The Hero Became The Son of The Demon Queen

"Even so, isn't it too much that you haven't left your room all day, making your subordinates work while you have sex?"

"…I'm really sorry."
"I really don't know what you would do without me."
"That's right, thanks to you, I'm working comfortably. I'm always grateful."
"…Here are the materials."
"Hmm."
He unfolded the documents handed over by his subordinate.
Information gathered over six years was organized within.
The seven countries that existed on the continent. Information about the important figures of each country. And the governing structure and current situation, the whereabouts of the revenge targets, including the former hero's party, etc. It was exactly the information he wanted.
There was no information on the military strength, such as how many knights, how many mages, and how many soldiers there were. That kind of information was enough to check after two years. What he needed for his plan to destroy the continent from within was information about "people."
"Excellent, as expected of Irena."
At his words, Irena slightly lifted the end of her glasses with her left hand.
"Don't mention it. This is only natural as your direct subordinate, young master."
There was a small smile on her face, which at first glance seemed indifferent. And when she lifted her glasses just now, her hand was dyed red. It was proof that Irena was embarrassed or happy.
'Looks like she's in a good mood. She's so tsundere.'
He looked away from the documents and at Irena.
Her purple hair, characteristic of succubi. Neat bob cut. Glasses that made her look pedantic. A cold impression. And the neat suit unique to demons. A woman with a cool personality and intellectual side, who looked like a secretary at first glance.
Irena, his first direct subordinate and second lover, was such a woman.
"As I said this morning, I'm taking you with me on this mission."
"I know that, but wouldn't it be difficult for me to stay close?"
Even among demons, succubi were particularly wary of humans. Unlike him, who was a demon hybrid, her purple hair would surely attract knights and mages to capture her if she just walked down the street.
"That's why you'll have to wait at the hideout."
"So I'll be the relay point."
He would have to contact this side regularly because of the Demon Queen, but he couldn't directly contact them while undercover. However, if they used a relay, it was possible to communicate reasonably well occasionally.
"But if it's a hideout…"
"I have a few places I made when I was a hero. They should still be there if nothing happened."
"I see."
Irena was one of the few people who knew that he was the reincarnated hero. There was the fact that she had been his nanny, but knowing about his reincarnation was a plus in making her his direct subordinate.
"When will we depart?"
"Tomorrow morning."
"Then please go in and sleep now. It's already late."
At her words, he turned his head slightly and looked at the clock.
It was definitely a little late to be awake. It seemed that the problem was that he had spent more than 12 hours in the bedroom with the Demon Queen.
"But the Demon Queen is still sleeping in my bed, right?"
"…Then come to my room."
Irena, embarrassed but honestly tempting him. A smile spread across his face.
"That sounds good."
He grabbed Irena's hand, which was flushed red, and headed towards her bedroom.
The servants of the Demon Lord's castle, whom they encountered as they passed through the corridor, all covered their mouths with one hand and whispered, "Oh my, oh my." There was no one who didn't know that the two of them were lovers, and that the end of the corridor was Irena's bedroom.
A man pulling a woman's hand in the dead of night and heading towards her room. It was a situation that female servants would like.
As soon as they arrived in the room, he roughly threw Irena onto the bed.
"Kyaa!"
Irena let out a cute scream as she fell onto the bed. The faint smile on her face showed that she was enjoying this situation.
The man's hands roughly tore at her clothes.
"Aah, Aaah…♥"
With just a few gestures, Irena was left with only her underwear.
He smiled and brought his hand to her lower abdomen.
Squish…

Her briefs were so soaked that he wondered if they were really underwear. If they hadn't been together all this time, he would have suspected that she had spilled water on them at some point.
"Why is it so wet here?"
"Aah♡ Y, you said you would bestow your grace upon this poor succubus… I was preparing in advance… Aah!"
It was something completely different from her usual cool expression, something lewd and depraved.
