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.
One possible fanfiction could be about Sasuke finding a baby during his travels. The baby, having an unexplained connection to Itachi, starts to influence Sasuke's view of his brother. Sasuke might see the innocence in the baby and be reminded of the good in Itachi that he once overlooked.
A common theme is protection. Itachi is often depicted as protecting baby Sasuke from various threats. Another theme is brotherly love. It shows their bond even when Sasuke is just a baby. Growth is also a theme, as we can see how Sasuke might grow up under Itachi's influence in the fanfiction.
One great fanfiction could be 'The Bond Beyond Blood'. It beautifully portrays Itachi's complex feelings towards baby Sasuke. It shows how Itachi, even with his difficult mission, still has an unbreakable connection to his little brother. Another is 'Sasuke's Unseen Guardian'. In this, Itachi secretly watches over baby Sasuke, protecting him from the shadows. And 'Itachi's Legacy for Sasuke' is also a good one, which focuses on how Itachi's early actions are setting the stage for Sasuke's future growth.
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 'itachi and baby sasuke fanfiction' could be about Itachi protecting baby Sasuke from unseen threats in the Uchiha compound. It might show Itachi's early love and care for his little brother.
One great fanfiction could be 'The Brothers' Bond'. It delves deep into the relationship between Itachi and baby Sasuke, showing Itachi's protective and loving side towards his little brother. The story is filled with heart - warming moments that really bring out the adorableness of the two characters.
In these fanfictions, a really sweet scenario could be that baby Sasuke is sick. Itachi takes care of him day and night, making him soup and staying by his bedside. Sasuke, in his feverish state, mumbles about how much he loves his big brother. Itachi, touched, promises to always protect him. This shows the deep, caring relationship between them that fanfiction often explores.
Another way is to join Naruto - related fan forums. There, you can ask other fans if they know of any good 'itachi and baby sasuke fanfiction'. They might be able to recommend some great stories or even direct you to specific authors who write in this genre.
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.