I Became the Mentor of the Weakest Demon King

Chapter 50



Episode 50

After returning from the human world, Nahun and Seere resumed their daily routines. There was a considerable amount of work to be done in the process of strengthening the army and recruiting new soldiers. While the division commanders and sub-commanders were responsible for selecting capable individuals, it was ultimately the Demon King’s responsibility to approve them.

As a result, Nahun had taken over part of Seere’s workload, which largely involved reviewing endless piles of paperwork and stamping approvals. It was during this time that a woman entered Nahun’s office.

“Nahun-dnim.”

“What is it, Cecili?”

Cecili, the loyal maid of the Demon King Castle, politely greeted Nahun and looked at him with a serious expression.

“Before I speak, please understand that this is not out of dissatisfaction with your teaching methods.”

“…Ah, go ahead.”

Cecili seemed to be leading into something unexpected.

“I would like to suggest improvements to your classes.”

The mention of class improvements startled Nahun. Could it be that Seere had complained to her about his teaching?

“Is… my class not interesting?”

“Excuse me?”

“Did Seere say that my class isn’t fun?”

“…No, that’s not the case. I am simply voicing my personal opinion.”

“Uh?”

Intrigued, Nahun decided to hear her out. Whatever it was, Cecili went on to make quite a shocking suggestion.

“We need sex education.”

“…Eh?”

Nahun let out an awkward response, stunned by the statement, while Cecili remained dead serious.

“This year, His Majesty will be turning twelve, soon to be thirteen.”

“Ah, yes.”

“However, during our recent visit to the human world, I discovered something quite shocking.”

“A shocking thing? What is it?”

“His Majesty still believes babies are delivered by dragons.”

Nahun momentarily felt his mind go blank.

‘Could this be one of those types of stories, about storks delivering babies?’

His guess was correct. Cecili continued with a grave expression.

“His Majesty has received no sex education whatsoever! Now, children around eight to nine years old don’t still believe that dragons deliver babies. Yet, His Majesty still seems to think that!”

“Eh…yeah, it does seem a bit extreme.”

“Which is why it is absolutely necessary to provide the proper sex education to His Majesty. We can’t risk Him falling for someone inappropriate later on!”

“!”

That indeed would be a problem. If Seere fell for the wrong person and neglected her responsibilities because of it, Nahun would not be able to see the ending.

Moreover, the thought of Seere, whom he had raised with such care, going to some strange person was also unsettling. After reflecting on Cecili’s words, Nahun recognized the definite need for sex education.

“Yeah, seems necessary.”

“Thank you, Nahun-dnim. I trust you will guide Him properly.”

“…Me?!”

“Then who else will teach Him?”

Nahun coughed awkwardly, clearly flustered, and turned to Cecili.

“Cecili, wouldn’t it be better if you did it?”

“How could I possibly teach His Majesty? I’m neither in the right position nor qualified to do so.”

“But wouldn’t it be better for someone of the same gender? I’m a teacher, sure, but I’m still a man. Seere probably wouldn’t want to learn such embarrassing things from a man.”

“Hmm, that’s true….”

Cecili nodded in agreement at first, but then hesitated, recalling something. A gentle smile crossing her face, she proposed something else.

“Still, His Majesty would likely prefer learning from you, the one who has always taught Him.”

“Me?!”

“Yes.”

Though troubled by Cecili’s suggestion, Nahun acknowledged its necessity. Given how old Seere was, it was certainly time for her to be educated in such matters.

However, the thought of him personally teaching it was problematic. Even though Seere was naive, caution was still necessary. What if she got the wrong impression and ended up emotionally scarred? It would be far better for someone maternal to teach her.

“…Ah.”

One person came to Nahun’s mind, someone perfectly suitable for the task.

“Cecili.”

“Yes?”

“Please call Rea.”

“…Hmm.”

Cecili let out a sudden sigh. Nahun looked at her questioningly but received no answer. She simply bowed her head and accepted his order.

“I will fetch Supervisor Rea.”

“Ah, thank you.”

Once Cecili left, Nahun felt somewhat puzzled. Before leaving, Cecili had clearly worn an expression of dissatisfaction.

“…Why is she so upset?”

Nahun wasn’t stupid. Cecili seemed displeased that he wasn’t handling the teaching personally, but he couldn’t figure out why.

“…The thoughts of demons remain as confusing as ever.”

Rea, the head supervisor of the Demon King’s castle and one of Seere’s strongest subordinates, was known for her gentle appearance despite her exceptional martial prowess. Ranked second only to the butler, Cain, among the castle’s staff for her combat abilities.

“Ah, Rea.”

“Did you call for me, Nahun-dnim?”

Rea also happened to be Seere’s nanny since childhood, having taken care of her after Seere lost her mother at an early age. While Seere greatly respected and liked Cecili, her loyalty to Rea was even deeper.

