Marrow might be a bit cautious around Kimimaro at first, given Kimimaro's rather intense and somewhat dark nature. Sakura, on the other hand, would likely be more open - minded. She might try to start conversations and break the ice. Kimimaro would probably be quiet and reserved, observing Marrow and Sakura. He may not be very talkative but his actions would speak volumes. Marrow could gradually warm up to both of them as they face challenges together.
Well, Naruto and Kimimaro could start off as strangers who are forced to interact because of the saving situation. As time goes on, they discover that they both have a longing for a family and a place to belong. They would open up to each other about their past traumas. This sharing would create a deep emotional connection between them, and they would become close friends, supporting each other through future challenges.
Their relationship could develop in a very brotherly way. Naruto would see Kimimaro as someone who needs help and guidance, just like he saw many of his friends in the past. He would teach Kimimaro about the value of life and the importance of protecting others. Kimimaro, in turn, would become very loyal to Naruto, protecting him when needed.
Begin by researching both Kimimaro's character from Naruto and the other franchise you're crossing over with. If it's a crossover with Attack on Titan, understand the world of Titans and how Kimimaro's abilities could be used against them. You can start with a simple premise like Kimimaro being accidentally transported to the Walls and having to adapt. Also, focus on character development. How will Kimimaro change as a result of this crossover? Will he make new friends or enemies?
You can start by searching on fanfiction websites. Some well - known ones have a large collection of Naruto - related fanfictions, including yaoi ones. Just type in 'kimimaro and naruto yaoi fanfiction' in the search bar.
One important aspect is the setting. Since it's related to Kimimaro Otsutsuki, it should be in line with the Naruto - like world. You can describe the landscapes, the villages, and the different ninja clans. When writing about Kimimaro, stay true to his character. If he is known for his loyalty in the original series, don't make him act out of character in your fanfic. And make your OC bring something new to the story, whether it's a new jutsu or a different perspective on the ninja world.
One interesting aspect in Sakura and Kimimaro fanfiction could be their interactions. For example, if the fanfic is set in an alternate universe where they meet as allies rather than enemies. Sakura might be intrigued by Kimimaro's loyalty to Orochimaru, and try to understand his motives better. This could lead to some really unique character development for both of them.
If they teamed up, it would change the story significantly. Their combined strength would be a force to be reckoned with. Naruto's Rasengan and Kimimaro's bone - related jutsu could create unique and powerful attacks. Enemies that were previously difficult to defeat would now have a harder time. For example, against the Akatsuki, they could take on multiple members at once.
Another theme could be the power struggle. Kimimaro has unique and powerful abilities, and Sakura is no slouch either, especially as she grows in strength. Fanfictions might play with the idea of them competing or having to work together in a situation where their powers are put to the test.
I'm not sure if there is such a specific fanfiction. There are countless Naruto fanfictions out there, and while the idea of Naruto being Kimimaro's brother is quite an interesting and unusual concept, it might not be a common one. You could try searching on major fanfiction websites like Fanfiction.net or Archive of Our Own to see if it exists.