However, knowing well that this was her charm, he grinned and slapped her vulva with a flick of his wrist.
"Ugh…!"
"Who told you to prepare on your own?"
"S..sorry-…"
Irena apologized in a slurred voice. But her face wasn't that of someone who was truly sorry. It was an expression that seemed to want him to punish her more.
It was an expression he had always seen, but he never got used to it. Of course, in a good way. Every time he saw it, excitement ran up his spine.
He flicked his wrist again. This time, with four fingers including his pinky, he aimed precisely at her clitoris.
Smack!
"Kyaah…♥"
It sounded like it would hurt, but Irena came lightly with just that one hit. Her head tilted back, and her body trembled.
"You'll be punished if you get your pussy wet without permission again."
"Yes, yes-uungh…"
"So, what should you do now?"
At his words, Irena, still trembling from the aftereffects of her climax, slowly moved her arms and legs.
She folded her legs into an M-shape on the bed and pushed her panties aside with her left hand. Her remaining hand, neatly trimmed according to her master's preference, rummaged through her wet pubic hair and found her hole.
Her white, slender fingers wrinkled with love juice as she spread her vulva wide open so that her vagina could be seen.
"Eu, this lewdly wet succubus pussy… please pound it with your cock, Master♥"
It was indeed a phrase befitting a succubus who had even taught the Demon Queen slang.
"I'll pound the pussy of this poor succubus fuck toy! Cum with your master's dick!!"
He muttered words that he couldn't get used to no matter how many times he said them, and as she wished, he moved his hips with all his might and thrust his enraged penis towards her hole.
"Ughh──♥♥"
That night, the sound of flesh colliding and the woman's moans leaking through the poorly closed door kept all the servants with nearby bedrooms tossing and turning, unable to sleep.
"…My body is stiff."
"I told you not to overdo it."
"But you'll be busy from now on, so when will you have time for me again?"
Irena pouted slightly and buried her face in the pillow.
"Haha, Irena is really the most honest in bed. Well, the most honest one is…"
The prince swallowed the rest of his sentence with a sly smile. She wasn't stupid enough not to know what the hidden words were.
"…What can I do, I was born with this kind of personality."
She was born with an introverted and cold personality. As a result, even though she was a succubus who had to seduce men, she hadn't been able to achieve proper results in that area.
However, her intelligence and magical talent were outstanding, so she was able to work as the administrator of the Demon Lord's castle.
Thanks to her work as an administrator, she had survived the last war and been promoted to fill the vacancy. After that, she became the one and only nanny in charge of the Demon Queen's son, and now she was his direct subordinate.
As a result, she had fallen for the man she had raised like a son and was living a satisfying life.
"I wasn't teasing you, so don't be sulky. I find both sides of Irena cute."
"Ugh, th, thank you…"
Feeling better, Irena lifted her head and looked at the man sitting next to her, who was her lord, master, lover, and son all at the same time.
She had been horrified when she found out that his true identity was the hero, but now that didn't matter at all. No, it was rather a good thing for the Demon Lord's army. As she felt it, his desire for revenge was real.
The worst enemy of the past had become the best ally of the present.
He was no longer half-human, but his monstrous talent and strength remained the same. He looked like an ordinary boy on the outside. However, even though he hadn't become an adult yet, he had defeated even the Four Heavenly Kings in a one-on-one fight. That had happened just a year ago. Since then, the only one in the Demon Lord's army who could defeat him, who had become even stronger, was the Demon Queen in her prime.
In other words, he was currently the strongest demon in the Demon Lord's castle.
If he continued like this and became an adult in two years, how strong would he become? She shuddered just thinking about it.
"There's still some time before breakfast, so get some sleep."
"Ah, yes."
Her eyes closed at his warm voice.
His good points weren't just as a fighting force of the Demon Lord's army.
He was also very excellent as the next Demon King.
