Chapter 28 - The Perpetual Sex Engine

"Ngha ❤️❤️ Ahiiiiiiii❤️❤️ My pussy is getting hollowed outttt❤️❤️❤️❤️ By your dickkkkk❤️❤️ By your shaft's super erect dickkkkk❤️❤️"

Inside the cavernous dungeon, the delightful sound of flesh striking butt cheeks echoed profoundly.

Grabbing Big Sis’s ass tightly enough to make it flex, I thrust my penis deep into the parted depths of her core. From there, simply pounding my hips as desire dictated was the act known as sex.

My sister was completely naked, leaving her swaying breasts, trembling ass, and the vagina that snugly swallowed my male organ completely exposed.

Stark naked, deep inside this dungeon.

"In a dungeonnnn❤️❤️ My pussy is getting relentlessly pounded in a dangerous placeeee❤️❤️ Even though we don't know when an enemy might pop outtttt❤️❤️"

 Yet, watching my sister grind her hips back of her own accord, she looked as though she was thoroughly enjoying the thrill.

Watching my sister's decadent display, the rest of our adventuring companions—who had also stripped completely naked just like her—gazed on intently.

"Calibur always looks so incredibly pleased with herself...?!" 

"Those two are actual siblings, right? I think about this every time, but is it really okay for them to be screwing each other so much...?!" 

"Isn't it a beautiful form of sibling love? We should bless them with all our hearts!"

As they conversed, every single one of them without exception reached down to fondle their own crotches. They were indulging in masturbation, using this live exhibition of incest as their raw material.

And then, turning to the other person...

"Big Sis, how many times did you come?" 

"I don't knowoooooo❤️❤️ I definitely came at least four timesaaaaa❤️❤️"

Reaching climax that many times was surely sufficient.

Since the others were waiting in line, I figured I'd give my sister one last load and wrap things up.

"Phewiiiii❤️❤️❤️❤️ It's coming out, it's coming out❤️❤️ There's so much semen inside my pussyaaaaa❤️❤️" 

"There's no point unless I creampie you, after all."

Especially this time.

"Alright, Big Sis is fully satisfied, so whichever lady is getting ploughed next, please step forward." 

"Yay! It's my turn next, right! Give it to me so hard that the shape of my ass gets warped!" 

"That is incorrect, Bloom! It was absolutely decided by rock-paper-scissors that I would be second! Cheating is forbidden!" 

"If possible, please take me...!"

The women swarmed, competing aggressively to claim my penis. For a man, isn't this the ultimate state of happiness?

And then...

"W-What on earth... is this...?"

Gazing upon this spectacle with an expression that was halfway between dumbfounded and entirely shell-shocked was a single woman.

The veteran adventurer, Gurka.

As a temporary participant in our party, she was the only one fully clothed. She was also the only sane person present.

"Why are you suddenly starting to have sex deep inside a dungeon? Why is everyone completely naked?" 

"Allow me to explain."

If I didn't explain the situation soon, things were going to get far too chaotic to comprehend.


The key to the situation lay in a pair of new skills I possessed: Sex Charge and Sex Boost.

Both are skills that influence the partner through the act of copulating with a woman. Sex Charge completely restores depleted physical stamina and mana, while Sex Boost applies a powerful stat-enhancing buff.

Using sex as the activation trigger is what fundamentally separates these from other similar skills, and even under the broad umbrella of 'sex,' the detailed conditions are incredibly strict. If those conditions aren't met, the system won't recognize it as sex, and the skills won't trigger.

For starters, the sex must consist of a conjunction between a female genitalia and a male genitalia. Any other form of contact is not recognized as authentic sex. Oral sex, handjobs, anal sex, and even cunnilingus or fingering are all treated as simulated sex performed with substitutes for the primary genitalia, and are thus rejected by the skill.

Consequently, any form of physical intimacy performed between males is naturally not recognized as sex, making it utterly impossible to use these skills on members of the same sex. Even if it were possible, I wouldn't do it if my life depended on it.

Furthermore, the skill dictates that for sex to be successfully established, the male and female organs must copulate, and both parties must achieve climax. It seems things won't work unless both scale the heights of pleasure to their absolute peak.

Ejaculation for the man, an orgasm for the woman.

When both the man and woman achieve climax during a single continuous coupling, the sex is considered complete, and the skills activate. For example, if one party reaches climax but they separate before the other can do the same, the progress resets, and you have to start over from the very beginning.

It is an incredibly tedious process, but if the female reaches orgasm multiple times before the male ejaculates, a bonus is applied to Sex Boost for each additional climax, driving the buff multiplier even higher.

