Triple Crossover: Naruto x Testament of Sisters new Devil x High School Dxd

Summary: He never wanted to survive but as always, he was lucky that someone found him and healed him. He lived his life without meaning until this specific incident. He had promised her that he would protect her at all costs. He never breaks a promise that is what Naruto Uzumaki is known for.

Disclaimer: I don't own Naruto, Testament of Sisters new Devil or High School Dxd.

Warning: English is not my first language. Be aware of possible errors. Also, since I mixed three different universes together, I created a new power system. That means that characters could be stronger or weaker in this story.

"Speech."

'Think.'

"Giant Creatures Speech."

'Giant Creatures Think.'

Naruto looked in the mirror and took a deep breath. The sun had already set two hours ago, and he would soon make the pact with Mio. He just hoped nothing crazy would happen.

Everything was prepared and all that was missing was the execution. He was currently only wearing short white pants and an orange muscle shirt. The ritual wouldn't take long and after that he actually wanted to go to sleep slowly. His body was still a bit tense from two weeks of training with Jin and he had done some training an hour ago.

His body wouldn't blame him if Naruto went to sleep earlier today. He looked out the window and saw the darkness in the sky. Today there were hardly any clouds to be seen and that's why the moonlight illuminated everything and bathed everything in a mysterious light.

He went out onto the balcony and looked up at the sky. His sky-blue eyes reflected the full moon and his golden blonde hair swayed slightly back and forth in the breeze that was currently blowing through Tokyo. Since his house was in the outer district, there weren't any high-rise buildings to block the wind.

"Don't be so nervous, nothing will happen."

Naruto sighed once and leaned against the railing. He turned his gaze to his garden and said, "I'm not nervous. I'm just thinking about how to get Zolgear without endangering Maria's mother." Naruto said.

"You're worried about something like that with the situation that could be about to happen? You really are incorrigible."

Naruto shrugged, "Mio and I know what we have to do. The ceremony won't cause any problems, but what happens after? There are 3 new heroes in town. I felt this on the way back from Ms. Hasegawa with Senjutsu. There's just a lot that could happen at the moment and I don't like the situation. Until now, I have always been able to react to everything, but now everything I plan could be thrown off course by just one small variable."

"You're right. But you weren't the strongest shinobi in the Elemental Nations for nothing. You may not be the fastest sometimes, but you've grown up now and can think clearly. You will do it and now you have me again."

Naruto smiled and nodded. "You're right. With you by my side, I know that I can do anything." Naruto said. "I'm still counting on you, partner."

"Someone has to look after you."

Bikō just appeared from a portal and was now standing in a room. The floor, ceiling and walls were all made of wood. It looked like a small cabin in the forest from the interior. A small fireplace, a bed, a table, a place to prepare food and a toilet in an extra room.

"There you are again."

Bikō grinned and said, "I told you it wouldn't take me long. However, I made an interesting discovery on my little trip. You definitely won't believe me at first, Vali," said Bikō.

Vali was a handsome young man with light silver hair and ice-blue eyes. He was wearing a dark green V-neck shirt with a high-collared black leather jacket over it. He also wore burgundy jeans with a silver chain drooping down over them and black leather chaps with three bands encircling his right calf, and black shoes with black buckles.

He was half-devil, so even as a devil it was possible for him to obtain Sacred Gear naturally. Vali's Sacred Gear was the Divine Dividing, one of the 13 Longinus Level Sacred Gears. Divine Dividing took the form of a pair of white Dragon wings on the user's back, with eight energy "feathers". The Divine Dividing had the ability Divide , which halves the enemies' power after physical contact and added the halved power to the user.

"Now you have piqued my interest," said Vali.

Bikō grinned "I had to save Yasaka's daughter and just when I reached little Kunō to finish off the two devils that were chasing her, the two were already taken care of." Bikō said.

Vali just looked at Bikō and waited for more information. Bikō sighed a little at the reaction, he had expected more than this. Vali was not like Bikō himself, who liked to fight or make jokes. Vali always had his big goal in sight and didn't talk much. He was the calm and silent guy. Of course, he could have a normal conversation with someone, but he remained silent in situations like this, where Vali knew full well that he hadn't heard everything.

