It could be due to Sasuke's past actions and Sakura's inability to fully trust him again. Sasuke has done a lot of things that hurt the village and people around him. Sakura might be worried that he will do something similar again, and when she tries to confront him about it, a fight breaks out. Maybe she wants him to be more accountable for his past, but Sasuke doesn't want to be tied down by it.
One possible reason could be a difference in their views regarding the future of the village. Sasuke might have some extreme ideas that Sakura, as a more village - centered person, can't accept. For example, Sasuke may think about taking some radical actions to change the shinobi world order which Sakura believes would put the village at risk.
One possible reason could be a misunderstanding. Maybe Percy made a decision without consulting Annabeth, thinking it was for the best, but she felt left out. For example, if he agreed to a dangerous mission without her input. Another reason might be jealousy. If Percy got a lot of attention from someone else, Annabeth could feel insecure.
Well, one reason could be Sasuke's continued obsession with his revenge. He might be so focused on it that he ignores Sakura's feelings and concerns, which could lead to a fight. For example, if Sakura tries to persuade him to let go of his revenge and he refuses, it could spark an argument.
One possible reason could be that Sasuke is often brooding and focused on his revenge. Sakura's more open and sometimes pushy affection might seem annoying to him as he has no room for such distractions in his dark mindset.
One possible reason could be that Sasuke is trying to protect Sakura in his own twisted way. He might think that by making her his wife, he can keep her safe from the dangerous world they live in. Another reason could be related to his family. He might see marriage to Sakura as a way to rebuild his family name or something similar. However, his method of forcing her is completely wrong.
One possible reason could be a misunderstanding. Maybe Sasuke has been misled to think Sakura is a threat to him or his goals at that moment. In the Naruto universe, Sasuke has often been on a solitary path filled with suspicion. He might tie her up to keep her from interfering with something he's about to do. Another aspect could be related to some kind of test. He may want to see how Sakura will react in such a difficult situation to gauge her growth as a ninja. It could also be a part of a plan to protect her from something more dangerous, by restraining her movement in a way that he believes is the best for her safety, using the snakes as a means to immobilize her as he is known for his snake - like jutsu.
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.
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.
It could also be related to Sasuke's emotional detachment. He often keeps his feelings bottled up and distances himself from others. Sakura, being in love with him, might yell at him to try and break through that cold exterior. She might be tired of his silent treatment and lack of communication, so she lashes out in the fanfiction, hoping to get a real reaction from him.
Perhaps it's a training exercise that gets out of hand. In the world of Naruto, intense training often mimics real battles. If they were sparring and emotions ran high, it could turn into a full - fledged fight. Also, Sakura might be trying to prove herself to Naruto, and Naruto, not understanding her intentions, might respond aggressively.