He may say things like 'My love, you are with me now, and nothing can touch you.' Simple but powerful words to make Bella feel secure.
Edward could bring Bella a warm drink, like a cup of herbal tea. While she drinks it, he sits beside her and listens if she wants to talk about the nightmare. If not, he just stays there in silence, his presence being a great source of comfort. He might also wrap a warm blanket around her and keep her close to his cold but comforting body.
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.
Another possible location could be an old, abandoned church that has been restored just for their wedding. The stained - glass windows and high ceilings would create a very solemn and beautiful atmosphere. It could also have some kind of connection to Edward's past, like it was a place his family once visited long ago.
One popular 'edward and bella comfort fanfiction' is 'A Warm Embrace'. It focuses on Bella having a tough time at school and Edward being there to comfort her with his gentle words and protective presence.
The main appeal is the relationship between Edward and Bella. Their deep connection means that when it comes to comfort, it's very emotional. For example, Edward's ability to understand Bella's unspoken feelings makes for great comfort scenes.
Perhaps it's related to his internal conflict regarding his relationship with Bella. He might be feeling so much guilt about bringing her into the dangerous vampire world that he has a moment of self - destructive behavior where he almost kills her. Or it could be a plot device used by the author to create more drama and tension in the story, making the readers more engaged as they wonder how Bella will survive and how their relationship will recover from such a traumatic event.
Bella would likely be very frightened during the car incident. Once Edward saves her, she'd be extremely relieved and probably feel even more attached to him. Edward, on the other hand, would be initially worried and focused on getting Bella to safety. After saving her, he might feel a sense of relief as well, but also a bit of that over - protective feeling that he often has for Bella.
Another reason might be Edward's overprotectiveness. He could have made a decision for Bella without consulting her first, like preventing her from seeing a friend. This kind of controlling behavior could make Bella feel frustrated and end up in tears.
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.
In the 'bella is edward's pet fanfiction', the relationship is a creative and often controversial take. It could be that the author is exploring themes of dependency and power. Bella as a pet might symbolize her vulnerability and Edward's strength. However, this also raises questions about her agency. Does she have any say in things? Or is she completely at Edward's mercy? It can be a very complex relationship to unpack within the framework of the fanfiction.
One possible reason could be that some fans want to explore a different dynamic. In the original story, Edward and Bella are in love, but in this fanfiction, perhaps the writer wants to show a more complex relationship where Edward hates Bella. Maybe it's to add more drama or to explore an alternative storyline that goes against the typical romance.