Hi there, if you're still looking for fills for this and don't mind a WIP, Not Exactly Ovid (http://archiveofourown.org/works/516521/chapters/911662) seems to be shaping up to the kind of thing you want. It's only seven chaps (38k words) so far, but it's really good and updates fairly fast. Summary: Castiel makes a sacrifice for Dean to save Sam from the Cage, but is unable to save Adam. As the Winchesters try to free their younger brother, they have to deal with a community of hunters that holds them responsible for the near-Apocalypse. Attempting to stay off the radar, they turn to a Phrygian goddess who ends up complicating an already complex situation.
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Summary: Castiel makes a sacrifice for Dean to save Sam from the Cage, but is unable to save Adam. As the Winchesters try to free their younger brother, they have to deal with a community of hunters that holds them responsible for the near-Apocalypse. Attempting to stay off the radar, they turn to a Phrygian goddess who ends up complicating an already complex situation.