The house might hold the truth about Naruto's birth. There could be records or something that reveals more about the circumstances of his birth, like why he was chosen to be the Jinchuriki of the Nine - Tails. This would be a huge revelation for Naruto.
He might find old mementos of his parents. Maybe a photo album that shows their life before he was born. It could be filled with pictures of his father's training days and his mother's gentle smiles. This discovery could give Naruto a deeper understanding of his family's history and make him feel more connected to them.
Iruka could play a role. He was Naruto's first teacher who believed in him. He might have some small piece of information that starts Naruto on his journey to find his parents. Then there's Tsunade. As the Hokage, she has access to a lot of secret files. She could either be an obstacle, not wanting Naruto to dig too deep, or she could be a helper, providing him with crucial information. And of course, the Nine - Tailed Fox. It was sealed inside Naruto by his father, so it might have some memories or knowledge related to Naruto's parents that it could share with Naruto.
At first, Naruto might be a bit hesitant. He's not used to having something so personal from his parents. But then, his curiosity would get the better of him, and he would slowly unroll the scrolls, his hands trembling slightly as he realizes that he's about to learn things he has always dreamed of knowing about his parents.
Well, it could be that Naruto is on a mission and accidentally uncovers a powerful jutsu that has the power to show the past. And through this, he sees his parents. His father might give him some advice on how to become a better ninja or how to handle the power within him. His mother could tell him how much she loved him and why they had to sacrifice themselves. Then Naruto could use this new understanding to face his enemies more bravely.
His confidence would probably soar. Knowing he has his parents, who are likely strong ninjas, supporting him would make him feel more secure. He might become a bit less reckless as he now has people who care about him deeply and he wouldn't want to worry them.
Well, it could be about Harry Potter finding a will left by his parents. Maybe in this fanfiction, the will contains secrets about his family, his heritage, or some sort of magical items or powers that were meant for him. It might also reveal things about his parents' past and their relationships with other characters in the wizarding world.
In the fanfiction, the scrolls could reveal a lot. For example, they might disclose the circumstances of Naruto's birth. Maybe there are prophecies written in them about Naruto's future. There could be stories of his parents' love and how they made sacrifices for the village and for Naruto. It could also be that the scrolls contain some sort of training method that was unique to his family, which would help Naruto become even stronger as a ninja.
Naruto would probably want to introduce his parents to all his friends. It would be a big moment for him to show off his family, especially to Sasuke. His relationship with Sasuke could also be affected in a positive way as Naruto now has a more complete family.
Well, one thing that could happen is that Naruto would be overjoyed. He has always longed for a family, and to suddenly find out his parents are alive would be a dream come true. He'd probably have a million questions for them about his past, why they had to be away, and what their lives were like. And his relationship with his friends might change a bit too, as he now has this new family aspect to his life.