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.
One idea could be exploring how their friends in the village react to the news. For example, Naruto might be overly excited and start planning all kinds of baby - related things for them. Another plot could focus on how Kiba and Sakura adjust to the idea of becoming parents. Maybe Kiba has to learn to be more gentle and Sakura has to deal with her own insecurities about motherhood.
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.
Adventure is another theme. Kiba and Sakura could be thrown into an unexpected adventure, maybe in a new and dangerous part of the Naruto world. They would have to rely on each other's skills, with Kiba's tracking abilities and Sakura's medical ninjutsu and combat skills, to get through the challenges. This type of fanfiction often has a lot of action and suspense.
One common theme is friendship. They are all from the same village, so stories often show them building stronger bonds. For example, they might support each other during tough missions.
Well, they might face a lot of challenges. Since they are both ninjas, their active lifestyles could be a problem during pregnancy. They would have to be careful not to overexert themselves. Also, there could be rumors and gossip in the village about their relationship and the pregnancy.
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.
In some fanfiction scenarios, the father could be a character who was under a spell or some sort of mind - control when the encounter with Kiba happened. This would add an interesting twist to the story as Kiba has to deal with not only the pregnancy but also the mystery behind the father's identity and the circumstances of their encounter.
One possible plot could be about the challenges Kiba faces during the pregnancy. For example, she might struggle with how to continue her normal life while dealing with the physical changes. Maybe she has to hide it at first from certain people in her life.
You can try fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a large collection of fanfictions about various characters, including Kiba and Sakura.