He might meet the future versions of Naruto and Sakura. Their relationship with him could be very different in the future, perhaps they are now leaders of the village and Sasuke has to adjust to their new status.
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.
Jiraiya's comfort gives Naruto the confidence to face his fears. For example, if Naruto was crying because he was afraid of a powerful enemy, Jiraiya's words of wisdom and support would make him more determined to train harder and find a way to defeat that enemy in the future.
Sasuke traveling to the future in the fanfiction would be full of possibilities. He could find that the traditional ninja clans have evolved into something completely different. For example, the Uchiha clan may have developed new and unique powers that are a combination of their Sharingan heritage and future technology. He may also meet versions of himself from different timelines, which would create a very complex and mind - boggling situation as he tries to figure out his place in this new future.
Well, Itachi might be shocked to see how much Sasuke has changed in the future. Maybe Sasuke has developed new powers or a different outlook on life. Itachi could also feel a sense of pride or regret depending on how Sasuke has turned out.
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.
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.
Jiraiya might comfort Naruto by sharing his own experiences. He could tell Naruto about the times he faced difficulties and how he overcame them. For example, he might talk about his training with the toads and how he grew stronger through perseverance.
If we consider emotional dominance, Itachi might be more dominant at first as he has always been in control of his emotions and has a lot of secrets that could shock Sasuke. But if future Sasuke has overcome his emotional turmoil and has a clear goal in mind, he could turn the tables. In a physical or power - based sense, it could go either way depending on how the author of the fanfiction has developed their respective powers and skills in the future scenario.
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.