No. Creating fanfic with inappropriate or sexual content related to a character like Jessie from Pokemon is not acceptable. It goes against the family - friendly nature of the Pokemon franchise and can be considered disrespectful to the original work and its fans.
Maybe a fanfiction where Jessie and James discover a rare and powerful Pokemon that has the ability to grant wishes. But they have to go through a series of challenges set by other mysterious Pokemon to earn the right to make a wish. This could lead to a lot of character development as they face their own greed and learn about true friendship along the way.
A fanfic about Jessie starting her own Pokemon - friendly cafe could be great. She could use her knowledge of Pokemon to create special treats for them and their trainers. It would be a fun and positive story that focuses on her creativity and love for Pokemon in a different way.
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.
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.