Ajuka's Lab, Underworld
Naruto with Miya teleported directly into Ajuka's lab where Naruto was called to test the proficiency of his Evil Pieces Set. Naruto knew the area well as he came here a few times.
Naruto and Miya are allowed in by the guards as they were ordered by their Master. Naruto walked in to see Ajuka scratching his head on something.
"Yo," said Naruto loudly. Ajuka was surprised and threw the liquid in his hand. Before Ajuka's magic could stop it, Shadows stood up and stopped the liquid from spilling on the ground.
"You shouldn't be careless, Ajuka," said Naruto as if chastising a child.
"I wouldn't be if it wasn't for your untimely intervention," said Ajuka. Naruto didn't change a bit from what he can remember of the blonde.
"So why did you call me here?" Asked Naruto. Ajuka put the liquid in a small cube and removed his lab wear and walked Naruto outside.
"We just found something interesting and I want someone to investigate it. I thought of all the possibilities and you came to mind. You have the necessary tools and can escape from anything as you merge with Shadows. So I want you to go on this" said Ajuka with a smile.
"What are we talking about here and why is it so difficult if you are asking me to do it in specific?" Asked Naruto. Ajuka was impressed by the blonde's foresight to ask everything.
"Well, there comes the problem. You see the thing we found is difficult to reach and was found in an unclaimed part of the Underworld. The place where we are trying to expand to facilitate the growing requirements.
We don't know who is in it and how they came there. The area is filled with holy magic and the ground there is...different. The whole area is closed off for the time being. I'm trying to investigate about that when you came" said Ajuka. They both walked into the lounge area where Miya was sitting.
Miya stood upon seeing Naruto with a green-haired man whom she assumed to be the Maou Beelzebub. She walked towards them and stood to Naruto's right waiting to be introduced.
"Who is this young lady, Naruto?" Asked Ajuka curiously.
"This is Miya-chan. She is my Knight" said Naruto, introducing Miya to Ajuka.
"It's an honour to meet you, Beelzebub-sama," said Miya with a courteous bow.
"All your peerage members seem to have exceptional discipline, Naruto," said Ajuka.
"Likewise, Miya-san. I'm sorry to disturb whatever you and Naruto are planning" apologized Ajuka.
"It's nothing like that. We are about to come to the Underworld anyway. Your call just made the place change, that's it" assured Miya in a respectful tone.
"That's better to hear. How is Kuoh, Naruto?" asked Ajuka jovially?
"Well, I guess. Rias and Sona are handfuls to handle, you know"
"Yes, yes. I've been seeing them since their childhood after all" agreed Ajuka.
"So, what is in it for me?" Asked Naruto. Pulling Ajuka out of his thoughts with that question.
'Damn him. What a cunning guy. Even before I could say anything, he just asked me what he would get in return. I guess it is how he works. After all, even before taking the King Piece, he asked what will he get in return' thought Ajuka.
"I don't have anything ready-made for you to give, Naruto. As always, say what's your price" said Ajuka.
"Well, after you mention that the area was filled with holy magic-"
"You want that?" Asked Ajuka excitedly.
"No, I want whatever causes that. I can't let you or other devils get your hands on that. You know how paranoid the Church is and if they find any Holy things with you, there will be potential war as the Church might assume you stole something from them" said Naruto.
Ajuka thought about it. From what he could gather, the soil and area were highly concentrated in Holy magic and they couldn't get a good grasp on it and the probes he sent picked a signal of some kind of strong weapon or artefact in them.
Ajuka completely agrees with Naruto as he knew how paranoid the church was and before Michael could even say wait, they'll declare war and attack them. In any way he saw it, what Naruto suggested seemed plausible for Ajuka.
The only thing left is to convince the Devil hierarchy which is not his work as he already pushed Sirzechs into doing that.
'Ah, the satisfaction,' thought Ajuka with a fond smile.
"Ok, Naruto. I agree with you. But you'll leave all the soil and other things which don't cause the effect there. Take whatever is causing it, Ok?" Asked Ajuka.
This is how far he is willing to bargain and Naruto thought for a second and agreed to the deal.