What if Naruto was Trained by Sosuke Aizen

Naruto smiled gently, his calm demeanor unwavering. "Just right. I also want to see the strength of the Uchiha clan's genius." He didn't refuse Sasuke's challenge. It made sense—Sasuke, as a member of the prestigious Uchiha clan, had access to resources and training far beyond Naruto's reach. He had started chakra practice early, guided by skilled ninjas, and his starting point was undoubtedly higher. This spar would give Naruto a clearer understanding of his own strength and talent.

This was the first time Naruto would face someone from a major clan, and he approached the fight with caution.

Sasuke didn't wait. The moment the words left his mouth, he dashed forward, his speed impressive for someone his age. He threw a punch, aiming straight for Naruto's chest.

Naruto's calm eyes flickered slightly as he effortlessly caught Sasuke's fist mid-air. "As expected of the Uchiha clan. Such speed at your age is impressive," Naruto said, his voice steady. "But it's still not enough to touch me."

Before Sasuke could react, Naruto swung his arm, sending Sasuke flying backward. In the blink of an eye, Naruto appeared in front of Sasuke again, his movements fluid and precise.

Naruto's punch looked light, almost ethereal, but when it connected with Sasuke's arms, the force behind it was anything but gentle.

"Bang!" Sasuke's body was sent flying again, this time crashing into a tree several meters away. He slid to the ground, his arms trembling from the impact.

Sasuke stared at Naruto in disbelief. How was this possible? They were the same age, yet Naruto's strength was on a completely different level. The punch had felt like being hit by a speeding train.

He had sparred with his older brother, Itachi, before, but those fights had been gentle, almost playful. Itachi had always held back, treating Sasuke with the care of an older sibling. But Naruto? Naruto didn't hold back. The difference was staggering.

"Sasuke, are you okay?" Naruto called out, his voice tinged with concern. He hadn't meant to hit Sasuke that hard.

"I can still fight," Sasuke said through gritted teeth, pushing himself to his feet. He wasn't ready to give up yet.

Sasuke charged again, this time with more determination. Naruto, however, suppressed most of his strength, allowing the fight to continue. He dodged Sasuke's attacks with ease, his movements graceful and precise.

Sasuke's frustration grew with each passing moment. No matter how hard he tried, he couldn't land a single hit. Naruto's calm demeanor only added to his irritation.

After several minutes, Sasuke was panting heavily, his stamina nearly depleted. Naruto, on the other hand, looked as composed as ever.

Realizing that physical combat alone wouldn't be enough, Sasuke took a step back. His expression turned serious. "Naruto, I'm going to use ninjutsu. I'm not perfect at it yet, so be careful. You might get hurt."

Naruto's eyes lit up with interest. Apart from the basic Three Basic Techniques, he had never seen other ninjutsu in action. Aizen, too, seemed intrigued.

"Fire Release: Fireball Jutsu!" Sasuke's hands moved in a blur as he formed the necessary seals. A moment later, a blazing fireball erupted from his mouth, hurtling toward Naruto.

The flames roared through the air, illuminating the training ground with their intense heat.

"The power is too small. There's no reference value," Aizen commented dismissively, his voice echoing in Naruto's mind.

Naruto, however, was impressed. He raised his sword, Kyouka Suigetsu, and slashed through the fireball with a single, fluid motion. The flames split apart, scattering into harmless embers that faded into the air.

"You're really strong, Sasuke," Naruto said with a smile. "That's the most powerful ninjutsu I've ever seen."

Sasuke stared at the remnants of his fireball, his lips twitching. He couldn't tell if Naruto was being sincere or just polite.

Despite the overwhelming gap in their abilities, Sasuke refused to give up. He challenged Naruto again and again, each time pushing himself harder. Though he was repeatedly knocked down, he kept getting back up, his determination unwavering.

Naruto admired Sasuke's resilience. He could see the Uchiha boy improving with each fight, his movements becoming sharper and more refined. It was clear that Sasuke was learning from their spar, adapting to Naruto's techniques and incorporating them into his own.

Finally, Sasuke collapsed to the ground, completely exhausted. His chest heaved as he struggled to catch his breath, but there was a spark of satisfaction in his eyes. He had pushed himself to his limits, and he could feel the progress he had made.

Naruto, on the other hand, was barely winded. He extended a hand to Sasuke, helping him to his feet. "You've improved a lot," Naruto said. "You're stronger than you think."

Sasuke managed a weak smile. "Thanks... but the gap between us is still huge."

Naruto shook his head. "Strength isn't just about power. It's about perseverance, adaptability, and the will to keep going. You have all of that."

As they sat under a tree to rest, Sasuke opened up about his family. He spoke of his older brother, Itachi, a prodigy who had joined the ANBU at a young age. Sasuke admired Itachi but also felt the weight of living up to his legacy.

Naruto listened intently, offering words of encouragement. He could see the pressure Sasuke was under, and he admired the boy's determination to carve out his own path.

Just as the two were beginning to bond, Rock Lee appeared at the edge of the training ground. His usual energetic demeanor was gone, replaced by a look of deep dejection. His shoulders were slumped, and his eyes lacked their usual spark.

"Long time no see, Lee," Naruto greeted, though his smile faltered at the sight of his friend's condition. He introduced Lee to Sasuke. "Sasuke, this is Rock Lee, a friend of mine. Lee, this is Sasuke Uchiha."

Lee forced a smile and nodded. "Hi... my name is Rock Lee."

But his heart wasn't in it. Seeing Naruto with Sasuke, a member of the prestigious Uchiha clan, only deepened Lee's sense of inadequacy. He couldn't help but compare himself to them, and the comparison left him feeling hollow.

Naruto frowned as he watched Lee. This wasn't the spirited, determined boy he had come to know. Something was clearly wrong, and Naruto was determined to find out what.

"Lee," Naruto said gently, "what's going on? You don't seem like yourself."

Lee hesitated, his eyes downcast. "I... I don't know if I can keep up with people like you, Naruto. You're so strong, and now you're friends with someone like Sasuke... I just feel like I'm falling further and further behind."

Naruto's expression softened. He placed a hand on Lee's shoulder. "Lee, strength isn't just about talent or background. It's about heart. And you have more heart than anyone I know. Don't ever doubt yourself."

Lee looked up, meeting Naruto's gaze. For the first time in days, a flicker of determination returned to his eyes. "You're right, Naruto. I can't give up. Not yet."

Naruto smiled. "That's the Lee I know."

As the three boys sat together under the tree, a sense of camaraderie began to form. Each of them had their own struggles, but they were no longer facing them alone.