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.
Often, it starts with an unexpected encounter or a moment of realization. Maybe Carlisle sees Bella in a new light, not just as Edward's girlfriend but as an individual with her own charm. Then, there are small gestures of kindness and understanding between them that gradually build up the relationship.
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.
At first, it would be a bit awkward as Bella adjusts to her new life. But Carlisle would be very patient and understanding, like a father figure. Esme would be more of a motherly presence, always there to comfort Bella. As time goes on, they would become closer. Carlisle might teach Bella about the vampire history and ethics, and Esme would share her love for the family and home. Eventually, they would have a very strong, loving bond.
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.
In some fanfictions, their relationship might develop through a series of adventures. For example, they go on a journey to find out more about Harry's mother and how she was involved with Carlisle. Along the way, they have to rely on each other, communicate, and understand each other's strengths and weaknesses. This mutual discovery and dependence would lead to a more profound and complex relationship between them.
Their relationship can be developed through shared experiences. For example, they could face a common enemy together. This would force them to rely on each other and understand each other's strengths and weaknesses.
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.
There could be Edward. Even though the focus is on Carlisle and Bella, Edward's presence might still be felt as he was an important part of Bella's life before. His reactions to Carlisle and Bella's relationship could add some drama.
If Carlisle reacts positively, like with a bit of humor or understanding, it could strengthen their relationship. Edward and Bella would feel more accepted in the vampire family. They might see Carlisle as an even more supportive figure and be more open with him in the future.
In certain fanfictions, Renesmee and Carlisle's relationship development is spurred by external factors. For instance, if the Cullen family faces a great threat, they have to rely on each other more. Renesmee might find herself depending on Carlisle's strength and experience, and Carlisle might be drawn to Renesmee's unique perspective. Through these trials, their relationship deepens, moving from a simple family - member - like connection to something more nuanced and perhaps even romantic.