Wherein Crowley Meets - Well, Crowley

The title pretty much explains this one. As Anthony Crowley and Aziraphale chill in their usual meeting place, a strange call takes the demon away. Chaos ensues as he ends up not exactly where he should be. Supernatural Crowley is future Good Omens Crowley, if that makes sense at all. (Disclaimer: I do not own Supernatural, or the authors of Good Omens, or any of the characters.)