A possible plot could be Bella dealing with the unique growth and development of her vampire children. Since they are not human, their emotional and mental growth might be different. Bella could struggle with how to instill values like compassion and kindness in them, especially when their natural vampire instincts might lead them in a different direction.
Maybe a plot where Bella is trying to protect her vampire children from other vampire clans who see them as a threat. This could involve a lot of action and strategy on Bella's part, as she uses her knowledge of both the human and vampire worlds to keep her family safe. She might even have to form alliances with some unexpected vampires to ensure their safety.
One interesting plot could be Bella having to teach vampire children about the human world in a way that they can understand without revealing too much. For example, she might tell them stories of holidays like Christmas, which are so different from their vampiric existence.
It also makes her more patient. Vampire children, or even adult vampires she might be mothering in the fanfiction, can be difficult to understand and manage. Bella has to learn to be patient with their different ways of thinking and behaving. For example, if they don't understand human emotions like love in the same way, she has to patiently explain it to them.
One interesting plot could be Bella developing a new power while living with the Cullens. For example, she might gain the ability to communicate with animals like some of the other vampires. This would add a new dynamic to her relationship with the Cullens and also pose new challenges and adventures as they try to keep it a secret from the outside world.
There could be a plot where Bella has a premonition about a danger that's going to befall the wolf pack. She then tries to convince them of the impending threat, but they are hesitant to believe her at first. Through her determination and the evidence she manages to gather, she eventually gets the pack to take her seriously and they all work together to face the danger.
In some of these fanfictions, one plot could be that Bella's kidnapping is part of a scheme by a new vampire coven that wants to use her as bait to lure Edward. They might think that by having Bella, they can draw out Edward and his family and then overpower them to take over their territory.
One interesting plot could be where Jacob and Bella go on a secret adventure in the forest together. They discover a hidden part of the forest that has a special meaning to the werewolves. It could involve them facing some small challenges like crossing a rapid stream or finding their way back when they get lost.
Perhaps a plot where they embark on a journey to discover the origin of their Futa existence within the Twilight universe. This could involve meeting ancient vampires or other supernatural beings who hold the key to their transformation. They would face many challenges and learn more about themselves along the way.
In some fanfictions, Bella might develop a special friendship with Zafrina. Zafrina could teach Bella some of her unique skills, like enhancing her mental shielding in a different way. This could lead to Bella having a new level of power and confidence that she didn't have before in the original story.
One interesting plot could be Bella's struggle to control her new vampire powers. She might face difficulties in adjusting to her heightened senses, like being overwhelmed by the smell of blood. Another plot could involve her relationship with Edward. Since she's now a vampire, their dynamic might change, and they could face new challenges together.
In this fanfiction, there could be a plot where Bella has to deal with the reactions of the other vampires. Some might be very confused or even hostile towards her new role as Edward's mother. She would have to navigate these complex relationships while also coming to terms with her own new identity within the vampire world.
In some fanfictions, Bella might be kidnapped by a new vampire species that is trying to understand the relationship between humans and vampires. They see Bella as an important specimen since she is so deeply involved with the Cullens. So, they take her away to run tests on her, not with any malicious intent initially but more out of scientific curiosity. Another idea is that a witch or a magical being in the Twilight universe kidnaps Bella. They might believe that Bella's connection to the vampires has some sort of magical significance that they can use for their own gain. For instance, they could think that her blood has some special property that can enhance their magic. A more simple plot could be that a human who is jealous of Bella's relationship with Edward kidnaps her. This human might be someone who has a crush on Edward and thinks that by getting rid of Bella, they can have a chance with him.