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.
One possible reaction could be shock. Carlisle might be momentarily stunned to see them in an unexpected situation. He could quickly compose himself and offer some words of wisdom or caution. For example, he might remind Edward to be extra careful with Bella considering her human nature.
No way. Writing about such private and inappropriate activities in fanfic is not only improper but can also have a negative impact on the image of the original work and its characters. Fanfiction should aim to enhance the story in a positive and appropriate way rather than including such inappropriate scenarios.
Together, they would likely try to make Renesmee understand that their relationship is special and that her presence is also special. They might give her a hug or some form of affectionate gesture to show that they are a family unit and that her walking in is just a normal part of family life, even if it was an intrusion on their private time.
One common theme is the family dynamic. Carlisle being the patriarch, his influence on Edward and Bella's relationship within the family framework is often explored. For example, in many fanfictions, he helps them navigate the difficulties of being part of a vampire family.
I really like 'A New Beginning in Forks'. In this fanfiction, Carlisle's wisdom has a great impact on how Edward and Bella handle the challenges in their relationship. It has a very engaging writing style that makes you feel like you're right there in Forks with them.
One negative impact is that it can be offensive to many fans of the original work. People who love the story for its positive aspects like the relationship and the characters' growth will be put off by such vulgar content.
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.
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.
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.