When I mentioned before that the maximum buff rate for Sex Boost could reach up to 400% if the conditions were met, this was one of the concrete requirements.

In other words, the more times you make a woman come during a single session of sex, the more advantageous it becomes for you!

I have no idea exactly how many times you have to make a woman climax to reach that 400% cap, but since the multiplier also scales based on the volume of semen injected into the vagina, it ultimately boils down to a comprehensive combination of factors.

Since the male and female organs must absolutely not separate until the sex is fully complete, the finish inevitably has to be an internal ejaculation. I wonder if there's some sort of underlying allegory at play here, along the lines of 'it isn't true sex unless it's for the purpose of making a child.'

While Sex Charge and Sex Boost only trigger after clearing such a vast array of meticulous conditions, there is yet another crucial requirement to fulfill.

The quality of the sex.

How intensely the man and woman holding each other elevate one another's pleasure, and how deeply they care for each other. How serious they are about the act of sex itself brings an enormous impact on the overall effect.

A careless, half-hearted session of sex performed solely for the purpose of triggering the skill effects will yield neither recovery nor reinforcement.

Precisely because of this, during sex, even the minimalist fabric of a bikini armor must be shed to become completely naked—for total nudity is the formal attire of sex! You must gaze directly into your partner's eyes, occupying a world meant only for the two of you, completely liberated and saved without anyone to disturb you.

Distracting yourself with other matters while having sex is entirely out of the question.

Do not idly slip your penis into a vagina. Maintain absolute awareness of the woman you are violating. That is the responsibility, the solemn duty imposed upon those who consume women!


By the time my lengthy explanation concluded, my sessions with the remaining three women had wrapped up as well.

Four female bodies lay scattered about, their lower halves completely melted from pleasure, leaving their bare asses fully on display.

"S-So... that's why you were wearing armor that looks like underwear?" 

"With that gear, it's incredibly easy to strip bare and put it right back on, you see."

Perhaps because she was a top-tier expert in her field, the veteran adventurer Gurka possessed high comprehension skills. To think she could swallow an explanation as completely unhinged as mine without any trouble.

"No, even so, this is the very first time I've ever encountered a skill as bizarre as yours. If a skill like that exists, wouldn't you be able to sleep with female adventurers to your heart's content?" 

"Even someone like you, Gurka?" 

"My, young people truly have no discretion, do they?"

No, it's just that you are incredibly attractive, Gurka.

"You've already devoured and scattered so many young, cute girls like this, and you're saying it's still not enough? The libido of the youth is truly bottomless. But what a pity; a veteran adventurer is highly cautious and deeply suspicious by nature."

Gurka flashed a mischievous, teasing smile.

"Besides, there's a very good chance that this entire explanation about your skills is nothing but a fabrication you made up on the spot. Just a line to deceive girls and dump them after having your way. In fact, look at the girls you just ploughed; they're still collapsed on the ground with their legs completely turned to jelly, aren't they? They don't give off the impression of being recovered or strengthened at all...!"

Before Gurka could even finish her sentence, four silhouettes stood up in a single fluid motion. While a heavy torrent of semen spilled from their fully exposed genitalia, an even greater surge of raw spirit and battle aura erupted from their bodies.

"Power is overflowinggggggg!" 

"My mana is completely full! With this, I can fire off sixteen consecutive full-recovery spells in a single seconddddd!!" 

"I can cast my ultimate offensive magic all over againnnn!" 

"The more we do it, the more my strength surgeseeee!!"

Their hyper-enthusiastic tension was practically terrifying. To think that after having their depleted physical stamina and mana fully restored via Sex Charge, and getting reinforced via Sex Boost, they would turn out like that.

"Eh? Eh? Ehehhhhhh...?"

While Gurka remained entirely bewildered, we steadily pressed forward. Because we stopped to have sex and resupply every single time we wiped out the monsters on a floor, we were able to operate at absolute full power for almost every single engagement.

As a result, not a single enemy could withstand that overwhelming onslaught, resulting in a flawless victory across every floor and every battle. The fourth floor, fifth floor, sixth floor, seventh floor, eighth floor, ninth floor... We blasted through them at an incredible velocity.

"Wait! Hold on a minute!"

As we prepared to advance after wrapping up another round of sex, Gurka held us back.

"Just how far do you intend to go?! At this rate, you're going to charge straight into the deepest depths in no time?!" 

"Come to think of it, this dungeon only goes down to the thirteenth floor, right?"

When things got to this point, it did start to feel a bit lacking. I wished there were about ten more floors.

"What do you think, everyone? Since we've made it this far, shall we go all the way to the deepest level?" 

"Hah?! What are you saying?! I've never heard of anyone completely conquering a dungeon on their very first attempt?!" 