"The little princess's savior was a high-class yōkai and a very special breed," Bikō said.

Vali raised an eyebrow in interest. The way Bikō told the story and his expression showed that he was serious. At the beginning, Vali had toyed with the idea that Bikō would make one of his jokes again. But now he really believed that Bikō was serious.

"As of today, there is officially another Nekoshō and a male on at that in this world," said Bikō.

Vali had expected a lot, but not this revelation. There should be a Nekoshō besides Kuroka and her little sister? Until now, no one would have ever thought that there was another living example of this rare breed, let alone a male.

"There is a male Nekoshō?" Vali asked.

"Yes, his name is Naruto Uzumaki, and he lives in Tokyo. I think it was him who created all the mysteries in Tokyo over the last two years," said Bikō. Even Team Vali, which consisted of Vali, Bikō, Kuroka and a few other members, heard about the rumors from Tokyo.

Someone must have sneaked into Tokyo and now had their base there. Until now, no one knew who it was or how many there were. Why had no one been able to find out the true identity of the person or group yet? Why had no faction declared control over Tokyo when there had been obvious activity by supernatural races in Tokyo for over two years?

"He's also strong and would have no problem taking down most people quickly," Bikō said. By this he meant the supernatural members of the races, which were not among the strongest. Someone who was only at the level of a High-Class Devil had no chance against Naruto. Bikō could see that straight away.

"This is really surprising. I never expected that there was another Nekoshō besides Kuroka and her little sister." Vali said. "Do you have any other information about this Naruto Uzumaki?"

"No. We only spoke briefly and since he hid his aura with senjutsu, I could only begin to imagine his strength. However, I can say that he is better at senjutsu than me. Even Kuroka can't hide her aura as well as this Naruto and she's a little better than me." Bikō explained.

"In addition, he hid his features and therefore didn't even radiate his full strength at that moment. Even with that, I couldn't properly assess his complete strength. But I'm sure he could give me a good fight." Bikō said with a grin.

"Oho? So, this Naruto Uzumaki is supposed to be that strong?" asked Vali. Now his interest was even more piqued. Bikō was a strong yōkai, one of the strongest. As a descendant of Son Goku, he had corresponding power. He was also able to give Vali good fights. Before the two formed a team, the two had already fought against each other a few times.

"It's just speculation, but I think so," Bikō said.

Vali nodded and sat on the bed. Bikō sat down at the small table that was in the hut and asked, "When did Kuroka and Arthur want to come back?"

"They should be here in the next 2 hours. Keep the information about Naruto Uzumaki to yourself for now," Vali said.

Bikō looked at Vali confused. "Why should I keep the information to myself? I'm sure Kuroka would be happy to hear this information." Bikō said.

"I want to meet him myself first before Kuroka finds out about it. It could well be that we won't see Kuroka again for some time if she finds out about this," Vali said.

"She would leave you alone that way," said Bikō with a grin.

Vali sighed and just nodded. Bikō was right. Kuroka wanted to bring her race back to life and of course she needed a partner to do that. Until now, Kuroka really wanted to have Vali's genes because he was strong and had a legendary dragon as a partner. Feelings weren't involved there, just her desire was in the foreground. But Vali had never responded to her flirting attempts and had given her the cold shoulder in those moments.

If she found out about Naruto Uzumaki, she definitely wouldn't bother Vali anymore. However, this could also have unknown consequences. Kuroka only joined the Kaos Brigade because she wanted to find a suitable partner and had heard about Vali. She only became part of his team because she wanted a baby from him, and she could get closer to her little sister more likely on his team than in another group.

"Anyway, get some rest. If Kuroka and Arthur are there, we have something to take care of. When the job is done, then you can tell the rest of the team about Naruto Uzumaki." Vali said. He lay on his back on the bed and put his hands behind his head and closed his eyes.

'Naruto Uzumaki huh? I'm excited to see how strong you are.' thought Vali.

