The Joy of Being Penetrated
Following her overhaul, Yuria’s daily routine changed dramatically.
Aging components had been replaced, granting her sharper sensory perception and clearer cognition, altering the texture of everything she experienced. Her baseline logic remained mechanical—loyalty still took precedence over self-awareness—yet even that rigid framework was steadily derailing each time she found herself wrapped in his embrace.
"Yuria, finished calibrating the golems?"
"Affirmative. In accordance with your instructions, the golems' updates have been completed based on the revised algorithm, Master."
"Good, good. That's one more step forward for our dungeon. Now that today's duties are wrapped up, go get cleaned up and come straight to my bedroom, will you?"
"……Are we doing it again?"
"A man's got to relieve the pressure when it builds up, you know."
He had taken her into his bed before, but ever since the modifications, the summons had grown noticeably frequent. Unable to defy his orders, Yuria reluctantly made her way to his chambers, continuing her unwilling service by caressing his body.
"Is the pressure adequate?"
"Oh yeah, feels great. Your breasts are softer than before, so being rubbed like this is amazing. It'd be even better if you licked me a bit while doing that."
"……Did I not already service you with my mouth?"
"Having my cock wrapped between your tits while you suck the tip is a special treat, you see."
An utterly incomprehensible act. Were men truly creatures who achieved erections simply by viewing a woman's naked form and derived pleasure from being touched? No—at least none of the men she had encountered before him possessed such a constitution. This phenomenon was unique to him, or to those exposed to the aphrodisiacs he concocted. In other words, he was the root of it all, and her descent into this predicament stemmed purely from the misfortune of being reawakened by his hands.
"M-Master. The pussy you desire is ready here. Please… partake of this meager feast I have prepared to your heart's content……"
"Ngh, yes! That begrudging compliance while you look totally mortified is simply the best~"
"N-Nghh……♥"
Despite her inner reluctance, Yuria took him inside her of her own accord. With each encounter, the unwilling rhythm of her hips consoling his shaft grew increasingly proficient.
"Haa, ngh…… M-Master. Is it… to your liking? My… pussy…… Mnh, aah~♥"
"Yeah~ You're getting better at sex by the day. Is this what it feels like to hold a top-shelf real doll?"
"I do not know what a 'real doll' is, but…… if you are satisfied, I am honored……♥"
Thwack, thwack, squelch!
"Ah, ahhn~♥ M-Master! If you thrust so suddenly……♥"
"Sorry, but your cunt's clamping down so perfectly that I can't hold back. Can I have your lips?"
"……Mmh, nph~♥"
Locked in a heavy, wet kiss, their bodies collided in relentless rhythm. The faint shivers coursing through her limbs had to be a reaction against the act itself. Surely, that was all it was.
"Haa, ahn, haah~♥ It's… getting rougher……♥"
"You're soaking wet and clenching down hard inside, Yuria. Does my cock really feel that good?"
"It does not… feel good. Something like this…… It is only because it is Master's command that I comply……♥"
"You're not fooling anyone. You're gripping me like a vice just from me stroking you."
"No… this is not… my will……"
Smack, smack!
"Ah, oooh, haah~♥ I-It's swelling up inside meee……♥"
"Ngh, Yuria! I'm coming inside!!"
"N-No, I can't take any moreee~~♥♥"
Thick spurts flooded her depths, Yuria's frame trembling violently as the ejaculation washed through her. As the post-climax lethargy set in, she sagged limp in his embrace. He planted a gentle kiss on her cheek, murmuring softly.
"Heh, did it feel that good?"
"……It did not… feel good. Not… this♥"
"You say that, but you're wearing an awfully blissful look on your face, aren't you?"
"My… expression……?"
Her own face was something she could never behold without a mirror. While she pondered his words in bewilderment, he stroked her cheek with tender warmth, offering high praise.
"Yeah. You look really beautiful right now."
Beautiful. A word that had no place describing an instrument utilized merely out of utility. To hear it directed at herself was utterly foreign to Yuria, who identified strictly as a tool. Yet the moment the word fell upon her ears, a strange heat rushed to her cheeks, and a flutter seized her chest.
"……I know nothing of such things."
Thump, thump.
The core engine serving in place of a heart thudded violently. The tool, having never comprehended emotion, could not decipher the distinct sensation—a response far too vivid to dismiss as a mere operational glitch.
Indeed, she had felt it often whenever she was near him. Her internal power circuits accelerated in his vicinity, and whenever their flesh merged, her core hammered and her cognitive processors overheated.
Could this be what they call emotion?
