A possible plot could involve a situation where Sasori has some sort of valuable information that the Leaf Village needs. Naruto, being the bold and unpredictable one, decides to impersonate Sasori to get close to the source of that information. He might have to use his shadow clones to create the illusion of Sasori's puppet - like abilities. And during this impersonation, he could learn more about Sasori's past and what made him the way he was, while also trying to achieve the mission goal without getting caught.
I'm not sure of a specific 'naruto impersonates sasori fanfic' off the top of my head. You could try searching on fanfic websites like Fanfiction.net or Archive of Our Own. They have a large collection of Naruto - related fanfictions and you might be able to find one there.
Maybe in the fanfic, Naruto is on a mission to retrieve some important information that Sasori has. When Naruto talks to Sasori, it turns into a battle of wits. Sasori tries to deceive Naruto with false information while Naruto uses his intuition and sharp mind to see through the lies. Along the way, they also discuss their different upbringings and how it shaped their current selves.
It could still be Orochimaru. Even though the focus is on Naruto and Sasori talking, Orochimaru might be pulling strings in the background. He could be using Sasori's connection to Naruto to further his own evil plans, like getting access to some powerful jutsu that Naruto might possess or know about.
In this fanfiction concept, the relationship between Sasori and Sakura would be turned upside down. Sasori, known for his cruelty, would now be in a position of a father. He might try to influence Sakura's growth in his own way. Maybe he'd teach her some of his puppet - making skills or his unique combat techniques. Sakura would be in a tough situation. She has her own values and goals, but now she has to factor in her connection to Sasori. She might be conflicted between her loyalty to her friends and her new - found family bond with Sasori.
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.
The impact would be huge. The Naruto plot is based on certain relationships and power dynamics. If Sasori is Sakura's father, it changes the whole backstory of Sakura. Her motivation, her family history, and her place in the ninja world would all be different. It could also change the relationship between Team 7 and the Akatsuki. For example, Naruto and Sasuke might have to re - evaluate their feelings towards Sakura if she has such a connection to an Akatsuki member.
The unique dynamic between Botton and Sasori. Their personalities are so different that when put together in a fanfic, it creates a lot of potential for interesting stories.
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.
The OC could be designed as a very empathetic person. Since Sasori has a lot of emotional baggage from his past, an empathetic OC can understand his feelings and help him heal. For example, she could listen to his stories without judgment and offer comfort.