In fanfiction, Sasuke's protectiveness of Naruto and Sakura can be shown in various ways. For example, he might use his Sharingan to sense any approaching danger towards them. This could lead to some really intense and action - packed scenes where Sasuke jumps in to defend them against powerful enemies.
One example could be a fanfiction where Naruto stands in front of Sasuke and Sakura when they are facing a powerful enemy. He uses his shadow clones to surround them and protect them from harm. Naruto's determination to keep them safe is unwavering, and he even taps into new forms of his chakra to fend off the threat.
In a fanfiction, Sasuke and Sakura might be protective of Naruto in a more emotional sense. For example, when Naruto is doubting himself due to some rumors in the village. Sakura would be the first to stand up for him, using her sharp tongue to put the rumor - spreaders in their place. And Sasuke, in his own quiet way, would show his support by training with Naruto extra hard, as if to remind him of his strength.
One common scenario is during battles. Naruto would be right by Sakura's side, deflecting attacks aimed at her. Another is when Sakura is facing emotional distress. Naruto would be there to comfort her and protect her from any further emotional harm.
In fanfiction, Naruto's past experiences play a role in his protectiveness. He has lost so many people already, and he doesn't want Sasuke and Sakura to be added to that list. He has seen the pain that loss can bring, like when Sasuke left the village the first time. Naruto is also influenced by his ninja way. His sense of justice and loyalty drives him to protect those he cares about, which includes Sasuke and Sakura.
A plot point could be that Naruto is poisoned. Sasuke races to find the antidote, using his ninja skills to track down the source of the poison. Sakura stays by Naruto's side, using her medical ninjutsu to slow down the effects of the poison. Their combined efforts save Naruto in the end.
One reason could be that he sees Naruto as a younger version of himself in some ways. Both have had their share of loneliness and challenges growing up. Kakashi may want to prevent Naruto from going through the same pain he did. Another reason is Naruto's importance to the village. As the jinchuriki of the Nine - Tails, Naruto is a key asset. Kakashi, being a loyal ninja, wants to protect the village's future which is tied to Naruto.
Well, Naruto has a huge and passionate fan base. People are protective of Naruto fanfiction because it's a way to keep the Naruto universe alive. It allows fans to explore different storylines, relationships, and character developments that they might have imagined while watching or reading the original Naruto. It's like a creative extension of the beloved series.
Well, Rookie might protect Naruto by always being by his side during dangerous missions. For example, when facing strong enemies, Rookie could use his own skills to shield Naruto from attacks.