At first, she had classified it as mere revulsion and wariness. The acts he engaged in fell far outside her intended functions, and the phenomena resulting from them plunged her into states of chaos and loss of control. Yet as the encounters accumulated, she came to understand that his actions did not cause her harm. More than that, impulses of active compliance had begun stirring within her. It could no longer be defined as sheer contempt or disgust.
At its core, it was not repulsion, but gravitation.
With each intimate act, she felt herself inexorably drawn toward him—and a very similar phenomenon was playing out right before her eyes in her immediate surroundings.
"Hey, Catherine! How many times have I told you not to cause trouble?!"
"Kyaah~ I'm so sorry! Forgive me just this once, and I'll never do it again!"
"You said the exact same thing last time before pulling this stunt again, you wench! That's it—hand over that pussy right now!"
"Eek~! The boss is jumping me~!"
Smack, smack, thud! Splat, squelch, spurrrrt!
Tirelessly provoking him only to be thoroughly ravaged, Catherine lay soaked in semen. Yet during the lingering aftermath, her face was painted with an unadulterated expression of bliss and ecstasy.
"Ehehe~♥ The boss is bursting with energy today too~♥"

"Ah, taking a living cock really makes me feel alive compared to fingering myself~ How should I rile up our dear boss next time, I wonder~♥"
"……."
"My, Yuria. What are you doing over there? Don't tell me you're sexually frustrated too? Do you want the boss to thoroughly ravish you?"
"Negative. That is not the case."
"Oh, come now, don't be coy~ Every time I pass by the room, I hear him plowing you with absolute fury!"
Catherine approached with sparkling eyes, looking almost envious. Burdened by the intensity of that gaze, Yuria took a step back, but Catherine paid it no mind as she pressed for solidarity.
"You prefer being hammered rough rather than gentle too, right? Getting slapped around and choked while taking it deep~"
"Negative. I……"
"Oh dear~ Are you going to pretend none of it happened after receiving so much love? That won't do at all~ Not if you claim to be the boss's maid while disregarding his goodwill."
"……Goodwill?"
"Well, of course! Sex is an act meant to make both parties feel good, isn't it? It feels foreign only at first, but in the end, it delivers pleasure that makes your whole body shiver. How could the boss's generosity in providing that ever be a bad thing~?"
Sex generates pleasure, and pleasure is by no means evil.
Catherine's assertion struck Yuria as deeply bizarre. Before meeting him, she had never experienced sensation remotely akin to pleasure, leaving her without the baseline data to judge whether it constituted a positive or negative state.
"……To be frank, I do not understand."
"You don't understand? What don't you understand?"
"Every time I engage in the act with Master, I feel as though my former self is being erased. Whether embracing this is correct, or whether I ought to resist…… Unaccustomed as I am to such matters, I have been unable to reach a conclusion."
"Hmm. In short, pleasure itself is so unfamiliar that you're having trouble accepting it?"
"Affirmative. In that regard, I find myself envious of you, Catherine. Unlike when you first arrived, you now completely embrace your encounters with Master."
Envy. An emotion she had certainly never possessed prior to their encounter. As she awoke to feelings one by one, an encroaching anxiety welled within Yuria's chest. Dolcetto had considered the emergence of emotion a desirable development, yet she feared whether accumulating feelings upon her rigid core was truly the right course, even dreading the transformation.
"Hmm, is that really something so grand as to warrant envy?"
Had she failed to grasp the weight of Yuria's dilemma? Catherine wore a nonchalant pout at the grave confession, continuing with a casual shrug.
"I mean, if you're alive, wanting to do what you feel like doing is just basic common sense, right?"
"Wanting… to do what one wishes?"
"Well, demons like me are all about fulfilling desire. If there's something you want to eat, you stuff your face; if there's something you want to take, you grab it until you're satisfied…… Unless circumstances forbid it, if there's no reason to turn down pleasure, embracing it honestly is the happiest way to live."
If there is something you wish to do, do it as long as circumstance allows……
A reckless operational doctrine driven by sheer hedonism and nerve, typical of a succubus. It was precisely why she never hesitated to provoke the employer holding her leash at every turn—knowing full well that the sadistic retribution he dished out catered exquisitely to her masochistic cravings.
"Though, watching you, Yuria, something crossed my mind…… You've never actually asked the boss for anything, have you?"
"Demands are out of the question. As a maid who serves the Master, I bear only the duty of attending to him……"
"Good grief, a life spent purely serving others? How do you live like that without dying of boredom?"
Catherine shuddered in dismay. But as she spoke, an idea seemed to strike her, and a sly, meaningful grin spread across her lips.
"Wait, maybe that's your desire after all."
