One possible plot could be that Naruto and Sakura face challenges in raising their child. Maybe their child has a special power that attracts the wrong kind of attention from villains in the ninja world. They have to teach their child how to control this power while also protecting their family from threats.
Another plot could be that their family is involved in a mystery. There could be a prophecy related to their family that they need to figure out. Along the way, they discover secrets about their own families' pasts that help them understand the prophecy better and ultimately save the ninja world from a new threat.
One possible plot could be Naruto and Sakura getting married and having a family. Their child might inherit Naruto's determination and Sakura's intelligence. They could face challenges like protecting the village while also raising their family.
One possible plot could be that Naruto, Sasuke and Sakura end up in a situation where they have to form a secret family for a mission. Maybe they have to infiltrate an enemy organization that only allows families to enter. So they pretend to be a family, with Naruto and Sakura as the parents and Sasuke as their adopted son. Along the way, they start to develop real family - like bonds, learning about each other's strengths and weaknesses, and protecting one another.
In a 'naruto and sakura family fanfic', it could be that they start a family later in life. After achieving great things in the ninja world, they decide to settle down. Their family life could be filled with visits from their old friends like Kakashi and Sasuke. There could be family dinners where they all share stories of their past adventures, and the fanfic could explore how their friends interact with their new family dynamic.
One possible plot could be about them adjusting to family life. Naruto and Sasuke might have to learn how to be good fathers, while Sakura adapts to being a mother. There could be challenges like dealing with the expectations of the village. Another aspect could be the family facing external threats together and growing stronger as a unit.
One possible plot could be Sasuke finally fully integrating back into the village after his long travels. Sakura and he have a daughter. The story could focus on Sasuke trying to be a good father, like teaching his daughter some basic ninja skills. He also has to learn to be more open with his emotions, which Sakura helps him with.
It could be a rogue ninja who is jealous of Naruto and Sakura's happy family. This ninja might have some grudge against Naruto from the past, and now that Naruto has a family, he wants to disrupt their peace.
Maybe they start a family and Naruto becomes a great Hokage while Sakura takes care of their home. They face daily challenges together like any normal couple.
Maybe Naruto showed up late to a team meeting again. Sakura, who is always punctual, pouts at him as a sign of her disapproval. In the fanfiction, this could lead to a series of events where Naruto tries to make it up to her and in the process, they strengthen their friendship or even develop deeper feelings for each other.
One possible plot could be that Naruto decides to sing to Sakura to confess his love. He might choose a beautiful, secluded spot like the top of Hokage Rock. He sings a song that he has written himself, pouring all his unspoken feelings into the lyrics. Sakura is initially shocked but then starts to really listen and understand Naruto's deep emotions for her.
Maybe Naruto trains Sakura in combat. He could teach her some of his unorthodox fighting moves. Since Naruto has faced so many different opponents, he has a wide range of combat experience. He might show Sakura how to better anticipate an opponent's moves and counter them effectively. Sakura, in turn, could use her intelligence to analyze and improve on the techniques Naruto teaches her.