Nice! I'm a huge fan of the Arthurian legends and of the idea of Aziraphale and Crowley meddling in them (sadly, my own attempt at writing something with a similar premise failed). I like that Aziraphale dislikes Merlin, who is rather a foul meddlesome old coot in some versions (and was plain awful in Mark Twain's version), and mmm, including Lucifer really raises the stakes (and are those references to Dante's Inferno I spy?). Poor Crowley and Aziraphale, but I loved what they did when assuming it might be the last time they saw each other. ♥

Also, EEE MORPHEUS. And oh, poor Guinevere. I love how you portrayed the conflict with Arthur too, how you've shown him as a courageous righteous man but he has sinned and he can also be too righteous.

And it's hilarious that Aziraphale automatically assumed Crowley kidnapped someone, has this happened before? XD And Nimue! :D And awww, the ending. ♥

Lovely work!