Maybe Naruto is sick of Sakura in fanfiction because her character is often portrayed as too pushy or one - dimensional. In some fanfictions, Sakura might be overly obsessed with Sasuke and Naruto just gets tired of her constantly going on about it.
They can start by developing Sakura's character more fully. Give her new interests, skills, or goals that don't revolve around Sasuke all the time. This way, Naruto might find her more interesting.
Perhaps a bigger threat or a common enemy could emerge. This would force the three of them to work together more effectively. Sakura would then realize that hitting Naruto is counter - productive and Sasuke would be glad that the situation has changed. For example, if a powerful new enemy attacks the village, they would need to focus on defending it together rather than internal squabbles.
Sasuke could be sick of it because he values Naruto's strength and potential. He knows that Naruto is important for their village and for their future battles. Sakura hitting Naruto could potentially harm Naruto physically or mentally, which Sasuke doesn't want as it could affect their overall power balance and the future of the village.
One possible scenario in this fanfiction could be that Sakura tries to hide her sickness at first because she doesn't want to worry her teammates. Maybe she has a mission coming up and she's determined to prove herself. So she pretends to be fine during training but then starts to show more obvious symptoms like dizziness and weakness. Her teammates, especially Naruto and Sasuke, might notice something is off and start to take care of her. They could bring her medicine and make sure she rests.
Well, Naruto for sure. His friends from Team 7 are highly likely to be in it. But also, characters like Tsunade. As the Hokage and a great medical ninja, she could be consulted if Naruto's illness is really serious. Jiraiya might also make an appearance in Naruto's sick day fanfiction, perhaps reminiscing about his own times when he was sick as a young ninja.
Well, it could be that Sakura gets a strange illness that no one in the village has seen before. This causes panic among the medical ninja as they try to figure out a cure. Meanwhile, Team 7 is determined to find a way to help her. They might go on a quest to find a rare herb that is said to have healing properties. Along the way, they face various challenges and enemies. Naruto's determination and Sasuke's skills are put to the test as they fight to save Sakura.
In many Naruto Shippuden fanfictions where Naruto gets sick, it often shows a different side of his character. Usually, his friends like Sakura and Kakashi would be very worried. Sakura might use her medical skills to take care of him. And his enemies might take this opportunity to try and attack. But Naruto's strong will would still be there even when he's sick. He might not be able to fight as powerfully, but his determination to protect the village would remain unshaken. This kind of fanfiction can explore the relationships in the Naruto universe more deeply when the main character is in a vulnerable state.
Well, in many fanfictions, characters like Sakura might immediately take on a more nurturing role. She could be seen gathering medical supplies and constantly checking on Naruto's condition. Kakashi, on the other hand, might show his concern in a more understated way. He could be by Naruto's side, offering quiet words of encouragement or just being there as a reassuring presence. Sasuke might initially seem aloof but could end up showing his care in his own unique way, perhaps by secretly training extra hard to protect the village while Naruto is sick.
One common plotline is that Naruto's friends take care of him. For example, Sakura might use her medical skills to nurse him back to health. Another could be Naruto having flashbacks or deep thoughts while sick, perhaps about his lonely childhood. And sometimes, enemies might take advantage of his weakened state, leading to some tense situations where his friends have to protect him.