The Womb Ranking Protocol
We'll be conducting an examination to determine who can give birth to higher-rank characters!
The pregnant chair waiting at the entrance safe zone of the Hideout was far more imposing than expected.
Minji had already rolled up her sleeves and was enthusiastically assembling the machinery with practiced efficiency, setting up the delivery room.
Every time the massive catheter insertion device and precision monitoring systems clicked into place, the distinctive hydraulic hum of the machines filled the Hideout's air.
The moment that heavy mechanical sound echoed through the space, Dayoon, Eunseo, and Chaei—who had been scattered moments earlier—came running as if on cue.
Even Lolita Yeha, who had just finished having sex on the medical bed, and Goth Yeha, who had been resting, joined them. Every female in the Hideout gathered in front of the pregnant chair.
Their instinctive curiosity and desire for the newly introduced birth-exclusive equipment instantly heated the Hideout's atmosphere.
“Oh my, so this is that new-model pregnant chair? It looks really comfortable.”
Dayoon was the first to stroke the chair's leather.
She ran her hands over the luxurious texture, the ergonomically designed backrest, and the specialized restraints capable of firmly securing the limbs. Dayoon already seemed to be imagining herself seated on the chair, taking my cock and conceiving a child of Rare rank or higher.
“Daddy! Chaei wants to sit on that chair too, nya! If I sit there and nom-nom on Daddy's cock, does that make a baby, nya?”
Chaei clung to my arm with a bright smile. To her, the chair simply looked like a new toy for playing pregnancy games with Daddy.
Eunseo silently swallowed and stared at the chair. She, too, seemed eager to bear another of my children.
None of them bothered to hide their blatant desire to sit on that pregnant chair, get fucked by my cock, and get pregnant. The Hideout was instantly filled with the heat of females in estrus.
The different pheromones they emitted mingled together, creating a dense, mind-numbing atmosphere.
I tried to maintain a solemn expression while calming my twitching lower body.
“Everyone, calm down. Just because you want to get pregnant doesn't mean we fuck recklessly. The proper order is to use this chair first to check whether your bodies are ready for pregnancy and what rank of child you can give birth to.”
At my words, Minji set down the wrench she had been using and nodded.
“Taehun-ssi is right. While children born through the game system are random, a pre-examination with the pregnant chair lets us calculate the probability of how high a rank character your current eggs can produce right now. Of course, we can't determine the exact rank, but we can confirm whether the responsiveness is higher or lower than the mother's current rank.”
Minji seemed to view the chair not as a simple breeding tool but as precision system-upgrade equipment for securing stronger forces… yet she couldn't hide the love juices flowing between her thighs.
Just then, Lolita Yeha interrupted while operating a holographic panel.
“Damn… I'll have to sit this examination out. The sync between me and Goth keeps desyncing because of the earlier university system hack. It'll take time to run the recalibration protocol.”
Lolita Yeha's voice carried a hint of disappointment. She, too, had wanted to receive my semen and have a new child.
In the end, with the two Yehas sitting out, we decided to examine the remaining four to see who had the highest probability of conceiving a higher-rank child.
The examination method was simple: a protein culture fluid similar in composition to my semen mixed with contrast agent, injected into the vagina via catheter. We would observe how intensely the eggs reacted to this pseudo-semen while visually monitoring egg activity on the monitor through the contrast agent.
“None of you have used the pregnant chair before, right? I'll demonstrate first.”
Minji sat on the pregnant chair without hesitation. The moment her hips touched the seat, the chair responded with a cold hydraulic sound and activated.
“Clank, clank!”
The waiting mechanical restraints snatched Minji's slender arms and ankles, forcibly securing her to the chair. A mechanical arm extending from beneath the chair pressed the Take Off button on her Cyber Suit.
The moment the Cyber Suit was stripped away, Minji was left completely exposed, wearing only the thin doctor's gown draped over her. Her toned thighs and intimate areas were laid bare without mercy beneath the blue light of the high-intensity sensors hanging from the ceiling.
With Dayoon, Chaei, and Eunseo's gazes focused on her, Minji was fixed in a shameful state of full nudity.
“Examination protocol initiated. Catheter insertion and precision scan commencing.”