"What's wrong?" Naruto asked and looked at Maria. The ritual had proceeded quite normally, as agreed. Maria had cast the spell and as she explained, a glowing symbol appeared on the back of Naruto's left hand. Mio hesitated only briefly before kissing the back of Naruto's left hand to successfully complete the ritual.

The symbol glowed more strongly during the kiss and at the same time a symbol appeared briefly around Mio's neck before disappearing with the symbol on the back of Naruto's hand. Everything had been fine, the yellow magic circle disappeared on the ground and Mio was completely normal.

They had even made tea and sat at the table together. When Naruto, Mio and Maria wanted to go to bed slowly because it was already night and everyone was slightly exhausted, it happened. Just as Mio got up and took 2 steps, she started shaking.

"I-I don't know. The pact has been completed successfully and the curse should not activate," said Maria. Both of them were currently kneeling on the floor next to Mio because she was panting with red cheeks.

"The pact must have been triggered by Mio-sama. She must have thought of something that triggered the pact," Maria explained.

Naruto looked from Maria to Mio, who was looking at Naruto with her eyes slightly open. "Mio..." Naruto said.

"S-sorry. I tried not to think about it..." She winced once because that feeling shot through her body again. Her head wasn't clear of all the emotions she was currently feeling. Normally she would never just admit this thing. Never in her life.

"But when you just mentioned Nonaka, I couldn't help but think about how close you guys are." Mio said and then looked away. She had her eyes closed and didn't want to look Naruto in the eyes. This was so embarrassing for her.

,She is jealous?' Naruto thought with wide eyes. He never expected Mio Naruse to be jealous of someone because Naruto had talked to Yuki and experienced some things with her.

The most beautiful girl in the entire school in Naruto's eyes was jealous...he didn't know what to think. He would never understand women, but that wasn't the most important issue.

What was important was that the curse had been triggered and Naruto knew what he had to do. "Mio, you don't have to worry. I'll never leave you; I hope you know that." Naruto said with a smile.

Mio looked at Naruto "I-I know! But I just couldn't help it!" said Mio.

"Ok, enough of that topic. Maria, I'll take care of Mio and go with her to her room. You can do whatever you want for as long as you want." Naruto said. He wanted to touch Mio to pick her up, but when she flinched and moaned slightly, even Naruto was surprised.

'Maria had explained to me that when cursed with Succubus magic, Mio becomes much more sensitive while the curse is active... but I wouldn't have thought that she would react so strongly to a simple touch.' Naruto thought.

"Hold on a little longer Mio, I'll free you from this." Naruto said. 'I hope your advice will work, Ero-Sennin.' Naruto thought. Even though Naruto had always complained back then, Jiraiya had given him several tips on how to really satisfy a woman.

Naruto tried to ignore it all, but there was a lot he couldn't ignore. Jiraiya had lured him with training if he would listen carefully. So, he had listened to all the stuff for special training and now he was happy about it. He just hoped that all the tips were true.

Naruto wrapped both arms around Mio's body and lifted her up like a princess. She was panting heavily and biting her lip to keep from moaning again in front of Maria and Naruto. Naruto looked at Maria "See you later and I'm warning you…. don't come into the room. I'll put up a barrier." Naruto said.

Maria got on the floor and held her hands together. "Naruto-sama, please grant me this once-in-a-lifetime chance to witness Mio-sama in this situation! I am a succubus, and it is my duty to witness something like this!" said Maria.

"FORGET IT!" Naruto shouted and attacked Maria with his bloodlust. Maria whimpered into a corner and whined to herself as Naruto walked out of the room. He sighed and looked at Mio. She had her eyes closed and seemed to be concentrating not to make strange noises.

When Naruto got to Mio's room, he laid her on the large bed and then went back to the door. He made a few straight movements with his finger and then several kanji characters appeared in the air. After a few characters, a barrier appeared in front of the door and sealed the room. The barrier was there to ensure that no one could get in or that noises would escape to the outside world. This way Naruto would make sure that no one would come in here and that no one could hear anything.

He sighed once and then looked over his shoulder. Mio was still laying on the bed, looking at Naruto as he stood with his back to her.

