Crowley finds his secret conviction that the world was designed for his personal entertainment severely tested by the bloody boring fourteenth century. But what is he a demon for, if not to spice things up a bit? It's irrelevant that a certain angel is taking his orders seriously for once and embarking on a life of self-denial and doing good. That isn't the reason Crowley is bored, at all. And he certainly isn't acting up to get Aziraphale's attention because he's desperately in love or anything.
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