At first, it might be a bit rocky. Since the marriage is by treaty, they may be a bit wary of each other. But as they start spending time together, they could begin to discover common interests. For instance, they might both be interested in a particular type of literature or music, which helps to break the ice.
One interesting plot twist could be that the treaty has a hidden clause which changes the nature of their marriage completely. For example, it might initially seem like a simple political union, but the hidden clause reveals that they have to perform certain magical or supernatural tasks together to truly solidify the marriage.
Carlisle is another character that many might like. As Edward's father figure, he can offer wisdom and guidance to the newlywed couple. His calm and ethical nature can play an important role in helping Edward and Bella navigate any difficulties that come up in their married life, such as dealing with vampire politics or ethical dilemmas.
Often, other members of the Cullen family are also important characters in these fanfictions. For example, Alice, who can see the future, might play a role in helping Edward and Bella deal with challenges in their marriage. Her visions could give them warnings or insights into what's coming.
They need to communicate openly. Edward should share his fears about Bella's safety without being overbearing, and Bella should express her feelings of being restricted. By having honest conversations, they can start to understand each other better.
One common problem could be Bella's adjustment to the vampire lifestyle. She might struggle with the restrictions and the new moral dilemmas it brings, which could put a strain on their marriage.
Edward, who is often depicted as brooding and mysterious in the original stories, will have his character further explored in this fanfiction. He has to deal with the idea of being forced into a marriage, which might conflict with his own sense of self and his relationship with Bella. Bella, on the other hand, is a strong - willed girl. She might initially fight against the forced marriage but then find a way to make the best of it.
In some fanfictions, their marriage might lead to the discovery of new powers. For example, Bella's unique human - turned - vampire nature combined with Edward's abilities could result in a special power that helps them protect their family. It could be something like a telepathic bond that is even more powerful than Edward's existing one.
In some Edward and Bella marriage fanfiction, there could be a plotline where they face threats from other vampire clans who are not happy about their union. This would lead to a lot of action and drama, with Edward and Bella having to fight to protect their marriage and their family. They might have to rely on their friends and allies within the vampire and human worlds to overcome these challenges.
One possible plotline could be Bella initially resenting the forced marriage but gradually discovers Edward's hidden kindness and they start to fall in love for real. For example, Edward might go out of his way to protect Bella from the threats in their supernatural world, which makes Bella see him in a new light.