Some fans would be outraged. Carlisle and Esme are a beloved couple in the Twilight series, and the idea of Carlisle cheating goes against the image many fans have of his character. They might see it as a desecration of the original story's relationships.
Perhaps in the fanfiction, Bella has a life - threatening situation and Carlisle, in his attempts to save her, becomes overly involved and his feelings cross a line. Esme, being the perceptive one, notices the change in Carlisle's behavior towards Bella. This could then set off a chain of events where the Cullen family has to choose sides or work to reconcile Carlisle and Esme.
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.
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.
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.
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.
There could be. Fanfiction writers like to take creative liberties with existing characters and relationships. But in the 'Twilight' series, Bella's relationship with Edward is central, and this kind of plot would be a major deviation. Some fans might write it to explore different character dynamics, but it may not be as common as more traditional fanfiction plots.