One possible plot could be that Paul believes Bella has some special power or knowledge that he desperately needs. So, he kidnaps her in order to extract that information from her. However, as time passes, he starts to develop some unexpected feelings for her, which complicates the whole situation.
It could be that the real antagonist is the situation or the world they live in. For example, if they are in a post - apocalyptic world where resources are scarce, Paul might kidnap Bella to ensure his own survival or the survival of his group. In this case, the harsh environment is the main driving force behind the antagonistic act.
Well, in a fanfiction like this, it could start with Bella and Paul already in a relationship. When they discover the baby is on the way, they decide to move in together to prepare for the new arrival. Paul might start taking odd jobs to earn extra money for the baby. Bella could be documenting the whole pregnancy journey in a diary. And as the due date approaches, they might have a baby shower organized by their closest friends, and finally, the baby is born, bringing a new kind of joy to their lives.
Maybe Paul is having trouble controlling his werewolf side and Bella, with her knowledge of the supernatural world, tries to help him. For example, she could use her connection to the Cullens to find a way to soothe Paul's inner turmoil.
In the fanfiction, it could be that they fight due to differences in their beliefs or values. Bella, with her human - turned - vampire mindset, might have different ideas about how to deal with certain supernatural situations compared to Paul, a werewolf. Their clashing views could result in a physical or verbal fight as they both try to impose their own ways of handling things.
Another idea is that the fanfiction could be a dark, alternate universe story where Jasper has turned evil. His reasons for kidnapping Bella could be tied to some sort of revenge plot against the Cullens. He might hold a grudge against them for something that happened in the past, and Bella is just a means to get back at them. This would create a very different dynamic compared to the original Twilight story.
One possible plot development could be that they face challenges in their relationship due to the unexpected pregnancy. Maybe there are family or social pressures.
One possible plot twist could be that Paul is actually working for an enemy of Bella's family in secret, and his initial meeting with Bella was part of a plan. But then he starts to have real feelings for her and has to decide between his loyalty to his side and his new - found feelings.
One possible plot could be that Bella and Paul face family opposition at first. Maybe their families have some long - standing feud or different social statuses. But through their love and determination, they gradually make their families understand and finally have a grand wedding with all their loved ones present.
Well, perhaps Bella and Paul are in love but their families or society don't approve. So, they run away together. They could face many challenges on their journey, like finding food and shelter. Along the way, they might meet some kind people who help them, or they could run into some thieves. But their love for each other gives them the strength to keep going.
Well, it could be about Paul and Bella's adventure in a lemon orchard where they face some rough challenges like bad weather affecting the lemon harvest. Maybe they have to work together to save the orchard.