Well, it's not likely to be a very popular concept. The idea of one character being another's slave goes against the positive and equal relationship that many fans expect in the 'Twilight' universe. Most fans are drawn to the romantic and somewhat equal relationship between Bella and Edward in the original story.
One possible reason is that the writer wants to explore the psychological aspects of such an unequal relationship. How would Bella feel, being in a position of slavery? How would Edward handle this extreme power? But it's important to note that this concept is quite controversial and not in line with the general positive tone of the 'Twilight' story.
It's not appropriate at all. Fanfiction is a platform for fans to show their love for the original work through creative writing. However, 'bella and edward sex slave fanfiction' involves a demeaning and immoral concept. It can also make other fans uncomfortable and is not in line with the spirit of positive fan culture.
It promotes unethical and immoral ideas. It objectifies characters and goes against the values of respect and equality that should be present in any form of literature.
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.
It redefines it by making it unequal. Bella is in a position of being 'owned' in a sense, which is a huge change from their normal relationship where they are more like equals in love.
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.
Bella often becomes more confident in her relationship with Edward as his wife. She may be more assertive in making decisions for their future together.
Sometimes in fanfiction, Bella might be more assertive when they meet. Instead of being the shy girl, she could be the one to initiate the conversation. This change in her personality can lead to a different dynamic in their relationship from the start.
Perhaps in this fanfiction, the workplace setting becomes a backdrop for a forbidden love story. Bella might initially be intimidated by Edward's position but then discovers his softer side. It could also lead to some interesting plot twists, like office rumors and jealous coworkers trying to create problems for their relationship.