In some fanfictions, Bella and Rosalie might be pregnant at the same time in a post - Twilight world where the vampires and werewolves have made peace. Their pregnancies could symbolize a new beginning for their families and the entire community. They might face some difficulties due to the different natures of their partners (vampire or human), but they overcome them with the support of their friends and family.
One popular Bella and Rosalie pregnant fanfiction might be where they support each other through their pregnancies in a world that's different from the original Twilight setting. For example, they could be in a modern AU (alternate universe) where they are just normal women dealing with the joys and challenges of pregnancy together.
There could be a fanfiction where Bella and Rosalie's pregnancies are part of a magical or supernatural event that's not related to the vampires in Twilight. Maybe they are part of a new species that has unique ways of handling pregnancy, and the story focuses on their discovery of these new aspects of themselves and their growing bond as they go through this together.
One interesting story could be about Rosalie protecting Baby Bella from some unknown danger in the fanfiction world. Maybe it's a vampire from another coven who has some vendetta against the Cullens and Rosalie steps up to shield Bella.
One interesting fanfiction could be about how Emmett and Rosalie deal with the anticipation of becoming parents. Maybe they're worried about protecting the baby from their vampire world's dangers.
In some fanfictions, Bella might get a new tattoo after finding her mate, which in this case could be Rosalie. The story could revolve around how the tattoo represents their bond. It could be a magical tattoo that glows when they are near each other, signifying their special connection as mates.
One interesting plotline could be them bonding over a shared interest, like fashion. Rosalie's love for all things glamorous could rub off on Bella, and they could go on shopping sprees together. Another could be them facing a common enemy in the vampire world and having to rely on each other's unique strengths. For example, Bella's self - sacrifice nature and Rosalie's physical strength.
Another plot could involve Rosalie teaching Bella some of her more refined vampire skills, like how to move with extreme grace and elegance. This could lead to a deeper bond between them as Bella starts to understand Rosalie better. In the fanfiction, this newfound closeness might also stir some unexpected emotions among the other Cullens.
One possible plot is that Rosalie and Bella start to understand each other's perspectives better. Maybe Bella starts to see Rosalie's insecurities about her transformation and Rosalie begins to respect Bella's courage. This could be a story about mutual growth and acceptance between the two characters, with them sharing their experiences and learning from one another.
One interesting plotline could be how they navigate their relationship in a world full of vampires and werewolves. For example, they might face challenges from the Cullen family who have different views on their relationship. Another could be their journey to understand and accept their unique bond as mates, which might involve them going on adventures together to discover more about their vampire nature.
In some fanfics, male Bella might be a vampire hunter who initially targets Rosalie but then realizes she's not as bad as he thought. This creates a really interesting 'enemies to lovers' type of plotline.
In twilight Rosalie and Bella fanfiction, a great plotline could be Rosalie helping Bella adjust to her new vampire life in a more motherly way. Since Rosalie has been a vampire for a long time, she has a lot of knowledge and experience. Maybe she could help Bella with controlling her new powers and dealing with the emotional changes. There could also be a plot where they go on a journey together, away from the Cullen family for a while, to discover more about themselves and their place in the vampire world. This journey could bring them closer and make them see each other in a whole new light.
One interesting plot could be Rosalie teaching Bella how to be more confident in herself. Since Rosalie is strong - willed, she might pass on some of that strength to Bella. Another plot could involve Rosalie protecting Bella from the other vampires who might not be so accepting of a human in their midst at first.