"My desire……?"
"I mean, at your core, you view 'serving the boss' as your entire reason for existence, don't you? In other words, making the boss happy is the very thing that fulfills your deepest wish."
"……Is that how it works?"
Serving a master was merely the role and duty of an instrument. Could such a hollow imperative truly be dubbed her own desire?
"If you're not sure, it wouldn't hurt to experiment. If you can't focus on the act with the boss, start by achieving what you want most, step by step. Who knows? Once you taste that sense of fulfillment, you might be able to fully embrace the pleasure he offers you."
Humming a jaunty tune, Catherine offered that parting advice and sauntered off. Left alone in the quiet corridor, Yuria mulled over the concept of "her own wish," sinking deep into contemplation.
My wish…… My reason for being……
A tool existed solely to bring satisfaction to its owner. Catherine had framed that dedication as a form of desire, suggesting that fulfilling it might help her accept the pleasure derived from their encounters.
Fulfilling Master's desires is my joy…… If so, what does Master desire?
Yuria analyzed the parameters of her master's objectives. The foremost goal was the prosperity of the dungeon: harvesting massive volumes of Negative Energy, expanding the facility, and elevating their standing within the Demon King's Army. Beyond that, he clearly derived sexual pleasure from copulation. To please him, she reasoned that she needed a deeper understanding of the carnal sensations shared between male and female.
No. Merely continuing as I have is insufficient. I must devise methods of my own accord to bring Master greater pleasure……
Rather than passively obeying his demands, she would formulate a strategy to delight him through her own initiative. Naturally, her mind turned to the sensation termed 'pleasure' that overtook her whenever he took her. If the act of joining genitals caused mind and body to spiral beyond control—a state defined by him and Catherine as pleasure—then it was only fitting that she seek a way to bestow that same ecstasy upon him.
Master made me experience pleasure using a phallus. Therefore, I must……
Her logic brought her straight to the golem deployment sector.
Surveying the autonomous units she had been recalibrating with her own hands, Yuria's gaze locked onto the attachments fitted to their lower torsos. Indeed, they were synthetic appendages modeled meticulously after his male anatomy. Initially, she had equipped them to violate male adventurers in order to harvest Negative Energy. But upon deeper deduction, this was undeniably an effective instrument for delivering intense physical stimulation.
Penetration equals pleasure. Ergo, Master will also experience pleasure by being penetrated.
Men possessed fewer orifices than women, but they had one nonetheless. Utilizing that opening would surely yield identical sensations. With that deduction reached, Yuria picked up a thick, elongated dildo Bertin had gifted her previously, her mechanical expression turning deadpan and solemn.

I shall master the method of pleasing men with this. And when the time is right, I shall bring Master joy through my own initiative……
Just as he had imparted the joy of being penetrated unto her, she resolved that, given the opportunity, she would teach him the sheer pleasure of taking it from behind. With this newfound mission awakening within her logic circuits, a radiant, purposeful glow ignited in her once-empty eyes.
"So, Yuria. Why are you having our golems plunder the ass of every single male adventurer who steps into the dungeon?"
"Because I concluded that doing so converges with Master's deepest desires."
"What kind of deranged logic leap made you think that's what I wanted?!"
Even if our golems were humanoid models, strapping dildos to every last one of them and sending them to ravage every male intruder's rear was beyond absurd. I was struck utterly speechless by her deduction, but Yuria maintained her deadpan stance without flinching.
"Based on a comprehensive synthesis of my independent analysis, humiliating male adventurers serves the future of both this dungeon and Master. In practice, violating them following their defeat generates significantly more Negative Energy than striking them down in ordinary combat, does it not?"
"I mean… technically, yes, but……"
"If energy efficiency is maximized, a Dungeon Master has no logical grounds for refusal. Should the visual feed prove distasteful, I recommend redirecting the surveillance cameras during those intervals."
Was this a side effect of her recent overhaul? Lately, she had been voicing her own opinions with striking assertiveness. Considering it might be a sign of positive development, I found it hard to simply scold her. Just as I was pondering this, Catherine, who was monitoring the surveillance feeds, leaned over toward me.
"Boss~ We've got a new intruder~ It's a female adventurer this time~"
Turning my gaze to the monitor Catherine pointed out, I spotted a woman on screen. Dressed in light, agile gear, the suspicious air clinging to her frame made it readily apparent that she specialized in illicit trades.

"A female thief this time, huh? Her chest might be modest, but petite girls have a charm all their own."
After having my eyes thoroughly assaulted by Yuria's golem sodomy squads lately, this was going to be a much-needed breath of fresh air.