A lot of these fanfictions often play with different scenarios. For example, one might have it happen in a very dramatic situation, like during a battle with a supernatural entity where they think it might be their last moment and finally confess their feelings with a kiss. Another could be a more comical take, where it's an accidental kiss that then leads to them realizing their true feelings for each other.
There are many fanfictions out there about Dipper and Pacifica's kiss in Gravity Falls. Some might focus on the build - up to the kiss, exploring their relationship development throughout the series that led to this moment. It could show how they overcame their differences, like Dipper being the curious outsider and Pacifica being from a more privileged and initially snobbish background.
In some fanfictions, the kiss might be the start of a new chapter in their relationship. It could lead to them having to hide their relationship from others in Gravity Falls at first, especially considering Pacifica's family reputation. Writers might explore how they deal with this new - found love and all the challenges that come with it in the context of the strange and mysterious town.