In some fanfictions, Naruto's control of the Kyuubi makes him so powerful that Sasuke feels threatened. However, Naruto uses this power not to overpower Sasuke but to show him that they can work together. He might share some of the knowledge he gains from the Kyuubi with Sasuke, like how to better control his own chakra. This could lead to a more equal partnership between them, where they both respect each other's strength and work towards a common goal of a better ninja world.
His relationship with Sasuke could improve. With the power of the Kyuubi under his control, Naruto might be able to better understand Sasuke's thirst for power. He could use his new - found strength to show Sasuke that there are other ways to achieve power and protect those he cares about. This might lead to Sasuke finally coming back to Konoha and the two of them becoming true friends again.
Well, Naruto having control of the Kyuubi might make Sasuke more envious at first. But as Naruto uses this power for good, Sasuke might start to see Naruto in a new light. Naruto could use the Kyuuki's power to help Sasuke deal with his own inner darkness, which was caused by the massacre of his clan. This could result in a deeper bond between them, where they support each other in their quests for peace and self - discovery.
Chapter 677, "Worshiping Sister While Avoiding Them", is the clearest early answer because it turns Jiang Zhao Yuan's situation into a concrete plot event. It opens with You should learn from your sister; she's made her own fortune and is...
Chapter 235, "Bungee Jumping in Ethiopia???", is the clearest early answer because it turns Valley's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Chasing Wind Youth was clearly becoming anxious, and as a result, his...
Chapter 720, "A Bastard Child Behaving So Arrogantly?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, As finals approached, with a wave of his hand, Jiang Li sent Jiang....
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Chapter 443, "Did Jiang Li Steal Team F's Home?", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. It opens with Team D's captain, curious, turned around and was surprised to find...
Chapter 523, "Are the Researchers Sweating Profusely Now?", is the clearest early answer because it turns Are's situation into a concrete plot event.
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