Often, in fanfiction, Naruto realizes his love for Hinata gradually. He starts to notice the little things about her, like how she always blushes when he talks to her, or how she's always there to support him no matter what. As he spends more time with her, these small details add up, and he finally understands that he's in love with her.
There are fanfictions where Naruto has a dream or a vision about a future without Hinata. In this vision, he feels a great emptiness. When he wakes up, he realizes that Hinata has become an essential part of his life, and his feelings for her are actually love. He then starts to look at her in a different light and begins to explore these newfound feelings.
In some fanfictions, Naruto overhears Hinata talking about her feelings for him to a friend. This makes him stop and really think about his own feelings for her. He might start to recall all the times she was there for him, and how her presence always made him feel good. This self - reflection after overhearing her conversation leads him to realize his love for Hinata.
Well, in the Naruto universe, Naruto's confession to Hinata would bring a lot of positive changes. Since Naruto has always been the center of attention, his relationship with Hinata would be a big deal. It would probably strengthen the bond between the Uzumaki and Hyuga clans. Also, Hinata has always been a quiet and supportive character, and with Naruto by her side, she could become more confident and play an even bigger role in the village's affairs.
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.
Often, shared memories play a huge part. They've been through so much together since they were kids. All those battles, training sessions, and emotional exchanges. As Sasuke reflects on these times in the fanfiction, he might start to see how Naruto has always been there for him and that his feelings are deeper than just friendship, thus realizing his love.
Fanfiction contributes by exploring different scenarios. For example, it can show them in everyday situations that the original series might not have covered. This gives a more complete view of their relationship.
He could be surprised and happy.
Hinata supports Naruto by being his emotional anchor. When facing the Juubi, Naruto can get caught up in the chaos and danger, but Hinata is there to remind him of his humanity and the things he's fighting for. For example, with a simple look or a kind word, she can calm him down in the heat of battle.
Naruto's confidence can make him more forward in his relationship with Hinata. He may be more likely to initiate conversations and interactions that deepen their bond. For example, he could be the one to ask Hinata on a proper date instead of the usual shy exchanges.
In many fanfictions, Hinata calms Naruto with her gentle presence. Just by being there beside him, her quiet and kind nature has a soothing effect on Naruto, who is often so full of energy and impulsiveness. For example, she might hold his hand or give him a soft, understanding look that makes him feel at ease.
It could also complicate their relationship. If they find out it was a love potion that made them feel this way, they might question whether their feelings are real or just the result of the potion. Naruto, being a straightforward person, might struggle with this idea. He wants to believe that his feelings for Hinata are genuine, but the existence of the potion makes him doubt.