Their relationship develops as Edward imparts his knowledge to Bella. Since he's her master, he has a certain authority. But as time passes, Bella might start to question some of his decisions, which adds tension and also deepens their relationship as they work through these issues.
In many such fanfictions, Edward might use his superhuman speed to reach Bella just in time. He could have sensed her danger through his vampire instincts and dashed to the cliff edge, grabbing her before she falls.
Alice is often a very popular character. Her ability to see the future can add an interesting element to the wedding planning. For instance, she might foresee some problem with the wedding dress or the weather on the big day and try to prevent it. Jacob also makes an appearance in some fanfictions. His presence can create some tension as he still has feelings for Bella.
Well, it makes their relationship more paternal. Edward becomes more of a guiding force rather than just a love interest. He might scold Bella when she does something dangerous, like in the original when she gets into trouble with vampires, but in a more fatherly way.
For Edward, there's likely a mix of relief and fear. Relief because he's finally expressing his deep love for Bella, but fear because he's exposing his true feelings and also worried about how this will change things. For Bella, she's probably mostly filled with excitement and a bit of shock. The excitement of this new level of intimacy with Edward, and the shock that this moment she might have dreamed of is actually happening.
Alice is often quite popular. She has the ability to see the future, which can add a lot of interesting twists to the story. For example, she might see a danger coming towards Bella and Edward and try to prevent it. Her quirky personality also makes her a favorite among fans.
Carlisle is another character that many might like. As Edward's father figure, he can offer wisdom and guidance to the newlywed couple. His calm and ethical nature can play an important role in helping Edward and Bella navigate any difficulties that come up in their married life, such as dealing with vampire politics or ethical dilemmas.
At first, it might be a bit rocky. Since the marriage is by treaty, they may be a bit wary of each other. But as they start spending time together, they could begin to discover common interests. For instance, they might both be interested in a particular type of literature or music, which helps to break the ice.
Edward could start by gently waking Bella up from the nightmare. Then, he would wrap his arms around her and sing a soft lullaby that he might have learned over the years. He would stroke her hair and look into her eyes, assuring her that it was just a bad dream and that he is right there with her, and that no harm will come to her as long as he is around.
Bella arrives in Forks. Edward, a mysterious and alluring vampire, catches her eye. Their relationship develops gradually. Edward's family accepts Bella to an extent. They face difficulties such as the Volturi, a powerful vampire coven, who are interested in Bella because of her knowledge of vampires. Edward and Bella's love endures through it all. They get married and Bella becomes a vampire herself, which is a major turning point in their story as they can now be together forever in a new way.