Thus, there was no one more suitable than Rea for this educational task. She shared the same gender as Seere, was trusted and maternal, making her the ideal candidate.

“There’s something I need your help with.”

Nahun began, and Rea tilted her head curiously.

“Is this task related to His Majesty?”

“…Yes.”

Rea was quick-witted. Her keen insight as the one who once oversaw the inner operations of the castle only solidified Nahun’s trust, though her occasional perceptiveness sometimes made him feel nervous.

“I’ll decide after listening to the details.”

“Does that mean you can refuse?”

“Of course. If it’s unreasonable, I have no choice.”

“Rea, you know that I’m not the type to ask for unreasonable favors.”

“Ah, unless it’s something concerning Citri-dnim.”

“That….”

Nahun narrowed his eyes, prompting Rea to bow apologetically.

“My apologies, I couldn’t resist teasing a bit.”

“…Alright. Let’s get to the point.”

Nahun’s tone became serious, his face showing a grave expression. Rea unconsciously tensed up.

“Seere requires sex education.”

“…Eh?”

Rea’s surprised reaction made Nahun shake his hand.

“This isn’t something I came up with myself, so please don’t misunderstand.”

“Ah…yes.”

“I’m serious! It was actually suggested by Cecili, and upon consideration, I agreed it was necessary. Seere still seems to think babies are delivered by dragons.”

“Ah, that is a bit extreme. Now that you mention it, we haven’t really educated His Majesty in that area.”

“Right? Now that you understand the need?”

“Yes. I will educate Him properly then, right?”

Nahun, about to readily agree, hesitated at the word “properly.” Was there an option to teach it improperly? Though a bit uneasy, Nahun nodded.

“Yeah, thank you.”

“One day should suffice. I’ll request a day off from you.”

“…A day?”

Nahun was momentarily stunned by the mention of needing a whole day, but seeing Rea’s confident expression, he decided it must be normal among demons.

“I’ll let Seere know there’s no class tomorrow.”

“Understood.”

Rea bowed politely, and Nahun nodded, trusting her judgment. However, he couldn’t foresee the consequences this decision would bring.

“That’s how it is, His Majesty.”

“Uhm, yes.”

“To-day, I will be teaching you, Your Highness.”

Seere looked at Rea, clearly nervous. Rea adjusted her glasses and gestured toward something written on the chalkboard with a pointer.

“Now, please read what’s on the board, His Majesty.”

“Sex… organ?”

“Whether human, demon, or angel—any biological being—most possess a reproductive organ. It simply refers to the parts of the body that allow for reproduction.”

“Ah…uh-huh…”

“There’s nothing embarrassing about it. Procreation is a natural biological desire and instinct. Reproductive organs are just the tools to fulfill that function. Across species, the location differs, but for intelligent beings such as demons, humans, and angels, it’s generally located between the thighs, near the groin.”

Despite Seere’s naivety, she instinctively realized this was an embarrassing subject and nodded silently.

“Did you know that males and females have different organs?”

“Different…? What kind of differences?”

Seere tilted her head, genuinely puzzled. Rea explained simply.

“Men have external reproductive organs, while women have internal ones.”

“External…? So they’re outside?”

“Yes, exactly.”

Seere tried to imagine what it looked like but quickly stopped as it seemed unsettling. She blinked and asked:

“Why are they different?”

“There is a reason, and now I will explain.”

Rea erased the chalkboard and wrote another word. As Seere read it, her face turned bright red. Rea pointed to the chalkboard.

“What is that?”

“Sex… S-E-X.”

“Exactly. This refers to the culmination of love between a man and a woman, the act of reproduction that leads to new life. The differences in organs assist with this process.”

“Huh? What does that mean…?”

“Do you understand how babies are made?”

“Uh…Cecili mentioned it.”

“In that case, you know that a man must insert into a woman. That’s why their organs are shaped differently.”

“Ah…oh.”

Seere was an inquisitive child who usually lit up at the chance to learn something new. Today, however, Seere wasn’t sparkling with curiosity but instead remained shy, embarrassed to ask questions.

Even though it was necessary knowledge for life, it was undeniably embarrassing. As Seere groaned uncomfortably, Rea gave her a motivating remark.

“Your Majesty.”

“Uh?”

“If you listen well today, I’ll also teach you how to attract a man.”

“Wha…?”

“A woman should know how to win the man she likes. Someday, when you find a man you like, you’ll be able to put this knowledge to good use. Not interested?”

“Not at all!”

Not in the least.

Seere’s eyes brightened for the first time that day, enthusiastically engaging with Rea.

“I… want to learn!”

“Excellent. First, we need to properly understand the topic of sex. Can you follow along?”

“Yeah, got it!”

That day, Seere learned many things from Rea—more than she could have imagined.



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