One idea could be that Sasuke, despite his usually stoic nature, feels a sense of worry when he hears Naruto is sick on his birthday. He could visit Naruto and bring him some traditional Uchiha herbal medicine that he secretly prepared. This would show a soft side of Sasuke and also deepen their bond in the fanfic.
Perhaps Sasuke, being the proud Uchiha, tries to hide his concern at first. But the other villagers notice and start to nudge him towards Naruto. When he finally goes to see Naruto, he finds that Naruto is still as upbeat as ever despite being sick. This makes Sasuke respect Naruto even more, and he decides to stay with Naruto throughout his illness, and they end up having a stronger bond after Naruto recovers.
The fanfic could explore how Sasuke deals with his emotions when Naruto is sick. He might be conflicted between his old rivalry feelings and his newfound, deeper feelings for Naruto. Sasuke could also be the one to stay by Naruto's side when everyone else is busy. He'd watch over Naruto while he sleeps, and when Naruto wakes up, there could be a moment of intense eye - contact that shows the unspoken bond between them.
Sasuke could play a crucial role. He might use his Sharingan to detect what's wrong with Naruto more accurately. Then he could go on a mission to find a special cure.
A 'Happy Birthday Sasuke' Naruto fanfic could be about Naruto planning a surprise birthday party for Sasuke. He might gather all their friends from the village, like Sakura, Kakashi, and Shikamaru. They could decorate Sasuke's old house with symbols of his clan, the Uchiha crest perhaps. Naruto would also make sure to have Sasuke's favorite food, tomatoes, available in abundance. It could be a story full of friendship and nostalgia, showing how much Naruto values Sasuke.
Yes, there might be such fanfics in the vast Naruto fanfic community. However, these often deviate from the original story's canon. Fanfics are a creative space for fans to explore different scenarios, but they can vary greatly in quality and adherence to the characters' original personalities.
A fanfic could explore what if Naruto and Sasuke were fully aware of their Indra and Ashura identities from the start. Maybe they are born with memories of their past lives. This would completely change their relationship dynamic. They could be more united from the beginning, working together to reform the ninja world according to the will of their predecessors. They might introduce new jutsu and ninja teachings based on the ancient knowledge of Indra and Ashura, which would face opposition from the traditional ninja clans who are resistant to change.
A fanfic could be set in an alternate universe where Naruto and Sasuke are normal kids in a modern world. They meet at school and become friends over their shared love for martial arts. They have to face bullies together, which strengthens their bond. This would be a fun take on their relationship, away from the ninja world.
One possible plot could be that Sasuke has been away on a long mission and has forgotten his own birthday. Naruto, who has been keeping track, decides to bring the celebration to him. He travels to where Sasuke is and with the help of some local people, arranges a small, intimate party. They share stories of their adventures and Naruto gives Sasuke a new headband as a gift, one that represents their combined journey.
One idea could be that Naruto gets tattoos as a form of self - expression in prison. Maybe he uses the tattoos to tell his story or to mark his growth. For example, he could get a tattoo of the Hidden Leaf symbol but with a twist, like it's broken in some way to represent his broken relationship with his village while in prison.
For a Naruto birthday party fanfic, you could write about a time - travel themed party. Naruto accidentally gets sent back in time to the day he was born. He meets his parents and all the people who were important in his early life. They all celebrate his birth together, and Naruto gets to experience a new side of his family and the village's history. Or perhaps a party where the whole village turns into a giant ninja - obstacle course for Naruto's birthday. Everyone competes in the course, and Naruto has to overcome all the challenges his friends and villagers set up for him.