In some fanfictions, they might kiss after a long period of misunderstanding. Jacob has been misinterpreting Bella's actions and vice versa. But when the truth finally comes out, they kiss as a way of sealing their new - found understanding and connection.
Another scenario could be that Bella does something that endangers Jacob's family or the werewolf pack. This would make Jacob see her as a liability and develop hatred towards her. In some fanfictions, she might accidentally expose the werewolves to their enemies because of her association with the vampires.
One possible scenario is that Jacob reveals a secret that Bella doesn't like. This could make her feel betrayed and start to hate him.
Sure, in certain fanfictions Bella ends up with Jacob. Sometimes, the fanfic writers rewrite the whole Twilight plot, making Jacob a more appealing character for Bella from the start. They might have Bella and Jacob meet under different circumstances that lead to a stronger bond between them right away. It could be something like Jacob saving Bella in a different way that makes her see him in a new light, and as the story progresses, their relationship blossoms into a romantic one.
Maybe they kiss in a secret hiding place within the Capitol. They are hiding from the Capitol's forces and in that moment of fear and closeness, their feelings overpower them and they share a kiss. This would add an element of danger and secrecy to their relationship.
Maybe it's a moment of passion after a long - awaited reunion. The characters are so overwhelmed with emotions that they can't wait to express their love and the wall is the nearest support as they passionately kiss. It could also be a situation where one character is protecting the other against the wall while kissing, showing both love and a sense of guardianship.
The fanfiction might explore their relationship by showing how their kiss is a culmination of a slow - burning attraction. It could be that they start as friends, but as time passes, the feelings grow and the kiss is the physical manifestation of that deepening bond.
In some fanfictions, it could be that they are caught by Hermione and Ron, which leads to a lot of teasing and awkward moments. For example, Ron might make a big fuss about it while Hermione tries to be more diplomatic.
Some fanfiction may focus on the lead - up to their kiss. It could describe in great detail how their relationship has been building up to that moment. For example, all the little glances, touches, and conversations that make the kiss seem like the natural culmination of their growing love for each other.
One interesting story could be where Jacob tries to convince Bella that she doesn't have to fully embrace the vampire life. He might show her all the beauty of the natural world she's about to lose. For example, he could take her to their old favorite spots in the forest. Another could be a story where Bella, as a vampire, has to protect Jacob from other vampires who see him as a threat because of his connection to her.
Well, in some Jacob and Bella lemon fanfiction, there's a plotline where they are forced to work together on a project for the reservation. This makes them spend a lot of time together and they start to see each other in a new light. Another plot might involve Bella getting injured and Jacob being the one to take care of her. During this time, their relationship deepens in a more tender and affectionate way. There are also stories where they discover a shared interest in a particular art form or hobby and bond over it.