It could be related to a mission. Suppose Naruto's arm has some special power or ability that is crucial for a mission, but Sakura disagrees with how Naruto is using or handling it, thus causing the confrontation.
Naruto often shows his care through his actions. He might use his healing techniques on Sakura if she's physically hurt. For instance, if she has a cut or a broken bone, Naruto could use his medical ninjutsu skills, which he has learned over time.
In this fanfiction, perhaps Naruto confronts Kushina about the secrets she kept from him. For example, if there were things she knew about his powers or his destiny that she didn't share before her death. He could be feeling betrayed and wants answers.
In the long run, this confrontation could be a turning point. If they overcome their differences, it could lead to a deeper and more mature relationship. For example, they might start to respect each other's views more and work together more effectively in future adventures.
Naruto's reaction could be complex. Since he has his own feelings for Sakura, this situation could stir up a lot inside him. He might initially be a bit hesitant in how to approach her because he doesn't want to overstep any boundaries. But in the end, his natural instinct to help a friend would take over. He would listen attentively to Sakura, his eyes full of determination to make her feel better, and use his own unique way of thinking to give her advice or just be a shoulder to cry on.
It could be that there is no traditional antagonist. The conflict might be internal, with Naruto's own emotions towards Kushina being the main source of drama.
One possible reason could be that his newfound 'godlike' powers make his family feel estranged. They might not understand his sudden transformation and the magnitude of his power, which creates a sense of fear or discomfort, leading them to ignore him.
He could also distance himself from them. Naruto might choose to avoid his family, not wanting to be around them as a way to show his anger. He could move out or stop participating in family activities.
Maybe he has some personal grudges or misunderstandings within the family in the fanfiction. It could be that something happened in the past that made him feel betrayed or unappreciated, so he refuses to offer help.