There could be. Fanfiction often takes creative liberties with the original story. However, this particular concept might be a bit of a stretch considering their original relationship in the Naruto series. But in the world of fanfiction, it's possible for an author to build a whole new narrative around Naruto being Sakura's brother, exploring things like their shared family secrets or how they support each other in different ways.
Sure. Fanfiction writers love to play around with character relationships. If Naruto is Sakura's brother in a fanfiction, it might change the entire tone of the story. For example, Naruto's usual pursuit of Sakura in the original series would be completely different. Instead, he would have a more brotherly protective instinct towards her. And Sakura might also view Naruto in a new light, perhaps relying on him more as a family member. This new relationship could also impact how they both deal with the challenges in the ninja world, like fighting against common enemies or dealing with political issues within their village.
Chapter 138, "From now on, let's get to know each other again", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Is there such a good deal?
Chapter 180, "West District Police Station Steps In!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with In the end, everyone received gifts that were completely opposite to...
Chapter 388, "All the Rich People in Jing City Are in Jiang Li's Live Room", is the clearest early answer because it pushes All into a new phase or setting. The chapter turns that into something concrete by moving from what, what do you plan to do?" Gu Yu's false identity was never meant...
Chapter 441, "The Taoist also Chases Stars?", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. Early on, She had also only learned a little trick after reading many books.. By the end, I'm not on your team, why should I help you?" Yu Li: Alright, his....
Chapter 284, "You'll Never Get Rid of Me!", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. Early on, Bai Lu, also an actress, naturally saw through the insincere.... By the end, She viciously slapped her phone onto the desk..
Chapter 422, "The Watch Was a Gift from Him", is the clearest early answer because it turns Gift's situation into a concrete plot event. The chapter turns that into something concrete by moving from Seeing that no voice came from the watch to stop them, the captain of...
Chapter 210, "Are All of Jiang Li's Fans Hidden Big Shots?", is the clearest early answer because it turns Sister Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with This was Zhao Lang's first public appearance.
Chapter 412, "Successfully Landing on the Island", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 310, "Sister, Eat More", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, Jiang Yan snorted, "Then, Grandpa, you just talk less, so Uncle Three.... By the end, Later, when her second uncle became successful, the old master saw....
Chapter 458, "Where Did Everyone Go?", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. A useful checkpoint is the way the scene starts with On the other side, Su Yinwan also saw Jiang Li's ranking.