It's hard to say if they are extremely popular in a general sense. While there is a large and diverse fan community for Good Omens, not everyone is interested in this particular type of fanfic. Some fans might be more into the romantic or adventure - based fanfics about aziraphale and crowley.
Fanfic websites like Archive of Our Own (AO3) are good places to start. There are a large number of fan - created works there, and you might be able to find aziraphale x crowley fanfics, but it's important to note that spanking - related content may not be suitable for all audiences and might not be in line with the website's rules if it's too extreme.
There's also 'Crowley's Perspective'. It offers a unique take on their relationship by focusing mainly on Crowley's point of view. You get to see his internal thoughts and feelings about Aziraphale, which adds a whole new layer of depth to their relationship.
In fanfics, the 'weight' could refer to the significance or importance of Aziraphale and Crowley. It might be about how much they matter to the overall plot or to each other. For example, a fanfic could focus on how their relationship is the 'weight' that holds the story together during a time of great upheaval in the Good Omens universe.
I'm not sure if there is a specific aziraphale x crowley omorashi fanfic available. You could try searching on popular fanfic websites like Archive of Our Own. They have a vast collection of Good Omens fanfics, but it might be a bit niche so it may or may not be there.
I would recommend 'Aziraphale and Crowley's Adventures in London'. This fanfic is full of fun scenarios where the two characters explore different parts of London. It shows their friendship in a very light - hearted way. The descriptions of the city are also quite vivid, which adds to the overall charm of the story. It's a great starting point as it doesn't have a very complex plot and you can easily get a feel for how the two characters interact.
I really like 'Crowley and Aziraphale's Celestial Adventures'. It has a lot of humor in it. For example, there are some really funny misunderstandings between Crowley and Aziraphale that add a light - hearted touch to the story. It also delves into their backstories in a creative manner, which helps to flesh out their characters even more.
In aziraphale and crowley omegaverse fanfic, the characters may exhibit different behaviors compared to the canonical version. For example, if Crowley is an alpha, he might show more dominant traits while protecting aziraphale. And aziraphale as an omega could have a more nurturing side. It's all about how the omegaverse tropes are applied to their personalities.
It can be considered popular. There are a large number of fans who are interested in this pairing. The ambiguity in their relationship in the source material gives fans the incentive to write fanfics exploring their possible romantic relationship. These fanfics can be found on various fanfic platforms with a significant number of reads and positive feedback in many cases.
Sure. There are fanfic communities that have rules against inappropriate content. So, you can search on those platforms and specifically look for stories that are tagged as 'platonic' or 'general audience' to find fanfics about Aziraphale and Crowley without any adult themes.