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The comedic potential of Aziraphale loving Christmas in theory but hating it in reality, which gives him catholic guilt/bad angel feelings, so he triples down on Christmas spirit to compensate. He's decking the halls like no tomorrow, he's partidging that pear tree, ohhh he's jingling those bells alright and cooing over the love in the air and isn't it wonderful Crowley, the spirit of christmas my dear, i may have done a little miracle and made it snow in Tadfield, Crowley. Meanwhile he's holed himself up in the bookshop like its under seige from guerilla christmas shoppers, he can't seem to get a single cup of cocoa that doesn't have peppermint in it, 4 children this week have poked him in the belly and asked him if he's santa clause, and to top it all off Mr. Brown has asked him to play the role of Gabriel in the Whickber street Nativity Play.
Crowley's in the corner watching the angel's eye get progressively twitchier and using up his entire demonic miracle quota to make sure Aziraphale's cup never empties of blindingly acoholic eggnog.