Yes, there are quite a few. You can start by looking on popular fanfiction websites. Some might focus on their relationship dynamics in the context of the original story's world, exploring how their different personalities interact.
Well, it could be a number of things. Maybe she faces some challenges, has a major life change, or discovers a hidden truth. But without reading the specific novel, it's hard to say for sure.
Another option is Tumblr. There are often fanfic writers who post their works there, and you might be able to find some Himeno x Denji fanfiction by searching relevant tags or following the right blogs.
I haven't read this specific fanfiction, but usually, in fanfictions about Himeno and Hayate kissing in Pretear, it might explore their relationship deeper. It could be a sweet moment of their romantic connection, perhaps a turning point in their story where their feelings are more openly expressed.
One possible take on this could be that in the fanfiction, Hikari and Kei's pregnancy might be a central plot point to explore their relationship in a deeper way. It could show how they grow together as a couple, facing the challenges of impending parenthood.
Often in fanfiction, Naruto Hibiki Hikari are characters that are used to explore different aspects of the Naruto world that the original series didn't fully cover. They can be used to create new romances, friendships or rivalries within the ninja community. Maybe Hibiki has a crush on one of the original female characters and Hikari is his wingman, all while Naruto is caught up in his own adventures.
Obviously, Naruto and Hikari are the main characters. Naruto is the well - known protagonist from the Naruto series with his dreams of becoming Hokage. Hikari is a character created for the fanfic, who often has unique traits and abilities that interact with Naruto's character in different ways.