In the fanfiction, their relationship would likely be more trusting right from the start. In the original, they had a lot of rivalry and mistrust. As adopted brothers, they would have a deeper emotional connection, so they would be more likely to confide in each other.
Well, in the fanfiction, they would probably have a more domestic side to their relationship. They could be seen sharing meals together, having conversations about normal things like what they want to do when they grow up, in addition to their ninja duties. This domesticity would add a new layer to their relationship that was absent in the original series, where their interactions were mostly centered around their rivalry and the overarching plot of the ninja world.
Their relationship would likely become more complex. They might start to protect each other more fiercely. For example, Sasuke might not leave the village in the first place because he now has a closer family tie to Naruto. Naruto would also be more insistent on getting Sasuke to stay and see him as an important part of his family.
In the original story, Naruto and Sasuke have a complex but deep - rooted friendship. In this fanfiction, the hatred completely flips their relationship. They would no longer be friends but rather rivals or even enemies. There would be no more of Naruto's attempts to bring Sasuke back to the village.
Well, with Sakura, for example. If Naruto and Sasuke were brothers, Sasuke might be less cold towards her because he would have Naruto's influence. Naruto, on the other hand, might be more protective of Sasuke in his relationship with Sakura, making sure she doesn't get hurt by Sasuke's sometimes aloof nature.
The fanfiction changes the dynamic by making Naruto less empathetic towards Sasuke's past traumas. In the original, Naruto could understand Sasuke's pain to some extent which led to his forgiveness. Here, Naruto is more focused on Sasuke's wrongdoings, like his attacks on the village and his actions that endangered their friends. This makes their relationship more of a stand - off, like two opposing forces.
It would likely become more cooperative. They'd have to communicate more often to take care of the pregnancy - related matters.
If Sasuke kidnapped Naruto, it could initially seem like a huge betrayal. However, Naruto is known for his ability to forgive. He might see this as Sasuke still caring about him in his own, twisted way. This could make their relationship more complex, with Naruto constantly trying to reach out to Sasuke and Sasuke struggling with his own emotions and reasons for the kidnapping.
The child would add a new dimension to their relationship. Naruto and Hinata would have to communicate more about the child's needs. This would lead to a deeper understanding of each other. They might also have different opinions on how to raise the child, but through resolving those differences, their relationship would grow. Hinata might become more assertive in expressing her views on parenting, and Naruto would learn to listen more, which is great for their relationship.
Well, it would be quite different. If Sasuke was the village - bound one and Naruto the outcast, Sasuke would probably be more frustrated with Naruto. He'd see Naruto's actions as irresponsible and dangerous. Naruto might view Sasuke as naive for still believing in the village.
If Sasuke's sister was in the picture, Naruto and Sasuke's relationship might soften more quickly. Naruto would see another side of Sasuke through his sister. He might also feel more of a connection to Sasuke's family. Sasuke, on the other hand, would see Naruto's genuine care for his sister, which could make him trust Naruto more.
The relationship would be very different. Instead of Naruto chasing after Sasuke to bring him back, it might be Sasuke trying to reach out to Naruto. Sasuke would be the more empathetic one, constantly trying to break through Naruto's cold exterior.