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~~~~~~Underworld~~~~~~

"I see... so, this genius teenager managed to summon Serafall to be his contractor. And she is obligated to not tell anything about his work which is part of the deal." Sirzechs reviewed the file report with a thoughtful look.

He was thinking about how to keep the deal going while profiting from it himself. If what his queen said is true then the devil kind will benefit from this, imnsely.

"And Serafall wanted to make him her queen but he declined?" Sirzechs asked as he wanted to double-check on the most important part.

"Indeed, he is sowhat prejudiced towards the whole evil pieces sche." The silver-haired devil lady confird with a nod.

"I see... well it doesn't matter he might change his mind when he gets much older."

'Then he will just find a way to get eternal life... I already told you how dangerously smart he is!' Grayfia internally seethed with anger as Sirzechs doesn't seem to understand how lethal Marcus truly is!

This is quite literally, what happened with the original Lucifer! He was glossing over the threat of Solomon just because he is human and look what happened? They nearly got conquered by the very sa man! Alone! A lone human marched to their world, picked up so devil ladies and left like he owned the place!

"As you wish. I have fulfilled the mission you requested of ." Grayfia said that with a small bow.

"Yes. Now I need to contact Serafall and request one of those... signers for myself."

"I suggest we contact him through her. It would be best if he doesn't get the idea that Serafall has failed on her side, but instead, you have picked up on her increased productivity and want the sa thing." Sirzechs' Queen suggested what Marcus had just told her through the ntal connection they share.

"Exactly my thoughts..."

Sirzechs smiled at the idea of doing less paperwork and at the sa ti allowing Serafall to keep her contract with this genius human inventor.

He has no idea how the teenager managed to summon a Satan of all people but if he can do that then his potential is noteworthy.

The Crimson Lucifer decided to keep a note on this human for future recruitnt while Grayfia kept her poker face, she tried to fight her bindings... well... trying is the wrong choice of words. As soon as she even had the idea of fighting her bindings, the mont that idea cos up, she forgets about it.

The power of Ars Goetia or whatever subspecies of it is simply too powerful, especially towards her very being. As Serafall had said to her, the maids' bindings are even stronger as she is from a house that was a direct Lucifer servant. Making her have an even stronger connection to Ars Goetia...

~~~~~~Back in the 'Garage'~~~~~~

"Did you just say that Grayfia was added to the fold!?" Venelana's knees gave up as she collapsed onto the couch.

A mber of her family just got added into this ss! She quickly realised that the pillars are quite literally the sa as Lucifer's aning that the Gremory pillar is still empty and Marcus can just up and summon either her son who is the leader of their race. Basically making him the de-facto ruler of the Underworld or summoning her baby daughter. Both of these ideas simply terrified her.

"Yes. Turns out she has been tracking my movent for months. The Diamond Core Heart has been masking for months from her. Which is amazing, to say the least."

The brown-haired devil lady slowly nodded. She instantly rembered the beautiful diamond the size of a basketball downstairs and then thought about sothing like this being installed in Kuoh to protect her daughter. But how should she approach this?

So sort of deal? Money? She instantly snorted at the idea of cash for soone who can make jewellery from clay...

Possible magic information exchange? But he can simply ask her anything and she will tell him either way!

Then she started thinking of it from a different perspective! What if he visits Japan? Kuoh specifically? Since it is devil territory, they have living targets like stray devils appear there much more often.

In the end, she decided. Since he is an inventor and researcher at heart he will be interested in more 'data'...

"Lady Leviathan..."

"Call Serafall... we are pretty much connected for life..." the black-haired devil lady sighed as she was reading a book on cars of all things...

"Then Serafall. Now that Sona and Rias will be attending school in the human world. You haven't thought about asking our Master to install sothing like a Diamond Core Heart in Kuoh?" Venelana asked the Leviathan.

"I did the mont he got it installed and saw its incredible effects. We knew the very mont Grayfia was in the city. Where she thought she was tracking us, we were actually tracking her... its most advanced territory surveillance magic I have ever seen.

So, yes. I have been thinking about it for weeks now." She sighed.

"We could easily get him to Japan as a field expedition. But to install another Diamond Core Heart? That would be impossible because there is nothing of worth for him there." Serafall said with another sigh.

"We could simply tell him that he can leave one for the sake of collecting data," Venelana said with a thoughtful shrug.

"...That...might just work...I will ask him after one of our sessions." Serafall said that with a lewd smile.

"Good... the more interest he has in Kouh, the better it will be for our family over there."

"Indeed, have you thought about asking for his help in that marriage contract Rias is stuck in?" The Leviathan asked with raised eyebrows.

"No... I have not. I hope Rias will think of sothing now that she is moving to the human world." Venelana said with a sigh.

Serafall didn't say anything, but she had the look of soone who doesn't quite believe that Rias will do anything at all. The girl was just simply running away unlike her baby sister who is just going there for field experience.

Nonetheless, it's not her business. She will try to help Sona if she can. But her priority is to make sure Marcus doesn't think of the devils as enemies.

"Ti will tell."

~~~~~~Marcus~~~~~~

Now that Grayfia is in place, I can breathe a sigh of relief. With her there I will know exactly what Lucifer himself is doing.

This incident was a close call. Reminding that I should have so ans to defend myself and go on the offence if need be.

That's why the mont she was gone I dived back in to continue my work on the guns.

All that was left was the gun designs itself, the Glock design was quickly thrown out of the window since the circles aren't going to fit. That's why I went with hand cannons.

A slightly bigger and bulkier version of the Desert Eagle for the right and a slightly more slender and sleek one for the left.

After all, they were Castor and Pollux.

And since Pollux is female, the design on the left is slightly on the slender side, which in turn makes the barrel shorter. And since my left hand is less used, I am planning on using the scatter mode much more than on my main hand.

The guns themselves had inscriptions of stars on them. On the side of the barrels, there were carvings of stars and wind. Implying that the stars will show the way... to target graves.

While the design is done I won't be using them just yet. Instead, I went with sothing much more plain-looking.

It was ti to test. Since I had the feeling that I won't be able to use them as it is. The recoil will be considerable.

A few minutes later the creation of the pair of guns was done, one of the perks of having an assembly line, the downside however is the need to constantly update and upgrade but in the end, it is worth it.

"Is this it?"

"Yeah, Castor and Pollux."

"You nad them after Greek twins? I wonder what they would think if they found out that there is a Pseudo Sacred Gear nad after them." Serafall chuckled saying that.

"No idea, I nad the first gun after the word 'cast' as in casting magic bullets, thus 'Castor' but then I realised that I was making a weapon just for one hand so I decided to make another one and rembering the Gemini Twins, Castor and Pollux, I nad the other gun 'Pollux'." I explained to her how the nas ca to be.

"I see... I would have never guessed that the na ca to be from such a simple naming term." The black-haired Satan said with a fascinated look.

"Well it ca up naturally so... I am sticking with it. I have no idea how the Greek Pantheon will react to this. Not that I care." I shrugged at her before picking up Castor with my hand.

A frown appeared on my face. Even after using an experintal tal alloy combination, the gun was still quite heavy. As heavy as the original mark II.

aning that yes, the alloy made the weapon lighter but the size difference made the weight difference nonexistent.

Now the problem was the recoil. That's why I needed to test it so that I can move on to the ways of fixing the issue with said recoil.

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