Sakura would be scared. She's in a dangerous situation with a powerful enemy. But she's also a strong - willed ninja. So she would be looking for ways to escape or at least hold her own until help arrives.
One possible plot could be that they discover their relation later in life. Sakura, who has been with the Leaf Village, and Sasori, a former Akatsuki member, could be shocked by this revelation. It might lead to Sakura trying to redeem Sasori or at least understand his actions better.
A plot could revolve around a mysterious illness that is affecting the village. Sasori, with his knowledge of poisons and mechanisms, and Sakura, with her medical expertise, are forced to collaborate. At first, there is a lot of tension between them due to their different backgrounds. However, as they dig deeper into the cause of the illness, they find that it is related to an ancient jutsu that was misused. Along the way, they start to respect each other's abilities and develop a bond that goes beyond their initial animosity.
I'm not entirely sure if there are a large number of them, but it's not uncommon for fanfic writers to come up with these sorts of unexpected character connections. In the Naruto universe, Sakura and Sasori are from different groups, but in a fanfic, the idea of them being siblings can lead to all kinds of interesting plot developments, like how it might change their interactions with other characters or their own personal growth within the story.
I think 'sasori x sakura fanfic' often explores an interesting relationship. Sasori is a complex character from Naruto, and Sakura is a strong - willed female character. In these fanfics, they might be put in various scenarios. For example, some fanfics could explore how Sakura's medical ninjutsu might interact with Sasori's puppet - related abilities. It can be a very creative exploration of the Naruto universe.
Well, one possibility could be that it's a dark fanfic where an enemy of Sakura kidnaps her to get to Sasuke. Maybe they want to use her as bait to lure Sasuke into a trap. Since Sasusaku is a popular pairing, the kidnapper might think that Sasuke would do anything to save Sakura.
One possible motive could be Sasori's desire to create the perfect puppet. Sakura, being a strong kunoichi, might have physical and chakra attributes that Sasori finds appealing for his puppet - making. He may see her as a unique specimen to add to his collection of puppets.
Well, it could start with Sakura initially being curious about Sasori's unique puppet techniques during a mission. Maybe she stumbles upon some old records of his work and is intrigued by the artistry and power behind it. As she delves deeper, she starts to respect his skills more and more, eventually becoming a sort of fan. She might even try to incorporate some of his strategic thinking into her own battles.
Well, in a fanfic like this, the plot could revolve around Sasori's obsession leading to him creating puppets in Sakura's likeness. He might be so fixated on her that he tries to replicate her in his own art form. Or perhaps he tries to manipulate situations in the ninja world to get Sakura to come to him willingly. He could send out false threats or create chaos just to draw her attention. And as Sakura becomes aware of his obsession, she has to figure out how to deal with it, whether it's through fighting or trying to understand the root of his feelings.
The main plot could center around their journey to break free from their parents. Sakura and Sasori might start to discover their own strengths and powers in the face of the abuse. For example, Sakura could be developing her medical ninjutsu skills not just for combat but also to heal the emotional wounds they both have. Sasori, on the other hand, may be using his puppet - making skills to create something that can protect them from their parents' wrath.
One common theme could be the exploration of an unlikely relationship. Since Sakura and Sasori are from different sides in the Naruto universe, their relationship in fanfics often delves into how they overcome those differences. Another theme might be the power dynamic between them, with Sasori being a powerful puppet master and Sakura having her own strength as a medic - ninja.