In Jasper Whitlock and Bella Swan lemon fanfiction, the writers usually try to add their own spin to the relationship between the two characters. They might explore Jasper's vampire nature in relation to Bella's human allure in a more explicit way compared to the original story. This can be interesting for some readers who are looking for a different take on the characters. However, it's also a genre that can be polarizing. Some people love the creative liberties, while others prefer to stick to the more traditional interpretations of the Twilight saga.
The popularity might also stem from the fact that it allows for a break from the traditional narrative. In the original Twilight, there are certain boundaries and storylines. But in lemon fanfiction, writers can bend and break those rules. They can create scenarios where Jasper and Bella's relationship is more passionate and intense. This appeals to readers who want something more than what the original books offered. Also, the idea of exploring the vampire - human relationship in a more sensual context is something that draws in many fans of the genre.
One common theme is the exploration of an alternative relationship. Since in the original Twilight story, Bella is mainly with Edward, fanfictions often explore what could be between her and Jasper. Another theme is Jasper's past and how it affects his relationship with Bella. His experiences as a vampire in different eras are often delved into.
I'm not sure who the 'best' is as it's subjective, but some popular authors might be those who have a large number of followers and positive reviews. You can check on fanfiction platforms like FanFiction.net or Archive of Our Own to see which authors are highly rated for their Jasper and Bella stories.
In major jasper whitlock and bella swan fanfiction, a frequent theme is the struggle between good and evil. Jasper has his past as a Confederate soldier which can be seen as a darker part of his history, and Bella represents a more innocent, good side. Their relationship can be a battleground for this struggle. Another theme is the concept of family. How Bella fits into the Cullen family with Jasper being part of it is often explored. And finally, the theme of sacrifice. How far will Jasper or Bella go to protect or be with the other is a common exploration in these fanfictions.
A plotline could involve Jasper and Bella forming a closer bond as friends first. They might start sharing their deepest fears and secrets, which in turn leads to a different kind of relationship. For example, they could confide in each other about their struggles with being a vampire (Jasper) and being in a world full of the supernatural (Bella). This could gradually develop into a romantic relationship that is based on a strong foundation of friendship and mutual understanding.
The Volturi could be main antagonists. Since they have strict rules about vampires and humans, they might see Bella and Jasper's relationship as a threat to their order.
Sure. There's a fanfiction where Bella discovers a hidden side of Jasper's past and it changes their relationship in unexpected ways. The title is 'Jasper's Hidden Tales'. It delves deep into Jasper's history and how that impacts his connection with Bella. Then there's 'Bella and Jasper's Unlikely Alliance' which is about them teaming up for a common cause that has nothing to do with the main Twilight plot, and it's really engaging.
The difference in their natures could be a big challenge. Bella is a human (at least initially in most Twilight - related stories), and Jasper is a vampire with a very different set of instincts and experiences. Their mating would require them to bridge this gap, whether it's in terms of physical needs (like Jasper's need for blood) or emotional needs. For example, Jasper may be more guarded and battle - hardened, while Bella is more naive and idealistic in some ways.
Another plot could involve some sort of danger that forces them together. For example, a new threat to the vampire clans that requires their combined skills. Jasper's combat and leadership abilities along with Bella's unique connection to the different supernatural elements could be the key to fighting this threat. As they face this danger side by side, their feelings for each other intensify and lead to a mating bond.