A simple plotline could be that Bella's sickness is just a normal flu, but it makes her realize how much she depends on those around her. She might have a moment of self - reflection while lying in bed sick. She could also receive some unexpected help from a stranger who turns out to be an important character later in the story.
One possible plotline could be that Marcus discovers Bella's blindness and is initially hesitant about their relationship but then grows to see it as something that makes her unique and special. He might then become very protective of her.
In some 'Naruto Rias sick' fanfiction, it could be that Rias is cursed by an enemy. Naruto, being the hero he is, feels responsible for helping her. He uses his knowledge of chakra and seals to try and break the curse. Meanwhile, Rias is weak from the curse and her devil powers are waning. As Naruto delves deeper into finding a solution, he uncovers secrets about both worlds that are related to the curse. This could lead to a series of adventures where they have to overcome various obstacles together, all while Rias is struggling with the effects of the sickness.
Well, perhaps she is a metahuman in a world where there are different factions of metahumans. Bella could get caught in the middle of a power struggle between these factions. Maybe she has to decide which side she wants to be on, all while trying to understand and control her newfound powers. She might also meet other metahumans who become her friends or mentors and help her on her journey of self - discovery as a metahuman.
One possible plotline could be that Bella starts smoking as a form of rebellion. Maybe she's feeling suffocated by the expectations around her in her usual story setting, and smoking becomes her way to assert her independence.
In some fanfictions, the plot could involve Bella trying to resist Quil's imprinting at first. She could be scared of the implications it has for her future and the future of those around her. As time passes, though, she might start to see the good in Quil and his intentions. Meanwhile, Quil would be doing everything he can to protect and be close to Bella, which could lead to various adventures and challenges as they face threats from both the vampire and werewolf sides of the Twilight world.
One possible plotline could be Bella's discovery of her witch powers. Maybe she's an ordinary girl until one day strange things start to happen, like objects moving on their own or she has premonitions. Then she has to figure out how to control her powers and where they came from. Another plot could involve her using her powers to protect her loved ones from a dark magical force. For instance, a powerful dark wizard is after her family, and she has to use her new - found witch abilities to fight back.
Another plot could be that they are on opposite sides of a conflict initially. But as they realize they are mates, they have to find a way to reconcile their differences and work together. This could involve a lot of internal struggle for both of them as they deal with loyalty to their respective sides and their new - found bond.
A possible plotline is that Bella gets involved in a love triangle with two other ballet dancers. One is her long - time partner in the ballet troupe, and the other is a new, mysterious dancer who has joined. Her feelings for them both are complicated by her love for ballet and her ambition to succeed in the ballet world. There could also be a plot where Bella's family doesn't support her ballet dreams at first, but she has to prove to them how important ballet is to her.
One possible plotline is that Bella uses her new - found power to seek revenge on those who once threatened her or her loved ones. Another could be that she tries to unite different vampire groups with her power and charisma. Maybe she discovers a hidden vampire ability that no one else has and uses it to change the vampire world for the better.
One possible plotline could be that Bella and Marcus form an unexpected friendship. They might start sharing secrets and helping each other out in a world full of challenges. For example, Marcus could be in some kind of trouble and Bella uses her unique perspective or skills to get him out of it.