One alternative is to focus on their family - like relationship. Carlisle could be portrayed as mentoring Bella in her new vampire existence, like teaching her about self - control and the history of their kind. This would stay true to the nature of their characters in the original work.
In the fanfiction, Carlisle's sense of duty to his family and the vampire code might be a hurdle. He has to balance his feelings for Bella with his responsibilities to the Cullen family. Also, Bella's own human life and her relationships with other humans, like her father, could be a complication. How can she maintain those relationships while being in love with Carlisle? There's also the issue of secrecy. Their relationship has to be kept hidden from the outside world to protect both of them.
There could be a 'bella and carlisle friendship fanfiction' which focuses on the deep bond of friendship between them. It can explore how they support each other through different challenges in the story world.
You could write about their intellectual battles or power struggles. For example, how they might outwit each other in a strategic situation. This would keep the focus on their characters' traits and the dynamics of their relationship in a non - sexual way.
In some fanfictions, their relationship might start with Carlisle being drawn to Bella's unique spirit. He, as an older and more experienced vampire, is intrigued by her resilience. Maybe he first notices her when she enters the Cullen family's orbit, and from there, a slow - burning attraction begins to form as they interact more and get to know each other on a deeper level.
No. In the original "Twilight" series, Bella is in a relationship with Edward, and Carlisle is more like a father figure. Writing such fanfiction goes against the original intention of the story and may also violate the ethical and moral boundaries of the fanfiction community.
He becomes more vulnerable. Usually, Carlisle is seen as this strong, composed leader. But when he falls in love with Bella, his emotions start to get the better of him at times. He might second - guess his decisions more often.
The Cullen family members are important characters too. Edward, for example, might have an interesting dynamic with Bella in this fanfiction. He could be either protective or jealous of Carlisle's special relationship with her.
You can write about their friendship and how it developed into love. Explore their conversations, their shared interests, and how they support each other. This way, you can still create an engaging fanfiction without going into inappropriate sexual territory.
One common theme is the exploration of forbidden love. Since Carlisle is an older vampire and Bella is a human (initially), their relationship goes against the norms of both the vampire and human worlds.
In such fanfiction, the slow - burning aspect of their love is significant. It's not instant but builds over time. Carlisle's restraint as a vampire who has lived for a long time and Bella's growing understanding of his world create a unique dynamic. Also, the idea of Bella being a bridge between Carlisle and the human world he once knew can be an important part of the story. It gives a sense of connection and nostalgia for Carlisle, which deepens his feelings for Bella.