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.
If they were half - brothers, there would be a deeper sense of loyalty. Sasuke would probably be more open with Naruto about his feelings and his past traumas. Naruto, in turn, would be more understanding and patient with Sasuke. They could develop a stronger bond based on their shared bloodline, and this would show in their teamwork. Instead of just being rivals, they would be brothers looking out for each other, and this could lead to new combined jutsu and strategies in battle.
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.
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.
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.
It would likely become more cooperative. They'd have to communicate more often to take care of the pregnancy - related matters.
In a half - demon Naruto fanfiction, Sakura might also have to adapt to Naruto's new powers. This could create a new dynamic where Naruto is sometimes the one in need of her help and sometimes the one protecting her with his enhanced abilities. Their relationship would be more complex, with a mix of care, respect, and a new - found understanding of each other's roles in their shared journey.
His relationship with Sasuke would become more complex. Sasuke, who has always been proud of his Uchiha heritage and the Sharingan, might feel a mix of envy and pride that Naruto now has a part of what makes the Uchiha special. Naruto, on the other hand, would try to use the Sharingan to understand Sasuke better, perhaps seeing the world more from Sasuke's perspective.
Naruto would probably become more cautious in some ways. His usually brash and head - first attitude might be tempered as he has to consider Sasuke's feelings more. Sasuke, in turn, might become a bit more vulnerable. He's used to being alone and aloof, but in a marriage with Naruto, he'd have to let his guard down at least a little.
Their relationship could become more complex. They might have a deeper understanding of each other as they share this special heritage. There could be more respect between them as they realize they are both part of something bigger than themselves.
Their relationship with Sasuke would be very different. Naruto might not look up to Itachi as much as in the original story, and Itachi might not see Naruto as a potential threat to Sasuke's growth. Instead, they could both be like older brothers to Sasuke, guiding him in different ways.
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.