One common theme is unrequited love finally being realized. For a long time in the Pokémon show, their relationship was more of a comical partnership, but in fanfiction, the kiss can be a moment of that underlying love coming to the surface.
Well, there is definitely some 'jessie and james kiss fanfiction' around. If you're into more romantic - themed ones, you might find some where the kiss is a turning point in their relationship. Others could be more comical, like it happens by accident during one of their zany schemes in the Pokémon series.
One good fanfiction could be 'The Unlikely Kiss'. In this, Jessie and James might be in a situation where they accidentally kiss during a chaotic battle with Ash and his friends. It adds an element of surprise and changes their dynamic slightly. Another could be 'A Moment of Softness' where they share a kiss during a quiet moment of self - reflection, realizing their deeper feelings for each other.
Yes, there are likely many out there. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Jessie Luke and Jessie kiss' in the search bar, and you should be able to find relevant stories. However, the quality can vary greatly, so you might have to read through a few to find one that really suits your taste.
These fanfictions can make their characters seem more complex. A kiss between them shows a different side, not just the bumbling villains we usually see. It can make them seem more human, with real emotions.
One possible plot could be that Jessie and Luke are friends who gradually develop deeper feelings for each other. They might go through some adventures together, face some challenges that bring them closer, and finally share a kiss in a moment of realization of their love. For example, they could be working on a project and start to notice little things about each other that they find endearing.
They might love fanfiction because it offers new perspectives on their own lives. In fanfictions, their characters can be developed in ways that the original show might not have explored fully. For instance, they could be portrayed as more complex individuals with deeper backstories.
I'm not sure specifically as there could be many different versions of such a fanfiction. But generally, it might be about Ash coming to the rescue of Jessie and James in some sort of dangerous or difficult situation they are in within the Pokémon universe.