"But with this momentum, we can probably make it to the very end." 

"No, absolutely not! The boss monster is waiting in ambush at the deepest sector!"

Ah, right, that was a thing. I recalled a fond memory of getting blasted away and having a terrible time against the Minosynchelus that played that role in the training dungeon.

"The boss of this dungeon is a troublesome opponent that scatters poison and sleeping gas all over the place. If you don't prepare countermeasures against status ailments, it's going to be an incredibly brutal fight!" Gurka advised us with deep caution. Two different types of status ailments was definitely a nasty combination!

"I never would have dreamed that you lot would advance with such unstoppable momentum, so it's my fault for neglecting the preparations as well, but let's retreat for now. We can establish proper countermeasures and come back next time..." 

"We already have a status ailment immunity enchantment applied via Sex Boost, you know." 

"Huh?"

My [Pole Master] skills are incredibly convenient.

"Even if we happen to get struck by poison or sleep, I can use status-recovery magic, so it will be perfectly fine. As long as it isn't a curse, I can instantly cleanse absolutely anything!" Lady Staff, representing the [Cleric] class, spoke up with absolute confidence.

"Furthermore, my bikini armor possesses a sacred effect that deflects status ailments, so it's doubly secure! Our countermeasures are completely flawless!" 

"Dear me...!"

With that, having firmly resolved to challenge the boss of this dungeon, we surged straight into the deepest chamber...


And we defeated the boss without any effort at all.

"We did it! Complete conquest on our very first dive!" 

"Ehhhhhh...?!"

Raise the victory cry! Ei-Ei-Oh!

"This is all thanks to the advice you gave us, Gurka! You're the architect of this victory, Gurka! Thank you so much!" 

"I really don't think that's the case, though?" Even while responding to my handshake, Gurka remained a deeply humble person.

"The elite students of the Royal Capital truly are extraordinary. For an adventurer to possess this level of capability, a C-rank placement would be an absolute guarantee at the minimum...?!" 

"We are still just greenhorns in the middle of our studies." 

"That's exactly why I'm saying it's terrifying. Granted, your methods are completely out of this world...!"

Indeed. Gurka looked entirely exhausted from a constant state of shock; no matter what I said, she could only muster a thoroughly drained expression.

"Now that the boss is dead, our business in this dungeon is finished, so let's head back. ...No, seriously, please let's go back. Even if you lot fully recover every time you have sex, I'm the one who's completely exhausted here. Emotional fatigue...?" 

"Thank you for your hard work."

She had surely been keeping her nerves taut the entire time, constantly worrying about our safety.

"By the way, now that we've defeated the boss, what will happen to this dungeon moving forward?" 

"As for the boss, a new one will spawn right after it's defeated, so there's no need to worry. I don't know the mechanics behind why it happens, but unless you completely destroy the dungeon core, boss monsters will infinitely repop. You lot entered a training dungeon managed by the academy before, right?"

Yes, we did.

"The core of that place has already been destroyed, so it normally should have vanished entirely, but apparently they used some sort of special technique to preserve just the outer shell of the dungeon. That's a highly anomalous case, so you shouldn't use it as a reference."

Normally, unless you locate and destroy the core hidden somewhere inside, a dungeon will continue to persist. It seems boss monsters, common mobs, and traps are immediately resupplied whenever they are destroyed.

Despite knowing that mechanism, humanity does not eagerly rush to destroy dungeon cores. As we learned in class, it is because dungeons yield phenomena and resources that are highly useful to mankind.

"Well then, that covers everything you can learn from this dungeon, so what will you do next? It wrapped up much faster than expected, so are you heading straight back to the Royal Capital?" 

"No, there are still a few things I'd like to study here, so we'll stay a bit longer. I'm thinking we'll secure a room at an inn in town tonight." 

"I see. In that case, if you need anything from tomorrow onward, feel free to call on me. I can't remotely say I've worked off the full amount of the reward I received from Whip yet."

Gurka was remarkably dutiful. I suppose that was her professional pride as an adventurer shining through.

"In that case, Gurka, why don't you stay in the same room as us tonight?" 

"Eh?" 

"We intend to indulge in a massive, decadent mess tonight as well, you see."

I wonder what Gurka deduced from those words? The intent seemed to get through perfectly; blushing furiously, she began to stammer in a fluster...

"You lot are truly unbelievable...?! You had that much sex inside the dungeon, and you still want to do it?! But I am absolutely not joining in, okay?! To have an older woman like me expose a sagging body in the midst of fresh, youthful girls like you would be nothing but an absolute embarrassment!" 

"You are still plenty young, Gurka." 

"That is absolutely not true! I am already a total old hag, an old hag!"


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