"When women are aroused and have decided to open up to you, they will appear very vulnerable and become very submissive. You have to take on the role of the man and take the lead. Especially when their eyes are only half open and they don't say anything. They are waiting for you to take the first step. Women always act as if they are unavailable to the public. In the past there has been enough history of women being taken advantage of and over time women developed instincts of self-preservation which is why they are so energetic. But when a woman has chosen you to be the man, she would have sexual moments with, many women drop all their defenses and want to be guided," Jiraiya said.

Naruto just nodded and said nothing. His look said clearly that he didn't believe his master. But he had made a deal so he could get more training. That's why he didn't comment on how stupid it all sounded.

'I really hope you're right.' Naruto thought to himself. He walked up to Mio and took off his orange muscle shirt and joined Mio on the bed. He had thrown the orange muscle shirt into the corner of the room. He wanted to show Mio that she wasn't alone in this.

He looked briefly at her neck where the green symbol was. The color of the symbol around the servant's neck indicated how familiar they both were. There were 4 different colors, indicating four different stages. Initially the symbol would be blue when there was no trust between master and servant. The next level would be green, which Naruto and Mio had already reached through their history with each other. Without submitting, Mio already had some connection with Naruto and so they had skipped the first stage of the pact.

The next level would be the color yellow, which indicated an even deeper connection. Not all masters and servants managed to achieve this level because the servant had to submit several times to reach the level. The fighting strength of master and servant would have increased accordingly because both would have deepened their trust several times and thus also their fighting strength.

The final stage had a special name where the mark around the neck would turn crimson red. The name would come from a master servant Contract to a Master Servant Vow. The Master-Servant Vow was the deepest submission that a Servant was able to give to their Master. It's the ultimate form of Master-Servant relationship, which existed between both a Master whose prepared for their subordinate to belong to them fully, and a Servant whose able to vow their heart and body entirely to their master.

Maria stated that there hadn't been many high-ranked devils able to reach this level of the Master-Servant Contract even among the ones who created it in the past, possibly due to the trust that was required from both parties involved in the process , but it was said that no one would be able to win against a Master and Servant who achieved this state. On the other side of the unbelievable power that comes with achieving this, was a forbidden relationship that couldn't be erased. This also causes the collar, which represents the Master-Servant Contract to disappear since there wasn't a need for their servant to be cursed anymore.

Naruto slowly raised his hand and brought it to Mio's face. Mio followed the hand with her eyes and when Naruto placed it on her cheek she responded to the touch, but not as strongly as before. She looked into Naruto's blue eyes and saw some kind of desire. She didn't know what it was right now, but Naruto's pupil seemed to have briefly become a black slit.

But she wasn't sure right now. Her feelings and emotions were on a rollercoaster ride at the moment. She didn't want to say anything for fear that she would say something bad to her rescuer. Her head was full Naruto's memories. Everything he had already done for her. It was only because of Naruto that she was able to live a normal life and laugh again. It was only because of Naruto that Mio was able to make friends and do normal things.

He gave her a safe haven and all her thoughts revolved around him. No matter what she did, in the back of her mind she always remembered those blue eyes that represented the endless sky and that golden blonde hair as if it had been kissed by the sun. Naruto represented everything good in her life and she never wanted to leave him.

Naruto was currently kneeling on the bed, with one hand on her cheek and the other supporting himself on the mattress. Mio closed her eyes, and he took that as a sign that he could move on. He leaned forward and kissed Mio on the lips.

Nothing in the world would have prepared him for the chaos of emotions that now pierced him like a spear. He couldn't believe that the touch of 2 lips could arouse such feelings in one. It was a euphoric feeling. It felt like his entire world was collapsing and rebuilding itself.

The sunrise, the sunset, a volcano exploded, the earth was torn open, lava rose up, butterflies flew over a flowerbed, eagles flew majestically through the sky, the red color of blood, the pink color of her eyes... he couldn't begin to describe everything he was feeling at the moment. Everything he had experienced so far in his life was nothing like it. Even his mother's hug hadn't triggered that many emotions in him.

