"That said, Rias." Sirzechs looked at Rias and said, "You should go back to the Underworld for a bit."
"Huh? Why?!" Rias didn't care even if Grayfia kept scolding her, as she was in a good mood since her engagement was successful, and she would become Sato's fiancée.
As for the surprise that he was a descendant of Asmodeus, while it surprised her, it didn't change much of her impression towards him, as she knew that he was impressive and amazing, but without a doubt, the fact that he was the descendant of the Four Old Satans, or simply a devil, was a plus point for her since that way, no one could deny their marriage!
Or rather, as Rias wasn't an idiot, she could imagine that all of her family would definitely support this marriage!
"You need to finish the withdrawal procedure for the engagement and make your engagement legal in front of the devil, so that way, no one will steal him."
Sirzech's words might seem strange, but as Sato showed his twelve wings, all the devils who happened to watch the Rating Game between Riser and Rias knew that they had to get his seeds!
At this moment, there would be a fight over who would become his wife, especially when Sato's potential was unlimited, and he also possessed a mutated Sacred Gear that no one knew.
Sato might say that it was the Twice Critical, but no one believed it, especially when it could help him to increase his strength so many times.
If Issei wasn't around, then everyone would think that Sato was the holder of the Boosted Gear.
Still, there was also that ability to absorb the flames and return them to Riser.
Frankly, there were many things that they didn't know about Sato, but they also understood that he also didn't know many things about him, since, as he had always said, his background was so ordinary, it was so ordinary that all of those who could get a hold of his data wondered whether everything was just a fabrication.
"...." Sato.
Yet, this fabrication also obviously had a reason, which was to protect Sato, the last descendant of Asmodeus.
"..." Sato.
While he wasn't sure what was on the heads of everyone, Sato asked, "Should I go with Rias?"
Yup, he didn't use "-sama" anymore, as their relationship was obvious.
"No, no. It's fine. If you go there, everything will be chaotic."
In other words, let's just leave everything to Sirzechs.
As Sato was about to marry Rias, it was obvious that Sirzechs could help resolve his problem, and frankly, Sato also knew that he was being used, but it didn't really matter to him, as in exchange, he also gained Sirzechs's protection.
To have the protection of the strongest devil in the entire world, wasn't it the best course for his life?
Still, at the same time, Sato could access everything that was owned by Sirzechs, as this guy was generous.
So, as long as someone took his interest, like his little sister, Sirzechs would do anything to get them.
Yup, Sirzechs wasn't a good person, but wasn't it normal, or rather, what did everyone expect?
Sirzech is a devil, after all.
"Is it?"
"It is."
"But..." Sato looked at Sirzechs and asked, "Can I ask a question?"
"Oh?" Sirzechs looked at Rias, then said, "Can you let your servants leave us here, Rias?"
"Ah?"
"Can Rias stay, too?"
"Okay."
Still, with Sirzechs and Grayfia, whether it was Akeno, Koneko, Kiba, or even Gasper, they had been submissive, and frankly, they wanted to leave, as they felt like they were being suffocated in this room, so when they heard that they could leave, they immediately bowed their heads and left.
As for what their conversation was about, they didn't care at all, as long as Sato was fine, they were okay.
Still, it made them feel a little conflicted by how Sato and Rias would have their engagement, yet... for Koneko, Akeno, and Kiba, they wanted to look forward to it.
"....." Sato.
Gasper looked at everyone's reaction before he also looked at Sato.
"...." Sato.
Regardless, as everyone had left, Grafyia made a barrier, so no one would be able to hear their conversation. As Sirzechs asked a question, "So, what did you want to ask, Sato-kun?"
Rias stayed by Sato's question, looking at him curiously, wondering what he wanted to ask.
"Why did Riser suddenly grow stronger? Did he use something to do it?"
"....."
"Huh?!"
While Rias was clueless and even exclaimed in surprise, Sirzechs smiled and asked, "As expected, you must have noticed it."
"Yes."
"Onii-sama, what does it mean?!"
Sirzechs shook his head as he saw Rias' reaction. "You are still young, Rias."
"Huh?"
"On the other hand, Sato-kun seems so calm even if he knew that Riser-kun had cheated."
"Huh, Riser had cheated?!"
As Rias was surprised, Sato was as calm as ever. "Well, I am the winner, after all."
"Hahahaha...." Sirzechs laughed. "Yup, he is such a loser to lose despite having to cheat~!"
After having to cheat and gain an incredible power, Riser lost.
If Riser wasn't a loser, then what was he?
"Ah, don't worry. I will make sure that Riser-kun and his family pay for what they have done to you."
"Thank you, Sir—"
"Onii-sama."
"....." Sato.
"Call me Onii-sama, or Onii-chan, if you want to."
"..." Sato.
As expected, this guy is weird!
"Onii-sama, please explain!"
Yet, Rias, who heard that Riser had cheated, couldn't stay calm and looked at her older brother with impatience and anger, when she knew that bastard, who had almost killed them, had cheated?!
If she could maintain her calm, as Sato was hurt in the process too, then what kind of fiancée would she be?!
She would definitely make them pay for what they had done!
"King Piece."
"Huh?"
"He used a King Piece."
"....." Rias.
Yup, Sirzech, who had known Rias for so long, just answered her question casually.
"...K-King Piece?!"
"Yup, it's like those Queen, Bishop, Knight, Rook, and Pawn in the Evil Pieces, while it isn't known publicly, there was something known as the King Piece, which could enhance the power of the devil tens to hundreds of times, making them able to reach the Ultimate Class Devil or even the Satan Class."
There was no need to hide anymore, as everything was clear; it was better to explain everything, but Sirzechs looked at Sato and asked kindly, "Do you want one, Sato-kun~?"
Yup, as Sato had become his brother-in-law, Sirzechs would take care of him well~!