Well, one possible plot could be that Sasuke has some sort of misunderstanding. Maybe he believes Naruto is in danger from an unseen enemy and kidnaps him to protect him. He takes Naruto to a secluded place, and at first Naruto is angry. But as they talk, they start to understand each other's motives better and their bond deepens.
It could be that Sasuke has been influenced by some dark force. He kidnaps Naruto not fully in control of his actions. Naruto tries to reach out to the real Sasuke inside. As they are in the situation, Naruto's positive energy starts to fight off the dark influence on Sasuke and they both have to face some internal and external challenges together.
Perhaps Sasuke kidnaps Naruto because he wants to force Naruto to train with him in a special way. He thinks that by taking Naruto away from the village and its distractions, they can both become stronger. Naruto initially resists but then realizes Sasuke's intentions are not entirely bad and they end up having an intense training session together.
Naruto would probably be really angry at first. He's a free - spirited person who doesn't like being forced into things. So he'd likely try to fight back right away, yelling at Sasuke about what he's doing.
One possible motive could be to force Naruto to understand his own power. Sasuke might think that by kidnapping Naruto, he can push Naruto to a situation where he has to tap into his full potential. Maybe Sasuke feels that Naruto has been relying too much on his friends and needs this shock to grow stronger on his own.
One possible plot could be that Sasuke has some misunderstanding. He might think Naruko is in danger from some hidden enemy in the village. So, he kidnaps her to protect her, but Naruko doesn't understand his intentions at first and struggles against him. Eventually, they start to communicate and Sasuke explains his reasons.
Perhaps Sasuke is being controlled by some dark force. He kidnaps the OC because the dark force wants to use the OC's special abilities. As the OC tries to reason with Sasuke, he gradually breaks free from the control and they end up teaming up against the real enemy.
Well, it could be that Sasuke has some ulterior motive like trying to get information from her. Maybe he believes Naruko has some knowledge about a threat to the village or to himself. He might be acting out of a sense of self - preservation or a misdirected attempt to protect others.
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.
Perhaps Sasuke kidnaps female Naruto because he wants to protect her from a greater threat in his own way. He may not trust the others to keep her safe. He takes her to a secluded place. Naruto initially resists but then realizes Sasuke's intentions are not entirely malicious. They then start to have a conversation about their past and how things have changed between them.
Well, perhaps the plot of the fanfiction where Sasuke kidnaps the reader could involve a misunderstanding. Sasuke might think the reader is working for his enemies when in fact they are not. As for the story development, it could lead to the reader gradually understanding Sasuke's past traumas and reasons for his actions, and in the end, they might even help him heal some of his emotional wounds. And there could be a lot of action scenes where the reader tries to escape but then realizes that Sasuke is not really a bad guy in this situation.
Naruto could use her shadow clone jutsu. She could create multiple clones while Sasuke is distracted and then make her escape. Since she has a large amount of chakra, she can afford to create a lot of clones to confuse Sasuke.
In this kind of Yaoi fanfiction scenario, one possible thing that could happen next is a lot of emotional turmoil. Sasuke might have kidnapped Naruto for reasons related to his own inner demons or some misconstrued idea of protecting him. Naruto, being kidnapped, would initially be angry and confused. He would try to reason with Sasuke, leading to some intense dialogues that could explore their complex relationship. There could also be a moment where Naruto starts to understand Sasuke's motives a bit more, which might lead to a change in their dynamic, perhaps even towards a more affectionate connection as is often the case in Yaoi stories.