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Angels did not share Heaven with humanity, not precisely. They occupy the same space while having vastly different experiences. If Castiel were to compare Heaven to that brothel (and he often thinks of the brothel when he thinks of Dean), an Angel of his rank was allowed to occupy certain common areas — but only a select view were even allowed into the private rooms.
For the first time, as he looks up at the stars twinkling and wonders how far he is from Dean’s Heaven, Castiel wishes he were more of an angel and less in love with a man.