The moment the system's dry AI voice fell, a thick, smooth metal catheter rose from between Minji's legs. The massive catheter, as thick and heavy as my own cock, aimed at Minji's narrow entrance without even a drop of lubricant applied.
Then, without the slightest hesitation, it was driven deep into her vagina.
“Nngh…! Haa, ugh!”
A moan Minji couldn't suppress escaped her lips. Designed to inject pseudo-semen all the way to the deepest part of the uterus, this enormous metal mass filled her vaginal walls completely and mercilessly penetrated her. The cold sensation and overwhelming volume—nothing like a human cock—made Minji's sensitive vaginal walls convulse wildly.
Minji's pelvis, bound by the restraints, trembled faintly as if resisting the mechanical intrusion. The moment the catheter passed her vaginal entrance and touched her most sensitive cervix, her eyes rolled upward, unfocused.
She had orgasmed. The mechanical stimulation, striking different nerves than when my cock penetrated her, had sent her insides into spasms.
“Haa… haa… As you can see… when the catheter is inserted… internal temperature rises due to frictional heat… and vaginal pressure is calculated in real time… calculated. Watch carefully… ngh…”
Minji tried to continue her explanation while pointing at the graphs on the system monitor with trembling hands. But her entire body beneath the doctor's gown was already drenched in cold sweat, emitting a strange sheen.
When the nozzle at the catheter's tip opened and the thick, hot mixture of pseudo-semen and contrast agent began spraying into her uterus, Minji's waist arched tautly. The unfamiliar sensation of the fluid filling her womb and pressing heavily against her lower abdomen made her toes curl straight.
“Minji-unni… are you feeling it right now, nya? Even Chaei can see your pussy twitching and clenching around that dildo, nya!”
Chaei, watching the scene with great interest from behind, spoke in her characteristically innocent voice.
Minji suppressed the moans threatening to burst out and answered while breathing heavily.
“N-no, I absolutely didn't feel anything… This is just… a mechanical resistance value from foreign object insertion… haa, ugh…”
Her red hair clung to her sweat-dampened cheeks, and her face was flushed with pleasure. Though Minji verbally denied it, her lower body honestly convulsing in time with the catheter's movements was clear evidence that she had already surrendered to the steel cock.
After Minji's intense demonstration ended, the catheter slowly withdrew with a heavy mechanical sound. The metal surface of the smoothly extracted catheter was coated in sticky strands of Minji's transparent love juices mixed with blue contrast agent.
The eyes of the watching females sparkled even brighter at the sight.
Next was Dayoon. With the experience of having given birth, she sat on the chair with composure. But that relaxed expression subtly changed the moment the restraints secured her wrists and ankles.
The system mercilessly pushed the thick catheter into Dayoon's depths. With a clanking sound, the metal mass forced its way through her entrance, and Dayoon accepted the foreign sensation as if accustomed to it.
However, just before the pseudo-semen and contrast agent were injected, a faint high-frequency vibration emanating from the catheter body began scraping against Dayoon's sensitive inner membranes, and the situation changed.
“Nngh… hng… uuuugh!”
A moan Dayoon had been holding back finally burst from between her confident lips. She had thought her once-stretched insides from childbirth would adapt quickly, but the sensation of something as thick as my cock directly striking her cervix while vibrating was unbearable pleasure.
Forgetting her shame, Dayoon thrashed against the chair, her thighs trembling.
“Ah!! Big Mama, it looks like you're feeling it now, nya! You moaned louder than Minji-unni, nya!”
When Chaei pointed it out without tact, Dayoon's cheeks flushed bright red. Dayoon slightly pursed her lips and answered while catching her breath.
“Haa… yeah. It feels pretty good. It's a different… mechanical feeling than a cock. The inside of my belly is tingling so much… I don't want it to stop.”
Dayoon had ultimately admitted her own pleasure. When the fluid injection reached its peak and she could no longer hold back her moans, the catheter's vibration finally stopped. In the place where the machine had withdrawn, Dayoon's pussy was left visibly twitching, drenched in love juices, with a lingering ache.
Next was Eunseo's turn. The moment the catheter penetrated Eunseo's depths, she let out an unrestrained scream, dignity be damned.
