Sure. Itachi's saving of Sasuke was a crucial moment in the manga. It was tied to his hidden motives and sacrifices for the greater good of the ninja world and Sasuke's future.
I think young Sasuke would have a very intense reaction. He was so consumed by his hatred for Itachi at that young age. A Sasuke vs Itachi fanfiction would be like a trigger for him. He would be eager to see how the fictional fight is portrayed. If Sasuke in the fanfiction is shown as strong, it might fuel his own ego and make him strive even harder to become powerful. However, if the fanfiction shows Itachi as superior, it could enrage him. He might feel that it undermines his own goal of defeating Itachi and he might even want to find the writer to correct their 'wrong' view.
A possible fanfic could focus on a parallel universe where Itachi and Sasuke are not bound by the same clan conflicts. In this universe, they could meet in a more peaceful setting, like a small village. Their relationship could develop gradually as they discover shared interests. For example, they might both be interested in learning about ancient ninja arts, and through this common ground, a yaoi - inspired relationship could start to form.
Fanfiction.net is also a good place to search. However, the tagging system might not be as detailed as AO3. But if you dig a bit and look through the Naruto section, especially in the Itachi and Sasuke character - centric stories, you may come across such a fanfiction. Some writers might be more subtle about it and not have the kiss as an obvious part of the title, so you'll need to read the summaries too.
He might feel anger. Since he was so set on revenge against Itachi, any portrayal that didn't match his view of himself as the victor could make him angry.
One common theme is the struggle between love and power. Since Itachi is a vampire, he often has to balance his newfound power with his love for Sasuke. Another theme is the idea of forbidden love, as their relationship might be seen as taboo in the context of vampire and human (or in this case, another Uchiha).
The theme of self - discovery could also work well. As they get closer in a yaoi relationship, both Itachi and Sasuke could discover new sides of themselves. Sasuke might find that he has a softer, more understanding side that he never knew existed, and Itachi could realize that he doesn't always have to carry the burden alone.
I recommend the novel," From Uchiha to Control the Wood Leaf," which tells the story of a Mitsuya who transmigrated to the Naruto World and became the uncle of Itachi and Sasuke, and the sworn brother of Uchiha Tomitake. Although he had a respectable status and was extremely powerful, he was short-sighted. He had few chakras and was not good at illusions and ninjutsu. He was a role model with his glasses on, but he was a demon king without his glasses. Among them, Itachi and Sasuke were both protagonists in the novel, which met the requirements of Itachi or Sasuke's transmigration novel. I hope you like my recommendation.đŸ˜˜
You can start by searching on popular fanfiction websites like FanFiction.net or Archive of Our Own. Use specific keywords like 'Itachi', 'baby Sasuke' and 'fanfiction'. Check the ratings and reviews of the stories. High - rated ones with positive reviews are more likely to be good.