His entire body reacted to these feelings and became hot. He didn't even notice his two red cat ears and tails appear. The kiss was supposed to be slow and gentle, but after just 3 seconds a switch had been flipped in Naruto. All of his troubled emotions from his life of seeking love and closeness to others outside of friendship just came out. In addition, he was a Nekoshō who liked to lose himself in such moments and only act instinctively.

Naruto's instincts rose to the surface, and he said clearly: he wants more and never wants to stop the kiss. Naruto tilted his head to the other side and kissed Mio again, and then again. Mio couldn't think clearly after all those minutes under the influence of the curse.

Just like Naruto, several supernovas exploded inside her. Her entire body heats up more than it already did due to the activation of the curse. Her heartbeat became faster by the second with each new kiss and her arms automatically found themselves around his neck. She didn't want to lose this feeling she was currently feeling. In addition to the security, the warmth and all the other things that she owed to Naruto, pleasure was also added.

Both moaned into the wild kiss and after 2 minutes both used their tongues. Naruto was the first to brush his tongue against Mio's lips before she opened her mouth, and he stuck his tongue right into her mouth.

Mio's natural reaction was to respond with her tongue. Naruto grabbed Mio's ass with one hand, which caused a strong reaction from her, and she moaned even louder into the kiss than before. Naruto massaged her ass with his hand and after a while slid his hand up and went under her top. They both stopped kissing briefly and as they did, Naruto pulled her top over her head and tossed it to the side. Mio had raised her arms so that the top could slide off her body more easily.

Naruto looked at Mio's massive breasts, which were now completely exposed. For whatever reason, Mio wasn't wearing a bra. Naruto didn't hesitate for long and didn't give Mio a chance to look away because her eyes widened, and her head looked towards the ceiling.

Naruto was currently sucking on one breast and his other hand was massaging the other. Naruto couldn't get enough of the taste, the feeling and her moans. It was just gasoline that only fueled his fire and kept him going.

One thing became immediately clear: Mio's breasts were her weak point. Naruto was only doing something instinctively at the moment, but he could still remember one thing.

"Every woman has some vulnerability outside of her vagina. For some it's their breasts, for others it's their armpits, for others it's their ass and other places. If you find this spot, you have taken a big step towards satisfying the woman. Concentrate on that spot and the woman will scream your name and make loud noises."

"AHHH!" screamed Mio. Naruto's tongue circled her nipple before he sucked on her breasts before he bites on her nipple lightly just to suck on her breasts again. His hand fondled her breasts, pinching her nipple with 2 fingers just to fondle them again. Naruto couldn't get enough of Mio's heavenly breasts. They were just perfect, and her voice was just the fuel that turned a little flame into an inferno inside of Naruto. The longer he attacked her breasts, the longer he wanted to suck and fondle them.

The way things were going it was no wonder that Mio was already on her second climax. She screamed and made the mattress under both of them wetter than before. She had already wet the mattress before hand with her first orgasm. While she was still riding out her second orgasm, Naruto never stopped with his assault of her breasts. He did exactly what he was supposed to do. He attacked the part of her body that was her weakness to get the most intense reactions from her.

Everything that could be heard over the next 20 minutes was Mio's screams and the bed both were on. In this time Mio came a few more times since she never really could calm down because of the curse and Naruto since he simply assaulted her breasts without stopping.

After 20 minutes were over, Mio's body began to glow slightly and the symbol around her neck glowed more intensely. Mio felt how her 11th orgasm rocked through her and that was the moment when she screamed louder than ever before while she held Naruto's head into her breasts.

Naruto got a bit of control back in his actions and stopped with his assault on her breasts. He could see Mio laying under him, breathing heavily. She panted hard and looked with a dreamy look at the ceiling. Her eyes were half open while the new oxygen in her body worked wonders. Her body calmed down a bit since the submission was successful and a success. Naruto had done it. He had subdued her and thus the curse was negated for now.

Naruto got wide eyes when he saw her state and that the curse was off. He turned around in a flash and stood up. "I'm sorry, I lost myself a bit," said Naruto while he stood with his back to Mio. Mio got a bit more control back before she sits up and said, "You don't need to apologize…" She was crimson red in the face when she thought about what just happened a few seconds ago. She never felt anything like this before and now that it was over… she was even a bit disappointed.

