One possibility is that Naruto would be extremely clumsy at first. He's not exactly the most domestic type. But his determination to take care of Sasuke would shine through. He might struggle with things like changing diapers or getting Sasuke to eat. However, as time passes, he would start to get the hang of it and form a really strong bond with baby Sasuke.
In this fanfiction, Naruto could use his own experiences of being alone as a child to make sure Sasuke doesn't feel lonely. He'd probably take Sasuke on adventures around the village, showing him all the cool places. And when Sasuke cries, Naruto would do his best to comfort him. Maybe he'd tell Sasuke stories about his dreams of becoming Hokage, and Sasuke would just look at him with those big, innocent eyes.
The story might also involve Naruto protecting baby Sasuke from potential threats. Given the history of the Uchiha clan, there could be people who still hold grudges or see Sasuke as a target. Naruto, with his strong will and growing skills, would stand in their way. He would teach Sasuke about the importance of friendship from a very young age, which could potentially change the course of Sasuke's future.
The story could explore the bond that forms between Magnus and baby Raphael. Since Magnus has such a long life and a lot of experiences, he would be in a unique position to shape Raphael's early life. He might tell Raphael stories of his adventures, and as Raphael grows, these stories could inspire him to be brave and kind.
There could be moments of frustration for Naruto, especially when Sasuke is fussy or won't do what Naruto wants him to. But Naruto's love for Sasuke would override that. Emotionally, Naruto would be pouring all his love into taking care of Sasuke, trying to give him the family he never had. And Sasuke, even as a baby, might show signs of his future strong - willed self, which could both amuse and challenge Naruto.
In the fanfiction, Naruto would be super protective. He'd use his ninja skills to keep the baby safe from any harm. For example, if there was a threat, he could quickly create a barrier around the baby using his chakra. Also, he'd be really patient, which is a bit different from his usual impulsive self when it comes to taking care of the baby.
One possible plotline could be that Naruto gets seriously injured during a mission. Sasuke and Sakura, with their combined skills, take him in and nurse him back to health. They might have to deal with Naruto's stubbornness when it comes to resting and following medical advice. Sakura could use her medical knowledge, while Sasuke could provide protection and also train Naruto in new techniques once he's recovered a bit, strengthening their bond as friends.
Well, Naruto might be really confused at first. He's from a world of ninjas and suddenly has to take care of a baby wizard. He'd probably use his ninja skills to protect Harry. For example, he could set up traps around the house to keep bad guys away. And he'd surely try to feed Harry some ramen, which might be a bit strange for a baby used to wizard food.
Well, perhaps when Sasuke protects baby Sakura from a small danger, like a wild animal approaching. He stands in front of her, kunai in hand, his eyes full of a fierce protectiveness. And also when he tucks her in at night, making sure she's warm and comfortable, it's really sweet.
Sasuke becomes more gentle. Usually he is cold and aloof, but with baby Sakura, he has to be soft. He shows more patience as he takes care of her needs, like when she cries and he tries to figure out what's wrong.
A great plotline could be Sasuke trying to raise Naruto while also dealing with his own inner demons. He might see Naruto as a chance for redemption. Sasuke could introduce Naruto to the Uchiha heritage in a positive way, teaching him about things like the Sharingan even though Naruto doesn't have it. And there could be heartwarming moments of Sasuke reading bedtime stories to Naruto that are actually about the great Uchiha warriors.
At first, it might be a bit rocky. Sasuke is not used to taking care of a baby. But as he spends more time with Naruto, he starts to care deeply. Naruto, as he grows up under Sasuke's care, would look up to Sasuke like a father figure. They would develop a mutual trust and understanding.
The story could center around the magical ways Harry uses to take care of baby Hermione. Since they are in the wizarding world, he could use spells to make feeding time easier or to keep her entertained. He might also have to protect her from any dark forces that might be lurking around. And along the way, he discovers a new side of himself, the side that is very nurturing and loving.