I Became the Final Boss’s Limited-time Teacher

“Hahaha! To think you’d give a beating to the invulnerable incubus in a dream! Truly, you have some ridiculous disciples!”

“……”

“Well, since I had an entertaining experience, I won’t nitpick about mistakes. New stimuli are incredibly important for a dream demon after all.”

Gabriel smiled gently as she looked at the disciples behind me, causing Biwool and Verdandi to flinch in surprise.

Right now, Gabriel, Biwool, Verdandi, and I were walking out of the Street of Dreams and into the rugged Northern Mountains.

This place, known as the Iron Claw Mountain Range, was said to have once repelled a gigantic dragon’s brutality long ago.

With every step we took, the steep incline welcomed us, and crunch sounds echoed as the snow crunched underfoot.

“Whoah! It’s unbelievably cold! How come the senior and master look just fine?”

Verdandi exclaimed, shivering and puffing out white breath. She seemed to find it strange that Biwool and I appeared unbothered.

“I guess I’m just built this way.”

I was born with a chill far greater than my half-sister, so this level of coldness was warmer than my body temperature.

Why was I abandoned in the Five Poison Sect when I could be taken for a fortune in the Northern Sea Ice Palace?

Thinking back, it seemed to be a setting error due to the sudden addition of a supporting character to explain my extreme chill.

I was fated to die at the hands of the Heavenly Demon Biwool anyway.

‘At least I didn’t mess up like that one time with Ifrit of the Volcano Clan or the Master of Shaolin.’

I sighed deeply inside as I contemplated.

I almost described the Three Talented Sword Method as having horizontal cuts, vertical cuts, and thrusts, but there are other sword methods too, right?

In martial arts, if you’re going to get history wrong, you might as well make it fun. Otherwise, you won’t recover your investment.

That was something I learned while writing the novel King of Diamond Fist. The skills in life don’t simply rise steadily but grow in steps instead.

“I’m trying to learn Cold Poison Immune to withstand my master’s chill.”

Biwool whispered beside me, lost in thought. Cold Poison Immune is a realm that surpasses warm-blooded animals, where body temperature stabilizes in any environment.

“…Why are you trying to learn that? Isn’t Cold Poison Immune something only found in legends?”

“Yes, but to become the only girl who can understand my master later, a girl needs her own distinguishing feature, right?”

Her determined attitude made me stick out my tongue in surprise. A naturally gifted constitution that allows her to learn all martial arts effortlessly.

‘Heavenly Body…. Is it really possible to be like this?’

Possessing all the energies of extreme yin, extreme yang, three talents, five elements, and the taiji, she can harmoniously master any martial art, remembering its form once seen.

If it’s Biwool, she might really learn Cold Poison Immune. I felt a chill run down my spine and huddled my shoulders.

“Impressive! If there’s a way I could endure such cold, I would like to know!”

Verdandi said, clenching her hands into fists and sparkling with excitement, enviously looking at me and Biwool.

“Maybe when you get Sacred Armor, you can.”

“Sacred Armor! The very appearance of the hero that I’ve always dreamed of in my imagination!”

At the mention of that term, it seemed like starlight sparkled in Verdandi’s eyes.

An item that provides absolute defense to whoever wears it. I set it up in such a way that with it, no attack could harm her.

“Yeah, I don’t know exactly how to acquire it either.”

I did have some inkling about it.

Just like in the original story, Verdandi would likely obtain it when she receives a deathly injury, like a character powering up.

“Oh, I see… So even my master doesn’t know everything.”

Upon realizing the truth, Verdandi’s expression darkened slightly, and I patted her head as I often did with my disciples.

“Your master’s touch is cold, yet it feels warm!”

At that, Verdandi looked like a huge golden retriever, raising her heels to receive more of my pats.

“Cold yet warm? What does that even mean?”

“Though your body temperature is very cold, your heart feels even warmer!”

Watching Verdandi say something akin to a yandere character who pulls out a human heart and goes, ‘See? This is the warmth of love!’ gave me an eerie feeling.

Come to think of it, she executed a knife play on our first meeting. Now, I couldn’t help but feel a chill that she might grow to crave a twisted affection like Biwool later.

‘Speaking of which, didn’t I receive a kiss on the cheek last time…?’

I thought that sort of thing was common between teacher and disciple. I mean, isn’t it normal for a child to kiss a parent before heading out to work?

I scratched my chin as I tried to wrap up my thoughts.

“Master, you have one hand free, right? I want your petting too!”

“Alright. How about this?”

“I would like you to gently stroke my cheeks and gaze at this girl with greedy eyes as if you wish to take everything away from her… Ah, why are you stopping?”

Swipe I was tickling Biwool’s cheeks and jaw when I heard that frightening remark and instantly withdrew my hand.

Verdandi’s affection was innocent, while Biwool’s showed signs of sickness somewhere.

“Watch your words and actions considering the eyes around you.”

“Oh dear, but I’m fine? After all, a reverse harem is just that kind of genre, isn’t it?”

I couldn’t help but doubt my ears to Gabriels’s words. Even if she’s a character from a game reincarnation story, isn’t a term like that a bit much?

“Raising a child like mine into a perfect woman and watching the feelings that sprout as she transforms into a woman until they peak and explode with catharsis.”

“……”

“Isn’t that the true form of love? The man who has raised a child untainted eventually gets devoured by her… Ah, just thinking about it makes my mouth water.”

