In this fanfiction concept, it would completely change the dynamics of the Twilight story. Bella being Esme and Carlisle's daughter would mean a different kind of family relationship within the Cullen family. For example, her relationship with Edward would be that of siblings rather than lovers. It could also lead to different story arcs regarding her powers and how she fits into the vampire world. There could be new conflicts and alliances based on this new family connection.
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.
The plot could center around Bella's role in the Cullen family's relationships with other supernatural beings. As Esme and Carlisle's daughter, she has a certain status. She could try to bridge the gap between the Cullens and the werewolves in a more official capacity. This could involve her facing opposition from within her own family as well as from the werewolves, but she perseveres in her attempts to create peace.
One great fanfiction is 'The Cullen Family Bonds'. It beautifully explores the relationships between Carlisle, Esme, and Bella. It shows how Carlisle's wisdom and leadership in the family interact with Esme's nurturing nature, and how Bella fits into their world. It has some really touching scenes that make you feel like you're part of the Cullen family.
One common theme is family. Since they are all part of the Cullen family in the Twilight universe, many fanfictions explore how they interact as a family unit. For example, how Carlisle and Esme act as parental figures to Bella.
A plot that stands out is when they all go on a journey to discover more about their vampire heritage together. This allows for a lot of character development and interesting interactions. For example, Carlisle can share his long - held knowledge, Esme can offer her emotional support, and Bella can bring her unique perspective as a new addition to the vampire world.
Carlisle would probably be very calm and composed. He might give Bella a reassuring smile and say something like 'It's all right, Bella.' Esme, on the other hand, might look a bit flustered at first but then quickly regain her composure and act as if nothing out of the ordinary had happened.
Typically, the relationships between the characters are a key element. It could be the unspoken tensions or the deep - seated affections they have for each other. Also, the way their different personalities interact, like Bella's naivete, Esme's motherly nature, and Carlisle's calm leadership.
In the fanfiction, Carlisle and Esme's love is often depicted as a deep and eternal bond. Carlisle, being a kind - hearted vampire, found Esme in a desperate state. He saved her life by turning her into a vampire. Their love grew over time as they shared a similar view of life. They found solace in each other's company and supported one another through the challenges of their vampire existence.
In these fanfictions, Carlisle could develop by becoming more involved in the family on an emotional level. He's always been a bit reserved, but the pregnancy could break down some of those walls. Esme might grow in confidence as she realizes she's bringing new life into the family. She could also become more assertive in protecting the unborn child, which is a new side to her character. As they go through this journey together, their bond as a couple could strengthen, and they might start to understand each other in ways they hadn't before.