Yes, there could be such fanfictions out there. Fanfiction writers often come up with creative and sometimes unexpected relationships between characters. In this case, imagining Naruto as Tsunade's little brother can lead to a whole new set of storylines. It might involve Naruto having a different kind of support system within the village, and Tsunade being more protective of him in a sisterly way. This could also change the dynamics of his relationships with other characters like Jiraiya, who was Tsunade's teammate, and how Naruto learns about his family and the village's history.
If Naruto was Tsunade's brother in fanfiction, it would rewrite many aspects of the story. Naruto would have a different family background and a connection to the Senju clan through Tsunade. This could lead to different power - up scenarios. For example, he might have access to more resources related to the Senju. His relationship with other characters would also shift. Characters like Jiraiya might interact with him differently, seeing as he now has a closer connection to Tsunade. And politically, his status within the village could be elevated due to his relation to Tsunade, who is an important figure in Konoha.
Naruto could inherit Tsunade's medical ninjutsu skills. This would be a huge addition to his arsenal. He could use it to heal his comrades more effectively during missions. Also, he might inherit her ability to store chakra in his forehead. This would give him an extra boost of power when he needed it most. And perhaps he could also learn some of Tsunade's more precise combat techniques that rely on her strength and accuracy.
There are likely to be some. Fanfiction is a vast world where all kinds of alternate universes are created. You can start your search by typing in the relevant keywords in the search bars of popular fanfiction platforms. It's also possible that you might need to dig a bit deeper, as not all fanfictions with this specific plot might be easily accessible at first glance. You may also encounter different interpretations of how this relationship would work within the Naruto universe, which can make the reading experience quite interesting.
In a fanfiction where Naruto is Tsunade's little brother, many aspects of the story would be altered. Firstly, Naruto's emotional state might be more stable as he has a family figure like Tsunade. She could have provided him with better guidance, not just in terms of ninja skills but also in understanding his place in the world. His relationships with other characters would also shift. For example, Sakura might see him in a different light, perhaps more as a valuable connection to Tsunade and her medical knowledge. His power growth could be different too. With Tsunade's influence, he might focus more on physical strength and medical ninjutsu in addition to his normal training, and this could change how he faces his enemies in battles. Also, the village's view of him would be more positive from the start, as being related to Tsunade would give him a certain level of respect.
She might be initially shocked. Given her own past traumas and her relationship with Naruto, she could be hesitant at first. But then, considering Naruto's lonely situation, she might warm up to the idea and show a more maternal side towards him.
If Tsunade kisses Naruto, it could strengthen their relationship in a mentor - like way. Naruto might see it as a sign of deep respect and trust from Tsunade. He would likely feel more confident in following her guidance. For Tsunade, it could be a way of showing her pride in Naruto's growth.
One possible reason could be a misunderstanding. Maybe Tsunade received some false information about Naruto that made her think he was a threat to the village, so she took actions that ended up hurting him.
Naruto might be initially confused. He trusts Tsunade, so being kidnapped by her would be completely unexpected. He would probably start by asking her why she's doing this.
One great 'Naruto and Tsunade Fanfiction' is 'The Mentor and the Student'. It explores Tsunade's role in Naruto's growth further. It shows how she not only teaches him medical ninjutsu but also imparts wisdom about leadership. Another one could be 'A Different Bond' which delves into their relationship in a more emotional way, showing how they support each other through tough times in the village. There's also 'Naruto and Tsunade: The Unseen Alliance' which creates unique adventures for them that are not part of the original storyline.