I Knew This Would Happen Someday
My sister strode toward me, her face twisted with a murderous intent so thick it was palpable to everyone in the room.
It was a suffocating, heavy malice—something incomparable to the time I had dared to call her a succubus. Unlike me, who had been delighted by her sudden appearance, all the demons behind her were cowering, trembling in fear.
My sister’s gaze touched upon me for a brief moment. It was a fleeting instant, yet for that short time, her eyes held a gentle warmth. It felt as if she were slowly stroking my hair. But the moment her eyes shifted back to the demon who had tried to accost me, that bone-chilling malice returned with a vengeance.
—Squelch!
The demon's legs were severed cleanly at the thighs.
"Gyaaaaaaah!!!"
I hadn't even seen her draw a weapon. As I watched the demon collapse, my vision suddenly went dark.
"Runi, didn't I tell you? Never let go of my hand."
"...I'm sorry, Sister."
"I'm not scolding you, Runi. Just stay with the demons over there for a moment."
"O-okay..."
"Take Runi and go to my room."
"Understood, Belial-nim."
I walked away with the demons, my vision still obscured.
"Ingrid."
"Yes, Be... Belial-nim..."
"You told me this yourself. That you would never fall out of my favor. That you would be a loyal servant who would do anything."
"T-that is correct..."
Demons who govern human desires have the right to personally select the demons who will follow them. These selected demons are then transformed into human forms by the power of their master. I had selected five in total. Back then, a pathetic-looking demon had appeared, clinging to my ankles and begging me to choose them, too. They promised to be a faithful servant who would do anything I commanded.
I had checked their magical power, and it was barely worth the effort. I saw no reason to bestow my power upon them. However, there was one thing that caught my interest: a deep, insatiable greed. When I told them to go cling to the ankles of the Demon of Greed instead, they had replied that they wanted to become a beautiful woman—and that they wanted to possess both male and female genitalia.
Only I, among all the demons, had the power to grant such a request. The creature knew information that none of the other demons I had selected possessed. I liked that, so I made them mine and bestowed upon them the name Ingrid.
"Is this how you repay my favor?"
"N-no... Belial-nim."
"I knew this would happen someday. But I never imagined the target would be the most precious thing in my life."
I stomped on Ingrid’s head as they groveled.
"Didn't I tell you? Know your time and place."
"Yes, Belial-nim..."
"Is Gehenna a place for you to collect your fuck-toys?"
"N-no..."
"And you didn't even show yourself when I arrived because you were too busy fucking a human woman?"
"I am sorry, Belial-nim."
This wasn't the first time Ingrid had caused such trouble. I had turned a blind eye only because they kept bringing me the magical power I needed. Every time, I warned them, and they would always focus on finding a way to smooth things over, claiming they would keep it in mind. This was the result.
—Thrust!
"Guh...!"
I summoned a black spear from the ground, piercing Ingrid’s chest. They didn't even resist, letting their body hang on the spear so they could look me in the eye.
"Ingrid, what should I do with you?"
"J-just once... give me one more chance... I will..."
—Crunch!
"Aaaaaaagh!!!"
I couldn't stand the sound of their voice, so I shattered their jaw. I snapped my fingers, perfectly restoring every severed part of their body.
"Haa... haa..."
"Right, I'll give you one last chance. But you have to pay the price for touching what is most precious to me."
"P-please... Gyaaaaaaah!"
"I said I'd let you live. Don't worry, you won't die."
From that moment on, a torture that would never end began. I reached into their abdomen to pull out their entrails, and I tore their mouth open from top to bottom. Whenever their body was reduced to a rag from such torture, I would snap my fingers to restore them perfectly. And then, I would repeat it. Hundreds, thousands of times.
"Huuuh... guh...!"
"You bleed so much, it's a nuisance to wash."
"Guh... haa... haa..."
"No answer?"
"I-I am sorry... Be... Belial-nim..."
When the torture finally ended, Ingrid was physically intact, but their mind had already been shredded into pieces.
