Disclaimer: First Chapter
Story Start!

It was an interesting development.

It was the 3rd day of non-stop combat, and it was visibly wearing them all down. Their bodies had no visible wounds, and their stamina was always at full thanks to Naruto, but their mental stamina had drained quite a lot. He was wearing down their ability to stay focused on strategy and planning, which was good.

Their growth was also different.

Issei had barely grown in strength, it took him the longest to get used to the training whenever he kicked it up a notch. That was to say, his base level was just so low, that by the time Koneko or Yuuto picked up the level to the next notch, Issei had yet to catch up to the level before.

He would say it like this.

When they started.
Koneko: Level 1
Yuuto: Level 1
Issei: Level 1

They all started at the same base training, and though some of them were clearly stronger than others at the start, he was giving them the same level of training in total. Yuuto wasn't too far behind Koneko when she jumped them up to Level 2 combat training, and when Yuuto got ahead of Koneko, she wasn't too far behind. When Koneko or Yuuto had caused them to go up to Level 4 combat, Issei was just getting up to Level 2.

Now it was like this.
Koneko: Level 6
Yuuto: Level 9
Issei: Level 2

Now that was not to say Koneko was 7 times stronger than when she began, that was not the case. He was just keeping the level system in his head to mark their overall progress, and how quickly they were getting stronger at any rate.

'Koneko has started to reach a barrier that is preventing her from going any further than this, while Yuuto is being driven by something dark enough that it is pushing him forward... and Issei... is scrapping by, by the skin of his teeth.' Naruto thought with a laid back smile. Issei was going to have to suck in his gut, and really give it his all soon. He was giving it his best, but if Naruto wanted him truly dead, he would have been dead by this point.

Still, improvements were improvements, and Issei was getting to the point where he, in theory, would have been at the 3rd level of combat to some degree.

"Now remember, don't do this training with anyone but me. The requirements for this training are an opponent that can heal you, and hold back against you." Naruto put Yuuto into another near-death state, before he slammed his hand into Issei's face and broke his neck once more, and he did both of them with a clear move.

Koneko threw a boulder at Naruto, and he shattered it, grabbed a rock from the air, and launched it at her fast enough that she was launched backwards when it hit her stomach. The rock sank into her slightly, and it was pushed out of her body when his healing took place.

In moments, the trio were back on their feet.

"Grrrrrrr... this... this is insane... I hate this, but no matter how much... why couldn't you be a hot woman! Why couldn't you have nice titties... I might actually be able to do something... I might get that spark I need!" Issei shouted with tears of rage in his eyes.

"Sorry about him."

"He's a pervert." Koneko deadpanned as Yuuto apologized, the two of them had expected this outburst far sooner than this. As it were, the mental weakening they were all going through had taken a toll on them all mentally. It was only Naruto's chakra that kept them in perfect health that allowed them to stay on their feet.

Naruto tapped his finger to his cheek.

"Well... I guess it wouldn't hurt to tell you... this male form I'm taking, technically I can also take on a female form... but I only do it against really powerful opponents... and my girl form has really big boobs." Naruto gestured with some teasing, not completely lying or telling the truth.

Issei froze.

3 days of mental weakening had taken to him, and he had been pushed beyond his limit. Latent magical power burst forth from his body as he gave a loud roar of enthusiasm, and newfound determination.

"I will see that form! Come on Sacred Gear, give me power! GIVE ME EVERYTHING TO SEE AND HUMILIATE THIS BASTARD's GIRL FORM!"

Koneko and Yuuto palmed their faces, they could agree with the sentiment, but they couldn't help but feel ashamed of Issei as his motivation burst forth from the most simple of base desires.

"I see, so the conditions are set... okay Issei, use this chance. I'll keep your stamina filled for you, and I'll keep healing your damaged body. Go for it." Naruto crossed his arms.

Issei's body glowed.

