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.
Maybe Naruto is framed for a crime he didn't commit. Sasuke and Sakura believe in his innocence wholeheartedly. Sasuke starts investigating secretly, using his stealth and intelligence. Sakura, on the other hand, publicly defends Naruto, gathering evidence to clear his name. Their actions prove Naruto's innocence and also show their protective nature towards him.
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 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.
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 interesting plot point is when they have to face an enemy who can manipulate time. Sakura and Sasuke have to work against the odds to keep Naruto safe. Sakura uses her chakra control to try and disrupt the time - manipulation, while Sasuke uses his Rinnegan (if he has it in the fanfic) to counter the enemy's attacks directly related to Naruto.
One common plot point is Naruto finally realizing his deep - seated feelings for Sakura and deciding to actively pursue her. He might start by being more present in her life and trying to show her how much better he can be for her than Sasuke. Another plot point could be Sasuke's reaction. He might initially be angry or indifferent, which then adds to the drama. And Sakura herself often has to go through a period of confusion as she tries to figure out her true feelings between the two.
One interesting plot point could be how the other characters in the Naruto world react to the fem Kyuubi's protectiveness. Some might be suspicious, while others might see it as a positive change. For instance, Kakashi might be initially cautious but then come to realize that it benefits Naruto's growth.
Well, one interesting plot point could be how Sasuke and Sakura adjust to married life. Maybe they have to deal with Sasuke's past traumas affecting their relationship. Another could be Sakura's growth as a kunoichi while being a wife.
A plot point could be a love triangle that is initially misinterpreted. Maybe Sasuke seems closer to someone else, which makes Naruto and Sakura jealous. But in reality, Sasuke is just trying to protect them from a hidden threat. This misunderstanding adds drama and tension to the story.
A common scenario is during battles. Sasuke, with his Sharingan and combat skills, will shield Sakura from enemy attacks. For instance, if they are facing a powerful enemy ninja, Sasuke would put himself in front of Sakura to take the brunt of the attack.