17 Training instructor 2

After Rias completed her weight-training, she laid on the ground, he thought it was funny that she did not look like an heiress from the underworld.

He approached her and gave her a bottle of water that he had taken from his inventory. When he began to enter his dimension, he was always hungry, so he had to leave many things in his inventory, nothing was damaged because time seemed to stop.

Yukio: "Well done, I'm surprised you managed to complete the round in one day." What he said was true when he started doing it,, he almost died of exhaustion.

Rías took the bottle of water with an angry look, she felt exhausted because of this barbaric training.

He did not care about her look, he shrugged before speaking with Grayfia.

Yukio: "Grayfia, I'm going to start the mana training," he hesitated a little, but spoke. "I'm going to use a skill to help her. Could you wait for a little?"

Grayfia was confused, she did not understand exactly what it meant, but she trusted Yukio, so she just smiled.

Yukio: "Have you rested enough? I need to start your mana training."

Rías: "You... Is that how you treat girls?" She was furious as soon as she caught her breath, but now she wants to start again.

Yukio: "Does that really matter? I have to go home soon." It was true after all it had been an hour since he left school and his parents would worry if he did not come back soon.

Rías: "Hummpf! Let's start" She snorted in anger, she couldn't stand this child, and she only met him twice in her life.

He approached near Rias placing his hand on her shoulder before she could react, a small white hole appeared that swallowed them both, he knew Grayfia would be worried so he left a few words behind. "Grayfia-san we'll be back soon!"

So they disappeared as if they had never been there, Grayfia was confused trying to feel their presences but it was as if they didn't exist.

Grayfia: "Yukio-kun... You should at least explain things to me before doing them *Sigh*" She rubbed her forehead while thinking about this child...

----

Meanwhile, Rías was trying to get up while she was kneeling on the floor, she couldn't even lift her head just listening to Yukio's voice.

Yukio: "You'll have to stop the pressure and concentrate on assimilating the manna in the air when you do that you can move again."

They moved to his dimension because when he was planning to create a house, he discovered a place where the manna was too intense at first, he got confused because there was such a place, after inspecting it he found a black hole.

He did not enter because he could feel presences with great power on the other side, so he left it for when he became stronger.

He sat on the ground while looking at Rias, he noticed she was stabilizing and assumed she was releasing her 'Destruction' after all in this place she didn't have to hold it in.

Rías: "W ... what is this place?" She asked, clenching her teeth trying to get up with all her might.

Yukio: "You could call it a special ability, you should concentrate on the training if you want to, I can explain it to you later."

Rias nodded, she wanted answers, but had to take advantage of training her mana in this place, she felt free to eject all her mana even her destructive power, she just managed to sit down and closed her eyes while trying to get used to the mana in the air.

After about thirty minutes she could get used to it, opened her eyes and began to check the place where she was, it was really beautiful, there were several herbs growing and a blue sky without clouds, having a black sun was strange but dazzling.

She fixed her gaze on the boy in front who was writing on a laptop and felt curious, she therefore approached him.

Rías: "What are you doing?" She watched and could understand that it was a kind of story, her eyes lit up as she continued reading "Is that a novel?"

She was impressed even though she was from the underworld, she still liked some human things.

Yukio: "You get used to it fast, that's good, let's start your mana training." He did not answer because he did not feel like telling her what he was doing, after all, he barely knew her to let her know what he was doing.

Rías clicked her tongue because he didn't respond, but she still nodded to start training, she had already realized that she could become strong if she followed this child's advice.

Yukio: "Sit down and try to gather mana around you, when you think it's enough take this pill, I advise you to move the mana through every part of your body".

Rias took the pill in her hands and reviewed it, it was the pill that his older brother had taught her before, so she knew its effects. She sat obediently and began to gather the mana around her.

To her surprise it was very easy, she felt that she could completely control her power of destruction, at least in this place where she felt free, she thought it was enough to quickly swallow the pill, she felt something warm explode in her abdomen when all the mana in the air was attracted to her in a typhoon, this was better than what her brother had said, they had only said that the demon managed to increase his mana by a third, but this was different, she felt that it would explode.

When it almost got out of control, she heard Yukio.

Yukio: "* Sigh * I will not let anything happen to you, you just concentrate on moving the mana to every part of your body, to help you absorb it."

