One possible plot could be that Bella's bakery becomes a target in the mafia world Edward is part of. Maybe Edward has to protect Bella from rival mafia groups who want to use her bakery for illegal activities like money laundering.
Another interesting plot could be that Bella's baking skills are so amazing that they attract the attention of Edward's mafia family. They see an opportunity to use her bakery as a front for their legitimate business operations, which brings Bella into the world of the mafia in a unique way. She then has to navigate this new world while also dealing with her feelings for Edward.
One possible interesting plot could be Bella getting caught in the middle of a power struggle within Edward's mafia family. Maybe she becomes a target, and Edward has to go to great lengths to protect her.
The main characters are clearly Edward and Bella. Edward is part of the mafia, which gives him a dangerous and mysterious edge. Bella, on the other hand, is a baker. Their different worlds collide in this fanfiction.
Perhaps a plotline where Edward is trying to keep Bella safe from the darker aspects of the mafia life, like dealing with traitors within their own group. This could create a lot of tension and romantic moments as he shields her.
One interesting plot could be their exploration of a new, mysterious island during their honeymoon. They might discover hidden caves with ancient secrets.
One interesting plot could be where Edward and Bella face a new supernatural threat together that tests their relationship in ways not shown in the original story. For example, a new type of vampire with unique powers arrives in Forks.
Another plot might involve an external threat to the royal family that Edward and Bella have to face together. Maybe a neighboring kingdom is planning an attack or there is a magical threat that only their combined powers (if they have any in the fanfiction) can overcome. This would test their relationship as they fight for the safety of their kingdom and each other.
Another plot could be that there's some sort of mystery or danger at the prom. Maybe a rival vampire group shows up, and Edward has to protect Bella while still trying to make their prom night special. They might have to dance and be romantic in between fending off attacks.
One interesting plot could be the child having special powers inherited from both Edward and Bella. For example, the child might have the ability to read minds like Edward and also possess Bella's strong will. Another plot could be the child's struggle to fit in with both the vampire and human worlds. Maybe they face challenges at school because they are different from the other kids.
One interesting plot could be where Edward and Bella face a new kind of vampire threat together. They have to use their unique bond as mates to overcome it. For example, a group of vampires with special powers that can disrupt their mental connection.
One possible plot could be that Edward returns to Bella after a long self - discovery journey. He realizes that his love for her is unwavering. Another might be that he comes back to protect Bella from a new and dangerous threat in Forks.