-destiel.livejournal.com/19073.html) - w sam - Human and angelic customs collide leading to a misunderstanding that has Dean thinking the worst. short but dom!cas: Taken (http://otp-destiel.livejournal.com/21714.html) - w/o sam - "You are the submissive here, Dean; the human. You will yield to me, not the other way around."
this author also has probably the longest running dean/cas fic and one of the longest (also au!) but it was started at the beginning of season 6 and sam is portrayed as he was at that point so it may not be to your liking. we have not yet learned if the way he acts is due to something like it was in season 6 or not. also cas in naive at the start but that soon changes!!!!
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in this case i would recommend
Interacting with Humans 101 (http://otp-destiel.livejournal.com/6592.html) - w/ sam - Out of the blue, Dean starts getting visits from random angels asking him inane questions.
On a Wing and a Prayer (http://otp-destiel.livejournal.com/38960.html) - w sam - When Gabriel shows up to join Team Free Will and offers them a potential solution to the Apocalypse, none of them could have imagined what was going to happen or how it would changes things forever.
Home (http://otp-destiel.livejournal.com/19073.html) - w sam - Human and angelic customs collide leading to a misunderstanding that has Dean thinking the worst.
short but dom!cas: Taken (http://otp-destiel.livejournal.com/21714.html) - w/o sam - "You are the submissive here, Dean; the human. You will yield to me, not the other way around."
this author also has probably the longest running dean/cas fic and one of the longest (also au!) but it was started at the beginning of season 6 and sam is portrayed as he was at that point so it may not be to your liking. we have not yet learned if the way he acts is due to something like it was in season 6 or not. also cas in naive at the start but that soon changes!!!!