Well, perhaps in the fanfiction, Naruto as Sasuke's brother could mean that Naruto has some latent Uchiha abilities. This could create a whole new arc where Naruto struggles to control these new powers while also dealing with his relationship with Sasuke. Maybe they have to fight against an enemy who is specifically targeting their brotherly bond, trying to turn them against each other.
One plot idea could be that Naruto and Sasuke grow up knowing they are brothers. They train together secretly, combining Naruto's Uzumaki stamina and Sasuke's Sharingan abilities. This leads to them creating unique jutsu. Another could be that their brotherhood is a secret from the village, and they have to protect this secret while still trying to save the village from threats.
In this fanfiction, it could be that their brotherly bond changes the entire Naruto storyline. Instead of their initial rivalry, they are a united front from the start. They might go on a journey together to discover more about their family's past. Naruto could use his influence as Sasuke's brother to prevent Sasuke from leaving the village in the first place, leading to a much more peaceful and different Konoha.
Well, a plot could revolve around Naruto and Sasuke growing up together more closely because of their family relation. Naruto could be more aware of Sasuke's family situation from the start. This might lead to Naruto trying to prevent the Uchiha massacre. He could use his influence as a cousin to bring Sasuke closer to the village earlier, changing the whole dynamic of the story. Maybe they even train together under new family - related training methods.
One plot idea could be that they discover their relation early on. Naruto, being his usual positive self, tries to get closer to Sasuke right away. Sasuke, on the other hand, is initially in denial but gradually warms up as they start to train together more often. They could team up against stronger enemies earlier in the story, using their combined skills and the new - found bond of being half - brothers to their advantage.
Perhaps in this fanfiction, they are the only ones who can stop an ancient evil that has been awakened. They are inseparable in the sense that they are constantly protecting each other. Naruto might use his Rasengan to create openings, Sasuke with his Sharingan to analyze the enemy's moves, and Sakura to heal any injuries they sustain immediately, making them an unbeatable trio.
One plot idea could be that Sasuke sees Naruto getting closer to Sakura during a mission. He becomes possessive and starts to interfere in their interactions, creating tension within the team. For example, he might try to take over tasks that Naruto and Sakura are doing together just to be near Sakura.
A possible plot could involve Sasuke and Female Naruto having to deal with family issues regarding their engagement. For Naruto, it could be about her father figure's reaction or lack of family traditions to follow. For Sasuke, it could be about his clan's expectations. They could also have a plot where they try to combine their different ninja styles in a joint training session as part of their preparation for a future together as a married couple.
One idea could be that they have to face the challenges of being pregnant in a world full of shinobi battles. Maybe they have to hide their pregnancies from enemies who might see it as a weakness. Another could be that they support each other through the physical and emotional changes, and their friendship grows even deeper during this time.
One plot idea could be that Gaara, as Naruto's protective brother, uses his sand powers to shield Naruto from various attacks during a major battle against a new and powerful enemy. For example, when the enemy launches a surprise attack on Naruto, Gaara quickly forms a sand barrier around him, saving his life. Another idea is that Gaara helps Naruto train in secret to master a new technique. He shares his own experiences with controlling power, which Naruto can relate to with his Nine - Tails chakra.
One plot idea could be that they discover their brotherhood early on and train together more closely. They might combine their unique abilities, like Naruto's Rasengan and Sasuke's Chidori, to create new and powerful jutsus. This could change the whole dynamic of the story, with them facing challenges as a united front instead of rivals.
Well, Sasuke as a girl could have a plot where she discovers a new form of chakra or ninja technique that is only accessible to female ninjas. This would make her a target for both good and bad forces. She would have to master this technique while also dealing with the fact that some of her male comrades are jealous or skeptical. And her story could also explore how her appearance as a girl affects her perception of herself and her place in the ninja world.
One plot idea could be that as a girl, Sasuke has to face different challenges in the ninja world. For example, she might struggle with the traditional male - dominated expectations in combat training. Another could be a love story where Sasuke, as a girl, has a different dynamic in her relationships with other characters like Naruto or Sakura. Maybe she becomes more of a confidante to Sakura, and her relationship with Naruto takes on a new romantic or platonic dimension.