Another theme could be alternate universes. Maybe in a different world, they have different roles in the band or their relationship has a different dynamic. Some fanfictions might explore what would happen if they met under different circumstances, like if they were in a different genre of music.
You can try fanfiction websites like Archive of Our Own (AO3). There are often a lot of fan - created stories about various topics and pairings, including ones related to Gene Simmons and Paul Stanley. Just use the search function on the site to look for relevant stories.
One common theme is their friendship and the early days of KISS. Writers often explore how they met, their initial creative collaborations, and the challenges they faced together in building the band.
Fanfiction.net could also be a place to look. However, the quality can vary greatly. Some stories might be really well-written, while others not so much. But it's still worth checking out for Gene Simmons and Paul Stanley fanfics.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfictions, and you can easily search for Stanley x Narrator ones. There are different tags you can use to narrow down your search.
A popular Stanley x Narrator fanfiction is 'The Understanding'. In this one, the writer focuses on the emotional connection between the two. It's beautifully written, with detailed descriptions of their interactions and how they come to understand each other on a deeper level.
One common theme is the clash of different worlds. Simmons comes from his own world, and when combined with the Twilight world, there's a lot of culture shock and differences to overcome. Another theme is friendship or even romance that can develop between Simmons and the Twilight characters. They have to learn to understand each other.
A common theme is their scientific adventures together. Since they are both scientists, many fanfics focus on them solving complex problems in the lab or in the field.
One common theme is the development of their relationship. It could start as a reluctant friendship and gradually turn into a romantic one. Another theme is the challenges they face together, either from external forces like enemy attacks or internal team dynamics that put a strain on their relationship.
Another theme is their creative process. Fanfics often show how Ace's unique playing style and Paul's showmanship combined to create their signature sound. It might depict them in the studio, bouncing ideas off each other and coming up with hit songs.