Absolute Territory.
No, that wasn't the name of the ultimate technique; instead, in his country, it was a term used toward the exposed thigh area between the short skirt and the thigh-high socks, which was often called the Zettai Ryouki, or in English known as the Absolute Territory.
As for why Sato mentioned this terminology, it wasn't because he wanted to explain his fetish.
Thighs were nice, but the beauty that he sought was beyond human understanding.
Yes, what he sought after was that part that was only understood by a cultured man.
Yet, what he wanted to say was that—
"STOP DRESSING UP LIKE A WOMAN! ALSO, WHY THE HELL DID YOU STYLE YOUR THIGH AREA IN THE ZETTAI RYOUIKI?! YOU MIGHT BE CUTE, BUT THERE ARE SOME THINGS THAT YOU SHOULD DO AND SHOULDN'T DO!"
However, even if Issei was completely made, trying to make Gasper into a manly man, the guy was at a loss for a while and asked timidly, "...am-am I not cute?"
"W-Well... you are."
"....."
Sato, who was silent, decided to step back.
"W-Wait, Sensei! I am not like that! I like women! I love them! I am a man who wants to become a harem king! I won't be interested in a strange area!"
"...I will believe it for now."
Sato knew the story of DxD, so he understood Issei's personality and taste.
Instead of Gasper, Issei loved boobs more. He could probably even eat three bowls of rice while watching a boobs video.
Boobs were Issei's oxygen, so what Sato was afraid of definitely didn't happen.
"....." Issei.
"Well, Gasper, can I call you that?" Sato asked as he looked at Gasper.
"Ah, um, yes." Gasper was a bit nervous, but Sato was different from Issei since it felt strangely comfortable in Sato's presence.
As for why it happened, it was probably due to Sato's Twice Critical, as he had been trying to double anything, including something that couldn't be seen by the eyes, such as emotions, which included a comfortable mood, a temperament, etc.
Still, as those things couldn't be seen by eye, he wasn't sure whether they worked or not, but he had to say, he felt conflicted toward this character, Gasper Vladi, especially when it was on the afterstory or spin-off instead of maintaining this character of his and appearance, Gasper became a macho guy that was full of muscles like a certain robot from the future whose line was, "I'll be back!"
Even so—
"Wait, Sensei!"
"Hmm?"
When Sato was about to tell him everything, Issei suddenly interrupted him. "I know that you can't believe in me, but please let me be the one who tells him everything."
"Do you want to do this, Issei?"
"Yes!" Issei nodded with a determined expression. "Let me do this, Sensei!"
"Okay, go ahead. I will go back now."
After Sato said that, he simply vanished, leaving Issei and Gasper alone in the room, and as expected, when they were alone, Gasper quickly retreated back as he was frightened and nervous. "Y-You won't eat me, r-right...?"
"..." Issei.
Still, as for what had happened between Issei and Gasper, Sato didn't care much; instead, he could only sigh, thinking of Gasper's Sacred Gear, Forbidden Valor View, which gave him the ability to stop time.
'A time manipulation...'
However, even so, like what Sato had said before, even if a certain power seemed broken, out of the chart, and they seemed to exist like a cheat player on the game, if their opponents were powerful enough, they could break away from the effect, whether it was the Power of Destruction or a time manipulation, there was a way to defeat it.
Yet, could it be done with his Twice Critical?
While Sato was fine with his Twice Critical, if possible, he wanted a more powerful Sacred Gear, or, if possible, for it to evolve, or have other secret powers.
Still, fortunately, he had awakened his new ability, which made him able to grow stronger with his other self, giving him a stronger chance to grow even stronger.
Yes, he was tempted to summon the 5th, 6th, and more Sato, but the more Sato there were, the more energy he needed to use, so whether he wanted to or not, he had to wait.
So, what was his problem?
Wasn't he strong enough?
Hahaha...
He could only laugh, especially when he thought of the last opponent that would appear in the world of DxD.
Regardless, he could only do his best, as there was nothing else he could do.
So, at that moment, he gave his all, but as expected, while he was full of spirit in the beginning, he grew tired at the end, and he naturally rested, as he tried many ways with his new ability that he gained from the devil previously.
Oh, right, he hadn't explained it before, but he could change places with all of his doubles.
As long as he left his double in a certain place, he could directly move into that double, changing places with his double even if he was in Alaska.
Frankly, this wasn't a new move, and he had developed it before, but he hardly used it, as it was meaningless to run away from Rias and Sona, who had powerful siblings, whose might could even destroy the planet.
Even if he ran away to the corner of the planet, if the planet itself was gone, he would die, okay?
Regardless, while he gave his all in training, whether it was Kiba, Koneko, Akeno, or Rias, they also gave their all, trying to get stronger, especially Akeno and Rias, whose powers were felt from time to time in the area.
If Grayfia wasn't around and built a barrier, many people would have come due to the commotion already.
Still, Rias had given her everything, so naturally, she wished to get a reward from her lover.
Sleeping together should be okay, right?
As she thought so, when everyone was exhausted and slept at night, she slipped away from her room to enter Sato's room, but—
"Go back and sleep, Rias."
Grayfia was there, staring at Rias with a stern and cold expression.
"....."
"...yes."
Rias could only sulkily return since no matter how many complaints she had, she was obedient toward Grayfia.
Yet, she ignored many strange facts that happened before her.
"...but, what was that smell?"
Rias felt strangely attracted by the unique, strange scent that exuded from Grayfia.
Only, as Rias left, Grayfia let out a sigh of relief before she closed the door of Sato's room once again as she used a sleeping magic to make everyone sleep comfortably after a hard training on the day, helping them to rest, and definitely wasn't because of something else.
Still, without a doubt, Sato was glad that he had grown a bit stronger since. Yet, as the slurping voice continued, he wondered how long he could control the monster that was about to run amok within him.