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.
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.
If it was consensual, they might consider counseling to deal with the complex situation. They need to think about the future, whether it's about raising the child together or other options like adoption. And of course, the doctor may face professional consequences and need to go through proper channels in the medical community to address those.
The dynamic would be turned upside down. Sasuke would likely become more of an outcast or a loner, feeling rejected. Naruto would be in a difficult position, having to balance his friendship with Sasuke and his new relationship with Sakura. Sakura would be the catalyst for this change, and she would have to face the consequences of her actions, like dealing with the villagers' opinions and the potential backlash from Sasuke's supporters.
In some fanfiction concepts, Sasuke might betray Naruto due to his unwavering pursuit of power and a different view of the ninja world. Sakura could be involved perhaps out of misguided loyalty to Sasuke. It could start with Sasuke believing Naruto is a hindrance to his goals and Sakura following Sasuke's lead, breaking Naruto's trust.
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.
Sakura could also handle it with a sense of pride. She is a strong character in her own right. So, instead of feeling like she is being forced into something, she takes charge of the situation. She makes it clear to Sasuke that she expects respect in this relationship. And as she continues to grow as a ninja and a person, Sasuke can't help but be drawn to her, changing the dynamic of their arranged marriage for the better.
Sakura could cope by training harder. She would pour all her frustration and confusion into becoming a stronger ninja. This way, she not only distracts herself but also becomes more self - reliant. She might also start to study old ninja scrolls to gain more knowledge, which gives her a sense of purpose other than the forced marriage situation. Another way she could cope is by trying to understand Sasuke better. By getting to know him on a deeper level, she may find a way to either accept the situation or find a solution to get out of it.
One possible reason could be her long - standing and deep - rooted love for Sasuke. Since childhood, she has had strong feelings for him. Maybe in this fanfiction, she realizes that her feelings for Sasuke are unshakable and that she can't continue to be with Naruto while having such intense feelings for another.
Natsu might need to prove through his actions that he has changed. For example, he could start being more respectful, listening to his girlfriend's feelings, and giving her space when she needs it. It would take time and effort to rebuild the relationship, but it could be possible if both are willing.