One possible plot could be that Naruto and Hinata are on a mission together. During the mission, they face a difficult obstacle that they can only overcome by relying on each other completely. After they succeed, the adrenaline and the new - found trust lead to a spontaneous first kiss.
It might occur when Naruto is training hard and gets injured. Hinata comes to his aid, tending to his wounds. As Naruto looks at her with gratitude, he realizes his true feelings for her. Hinata, seeing the look in his eyes, blushes deeply. Then, slowly, they share their first kiss, a tender moment filled with unspoken love.
Some fanfictions might have the first kiss happen in a more unexpected situation. For instance, Hinata gets injured while protecting Naruto, and when she wakes up, Naruto is so relieved and grateful that he impulsively kisses her. This not only shows his deep care for her but also how their relationship can be spurred on by intense emotions and life - threatening situations.
Well, they might be really embarrassed at first. Naruto could turn bright red and stutter, while Hinata might faint from the shock. Then they would probably avoid each other for a while, until their friends notice the strange behavior and try to get them to talk it out.
One possible story could be a post - war scenario. Naruto has finally returned to the village as a hero. Hinata, who has always loved him secretly, gathers the courage to confess her feelings. Naruto, realizing how much Hinata means to him, leans in for a kiss. It could be a moment full of emotion, with the villagers looking on happily, seeing the two of them together after all they've been through.
Maybe Naruko saves Hinata from a dangerous situation. For example, from some powerful enemy during a battle. Hinata, feeling extremely grateful and also realizing her deeper feelings for Naruko, might then share a kiss with her.
There are also some more creative fanfictions where Naruto might have his first kiss with a completely new character created by the writer. This allows for a whole new set of storylines and character dynamics that deviate from the original Naruto universe.
A simple plot could be that Hinata gets injured while on a mission, and Naruto takes it upon himself to nurse her back to health. During this time, they have long conversations and get to know each other on a deeper level, leading to the start of their romantic relationship.
It could be about a character in the Naruto universe having their first kiss. Maybe it's a story between two ninja trainees who fall in love during their training and share their first kiss.
It deepens their bond immediately. Their first kiss is like a confirmation of their feelings. After that, they become more aware of each other's presence and start to rely on each other more in both emotional and practical ways.
In this fanfiction, perhaps Hinata and Naruto are living together and learning more about each other on a deeper level. Hinata could be teaching Naruto some of the traditional Hyuga clan techniques, while Naruto shows Hinata some of his unique jutsu. Their living situation might also involve a lot of visits from their friends like Sakura and Sasuke, creating some really fun and heart - warming group dynamics.