The relationship change would be significant. Future Sakura meeting past Sasuke means she has the opportunity to correct some of the mistakes in their relationship's past. She could be more assertive in expressing her feelings for him, and Sasuke would be more receptive. Maybe she could help him deal with his inner demons earlier, which would make their relationship more stable. Also, they would have a unique shared experience of this time - traveling encounter. This would set their relationship apart from what it was in the original Naruto storyline, and it could lead to a more harmonious and loving relationship.
Their relationship would likely become more complex. Since future Sakura has more knowledge about Sasuke, she would approach him differently. She might be more confident and less shy around him compared to her younger self. Sasuke, on the other hand, would be intrigued by this strange girl who seems to know so much about him. He might start to trust her more quickly than he did in the original story, which could lead to a deeper emotional connection between them.
Well, in the fanfiction, Sakura from the future meeting past Sasuke could completely transform their relationship. For one, Sakura might be able to prevent Sasuke from leaving the village in the first place. If she does that, they would have more time together, and Sasuke would see Sakura in a new light. He would realize that she is not just the weak girl he thought she was. And Sakura would be able to show Sasuke her true strength and dedication to him. This would create a stronger bond between them, and they might even start to develop romantic feelings for each other much earlier.
Sasuke might be initially surprised. He is used to the Sakura from his past, so seeing a different, more mature future Sakura could catch him off guard.
Their relationship would likely become more intense. As vampires, their emotions might be heightened. They could become more possessive of each other. For example, Sasuke might be more protective of Sakura, seeing her as his mate in the vampire sense.
One possible plot could be that future Sakura, with her advanced medical skills and battle experience, goes back in time and meets a younger Sasuke. She might try to prevent some of the tragedies that Sasuke later endures. For example, she could warn him about Orochimaru's true intentions, which would change the course of Sasuke's journey. This would also lead to different interactions between Sakura and Sasuke compared to the original story. Their relationship might develop in a more positive way earlier on, as Sakura from the future has a deeper understanding of Sasuke's pain and the consequences of his actions.
Their relationship could become more strained. Sakura might be afraid of Sasuke after the bite, creating distance between them. Sasuke, on the other hand, could be filled with regret and try to avoid her, which would further complicate their relationship.
Their relationship would likely become more intimate and committed. With a baby on the way, Sasuke would feel a greater sense of responsibility towards Sakura. He might be more protective and stay closer to her.
The relationship often becomes more strained. Sasuke's punishment can make Sakura feel resentful at first. But over time, it can also lead to her becoming more independent as she tries to prove herself to him.
If they travel to the past, Naruto and Sasuke's relationship might change in several ways. They could start to see each other in a new light. For example, Naruto might see a more innocent Sasuke in the past and be even more determined to protect him. Sasuke could also see Naruto's growth from a different perspective and appreciate his friend more. Their bond could be less about revenge and more about mutual growth and protection as they navigate the past world together.
In this fanfiction, Sasuke might be shocked to see how much Sakura has changed in the future. Maybe she has become a more powerful ninja, or perhaps she has achieved great things in the medical field, which could make Sasuke view her in a whole new light.
Their relationship could become stronger. With a son, they have a new bond that ties them together even more. They might communicate more often and share their parenting experiences. They could also rely on each other more in terms of protecting their family.
Their relationship would become more intimate in a different way. Instead of just the bond of comrades or lovers, they'd now be parents - to - be. Sasuke would likely become more protective of Sakura.