In many fanfictions, Sasuke starts as a character full of anger and a thirst for revenge. But in the context of a relationship with Itachi, he begins to soften. He starts to see Itachi in a different light, beyond just the person who killed their clan. Itachi, on the other hand, is often portrayed as a complex figure with many secrets. In these fanfictions, his love for Sasuke makes him more vulnerable and human. For example, in some stories, he reveals his true motives to Sasuke, which changes their dynamic.
Sasuke would likely become more protective. Usually Sasuke is very focused on revenge and his own power, but when faced with baby Itachi, he would feel the need to shield him from all harm. His cold exterior might soften a bit as he looks at the innocence of baby Itachi.
In fanfiction, Sasuke and Itachi's brotherly love is often depicted in very complex ways. Some stories focus on Sasuke's journey to understand Itachi after his death. He discovers the truth behind Itachi's actions, which were all to protect him and the village. This realization deepens his love and respect for his brother.
In Naruto, Sasuke's hand was broken by Orochimaru's forbidden technique,"Slag Transformation." The slugification was a powerful forbidden technique that could separate a person's soul from their body so that they could not die. When Sasuke was fighting Orochimaru, he was bound by the slug-form and his hands were cut off. However, Sasuke's hand did not appear in the Horito Legend because there was no direct connection between Horito Legend and Naruto Naruto. The storyline might be different.
Sasuke might develop more patience. Since Itachi is younger in this fanfiction, Sasuke has to be more understanding. He can't be as impulsive as he usually is. For example, he might have to learn to soothe Itachi when he's scared or upset, which helps Sasuke grow into a more empathetic person.
A simple version could be that the baby is left in Sasuke's care. As Sasuke takes care of the baby, he starts to think about family values. This makes him re - evaluate his relationship with Itachi, and he starts to see Itachi as someone worthy of admiration, just like a fan would. So both Sasuke and the baby, in a sense, 'turn into' Itachi fans.
One great aspect of their brotherly love in fanfiction is the complex emotions. Itachi's sacrifice for Sasuke, which was misinterpreted for a long time. Fanfictions often explore Sasuke's journey to truly understand Itachi's actions. They might show moments of Sasuke's inner turmoil as he realizes the depth of his brother's love.
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.😘
One possible scenario in this fanfiction could be that Sasuke's Susanoo hand captures Sakura in a moment of intense battle. Maybe it's not an act of aggression but rather an attempt to protect her from an unseen enemy. The Susanoo's power is so great that when it reaches out to grab Sakura, it creates a sense of both danger and safety at the same time. She might initially be startled but then realizes Sasuke's intention.