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.
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 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.
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.
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.
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.
Naruto uses his ninja skills. He's always on high alert, using his enhanced senses to detect any potential danger. His quick reflexes mean he can react in an instant if anything threatens the baby.
One heartwarming scene could be Naruto making baby food with his own unique style. He might use his ninja skills to quickly chop up fruits and vegetables, all while the baby is giggling at his energetic movements. Another scene could be Naruto tucking the baby in at night, using his shadow clones to create a little show for the baby to fall asleep to.
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.
On the other hand, Fugaku could also be a very loving father in fanfiction. He might spend a lot of time just holding baby Sasuke, looking into his eyes, and thinking about how much potential his son has. He could be very gentle when Sasuke is fussy or crying, trying to soothe him in a very tender way.
One common scenario is when Naruto gets injured during a mission. Sasuke, being the one to take care of him, uses his skills to heal Naruto or at least keep him stable until proper medical help arrives. Another scenario could be Sasuke protecting Sakura from an enemy's attack, perhaps even sacrificing himself a bit in the process. And sometimes, Sasuke might help Sakura in her medical research, providing her with rare herbs or knowledge he's acquired during his travels.