In the original, Bella is often in a position of being protected by Edward. However, as his assistant in the fanfic, she may have more agency and be more involved in his world. She could be the one coming up with plans to solve problems or helping Edward make important decisions. This role reversal of sorts gives a whole new dimension to their relationship compared to what we see in the original Twilight story.
The original story focuses a lot on the forbidden love aspect due to Edward being a vampire. In the fanfic concept, that might still be there, but it takes a backseat to the new elements introduced by Bella's role as an assistant. For instance, in the fanfic, they might have to deal with office politics among the vampire community (if there is such a thing in the story world), or they could be on secret missions together related to vampire - human relations, which is very different from the simple love story in the original.
In the original story, Bella is mainly a student and Edward is a vampire who is attracted to her. But in the 'Bella is Edward's assistant' fanfic, their relationship is more centered around a professional dynamic. This changes the power balance and the nature of their interactions. Instead of the typical high - school - based romance, it's more about a work - related relationship where they have to be more formal with each other at times.
The original story is more about the build - up of their relationship, while the mating fanfic may jump straight into the more intense and complex parts of their relationship regarding mating. It might also introduce new elements that were not as prominent in the original, like certain rituals or deeper emotional connections that are specific to the mating concept.
In fanfiction, the stories can deviate from the original plot. For example, some fanfictions might change the ending. In the original Twilight, the ending was a certain way, but in fanfiction, Bella and Edward could end up in completely different situations.
The fanfiction might deviate from the original by focusing on their married life more intensely. In the original Twilight, a lot of the story was about their courtship and the challenges they faced getting together. In 'the perfect wife' fanfic, it could be about how they make their marriage work. There might be new characters introduced who are part of their married life, like vampire neighbors or family members that we didn't see much in the original.
The original story focuses a lot on the supernatural elements and the challenges they face as a vampire - human couple in the long run. But in the one - night stand fanfiction, the focus might be more on the immediate emotional and physical consequences of that one encounter. It could explore how this changes their perception of each other in a very different way compared to the gradual development in the original.
The male Bella Swan in the fanfic might face different expectations from society within the story. In the original, Bella had to deal with being the new girl in town. As a male, he might have to deal with different social hierarchies, like being part of male groups or facing different forms of competition. This would also impact the overall plot.
The female Slenderman fanfic differs from the original in several ways. First, the appearance is likely to be different. A female Slenderman might be depicted with more feminine features, which changes the visual impact. Second, the relationships she has with other characters could be distinct. She may form different kinds of alliances or enmities. And finally, the fanfic may approach the horror in a more psychological way. Instead of relying on the brute - force - fear of the original Slenderman, it could play on more nuanced psychological fears related to female power and mystery.
In fanfiction, the Eclipse bedroom scene might be more elaborated on the emotions. For example, a fanfiction author could add more internal monologues of Edward and Bella, showing their thoughts in more detail compared to the book.
The original Edward is very proper and controlled. However, in 'bad boy edward fanfiction', he can be impulsive. He might engage in activities like getting into fights or taking risks that the original Edward would never do. This makes for a very different dynamic with Bella as well. Instead of the slow - burn, gentlemanly courtship, it could be a more fast - paced, passionate relationship filled with arguments and reconciliations.
In the original story, Bella doesn't really have any powers until she becomes a vampire. But in fanfic, her powers can be very different. For instance, she could have pre - transformation powers like the ability to sense danger from a distance, which is not in the original at all.
In the fanfiction from Edward's POV, we get a more in - depth look at his emotions. The original story focuses more on Bella's perspective. For instance, we might see how Edward really felt during certain key moments that were only briefly described in the original.