Red dragon armor covered his body moments later, green glowing eyes from under the helmet of the armor, and red dragon wings came out of the back of the armor. It was his Balance Breaker, and it had manifested. Issei being pushed to the point of death endlessly over the course of days, being forced into a mentally weakened state, humiliated, and then told about the Sexy Form had been to much for him. It had truly pushed him into achieving the next level of his Sacred Gear.

His Sacred Gear started to chant boosts.

Issei reached his full power.

He charged Naruto, but Naruto still caught his fist and punched him in the stomach, cracking the armor and revealing his stomach to the world. Naruto healed Issei, and the armor repaired in response to this as well. Still, Naruto sent Issei flying back, before he rushed towards Yuuto and shattered one of his swords, and he kicked Koneko in the side of the head. The two of them were knocked far back.

'Harder than before!'

'Does this mean Issei surpassed us?!' Yuuto thought in shock when he and Koneko were both placed into the near-death state once more. Naruto used more speed and power than before, and neither of them had kept up with it.

Issei rushed at Naruto from behind.

"Your form is still sloppy, but you're throwing punches better now." Naruto dodged it, and he broke Issei's extended arm, before snapping his neck with a punch that sent him into the air. Issei, Koneko, and Yuuto were all healed before Issei had time to hit the ground, and were getting back to their feet. This was the kind of training that got results it would seem.

-17 Hours Later-

It had changed.

Issei's Balance Breaker had taken him to 2 Levels above Yuuto's Level in an instant, and but that was about it. His skill as a fighter was still growing slower, but he was managing to at least grow physically better than Yuuto or Koneko purely in that aspect. Yuuto was managing to keep up with Issei's growth to some degree, though it was mostly slower overall.

Koneko was being left behind.

Now it was.
Koneko: Level 6
Yuuto: Level 11
Issei: Level 12 (Balance Breaker)

Still, Koneko had not been weakened enough mentally to shatter the limits that she was placing on herself. Naruto could see the intense internal struggle inside of her, if it were not for that struggle, she could have been on par with Yuuto's growth by the point they were at. Yuuto was growing the least in physical strength, but he was sharpening his skills overall which allowed him to keep up, and Issei was increasing his raw ability and combat power overall, but Koneko was increasing neither as much.

So now she was the one who was getting beaten to near-death the fastest.

'... Even the pervert is...' Koneko could barely think properly.

She took a hit to the stomach that had Naruto's fist go through her body and come out her back, before he grabbed her face and threw her right off his arm. While Yuuto and Issei rushed at Naruto from either side with a punch and slash, he caught the punch and used Issei's arm to block the slash. When Issei turned around and went for a second punch, that was when Naruto increased the level of training again.

Issei did not like that.

Now they were at Combat Level 13.

"GAH!?"

'The pain... every time I think I get used to this pain, he finds a way to make it hurt even worse.' Yuuto was nearly cut in half by Naruto's hand. He was only connected by his spine, and even though his body was rapidly healing, this was the worst level of injury that he had recieved yet. He scrambled to his feet.

Koneko slammed her fist into the ground when she saw Yuuto quickly recover, and she saw Issei quickly recovering as well.

She was being left behind.

"MREOW!" Koneko roared as she lost it.

She broke.

She was too exhausted, white cat ears grew from her head and she rushed at Naruto, white flames gathering around her that she sent flying at Naruto. She had little control over them, but she still sent them at him. He swiped them away with his hand, just as a tail came out from her rear. She took a jab at him, and though most of her physical abilities stayed the same, her movements were sharper, more agile than before. She had more balance, and her magical abilities grew as well, and her speed got a small boost.

"Now... now we are talking." Naruto grinned when he saw he finally wore her down.

She wasn't thinking clearly, because her mind was too exhausted for her to be able to think clearly about what she was doing. He blocked 2 jabs, and she spun to kick him, but her kick was a fake. She pulled her leg back and moved into a spinning punch. He just knocked it to the side and punched the top of her head, and her chin hit the ground with a crack, and he kicked her to Yuuto as he ripped Issei a new one with a punch to the chest.

Issei's Balance Breaker.
Koneko's Mental Limiter broken.

