In such fanfiction, Sakura might be depicted as more alluring and perhaps more bold in her interactions with Madara. Madara could be shown as having a certain charm that draws Sakura to him.
Well, it could be through his powerful ninja techniques. Maybe he uses his Sharingan to paralyze Sakura, or perhaps he physically restrains her with his great strength. In fanfictions, there are many creative ways for such a scenario to play out.
Perhaps he sees her as a threat. Sakura is a skilled kunoichi, and Madara may want to prevent her from interfering in his plans. So he restrains her to keep her out of the way.
In a fanfiction, Madara might capture Sakura to gain leverage over Naruto. Since Sakura is one of Naruto's closest friends, Madara could think that by having her in his control, he can manipulate Naruto's actions. Sakura, being the strong - willed character she is, would surely try to find a way to escape and send a message to her friends.
In many fanfictions, the idea of Sakura being the reincarnation of Madara is used as a plot device. This can lead to some really interesting story developments. For example, it might change how Sakura interacts with other characters like Naruto and Sasuke. Her new 'reincarnation' status could give her access to Madara's powers or knowledge in some way. It also allows the author to play with themes of destiny, power, and self - discovery in a different way compared to the original Naruto story.
In some fanfictions, Sakura's reaction could be more complex. She might be hurt not just physically but also emotionally. This could lead her to question her relationship with Sasuke and might cause her to make some big decisions, like whether to continue trying to reach out to him or to cut him off completely.
There could also be other supporting characters. For instance, Naruto might make an appearance. Since he's Sakura's friend and also has a connection to Itachi through Sasuke. Naruto could come in to try and stop Itachi from attacking Sakura, adding another layer of conflict and drama to the story. Or Kakashi could be there. He's their teacher and has a good understanding of both Itachi and Sakura's capabilities, so his presence could change the course of the story as well.
One common theme is redemption. Madara, having made many wrong choices in his life, often finds redemption through his interactions with Sakura. For example, in some fics, Sakura's kind heart makes Madara re - evaluate his actions.
There could be implications for the overall plot of the fanfiction. It could lead to a different kind of conflict, perhaps with other characters who have a vendetta against Madara or the Uchiha clan. Sakura's new identity as the reincarnation of Madara could also attract the attention of powerful and dangerous entities, forcing her to face new challenges and make difficult choices that she wouldn't have had to in the original Naruto story.