One common theme is the struggle between their different natures. Carlisle is a vampire with centuries of experience and Bella is a young human - turned - vampire. Another theme is the idea of forbidden love, as their relationship might not be seen as conventional within the Twilight world. And the theme of self - discovery also often comes up as they learn more about themselves through their relationship.
One common theme is the exploration of their relationship in different universes. For example, in some fanfics, they might be in a world where the vampire - human rules are different.
One common theme is the exploration of complex relationships. Since Bella, Esme, and Carlisle have different personalities and roles, fanfics often dig into how they interact and relate to each other on a deeper level.
One common theme is family. Since Carlisle and Esme are like Bella's adoptive parents in the vampire family, many fanfics explore how they build a family unit. Another theme is protection. Carlisle as the patriarch and Esme as the matriarch often have to protect Bella from various threats in the vampire world.
One common theme is the struggle against the norms of the Twilight world. Since Bella was initially in love with Edward, the idea of her being mates with Carlisle goes against the expected relationships. Another theme is the exploration of eternal love. As vampires are immortal, their mate bond is supposed to be eternal, and fanfics often focus on how Carlisle and Bella deal with this eternal connection.
One common theme is the forbidden love aspect. Since Carlisle is a much older vampire and Bella is a young human, there's that sense of something not being allowed, which adds a lot of tension to the stories.
A frequent theme is the exploration of Carlisle's self - control. In fanfictions, his struggle to maintain his composure around Bella, especially given her alluring blood, is often highlighted. Also, the theme of Bella's growth and transformation under Carlisle's influence is common. She may become more confident, more in - tune with the vampire world, and this transformation is central to many stories.
Common themes in such fanfiction include the discovery of a deeper connection. Bella might initially be in love with Edward but then realize that her true soulmate is Carlisle. There's also the theme of Carlisle's struggle with his own moral code when it comes to loving Bella. He's always been so strict about his values, and this new - found love could make him question some of his long - held beliefs. Additionally, the idea of their love being a catalyst for change within the vampire community is often present, as they might inspire others to look at relationships and values differently.
One common theme is the exploration of family dynamics. Since Carlisle is sort of the father figure in the Cullen family, fanfictions often look at how he accepts or influences Bella's relationship with Edward within the family structure.
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 major theme is the disruption of the status quo. The pregnancy shakes up the normal order of things in their world. It also often involves the theme of protection. Carlisle, being a protective figure, will do everything he can to protect Bella and the unborn child. And there's the theme of identity. How does this pregnancy change who Bella and Carlisle are? Are they still the same people? How do they see themselves now that they are about to become parents? These are all questions that the fanfictions often explore.