“And so you’re guiding me to Azazel? You want her to have bad thoughts about me later on, don’t you?”

I finally understood Gabriel’s intent and grimaced. For a succubus, love is like a deadly poison, and I didn’t want another disciple falling for me in this state.

“No. I’m just curious how things will change when I see you later! You might end up tied up in some dungeon, while an overwhelming ○○ does ○○ to you!”

“Master! What on earth does ○○ mean!”

“You don’t need to know yet.”

I couldn’t answer the innocent Verdandi’s question. I might have to give her a sex education first if I were to explain it.

“Senior! You seem to know something!”

“Uh, um… Well, I’m not sure… Aha, what could it mean?”

Biwool’s face turned beet red as she avoided making eye contact with me, and Verdandi, sensing something was off, stopped asking about the term.

“Aha, I get it! You two are holding back your words because this is some curse related to the Demon King!”

With a thwack, she clapped her palm against her fist, beaming with pride.

In order to preserve her innocence, I hurriedly quickened my pace without saying anything.

“Here we are. There’s quite a thick snowstorm guarding this place, so normally, I wouldn’t be able to come here for days.”

In the clear blue sky, a small, shabby monastery began to come into view.

“I’ll head down from here.”

At that moment, Gabriel’s smile faded and her steps turned back.

“Aren’t you coming with us? After all, she’s your sister.”

I subtly grabbed her as I observed her. I originally intended to take Azazel along and resolve the discord between these sisters.

“I had been secretly pretending to be an unknown benefactor offering food. If she realizes it was me, she’ll probably refuse to eat or drink anything and try to die.”

Despite my statements, Gabriel shook her head, wearing a bittersweet smile.

Wasn’t it her consideration that Azazel could somewhat keep her health while alone in such a rugged mountain?

“Well then, my cute disciples. I hope to see you laughing together with my sister later!”

Gabriel waved her arms vigorously with a bright smile, but underneath lay an unspoken sadness.

*

Sunlight streamed through the stained glass, shining in splendid colors in the monastery, where a girl was kneeling and praying.

“Once more, I pray in the name of the Holy ■■■■■■. May You dye this world ■■ and strike down those who practice false love with Your divine hammer….”

The girl dressed in black nun robes was Azazel Blackheart, Gabriel’s sister, who had just descended from the mountains.

“…Oh my, lost little lambs have arrived.”

Realizing someone had entered the monastery, Azazel momentarily paused her prayer and turned to the door.

“Oh dear, ■■■■■■, I’m fine. I have the eye to foresee the future after all, don’t I?”

Behind Azazel, there was a writhing black tentacle that seemed to have a mind of its own, and she sweetly caressed it while talking to herself.

“That sister of mine….”

“Is it really coming from a villain? She looks devout on the outside.”

At that moment, the monastery door swung open, revealing individuals with different hair colors.

“…Azazel Blackheart. The Saint of Mercy, am I right?”

Bing Yeon addressed Azazel, who was not familiar with the term. The title of the Saint of Mercy was something given by the man she once considered her partner, Kang Si Woo.

What reason could he have to mention that term?

Could that man also be a captive charmed by her sister? Trying to get his hands on her as well?

Azazel’s thoughts veered into extremes. After being betrayed by a person before, she couldn’t trust anyone she met for the first time.

“It’s been quite a while since I cut ties with the world and came to this place….”

With her rainbow-hued eyes wide open, Azazel immediately attempted to foresee the future.

“…Verdandi, Biwool, prepare for battle.”

Seeing that, Bing Yeon sent his disciples into combat mode while he accumulated the cold energy throughout his body.

“Uh, a…? Oh, hehehe? Huh…?”

In that instant, blood began to flow from Azazel’s nose.

Had she seen some bizarre future? Suddenly turning red, she was mumbling incomprehensible sounds.

Denying the future she just witnessed, she tried to block her nosebleed with her hands, but the warm sensation of blood was grounding her in reality.

“…This cannot be my future. How could I be rolling around on a bed with such a lewd man, leaving Lord Si Woo aside! It’s nonsense!”

She pointed at Bing Yeon, yelling,

“……? Wait, what did you say?”

Upon hearing that absurd future, Bing Yeon turned to the side after feeling the piercing gazes from both of his disciples staring at him with strange expressions.

*

– Azazel, did you keep the promise not to touch the master until we all come of age?

– Yes, of course. For my sister and brother, what wouldn’t I do?

What Azazel had just seen in her vision was something like this.

– How did I raise you all…, ugh, ugh…! Ugh…!

– Please be quiet. This is all a sin made by my brother. I hope you repent joyfully.

A man was bound to the bed, blindfolded and gagged, while before him, others were engaged in a game of rock-paper-scissors to decide who would first climb on top.

– It took quite a while. I didn’t expect to wait for you for five long years.

– As expected from you, Azazel-senpai! Solving such a tricky problem by blindfolding him!

– This is easy. I am someone called the Saint after all. It’s his fault for falling for me.

In contrast to their current appearances, the more mature Biwool and Verdandi had predatory glints in their eyes.

– Sigh, Master…♡ You haven’t forgotten that promise, have you?

Among them, Biwool, who had loosened her clothing, was slung over Bing Yeon’s waist.

And then…

– You saw, didn’t you?

The adult Biwool slowly rose from her seat, grinning at the current Azazel, who was comprehending the situation.

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