Well, in aziraphale x crowley overstim fanfics, a frequent theme is the clash of their two worlds. Their angelic and demonic backgrounds create a lot of tension and potential for overstimulation. It could also be about the new sensations and emotions they encounter when they step out of their normal comfort zones. For example, when they interact with human concepts in a more intense way than usual. This can lead to a series of events that test and expand their relationship.
One popular theme is their friendship. How they support each other despite being on different sides originally. Another is their shared experiences, like the times they've saved the world together.
I'm not sure specifically about 'overstim' fanfics for aziraphale and crowley. But you can try searching on popular fanfic platforms like Archive of Our Own. There are likely many well - written fics about them with different themes and styles.
One common theme could be the exploration of Crowley's complex personality. Another might be his relationships with other characters.
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.
Well, a lot of Crowley x Aziraphale fanfics focus on their unique dynamic. Some fanfics might show them going on adventures together that are not part of the original story. These adventures can range from solving supernatural mysteries to just exploring the human world in a more in - depth way. And then there are those that focus on the emotional development of their relationship, like how they come to truly understand each other on a deeper level.
One common theme is the exploration of their relationship outside of the constraints of Heaven and Hell. Since they are an angel and a demon, their relationship is unique and fanfictions often play with how they can be together despite their opposing natures.
One common theme could be the idea of indulgence. Since belly stuffing implies over - eating or excessive consumption, it might explore how Crowley and Aziraphale experience indulgence in a new way, perhaps as a form of relaxation or a break from their usual celestial/demonic duties.
One common plot is that Aziraphale has to take care of Crowley after he gets injured in a battle against some other supernatural forces. This often involves a lot of tender moments as Aziraphale tries to heal Crowley using his angelic powers or with the help of some magical items.
One common theme is the exploration of a different kind of relationship dynamic. Since in omegaverse there are alpha - omega and sometimes beta roles, it changes how aziraphale and crowley interact. Another theme could be the struggle against the norms of the omegaverse society if they don't fit into the traditional alpha - omega relationship mold.
Common themes include love against all odds. Given their different backgrounds and allegiances, their love story in fanfic is often about overcoming obstacles. Also, self - discovery is a theme. As they explore their relationship, they also discover new things about themselves. And there is often a theme of secrecy, as they have to keep their relationship hidden from others in the fanfic narratives.