Sasuke would likely be initially shocked. He's a man who has been through a lot and is used to a life of solitude and danger. But then, a sense of protectiveness would kick in. He'd become more vigilant about the safety of Sakura and their unborn child. He might also start to think about how to be a better father than his own was, in some ways, trying to break the cycle of his family's past.
Sarada might be initially shocked and sad. She loves both her parents, and the divorce would be a huge blow to her. She could become withdrawn for a while, not wanting to talk to her friends about it.
Itachi would probably be very calm and composed. He might see Sarada as a symbol of the new generation of ninjas in the village. He could be gentle with her, perhaps sensing her potential and her desire to grow as a ninja.
In a Sarada meets past Sasuke fanfiction, it could be that Sarada has to keep her identity a secret at first. She might be on a mission in the past for some reason. As she observes past Sasuke, she could notice his skills and the way he interacts with others, like Naruto. This would give her a chance to understand the bond between her father and Naruto from a whole new perspective, which could be really interesting for the readers.
One great Sasuke, Sakura, Sarada fanfic is 'A Family's Bond'. It beautifully portrays the family dynamics between them. The story shows Sasuke's growth as a father, Sakura's strength as a mother, and Sarada's journey to understand her family better.
One idea could be a story where Sasuke takes Sarada on a special training mission, much like how his father might have trained him. Sakura could be worried at first but then see how Sarada grows from the experience.
In the fanfiction, the interaction between Sarada and Sasuke's family could be filled with emotions. Maybe Sasuke's family has high expectations of Sarada, given her relation to Sasuke. This could create some tension at first, but as they get to know her better, they start to accept and love her.
Another plotline could be that a new threat emerges in the ninja world that specifically targets the Uchiha clan. Sasuke, Sakura and Sarada have to work together to protect their family and the village. This would not only show their family bond but also their loyalty to their home. There could be intense battles and emotional moments as they face this new danger.
One idea could be a story where Sarada discovers a hidden jutsu that her father Sasuke once used. Sakura helps her understand the medical implications of using such a jutsu. They train together and bond over it, strengthening their family ties.