Training instructor

The moment he entered his room, he only wanted to sleep peacefully, he was getting tired but just as he entered, he heard a voice.

Grayfia: "Yukio-Sama"

There was a flash and a circle on the floor when Grayfia appeared next with a little girl with red hair and blue eyes, he knew who this girl was.

Grayfia: "I'm sorry for the inconvenience. Yukio-sama, can we talk a little?"

Yukio: "You really do not bother me Grayfia-san, you came at a good time, I wanted to ask you something."

Grayfia: "I'm glad to hear that. What do you need?"

Yukio: "We can talk about it later, what do you need to talk to me about?" He could tell the little girl was hiding behind Grayfia but he didn't think she was shy... -She doesn't trust me?-

Grayfia: "It's a small favor from King Lucifer, we would like to get some pills that you gave me the last time, clearly it will not be for free, you can ask us for any price ... We also wish you could train this little girl here." Grayfia knew that this child was really strong without backup, he had to have methods to be so formidable being just a human besides his age of only seven years.

He knew that soon they would come to ask him for pills, for that reason he had given it to them from the beginning, at first he wanted to ask for something from the underworld that might interest him but after thinking about it a little bit he came to a conclusion.

Yukio: "Mm, I only have three pills in my possession, apart from selling them I'd like to ask you for a favor."

Grayfia spent some time watching this child, and she knew he was not telling the truth, but receiving three pills was more than enough for now.

Grayfia: "Well, what kind of favor?"

Yukio: "It's not much... I just want to get into the underworld."

There was silence until the girl hiding behind her spoke.

Rias: "Impossible! We won't allow a human to come to our home."

He was speechless, well he knew it would be like that, it's basically bringing an enemy to your house where your wife and son live.

Grayfia: "What exactly do you want to do there?"

He wasn't going to lie to her, anyway if he let them take him, for sure they would follow him to know what he would be doing "I just want to find someone, I promise I won't do anything against the Gremorys..."

Rias frowned. She was a little girl, but she knew what those words meant.

Rias: "You promise not to do anything against the Gremorys... But that's not including the other families!"

Yukio: "What happens to other families should not be so important to you," he got a little angry, he needed to go to the underworld and had no way to get there. "I'm not going to fight any family, my only intention is to meet someone."

Grayfia: "May I know what person you are looking for? I could help you."

Yukio: "Nekomatas, two sisters, I just need you to send me and then bring me back. Is that possible?"

Grayfia: "Could you wait for me to talk to King Lucifer about it?"

He agreed that this needed time, he really wanted to ask her to find them, but it would be very problematic to explain why to find them.

Grayfia: "In that case, I'll discuss it when I get back, about what I asked for..."

Yukio: "Training her, I do not know exactly what you're looking for but I'm not good at that, although if you really want me to do it, there's no problem."

Rias frowned at his response, she did not like the way he answered, but she kept quiet and had already been told that she had to make friends with this child in front of her.

Since he met Grayfia he was afraid but now he really wasn't, he had noticed a change and knew they wouldn't attack him, at least not for now.

Yukio: "I will train her when you receive the answer about my deal."

Grayfia nodded and disappeared into the circle, he could see Rias looking at him, he guessed she did not like it.

Yukio: "*Sigh*" he took a long sigh and laid down in his bed "I would have liked to avoid so many problems." So he fell asleep.

---

The morning arrived and quickly he went to the academy, today he wanted to give the pendant to Irina as it was almost time for her to go to England, he waited until noon where they left for a secluded place.

Irina: "Yukio-kun what's wrong with you?" He did not answer and took the pendant out of his pocket as he put it in front with a smile on his face.

Irina: "That?.... For me?" She totally blushed.

Yukio: "If it's not for you, who else would it be for?"

Irina: "Hehehe, it's very nice, can I have it?"

Yukio: "It's yours, could you turn around?" He approached and gently placed the pendant on her neck while leaving a simple short phrase near her ear.

Yukio: "You look beautiful Irina-chan."

He could see her as red as a tomato, he could not help but laugh when he saw her like that and took her hand to go back to class.

He felt happy after giving her that pendant. It had a passive ability to protect her. And that's what he most wanted.

---

He had left class and was thinking about going home, at least that was until he felt Grayfia's presence and knew she was trying to call him, so he followed her direction and quickly reached an alley where she was with Rias.

Yukio: "Why didn't you wait for me to come home?" He was confused by her act of calling him here.

Grayfia: "I wanted to but since the pills were known they have been trying to find out the whereabouts of the creator, so I had to move away from your residence..."

-So it turned out to be a double-edged sword ... - Well, he did not really care. He knew Grayfia would not let them hurt him.

Yukio: "I see so?"

Grayfia: "Yukio-sama you can enter the underworld, but King Lucifer asks you to be discreet and diminish your aura at all times, we do not want problems."

He knew what they were referring to and nodded, it was enough for him to enter the underworld, in order to discover the position of the Nekomata sisters although he already had a way of finding them.

Yukio: "In that case, I will give you the pills the moment I go to the underworld I hope you understand, for now, follow me to train her."

Grayfia did not care. She knew that a deal must be made when the parties receive their articles.

---

They arrived at a desolate place, it was practically a mountain, he didn't want to go very far because he needed to return home soon.

Yukio: "First of all, will you introduce yourself?"

Suddenly the little girl remembered that she hadn't even introduced herself before she took a step forward while giving an elegant bow.

Rias: "My name is Rias Gremory, heiress of the Gremory clan."

Yukio: "Well, your rank is a low-class demon. Are your heirs so weak?" It wasn't that he despised her, it was that in the series this girl was quite annoying to him, despite her strength she was always so weak.

He saw her bite her lips and look at him conflictively.

Yukio: "You don't have to look at me like that, you're here to train and at least I'll help you a little, but don't think I'll make it easy just because you're an heiress... Grayfia-san I hope you understand."

Grayfia: "I will not interfere with your training."

Rias: "What kind of training will we do in a place like this?"

Yukio: "For now we will only strengthen your mana, I would like you to train your physique the also, start with gravity weights."

Rias got confused. Gravity weights? What's that? Grayfia was the same but stayed away.

He took four bands out of his inventory and put two on the little dolls with the rest on their calves.

Yukio: "For now you will train with only 2% of normal gravity, your training will be to run ten laps for now, and then we will increase your mana."

Rias: "2% gravity. What exactly are you talking about?"

Yukio: "Don't worry, start running now."

Rias looked at Grayfia who nodded and without anything else she began to run, her normal routine was about 50 m touching the ground with her hand then returning to the starting point repeating the same action at least until Yukio spoke the magic words.

Soon Rias felt that her arms and legs were gaining weight making her slower, having to make an effort to take action, she felt incredulous and had to endure the pressure that made her want to kneel.

He smiled maliciously, it wasn't that he didn't like her, he had to admit that Rias was impressive in many styles, but he hated the part where being strong was so useless, so he wanted to temper her temperament and give her the strength to respond.

He looked at Grayfia who saw Rias from afar and it seemed that she was really not going to interfere, and she smiled at him when she saw that he was looking at her, he did not know, but when he saw her, he felt a very strange feeling.

It was not that he loved her, but it was not friendship either, he returned her smile.

He realized that Rias was taking faster steps, she adapted very quickly, so he would let her get used to it before the gravity continued to increase.

For now, there was something in his mind that he needed to do.

"Kuroka ..."

Because she killed that scum, she lived a life in which she had to escape and suffer just to be able to save her sister, this time he will not let her suffer.

"I will save you, just wait a little longer."

Editor: maave