bella is dean and sam's sister fanfic

It could be demons. Demons are often the main antagonists in the Supernatural universe, and they might target Bella because she is related to the Winchesters. They could try to use her as a bargaining chip or a way to get to the brothers.

In some fanfics, there could be a plotline centered around Bella's love life in the context of being Dean and Sam's sister. Maybe she falls for another hunter, and the brothers have to approve or disapprove. There could also be a plot where Bella is haunted by a past event that only she remembers, and she has to rely on her brothers to help her figure out what really happened and how to move on.

Yes, there might be. The 'Supernatural' world of Sam and Dean and the 'Harry Potter' universe are both very popular, and fanfiction often likes to cross over different fandoms in creative ways. Some fans might have come up with the idea of making Harry Potter be related to Sam and Dean as their sister in a fan - created story.

One idea could be that Bella discovers she has special powers because of her relation to Sam and Dean. Maybe she can communicate with spirits in a unique way that helps them on their hunts.

Her character could develop in terms of her relationships. Maybe at first she has a bit of a strained relationship with Dean because he's overprotective. But over time, they grow closer as she proves herself. She could also form a strong bond with Sam due to their shared interests in research.

There's a fanfic called 'Sister's Bond'. In this story, the sister is brought into their lives in a rather mysterious way. It shows how she struggles to adapt to the life of hunting monsters while also trying to understand her new - found brothers. It's full of action and some really heartfelt moments between the siblings.

In a fanfiction, their sister could be a prophet. She starts having visions that lead the boys to new cases. But there are forces that want to use her for their own gain. Sam and Dean would have to fight not only the regular demons and ghosts but also those who are after their sister.

She could be a nephilim, half - angel and half - human. This would put her in great danger as both angels and demons would be after her. Sam and Dean would have to constantly protect her and figure out a way to keep her powers in check.

The relationship can be developed through shared experiences. For example, they could have a common hobby like reading. They can discuss their favorite books and exchange ideas, which deepens their connection. Another way is through facing difficulties together. If one of them gets sick, the other takes care of them, showing care and love.

Castiel is a complex and fascinating character in Sam and Dean's brother fanfic. He often serves as a sort of guide or protector for the brothers. His angelic nature gives him a unique perspective that contrasts with the more human viewpoints of Sam and Dean. He can be both aloof and deeply caring, which makes for interesting character dynamics.