At first, Sasuke would be filled with rage. His Sharingan was something he had cultivated and was a symbol of his Uchiha heritage. Naruto stealing it would be like stealing his very soul. He would immediately try to hunt Naruto down. But as he chases Naruto, he might start to think about the reasons why Naruto did it. He could consider if there was some greater threat that Naruto was trying to combat, but still, he would not be able to forgive Naruto easily and would demand his eyes back.
Yes, it can be a somewhat popular trope in the Naruto fanfiction world. Some fans like to explore alternative relationship dynamics. They might be interested in seeing how Naruto's relationship with Sakura could develop in a scenario where he 'steals' her from Sasuke. It adds an element of drama and can lead to interesting character development as Naruto might have to overcome his own feelings, Sakura's prior attachment to Sasuke, and Sasuke's reaction if such a thing were to hypothetically happen.
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 possible plotline could be that Naruto is somehow influenced by a dark power. This power makes him believe that by taking Sasuke's eyes, he can gain ultimate power to protect the village. So, he sneaks up on Sasuke when he's vulnerable and steals his eyes. But then, he realizes the horror of what he has done and has to deal with the guilt and the consequences from both his friends and the village.
In fanfics where Naruto has Sasuke's eyes, his abilities would be altered significantly. The Sharingan is known for its power in genjutsu, so Naruto might become more proficient in that area. He could use genjutsu to deceive his opponents in new and unexpected ways. Moreover, the Sharingan's ability to predict an opponent's moves would blend well with Naruto's already great combat instincts. This combination could make him nearly unbeatable in battle, as he would be able to anticipate attacks and counter them with his own powerful jutsus.
Well, it could start with Sasuke being in a really dangerous situation where he's about to lose his eyes but Naruto intervenes. In the process, some sort of jutsu backfires and Naruto ends up with Sasuke's eyes. This would cause a huge shift in Naruto's relationships. His friends would be both worried and curious. And Naruto would be on a journey to master these new eyes while also trying to find a way to give them back to Sasuke if possible.
The main character of the book,"The Second Generation of the Wood Leaf," was a transmigrator. He became the experimental subject of the Thousand Hand Pillars and the Uchiha Spot. He had a Shura Eye and a White Eye. He was Sasuke's cousin. I hope you like my recommendation. Muah ~
Yes, there might be such fanfictions out there. Fanfiction is a creative space where all kinds of wild and unique ideas can be explored. Writers often come up with unusual relationships between characters just for the sake of exploring different storylines and character dynamics.
Naruto might protect Sasuke by using his physical strength. He's got those powerful jutsus like the Rasengan. If any enemy comes near Sasuke, Naruto can just blast them away with his attacks.
If Naruto had Sasuke's eyes in fanfics, it might make him more brooding. The Sharingan has a lot of baggage associated with it in Sasuke's story, and Naruto might take on some of that darkness. But at the same time, he would also be more in tune with Sasuke's experiences, which could strengthen their bond in a different way.