There are some. Some might focus on their friendship evolving into something more, while others could be more about Kiba having a secret crush on Sakura. It really depends on the author's take. You might have to sift through a bit to find the ones that really suit your taste, but it's worth the search.
You can try Archive of Our Own (AO3). It has a large collection of fanfictions, and by using the search function with 'kiba likes sakura', you should be able to find relevant stories.
Kiba is bold and impulsive, while Sakura is more level - headed and determined. In a marriage, Kiba might bring the spontaneity and Sakura would be the one to keep things in check. For example, Kiba could come up with wild ideas for dates or adventures, and Sakura would either find a practical way to make it happen or talk him out of it if it's too dangerous.
In a fanfiction, their pregnancy might bring about a change in their relationships with other characters. For example, their friends might be very supportive or, on the other hand, some might be jealous. It could also lead to them having to re - evaluate their roles as ninjas and how they will balance parenting with their duties.
I'm not entirely sure specifically as it depends on the individual fanfiction. It could be about a character named Kiba having an obsessive or following - type behavior towards Sakura within the context of a fictional story based on a particular anime or manga universe.
One characteristic could be that it often explores a non - canonical romantic relationship between Kiba and Sakura. It might also have a lot of emotional and physical tension written into the story. Since it's 'lemon', there could be some more intimate scenes described, but in a tasteful way depending on the writer.
Adventure is another theme. Fanfictions may send Sakura and Kiba on exciting quests together. They could be exploring new lands in the Naruto world, facing unknown challenges, and relying on each other's skills. Their different abilities, like Sakura's medical ninjutsu and Kiba's skills with his dog companions, can be combined in interesting ways during these adventures.
One common theme is friendship. Since Sakura and Kiba start as friends, their relationship often forms the foundation of the family - like bond in the fanfiction. They support each other, just like real friends do in a family.
One common theme is the discovery of unexpected love. They often start as friends or just comrades, and then gradually realize there's a deeper connection. Another theme is growth. Both Kiba and Sakura grow as individuals and as a couple through the experiences in the fanfiction.
A frequent theme is the growth of their relationship over time. It could start from a simple friendship or acquaintance and gradually develop into a deep love. Maybe they start off as comrades in a mission and then realize their feelings for each other as they face various challenges together. Another theme is the exploration of their unspoken feelings. In the original Naruto story, there's not much indication of a romantic relationship between them, so fanfictions like to explore what could have been if they had feelings for each other all along.