Some fanfictions might focus on alternative universes. In these stories, Edward and Bella could be in a completely different setting, such as a modern - day city without the presence of vampires and werewolves. But their love still manages to develop in unique ways, which is really interesting for fans who want to see a different take on their relationship.
One common theme is the family dynamic. Carlisle being the patriarch, his influence on Edward and Bella's relationship within the family framework is often explored. For example, in many fanfictions, he helps them navigate the difficulties of being part of a vampire family.
Another option could be Wattpad. It also hosts a wide variety of fan - created stories. However, the quality and content can vary greatly. So, you may need to spend some time browsing through the search results to find the exact 'Edward shares Bella' fanfiction you're looking for.
A common theme is the 'what - ifs'. What if Bella had chosen Jacob instead? Fanfictions often explore this alternative storyline and how it would affect the vampire - human relations in Forks. It can be really interesting to see how the characters develop in this different scenario.
Another theme is Renesmee's growth and development. Fanfictions often explore how she learns about her powers and her place in the vampire - human - hybrid world. It can be really interesting to see how she matures and how her relationships with her parents and other characters change as she grows. Some fanfictions also focus on her friendships and how she navigates the social aspects of her world.
Some fanfictions might focus on the 'what ifs' in their relationship. What if Edward didn't come back in New Moon? How would Bella's life change? This kind of theme adds a lot of drama and speculation. There are also themes related to the power dynamics between them. Edward has superhuman strength and abilities, while Bella is a human (at least initially). How does this affect their relationship? Is it a source of conflict or a way for them to protect each other?
One popular theme is the exploration of their relationship in different time periods or alternate universes. For example, some fanfictions might imagine them in a modern world with different social norms.
Some of the themes include the transformation of their characters. In a mob fanfiction, Bella might become a stronger, more assertive character having to deal with the mob environment. Edward, on the other hand, may struggle with his dual identity - his love for Bella and his loyalty to the mob. There's also the theme of family, but in a very different sense. Instead of the normal family unit, it's the mob family which has its own set of rules and hierarchies that they have to navigate around while maintaining their relationship.
The most popular themes usually revolve around their unique love story. For instance, the idea of Edward and Bella having a more adventurous relationship, traveling to different places in the world while dealing with their vampire - human relationship. Another is the theme of family. How they create a family together, including Bella's transformation into a vampire and how they raise their child in the fanfiction world. There's also the theme of sacrifice, where either Edward or Bella has to sacrifice something for the sake of their relationship.
One popular theme is the challenges they face as new parents. For example, dealing with the baby's special abilities that might be inherited from their vampire - human union. Another theme could be the reactions of their families to the new baby. The Cullens might be excited but also worried about protecting the baby from the outside world.
One of the most popular themes is the exploration of their eternal love. Since they are in a vampire - human relationship, many fanfictions focus on how their love can last forever despite the differences. Another theme is Bella's transformation. Writers often explore what it would be like for Bella to become a vampire and how that would change her relationship with Edward.