We can’t stress enough the trust, familiarity and closeness that this simple moment evokes. Neither of them shows the slightest quiver or sign of discomfort at this proximity and invasion of personal space (if there is such a thing as personal space between them)
I don't read Good Omens fanfiction, so if there is I will never know.
This is how to engage with fandom: answer questions, be generally around and supportive and fun, and otherwise leave us to our own devices. Neil is the KING of how to interact with fandom!!