Naruto took Mio's top and gave it to her while he looked away. His face was also crimson red from the experience he had. This was by far the most intense experience in his entire life. His cat ears and tails vanished again before he looked behind him. He could see that Mio wore her top again.

"I am happy that you are back to normal," said Naruto with a nervous smile while his face was still red.

"Y-yeah…" said Mio while she looked at Naruto.

Naruto wanted to say something, but his face became serious when he heard that growl in his head again. He was at his window in a flash and looked up in the sky. He could see a massive shadow over the clouds before it shot into the distance and vanished. Naruto saw 2 massive claws from an unknown creature when the creature shot into the distance. Just from the size of the claws, he would guess that creature was as huge as Kurama. Even when it's dark outside, the full moon gave enough light that Naruto could see the giant shadow above the clouds.

"Naruto?" Mio saw his action and stood up from the bed. Her legs were still a bit weak and shaky, but she walked up to Naruto. She placed a hand on his shoulder, and he looked at her surprised.

"Huh?"

"Everything ok? You reacted so strangely and ran towards the window out of nowhere," said Mio.

"Sorry, I just heard a growl of something inside of my head. It happened a few hours ago too but this time I had seen what that thing was," said Naruto while he looked out of the window into the sky. "Just from the size of the thing I would say a dragon or something similar, but I could be wrong."

Naruto placed a hand on her head with a gentle smile, remembering his feelings he felt just 2 minutes ago. He knew it know… he loved Mio Gremory, and he was sure of it. Looking back, he had loved her longer than he first thought, it started even before the situation where he saved her from Viktor. He didn't know how Mio had sneaked her way into his heart, but it must have happened over the last 2 years while she was talking with him during the breaks at school.

"But don't worry, even a dragon can't rip us apart. I will be at your side for as long as I live," said Naruto. Mio got tears in her eyes again, launching herself at Naruto, locking lips with him. Naruto's eyes widened before he closed them and kissed Mio back gently while his arms found their way around her hips. Mio's arms were around Naruto's neck.

After a few seconds both broke the kiss and Mio said, "I will also be at your side forever, Naruto-kun."

This night both didn't left the room and slept together in the giant bed in Mio's room. Both had smiles on their faces while both held each other in a tight embrace. This was the first time Naruto felt really happy and complete in this world. The feeling of Mio at his side was just indescribable. He dreamed of a certain red-haired beauty that stole his heart.

"So, it is done, huh?" asked Jin while he smoked a cigarette. He looked up at the full moon and didn't have to wait long for an answer.

"Yes. Naruto Uzumaki and Mio Naruse are one. The master-servant pact was a success," said Chisato.

"I wonder how Sapphire will react to that… well I guess she won't do much about it. She will probably thank the boy because he took care of her niece when she couldn't because of her brother," said Jin.

"Have you already planed on how to explain everything to the boy?" asked Jin while he looked at Chisato.

Chisato didn't say anything for a minute before she said, "Yes. I will talk with him when he comes to me the next time. I will bind myself to him when the times come," said Chisato. She thought about the man that wouldn't go out of her head. Naruto Uzumaki was a special case. She was already living a long life and she saw the lives of many humans or other races. She had never in her long lifetime seen a soul and man like Naruto.

He did something with her that was normally impossible. Well… he already made the impossible possible more than just one time. She knew it… she had seen his life after all. She got something that normally was impossible for someone of the 10 God Clan. She got feeling for a mortal being. Well… now as Nekoshō he had a very long lifespan. He could technically be called immortal like most supernatural races when it comes to lifespan.

The point was that Chisato Hasegawa, one of the strongest beings in existence was in love with Naruto Uzumaki. She would do anything for Naruto and would devote her immortal life to him. She had already looked over the universe and the mortals enough. She had decided that she would live only for Naruto.

(A/N I hope you all enjoyed the 8th chapter. I wish you all the best and I would appreciate feedback as always! Have a nice day, always be careful and always try your best! I know that you all are going to make it! Stay strong folks!)