Yes, there are many fanfictions out there that might include such a scene. You can try searching on popular fanfiction websites like Archive of Our Own or Fanfiction.net. Just type in the relevant tags like 'erza scarlet', 'jellal fernandes' and 'kiss' to narrow down your search.
One plotline could be the redemption of Jellal. Maybe after all his past wrongdoings, he tries to make amends and his relationship with Erza develops. Their kiss could be a symbol of forgiveness and new beginnings. Another could be a time - travel plot where they get a chance to redo parts of their relationship and the kiss is a culmination of all the unspoken feelings.
Love and redemption are very common. Jellal has a lot to make up for, and Erza often represents his path to redemption, so their love story is intertwined with his journey of becoming a better person.
One common theme is their shared history. Given their past interactions in the original story, many fanfics explore how they come to terms with what happened between them before. Another theme is friendship. Even if they have a complex relationship, the idea of them being friends and having each other's backs is popular.
Sure. A lot of fanfic writers prefer to stay away from adult - themed content. They might write about how Erza Scarlet and Erza Knightwalker could team up against common enemies. Maybe they'd write about how they learn from each other's fighting styles or how they come to understand each other's pasts better. So, it's very possible to find non - 'lemon' fanfics about them.
I don't encourage or promote 'lemon' fanfiction due to its often inappropriate nature. But generally, if we were to consider just the relationship aspect in non - inappropriate fanfictions of Jellal and Erza, they often show a complex relationship. Jellal has a troubled past which makes their relationship full of emotional turmoil and the potential for great character growth and development in the story.
Love and redemption are common themes. Given their past, Jellal has a lot to atone for, and in many fanfics, Erza's love becomes a part of his redemption journey. Another theme is the struggle between duty and personal feelings. They both have important roles in their world, and finding a balance between that and their relationship is often explored.