Yukio treated her badly, but his words assured her that he will not let her get hurt, so she concentrated on doing what he said.

---

She spent almost an hour quickly and Rias was sweating all over her body with a pale face, she was mentally and physically powerless, almost on the verge of unconsciousness, but she bit her lip to hold on.

Yukio: "Well done, you have managed to absorb half of what you put together, I can say that you are now with enough mana, so rest and then try to control it, now you are not a time bomb anymore."

She nodded palely, was exhausted and just wanted to leave, she saw the boy walk to the front and showed her a pill. "Here, this pill will help you recover physically."

She swallowed it quickly and her body regained its color, but her state of mind was truly a disaster, even so she rose a bit staggeringly.

When he saw her like this, he hesitated a little but it was better to do it. "Do you want to become strong?"

Rías: "Strong? If not for that why I would be here", she replied tiredly.

Yukio: "No, I don't mean that, why do you want to become strong?"

Rías contemplated a moment but raised her head with determined eyes: "Because I want everyone to know me by my name, I do not want anyone to decide my destiny ... I do not want to be a puppet."

The last part she said in a low voice but he could hear it clearly, he smiled a little, then looked at her a little.

Rías: "What? Is there a problem with my ideas?"

Yukio: "Not at all... Do you want me to help you?"

She was confused, "Aren't you helping me right now?"

He shook his head as he looked at her again with serious eyes "I plan to help you become strong but for that... You must promise to keep a secret..."

Rías was speechless, she understood that he planned to help her for real, but it must be a method that he does not want anyone to know, so she felt something complex, on one hand, she had to lie to her family and on the other could fulfill her dreams.

Even so, she made a decision and to fulfill her dreams, she had to sacrifice something. Yukio did not show any bad intentions towards her, otherwise, she would have been killed as soon as they entered this place.

Rías: "I promise, I promise not to tell anyone about Sensei's methods."

He was a little stunned. Sensei? This is new but he soon chuckled as he pulled out a piece of writing paper that he had made when Rías was taking the pill.

Yukio: "This is a contract, here place your name along with your blood... You should read the consequences of breaking your word."

Rias took the paper and began to read it when it made her beautiful face turn pale, what was a contract called "Contract of the soul"? The clauses said that if she broke her word, she would die immediately and anyone with the slightest information due to her too.

Rías: "Se-sensei this...? Isn't it too much?"

Yukio: "Ah? Well, if you don't plan to betray me, nothing will happen to you. Why so much fear?"

Even if she did not plan to betray him, she still feared that by chance she would drop something and end up dying ... She still gritted her teeth and cut her finger and with her fingerprints in blood, signed the contract.

He smiled at her when he saw her do that, that paper was not really a contract, it was just a simple sheet ... He cheated her, but how could he tell her he had techniques, even if they were not against him, then what? What would happen if he told her that he can strengthen her? How to make sure they would not take something away from him?

He saw her shaking and thought he exaggerated a little but still took the contract and stored it in his inventory.

Yukio: "Hey you shouldn't be like this, it's not like I'm going to kill you now."

Rías: "You say it so easy! I could die if I happen to slip something!"

Yukio: "Hehe but you wouldn't do it, would you?"

Rías was furious and clenched her pretty teeth in anger, staring at him like a beast.

Yukio: "Don´t get mad, come on, I'll show you the method." He approached her and placed his finger on her forehead to convey a technique, he bought at the store.

[Mana Control] — Ability that allows the wearer better control over the mana in his/her body.

Rías felt a lot of information in her mind and along with the previous tiredness, could not bear it anymore and collapse.

He took her quickly in his arms, he knew she was tired and it was time to return. A white hole was opened, swallowing them again appearing in the same place, he had Rías in his arms unconscious.

Grayfia was getting worried but soon a white hole sparkled and appeared again but this time Rías was unconscious in Yukio's arms, she raised an eyebrow before the child.

He innocently smiled at her gaze, "In my defense, she just fainted."

Grayfia: "You don't have to worry Yukio-sama" she took Rías in her arms and gave him an inspection and was surprised to see that his mana increased from a simple house to a medium-sized building.

Yukio: "I'll go Grayfia-san... don't forget our deal." He started running.

Grayfia looked at the boy's back and smiled and really felt like he was like a son, meanwhile, Yukio only had one thing on his mind.

Yukio: "My parents are going to kill me…"

Editor: maave