A plot twist could be that Sarada discovers she has a hidden power that neither Sasuke nor Sakura are aware of. It could be related to a long - lost Uchiha ability that skipped generations.
Another interesting plot twist would be if an old enemy from Sasuke's past resurfaces and targets Sarada, thinking she is the key to some long - forgotten power. This would force Sasuke and Sakura to work together in new ways to protect their daughter. They might have to call on some old allies they haven't seen in years. It would also put Sarada in a position where she has to quickly grow and learn to defend herself, maybe even unlocking new abilities in the process.
One plot idea could be Sarada trying to learn more about her father Sasuke's past adventures. She could ask Sakura for stories, and together they could go on a small journey to a place important to Sasuke's past. This would strengthen their family bond.
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.
There could be a plot where Sasuke and Sarada team up with other ninja to protect the village from an outside threat. Along the way, Sasuke teaches Sarada new combat strategies and they also share some emotional moments. Or perhaps a story where Sarada discovers a hidden power within herself, and Sasuke helps her understand and control it, which would be an engaging family - friendly plot for a fanfiction.
A great plot twist could be that Sasuke suddenly loses his sharingan and has to rely on his other skills and the help of the others. Naruto might have to train Sasuke all over again, and Hinata and Sakura could be involved in finding a way to restore Sasuke's sharingan. It would change the dynamics of their relationships and how they interact with each other.
Imagine a fanfiction where Sakura, instead of being in love with Sasuke, has feelings for Naruto all along. This would completely change the love triangle aspect and lead to a lot of interesting interactions between the three main characters. It could also cause Sasuke to re - evaluate his relationship with his teammates.
One interesting plot could be a story where Sarada discovers a hidden lemon grove that has some sort of special chakra. Sasuke and Sakura then join her to explore its secrets. Maybe the lemons have the power to heal or enhance their ninja abilities in unique ways.
One idea could be exploring how Sasuke and Sakura adjust to the impending parenthood while also dealing with their ninja duties. Maybe Sasuke is away on a mission and Sakura has to handle the pregnancy alone for a while, which makes her stronger and more independent.
A really unexpected plot twist could be that the kidnappers are actually the good guys in a convoluted way. Maybe they know of a prophecy that Sasuke and Sakura are fated to bring destruction, so they are trying to stop it. Another idea is that during the kidnapping, Sasuke and Sakura end up in a different dimension where they have to rely on each other in completely new ways. Plus, the motives of the kidnappers could be related to a secret that Sakura has been hiding about her family all along.
Perhaps the fanfiction would be about Sarada's discovery of her father's past and his reasons for leaving. This could lead to her going on a quest to find him and make him face his responsibilities.
One interesting plot twist could be that when they time travel, they end up in a world where the Uchiha clan was never massacred. Sasuke would have to face a completely different reality where his family is alive, but he also has to figure out how this new world affects the future. Another could be that they travel to a time when a great enemy from the past is still alive and they have to team up with their ancestors to defeat it.