First, understand Carlisle's character. He is noble, moral, and has a strong sense of self - control. Start with a situation that brings the reader and Carlisle together, like the reader moving to Forks. Then, build their relationship gradually. Maybe have them meet at the hospital where Carlisle works. Add some conflict, such as the reader being in danger from other vampires or the reader's family not approving of Carlisle. Keep in mind Carlisle's values as you write the story.
Some great Carlisle Cullen turns reader fanfictions include those that explore his moral compass in relation to the reader. For instance, in a fanfic where the reader is a bit of a rebel in the vampire world. Carlisle, being the moral and upright character he is, has to deal with his feelings for the reader while also trying to guide them. 'Carlisle's Unforeseen Love' could be one such fanfic. Also, 'The Reader and Carlisle's Secret Bond' might be about a hidden connection between them that they gradually discover, which changes their relationship in unexpected ways.
Well, it depends on the context of the fanfiction. Maybe Carlisle bites the reader to save their life. If that's the case, the reader would then be transformed into a vampire. They would likely be under Carlisle's guidance as he is known for his self - control and moral code. The reader could potentially become a part of the Cullen family, which has its own set of rules and relationships to navigate.
One common theme is the forbidden love aspect. Since Carlisle is a vampire and there are many differences between him and a human reader, it often creates a sense of forbidden attraction. Another theme is the idea of salvation. The reader might be in a bad place in life and Carlisle becomes a sort of savior figure.
You can start by looking on fanfiction.net. It has a large collection of Twilight - related fanfictions, including ones with Carlisle Cullen and the reader. Another good place is Archive of Our Own (AO3). It's known for its wide variety of fan works, and you're likely to find many different takes on this particular concept there.
One great fanfiction could be 'A New Beginning with Carlisle'. In this story, the reader character stumbles into the Cullen family's world and forms a deep connection with Carlisle. It beautifully explores their relationship development. Another one might be 'Carlisle's Unexpected Encounter' where the plot takes an interesting turn as the reader has a unique ability that catches Carlisle's attention.
Well, it shakes things up quite a bit. For one, Edward's relationship with Bella changes in a new way. They are now on more equal footing as vampires. The family has to adjust to having a new vampire in the house. Carlisle, as the head of the family, has new responsibilities towards Bella. He has to guide her in the vampire ways.
Another good one is 'The Doctor and I'. It delves deep into Carlisle's role as a doctor and how that affects his relationship with the reader. It's a bit more complex and detailed, with a lot of character development not just for Carlisle and the reader, but also for the side characters. It makes for a very engaging story.
One aspect of Carlisle Cullen x Bella fanfiction could be the exploration of their unique relationship within the Twilight universe. Carlisle is an old and wise vampire, while Bella is a young human. Fanfictions might delve into how Carlisle's self - control and moral code interact with his growing feelings for Bella. It could also show how Bella views Carlisle in a different light compared to Edward, perhaps seeing him more as a father figure or a source of guidance at first, and then developing more complex emotions.