They were on opposite sides, during the Apocalypse. Crowley was essential in the stopping of it, and now rules Hell. He sees Lucifer as a threat, and Lucifer likely sees him a traitor.
[Which technically he is, but who from their world isn't anyway.]
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timeasmymeasure
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Date: 2012-11-16 06:29 pm (UTC)[Which technically he is, but who from their world isn't anyway.]