"I'm not afraid of death! I'm not afraid of you, I'll kill you!" Koneko went back on the offense instantly, the second her body was healed she was back on the offense. She put all of her intent to kill into her blows.

"GOOD!" Naruto shouted as he blocked her hits with the back of his hands.

He backhanded her and knocked her away, blocked a punch from Issei and knocked him into the ground, and shattered Yuuto's sword with a punch that he continued, and hit the boy in the face. Koneko was already back on her feet though and took a swipe at him. She made use of his punch at Yuuto and that was her opening, he jumped over her swipe and stomped her into the ground.

"GUH!... Gotcha." Koneko grabbed onto his leg, even as blood spewed from her mouth.

Yuuto was already getting back to his feet, sword in hand, and Issei was already next to Naruto with a punch ready. Naruto smiled when he saw the most basic teamwork, the first teamwork that he had seen during the days that he had spent training them. Their attacks were closing in, and Koneko pointed her hand at Naruto and sent a white fireball right at him to add to the mix.

It was a burst of speed.

Issei and Yuuto were defeated again and blasted back, and Koneko ate her own fireball when it was sent flying back at her, and blew right up against her. All of them were blasted away, and Naruto stood unscathed with a wide smile on his face, a glint to his eye.

"Now this is progress! Now, keep coming at me with the intent to kill! It's the only way you're going to improve at this point! Now back on your feet!" Naruto ordered as he healed them all instantly.

Fear.

It was the first time they had TRULY understood the meaning of the word when they realized that they were now seeing Naruto do something that he had not done the entire time they were training.

He took a stance.

"This entire time..." Yuuto realized as a cold sweat broke out over his body, his eyes widened when he realized just how easy Naruto had been taken it on them. Something that they had never noticed, all of his attacks had taken place as a counter attack, and Naruto had not truly taken an attacking stance. His attacks came from a relaxed position.

"... just how much has he been holding back." Even Issei, EVEN ISSEI, could realize just how much trouble they were in.

"The training is going to continue like it has been, don't worry, I won't kill you... but now I'm going to say this... my attacks are REALLY going to hurt." Naruto gave fair warning.

They were defeated.

They were healed.

They were defeated and then healed again in less than a second, before they even had the time to fully register that they were being defeated. That was the difference, so Yuuto slapped his hand on the ground and blades started to shoot from it, and Koneko peppered the ground around her with punches to knock rocks into the air. She started to combo attack the rocks and send them flying towards her enemy, and she rained down fireballs with those rocks.

He weaved through them, punched Issei when he got too close, and exchanged blades with Yuuto for half a second before beating him, and then appeared in front of her.

"Now that your minds have been weakened, pull out your fighting spirit and strength them! Maintain this level of focus, guts!" Naruto shouted as he attacked Koneko right in her guts. "Be gutsy! Never give up, and attack with all you have! Be completely and utterly gutsy, and your skills will improve! You'll grow stronger, and you'll shatter the limits you thought you had!" Naruto roared his teaching to them.

'This is a completely different level...' Issei was implanted into a boulder.

'... just how much did he suffer to get to this point?' Yuuto could feel Naruto's heart through his fists, and they were fists born from suffering.

"I can go further!"

"Good, go further, but it's not going to be enough. Just because you say you can go further, doesn't mean you have the guts to back that up! Lets see those guts! Guts, courage, teamwork, the will to never give up, and something precious to protect! If you have all of these, then you've got what you need to get stronger!" Naruto roared as he punched Koneko right in the cheek, and knocked her face into Yuuto's face, and carried both of their faces into Issei's face.

"I need boobs!"

"Then the precious thing you want to protect is boobs, super stupid, but whatever works for you!" Naruto didn't understand it, but whatever that Issei found precious to him worked as a precious something to protect.

Naruto's words erased the fear in their hearts.

Even as they got their asses kicked, smiles couldn't help but work their way onto the trio's faces as his words range through out their bodies.

The training was just getting started.

Chapter End!
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