One possibility is that Hinata would be overjoyed. She has loved Naruto for a long time, so his confession would likely make her very happy. She might blush and stammer out a response. Maybe they would share a tender moment and start a relationship right away, with Naruto finally realizing how much Hinata means to him.
The story might develop with a focus on how Naruto's feelings have changed over time. He may start to see Hinata in a new light, noticing all the little things about her that he overlooked before. This new perspective can add a layer of depth to their relationship, as they both discover new aspects of each other and grow closer emotionally.
Many fanfictions show Hinata's growth in her self - confidence. Because of her love for Naruto, she begins to assert herself more. She might stand up to those who underestimate her or Naruto. In some stories, she even becomes a key figure in the village, all while her love for Naruto remains at the core of her character. Her love gives her the motivation to overcome her insecurities and be a better shinobi and person.
One popular Hinata and Naruto love fanfiction is 'A New Beginning'. It shows their relationship growing in a different post - war scenario. Another is 'Love in the Hidden Leaf', which focuses on their daily interactions filled with love and understanding. And 'The Promise of Forever' is also great, it delves deep into how they support each other in their ninja duties while being in love.
One scenario could be that Naruto is initially shocked but then quickly realizes his own feelings for Hinata. Another might be that Hinata's confession causes a stir in the village as it's a very public event. Or perhaps Naruto is in the middle of a difficult mission and Hinata's confession gives him new motivation to succeed.
Often, in these fanfictions, the development of their love is also influenced by the people around them. Their friends might notice Hinata's feelings for Naruto long before he does. And through some gentle nudging or matchmaking attempts by their friends, Naruto starts to consider Hinata in a romantic way. Also, Hinata's family's acceptance of Naruto can play a role. Naruto, who has always craved family, feels a deeper connection to Hinata when he realizes how her family welcomes him.
She might become more confident. Since Naruto now knows how she feels, she doesn't have to hide her emotions as much. So she could be more open in her interactions with Naruto.
He could also introduce her to his friends and the wider ninja community. By expanding her social circle, Hinata can feel more accepted and less isolated, which is important in overcoming trauma. For example, Sakura could teach her some medical ninjutsu to boost her confidence.
Naruto could teach Hinata how to use the Rasengan. Since it's one of his signature moves, he could break it down and help Hinata understand the chakra control required. He might also train her in combat situations where she has to think on her feet, like he does in his battles.