Some Uchiha might be suspicious of her at first. After all, she's an outsider. But others may be curious about her skills, especially if they know she's a strong ninja from her own village. They could either welcome her with open arms if they see potential benefits from her visit, or keep her at a distance if they fear she might bring trouble.
She might have a lot of adventures. For example, she could encounter powerful Uchiha ninjas and learn their unique jutsu. Maybe she'll get involved in some sort of mystery within the kingdom, like a secret about the Uchiha's power source. Also, she could form unexpected friendships or rivalries with the Uchiha clansmen.
The Uchiha might initially be filled with anger. Their trust in Naruto, if it was there before, would be completely shattered. They could start to plot revenge against Naruto, believing that he has wronged them. This could lead to a lot of tense moments in the fanfiction as the Uchiha gather their strength and resources.
It could be about Sakura having a strong admiration or being a fan within the Uchiha context in the fan - made story. Maybe she is a big fan of an Uchiha character like Sasuke, and the fanfiction explores her feelings, actions related to that admiration.
Their relationship could start with mutual respect. Shisui might respect Sakura's determination and her growth as a ninja. Sakura, on the other hand, would be in awe of Shisui's Sharingan abilities. As they go on missions together, they start to trust each other more and more.
Often, in fanfiction, Sasuke's romance with Sakura develops as they face challenges together, and he realizes her importance and starts to express his love more openly and passionately.
Sakura's character would likely become more confident. Being an Uchiha gives her access to powerful abilities and a certain status within the Naruto world. This new - found power could boost her self - esteem which was sometimes lacking in her original self. She would also become more in - tune with the darker aspects of the Naruto universe as the Uchiha have a tragic history.
I'm not sure specifically what that particular 'sakura oldest uchiha fanfiction' is about as there could be many out there. It might be a fan - created story that involves Sakura from the Naruto series and an Uchiha character, perhaps exploring their relationship, or it could be about Sakura's connection to the history of the Uchiha clan in a fictional scenario.
There may be a vast amount of fanfiction out there, but this particular description involves inappropriate and vulgar content. Most fanfiction platforms have rules against such content. So, it's improbable that there exists a fanfiction with this description. Fanfiction usually aims to explore characters' relationships, adventures, and development in a more appropriate and respectful way.
One common theme could be Sakura trying to fit into the Uchiha clan's culture. Another might be her developing relationships with Uchiha characters in a new way, like a deeper friendship or a romantic relationship with an Uchiha.
One great Sasusaku Sakura Uchiha fanfiction is 'A New Beginning'. It focuses on Sakura's growth after the war and her relationship with Sasuke. The story beautifully portrays her as a strong and independent character, and the interactions between her and Sasuke are very heart - warming.