First of all, he had leadership and charisma. As he gradually became more like his past self as a hero through his awakenings, many demons had noticed that he was related to the hero, even if they didn't know he was the hero himself.
It was natural for them to resist him.
But he embraced even those demons and earned recognition from those who disliked him. Of course, more than half of it was just suppressing them with his strength, taking advantage of the demons' characteristic of worshipping strength, but as a result, they fell for the strong successor.
Now, there were only a few demons who didn't follow him, and there was not a single demon who doubted that he was the next Demon King.
He was also great as the supreme commander of the army. Despite always working in the field rather than in the leadership, he had a broad perspective and cool judgment to grasp the battlefield.
If she were to talk about his other strengths, Irena could talk for hours. It was rather difficult to find his weaknesses.
It was the same for him as a man. While even other demons looked at succubi with prejudiced eyes, he always treated her warmly. And he, who was always kind, became a ferocious beast in bed, making love to her as she desired.
Irena had fallen for him so much that she could no longer live without him.
"…Hehe."
Thinking about this and that, she ended up letting out a silly laugh.
"Why are you laughing like that?"
"Ah, it's nothing."
"Huhu, okay."
Feeling his affectionate hand stroking her head, Irena fell into a short nap.
"Are you all set, my son?"
"Of course."
He answered the Demon Queen's question with a confident smile.
It was the moment when the Demon Queen's son himself was leaving to infiltrate the continent, but there were only a few people present.
The person leaving, Irena who was accompanying him, the Demon Queen, two of the Four Heavenly Kings who were inside the Demon Lord's castle, and the head of the intelligence unit in charge of spies.
A total of six people. Two of them were leaving, so there were only four people actually seeing them off.
It was because this mission itself was top secret.
The next Demon King was infiltrating the continent. They couldn't rule out the possibility that there might be a demon colluding with humans. He was going to be known to the public as entering training to shorten his awakening period.
"By the way, the coordinate engraving using blood is amazing."
One of the Four Heavenly Kings, the Elder Lich, Imur, suddenly exclaimed in admiration.
"…? I told you about it before."
"Ah, I'm sorry."
"Forgetful again? Seriously."
He looked at Imur with exasperation.
He already knew this, but he couldn't get used to this lich's forgetfulness.
"Haha, what can I do? I should be grateful that I even survived."
Imur had also held the position of one of the Four Heavenly Kings 18 years ago.
He had fought against the hero's party. In the final battle, Imur, who had blocked him when he was the hero, had been critically injured and barely survived, but he had to suffer from forgetfulness like this.
"Well, I'll explain it to you again later, so fix that."
"Heh heh, I'll finish it within two years."
Therefore, Imur had been conducting various experiments to cure his forgetfulness. Other than that, he was one of the top combat forces in the Demon Lord's castle.
He chuckled at Imur's answer and soon prepared the warp magic.
An ultra-long-distance movement from the Demon Lord's castle to their first destination, the hideout located in the Ulstro Kingdom.
Normally, warp magic couldn't be used alone. The required mana, understanding of spatial magic, coordinates of the location, mana utilization, etc., were not easy at all.
But he could do it.
There were various preparations in place, including a magic circle, to help him use magic smoothly. And the bloodline coordinate engraving he had carved into the hideout when he created it.
With the restriction that it only reacted to his blood, he had prepared it so that he could use warp magic with minimal power.
"Then everyone, I'll be back."
"We'll be back."
At his and Irena's greetings, the Demon Queen's eyes reddened slightly. It was a situation where she might not see her beloved son and lover for up to two years.
It couldn't be helped if she shed tears.
"I'll try to come back a few times if possible, so prepare for war well."
"Alright. You be careful too, my son."
"Ah, of course."
The mana that started from his hand flowed through the magic circle. With a flashing light, the two people standing on it disappeared without a trace.
The Demon Queen, who had been staring at the now empty magic circle, soon turned her back.
"…Then let's get ready too."
"""Yes!"""
Thus began the countdown to a new war.