I don't know how to explain this really well, but I was wondering if there were any fics focused on Castiel mating with an angel (preferably one that we know), when he was heaven, way back when things were uncomplicated, but then being heartbroken when that angel leaves for whatever reason (like mating with Lucifer before he was cast out, or mating with Gabriel or Balthazar before they left heaven). Anything really. I know there really isn't much fics like this (because trust me, I've searched), so I'll take anything...even if it only hints at this. I'm not too fussed about the pairings either (polyamory fics welcome) so anything goes :)