A storyline could involve a time - travel element. Naruto, Sasuke, and Sakura are sent back in time and find themselves in a situation where they have to get married to change the future. They start off as reluctant partners but as they spend more time together in the past, they develop real feelings for each other. They also have to hide their relationship from their past selves and other characters while trying to figure out how to change the future.
Maybe there's a prophecy in the fanfiction that states only a union between Naruto, Sasuke, and Sakura can bring true peace to the ninja world. They initially reject the idea but as they see the chaos and destruction around them, they decide to give it a try. Their relationship is full of ups and downs as they try to balance their individual goals and dreams with their new relationship. There could be elements of self - discovery, love triangles (even within their own relationship), and the struggle to keep their relationship a secret from their enemies.
In this fanfiction, it could be that Sasuke returns to the village and he and Sakura start to build a life together. Their friends are happy for them, and then Sakura becomes pregnant. The story might explore how the news affects their friends and family, and also how Sasuke and Sakura grow as a couple during this time.
In some fanfictions, Sasuke might be in a situation where he has to choose between his goals and Sakura. His choice could end up hurting her. For instance, he decides to go on a very dangerous mission alone, knowing that Sakura is deeply in love with him and would be worried sick. His disregard for her feelings in this case is a form of emotional hurt. Also, there could be a scenario where Sasuke is forced to fight against Sakura in a misunderstanding, and his superior skills end up causing her serious injuries.
In such a fanfiction, one possible storyline could be that Sakura is under some dark magic or mind control which makes her turn against Naruto. Another could be a huge misunderstanding where she believes Naruto has done something unforgivable to her or their friends.
A different story could be them traveling the world together. They visit different villages and learn about new cultures and techniques. Along the way, they meet old friends and foes. This journey would strengthen their bond as they rely on each other for support and protection in unfamiliar places.
Perhaps there is a situation where Sakura is trying to protect Naruto from a dangerous attack, but due to some unforeseen circumstances, like a misdirected healing jutsu turning into a harmful one, she ends up killing him. It could then lead to a story of guilt, revenge, and the search for a way to bring Naruto back.
Well, in some fanfictions, Sasuke and Sakura's married life might be full of small, sweet moments. For example, Sasuke might bring back a flower he found on his travels for Sakura. They would have family dinners where they talk about their day. And when it comes to raising their children, they would both be very involved. Sasuke would teach them self - defense and discipline, while Sakura would teach them about kindness and the importance of helping others.
One possible challenge could be jealousy. Sakura and Hinata might feel jealous of each other's relationship with Naruto. Sakura is strong - willed and Hinata is very shy yet deeply emotional. Their different personalities could lead to conflicts over Naruto's attention. For example, if Naruto spends more time training with Sakura, Hinata might feel left out.
One possible reason could be jealousy. Maybe in the fanfiction, Naruto feels overshadowed by Sasuke in Sakura's eyes, which leads to his hatred. Another reason might be that he perceives their relationship as a threat to his own bonds with them. For example, he could think that Sasuke and Sakura's closeness excludes him in some way.
One possible reason could be a sudden and extreme corruption of Naruto's character. Maybe he is influenced by some dark and powerful force that makes him turn against his friends. Another reason might be a misinterpretation of a prophecy or some kind of mind - control situation.
One possible reason could be extreme jealousy. Sakura might be so blindly in love with Sasuke that she sees Naruto as a threat to Sasuke's attention or her relationship with Sasuke. Maybe she thinks Naruto is getting in the way of Sasuke's return to the village or her attempts to win Sasuke back.