In some fanfictions, Sasuke could be under the influence of some dark power or curse. This power might compel him to kidnap Sakura. For example, a dark entity might want to use Sakura's abilities or her connection to Sasuke for its own evil purposes, and Sasuke, being unable to fully control himself, follows its commands.
Perhaps Sakura kidnaps Sasuke because she suspects he is in danger from some unseen enemy. She believes that by taking him away from the normal routine, she can protect him. She might have some inside information about a threat to Sasuke's life. In the process, Sasuke at first is angry with her for this drastic measure, but then realizes her good intentions as she reveals what she knows.
One possibility is that Naruto and the others would immediately start a search and rescue mission. They would follow Sasuke's tracks and try to figure out his motives. Sakura, on the other hand, might try to reason with Sasuke during the kidnapping. She could remind him of their past friendship and the bonds they once shared.
One possible reason could be Sasuke's pursuit of power. In many fanfictions, his thirst for greater strength might lead him to leave Sakura behind as he embarks on a solo journey to train in more dangerous and secluded places. He may feel that his goals are too dangerous for her to be involved with.
One possible reason could be a lack of communication. If Sasuke is always away on his missions and doesn't share his thoughts and feelings with Sakura, it can create a rift. Another reason might be differences in their long - term goals. For example, Sakura may want a more stable family life, while Sasuke is still too focused on his pursuit of power or justice in the shinobi world.
One possible plot could be that Sasuke has some sort of misunderstanding. Maybe he believes Sakura has some information about a threat to Konoha that she's not sharing, so he kidnaps her to force her to talk. Then Sakura tries to convince him that he's wrong while also trying to understand why Sasuke has become so extreme.
One possible reason could be that Sasuke is frustrated with Sakura constantly trying to get close to him when he's focused on his revenge. He might yell at her to keep her away and not interfere with his plans.
One possible reason could be Sasuke's continuous absence. He is often away on missions, leaving Sakura feeling lonely and neglected. In fanfiction, this could be exaggerated to a point where she can't take it anymore.
Sasuke could also be motivated by power. He might believe that Sakura has some sort of knowledge or power that he needs. By kidnapping her, he can force her to give it to him or help him obtain it. This could be related to her medical skills or some hidden power within her that Sasuke has discovered.
Well, it could start with Sasuke getting some false information that Sakura is being targeted by a powerful and evil organization. He decides to take matters into his own hands and kidnaps her to a secret location. Along the way, Sakura tries to escape, but as they encounter some of the real threats that Sasuke was worried about, she starts to understand his actions. They then team up to fight off the bad guys and in the process, their bond is reforged and they gain a new level of respect for each other.
One possible reason could be Sasuke's continued obsession with revenge. His single - minded pursuit of power and vengeance might make Sakura feel neglected and unloved in the relationship. For example, he often goes off on long and dangerous missions alone, leaving Sakura behind worried sick. Another reason could be a fundamental difference in their values. Sakura values life and healing, while Sasuke has been more focused on destruction in his quest for revenge.