“Aang! Ah! It's hot… my pussy is so hot inside…! Daddy, I think I'm gonna come…! Uuuugh, save me!”
Bound by the restraints, Eunseo thrashed her hips wildly and surrendered her body to the machine. Every time the contrast agent swept through every corner of her uterine lining, Eunseo's pussy convulsed uncontrollably, clenching the catheter as if trying to crush it.
While Dayoon had elegantly succumbed to the rhythm of the faint vibrations, Eunseo completely crumbled before the primal destructive power of that overwhelming volume.
“Switching to forced restraint mode.”
Along with the system's warning tone, the restraints pressed even harder against Eunseo's body. From this point, Eunseo was no longer in her right mind. She cried out “I'm coming! I'm comingggg!” dozens of times, her toes curling straight. In the end, before the pseudo-semen injection was even complete, Eunseo experienced five or six intense orgasms. The pregnant chair was soaked with the cold sweat and love juices Eunseo had poured out. With a dazed expression, tongue slightly lolling, Eunseo panted heavily and passed the baton to Chaei, who was next.
Chaei looked scared once she was actually seated on the chair. But the restraints didn't wait for her hesitation. With a mechanical whir, the catheter forced open Chaei's narrow entrance and pushed inside. When her entrance—much thinner and more delicate than her mother or sisters'—was stretched wide by the massive metal rod, Chaei began whimpering, tears welling in her eyes.
“Huuuueeet…! It hurts! Daddy, this is too thick, nya! Chaei's pussy feels like it's gonna tear, nya!”
Struggling with her slender limbs bound by the restraints, Chaei let out a pitiful sound. But the pain was fleeting. The moment the catheter tapped against her cervix deep inside and the faint vibration signaling the start of injection began resonating through her entire vaginal walls, the situation changed rapidly.
The whimpering cries instantly transformed into a nasal, thick moan, and a hazy, distinctly female aura began clouding her innocent face.
“Nyaaang nyang nyang nyang nyang! It's hot! My belly's getting hot, nya! Daddy, this feels good, nya! Chaei's pussy is getting raped by a machine cock and moaning nyaaang, nya!”
Chaei now seemed to have forgotten the pain entirely, openly rocking her hips and savoring the mechanical pleasure the catheter provided. Her vaginal walls convulsed, greedily sucking and clinging to every segment of the catheter just as they did when swallowing my cock. In this moment, Chaei was the very embodiment of a female who converted even pain into supreme sexual pleasure through calculation.
Chaei received the pseudo-semen the catheter pumped into her womb, climaxing violently three or four times before the examination concluded.
After all examinations ended, the Hideout's air was thick with the dense scents emitted by the four females. The pregnant chair system began calculating pregnancy rank percentages based on vaginal pressure, internal temperature, and egg reactivity. Complex geometric graphs and numbers poured down like a waterfall across the holographic screen.
“Calculation complete. Reading fertilization compatibility and gene expression probability results.”
The system's dry mechanical voice echoed, and in the moment everyone's breathing stopped, the final result displayed massively in the center of the screen.
Result: Kim Minji judged as optimal pregnancy body with 85% probability of giving birth to R (Rare) rank or higher character.
Chaei pouted as she looked at the overwhelming 85% figure. Minji smiled leisurely the moment she confirmed the result window. Adjusting her doctor's gown, slightly disheveled from sweat, she spoke as if consoling the other females whose disappointment was obvious.
“Hehe, I told you this result isn't permanent, didn't I? It changes depending on your ovulation cycle and system condition, so don't be too discouraged. Let's aim for the next opportunity.”
Though she said that, Minji's voice was full of confidence. She walked toward me with confident steps.
“Alright, Kim Minji. Shall we go to the bed together? I'll fill your womb with my semen.”
I wrapped my arm firmly around Minji's elastic waist and headed toward the inner room where the medical bed was located. Behind us, Dayoon's jealous gaze, Eunseo's envious sigh, and Chaei's whining—“Daddy! I want a baby too, nya! It's unfair that only Minji-unni gets one, nya!”—faded into the distance.
I roughly stripped Minji's clothes away, fully prepared to pour everything into her depths.