"If I catch you fucking a woman in some alleyway again, I will kill you."
"I-I will... keep it in mind..."
"And when I appear, show yourself immediately. If you don't, I'll kill you then, too."
"Yes, Be... Belial-nim..."
Despite these atrocities, I gave them one last chance because they had such high potential for growth. The fact that they had gone from the weakest of my selected demons to the strongest was proof of that. They probably started harboring hatred for me. They would use this hatred to grow stronger, hoping to one day challenge me. I am waiting for that day. The day I make them realize that no matter what means or methods they use to grow stronger, they will never even reach the tips of my toes.
Demons who govern human desires are granted private spaces. I had left Runi to rest in mine, and I stepped inside to see her.
"Runi, are you okay?"
With the demons attending to her, Runi seemed to have regained some composure.
"You were scared, weren't you? I'm sorry. I took my eyes off you for a moment."
"No, Sister. It’s... I’m the one who didn't keep the promise I made to you. I’m sorry."
Seeing her speak in such a calm tone, I knew her anxiety was slowly subsiding. I sat beside her and pulled her into a slow embrace.
"So this is why you told me never to let go of your hand."
"Yes, that's right. I should have explained it to you in more detail."
"I'm really okay. Even though I was a little shocked."
"That bastard didn't do anything else, did he? Like touching your breasts or trying to insert himself?"
"No, he just... he was pressing his erect cock against my lower abdomen."
When Runi had vanished in an instant, it felt as if my entire world were collapsing. Since this was Gehenna, where all demons reside, a human wandering alone was equivalent to suicide. I had been ready to turn every demon in Gehenna into my enemy just to get her back if she had been harmed.
"I'm sorry. For letting something so filthy touch your body."
"Oh... actually, I was flustered at first, but after a little while, I wasn't."
"Is that so?"
"It... it was smaller than yours, Sister. So, I don't know... it didn't feel threatening?"
"Pfft!"
Hearing that from Runi, who used to be terrified just by the sight of my cock, made it impossible not to laugh. I wasn't sure if I should take that positively or negatively. Regardless, it was a positive sign that Runi hadn't been deeply traumatized.
"Sister, what kind of work do you do here?"
"I supply magical power."
"Magical power? Since you're the demon who governs human sexual desire, don't you have an overflow of it?"
I debated whether to give her a detailed explanation, but I decided it wasn't the right time yet.
"Hmm, just know that's not the case. I'll tell you more later."
"Okay, I understand. Then... are we going home now?"
"I only came here because I was worried about leaving without telling you."
—Smack!
At that moment, Runi’s palm struck my shoulder. She even grabbed my hand tightly, clearly in a situation that raised questions.
"Do you have any idea how panicked I was? You just disappeared suddenly."
"Was it that bad?"
"Why did you leave without saying anything? You could have at least told me before going somewhere."
"I'm sorry, Runi. I thought I would be finished before you woke up."
"Then you could have at least left a note!"
"But tell me, isn't it a good thing for you if I suddenly disappear?"
At this question, Runi’s barrage of words came to a sudden halt.
"The demon who’s always trying to fuck you disappeared, didn't he?"
"That’s..."
"If the demon who bothers you is gone, I’d think that would be a good thing from your perspective?"
Runi’s pale face flushed bright red in an instant.
"S-Sister, you’re my summon, anyway. If my summon disappears, then what does that make me...!?"
She stammered, trying to make excuses for something, her voice faltering. As time passed, her face seemed to grow even redder.
"I-if you suddenly disappear... I have to tell my parents that I really couldn't summon a familiar... and then... it becomes very complicated..."
Runi’s incoherent excuses and stuttering completely captivated my heart. For a demon, human emotions shouldn't exist. I had known that for a long time, but ever since Runi appeared, a question had begun to form: Could human emotions truly not exist?
—Squeeze!
"Ugh... you're suffocating me, Sister."
"Why are you so cute? It makes me want to ravage you right now!"
"W-what are you saying!"
Runi is a testament to me. A testament that human emotions can exist within a demon.