I suspect that I’m about to step into something I would be wisest to keep well away from. But what the hell, it’s that time between Christmas and New Year’s. And nobody’s yelled at me over the internet since I said that the TV Aziraphale doesn’t use a cell phone. *
Canonically, which is to say using the text in the book, you don’t get any description of Crowley’s sex life. The only thing the book says is “angels are sexless unless they specifically make an effort”. You can infer, and (more to the point) you can imagine, and lots of people have chosen, not unreasonably, to ship him with Aziraphale, but you are still Making Stuff Up. It could be Making Stuff Up that happens between paragraphs, or Making Stuff Up that isn’t mentioned at all, but it’s still Making Stuff Up.** (And using the kind of eagle-eyed textual analysis that Bible scholars used to decide exactly what a piece of four thousand year old verse definitely meant also counts here as Making Stuff Up.)
Which is the fun of fanfiction, and part of the tradition of fanfiction. As is, I’m afraid, grumbling at people who do not see that your ship is the only true ship, and choose to ship anyone else with anyone else.
If anyone decides that The Relationships in Their Fanfiction Are the Only True Fanfiction, it seems to me they are missing the point. The point is Fanfiction exists so that you can imagine, enjoy and fill in the gaps. The point is that you can change things and have fun with them. And the stories are absolutely true… for you.
The TV series gets deeper into Crowley and Aziraphale’s relationship. It’ll be canonical for the TV series, and not canonical for the book.***
If I were to Pronounce on things that are not explicitly stated in the book, I still wouldn’t be telling you if Crowley was Canonically Gay. I would be telling you what I think, because it’s not canon unless it’s in the book. It won’t be TV canon unless it’s on the screen.
So, do not worry what other people think, and do not worry about what they say. These are not things on which people can be right or wrong, or on which anything can be “settled”.
Make fun fanfiction. Enjoy yourself. Make things up. Share them. That’s the point.
*People would only bother him on it. And if anyone gave him one as a present, it would be still be in its box, on the same shelf as the still-unboxed Kindle.
**Which was what Terry and I did when we wrote the book. And what I had to do for the TV scripts when I needed to take the story into places the book hadn’t covered.
***They don’t contradict each other, but there is territory covered by the TV series that isn’t covered by the book, particularly about Crowley and Aziraphale in bygone years. Also the Present Day in the book is probably the early 1990s, and the Present Day in the TV series is 2019ish, although 11 years ago in the book wasn’t particularly 1978, and 11 years ago on TV is post-ubiquitous cellphones but pre-smartphones.
Then again, Good Omens is just Black Books fanfiction and there’s no denying it.
Not just fanfiction, but the special magic kind of fanfiction you can only make happen when you write it over a decade before the thing that it’s fanfiction of exists. That’s what makes it so special.