Well, a common plotline is Bella's discovery of new vampire senses. In fanfiction, it could be that she discovers she has a unique sense that other vampires don't have, like being able to sense the emotions of humans from a great distance. Also, there could be a plot where Bella has to hide her new vampire self from her human family and friends, which creates a lot of tense and emotional moments as she tries to keep her double life a secret.
A third plotline might be that Bella and Edward face a new kind of threat to their vampire family. Maybe a group of powerful and evil vampires from a far - off land come to Forks, and they have to use all their skills and the help of their friends to protect their family and way of life.
One interesting plotline could be Bella discovers Edward's vampire nature in a more dramatic way than in the original. For example, she might witness him using his super speed to save her from an immediate danger like a speeding car. Another could be that Edward is initially more hesitant to be around Bella because he fears his vampire instincts more strongly, creating more tension in their relationship.
Often, one interesting plot point is how Bella acquires the knowledge or power to turn Edward. Maybe she discovers an ancient spell or some new vampire lore. Another point could be Edward's initial reaction. He might be shocked, angry, or even a bit excited at the prospect of a new existence.
Often, other vampire clans that oppose Bella's transformation can be the main antagonists. They might see her as a threat to the vampire world order. For example, a traditionalist clan that believes humans should not be turned so easily could try to harm Bella or drive her away from Edward.
One interesting plotline could be about how their vampire nature affects their relationship in non - sexual ways. For example, their enhanced senses might lead to different ways of communicating emotions. Another could be their exploration of the vampire world together, like learning about vampire traditions and how that strengthens their bond without focusing on sexual aspects.
One interesting plot could be Bella's struggle to control her new vampire instincts. For example, she might have a hard time dealing with her sudden urge for blood while trying to maintain her relationships with her human friends and family. Another plot could be her discovery of new vampire powers that are unique to her. Maybe she can do something no other vampire can, like communicate with animals on a deeper level.
Well, in some 'Buffy turns into a vampire' fanfiction, there could be a plot where Buffy has to deal with the rejection of her friends at first. But then they realize that she's still Buffy deep down. Also, she could team up with some vampires who oppose the more evil ones, using her new vampire abilities for good in a way that no one expected.
Some fanfictions might have a plotline where Bella and Edward face challenges related to their new married life during the honeymoon. For instance, they have to figure out how to balance their different needs. Edward, being a vampire, has different sleeping patterns and dietary requirements. Bella, on the other hand, is still adjusting to her new life as a vampire's wife. This creates some interesting situations and conflicts that they need to resolve together.
One possible plotline could be that Edward returns after a long absence and finds Bella has changed in unexpected ways. Maybe she has developed new powers or a stronger sense of self. Another could be that they reunite in a dangerous situation, like facing a new vampire threat together, which forces them to re - evaluate their relationship.
One interesting plotline could be the inclusion of unique wedding traditions from different cultures. For example, incorporating a Celtic hand - fasting ceremony along with their traditional wedding. Another could be the appearance of unexpected guests, like long - lost relatives or old friends from their pasts that add drama and new interactions.