I just finished listening to a podfic of rainylemons' "Will You Serve?" verse, which has several related fics that should get your #3 happiness going, and may even include some of your other elements. Later stories have Castiel/Sam, nothing super explicit.

As podfic: http://ratherastory.livejournal.com/127401.html

The text of each story is linked there too, so I'll just let you find it in text from there, if that's your preferred way of taking it in.

Enjoy!