A/b/o slave fic

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I'm looking for a deleted fic that was oposted on AO3. It had Sam, Dean, Cas and Gabriel in it. The pairings were either Dean/Cas and Sam/Gabriel or Dean/Gabriel and Sam/Cas, so since I'm not sure, I didn't put any pairings in the tags. In the fic, Sam and Dean were alphas and Cas and Gabriel were omegas. In the AU, omegas were basically treated like slaves and Cas and Gabriel get bought by Sam and Dean, but Sam and Dean are nice to them and all. In the beginning though, Cas and Gabe are scared of and mistrust the Winchesters, but they eventually warm up to them. Thanks a bunch.