Slave Walker
An organic core, responsible for posture adjustment and targeting assistance within a Slave Walker. Without even a specialized pilot suit, Sonia had climbed naked into the four-legged combat machine — a weapon the size of a car — her body stripped bare of every last hair.
Just moments earlier, Peko had forced her to press the electric-shock discipline button meant for rebellious Slave Walker Units. That chaotic moment, when two or more targets had appeared at once, had already been rewritten in Sonia's mind as a trial — a lesson from her Master that she was meant to endure.
The two calming patches stuck to her forehead had optimized her thinking perfectly to the system.
Behind the Slave Walker, in the path it had already crossed, a series of explosive cracks continued to ring out — the kind of sound that the old Sonia would have twisted around to investigate without a second thought. Now she did not so much as flinch.
With the lingering tingle still humming through the choker at her throat, and with Peko's words echoing in her head — I only give rough instructions. The judgment is yours — Sonia fixed her gaze solely on the nearest drone ahead of her.
She poured every scrap of her consciousness into staring it down, so the Slave Walker could lock on with perfect precision.
Aim… just keep looking… hnn…
A soft ping — then a sharp fwoosh.
The laser beam lacked the raw power of Sonia's plasma pistol, but it was overwhelmingly superior to any outdated ballistic weapon. The terrorist drone, its body cleanly pierced by the crimson ray, detonated limply in midair and scattered metal shrapnel across the sky.
Without giving Sonia a moment to hesitate, the Slave Walker shifted its gaze to the next drone with zero lag. A large red targeting reticle drifted toward the new mark, then contracted into a tight point the instant Sonia locked her eyes on it.
The yellow contact lenses covering her golden irises were perfectly linked to the Slave Walker's visual sensors, feeding her every scrap of data in real time. Thanks to that connection, the combat walker could acquire successive targets without a single flicker of hesitation.
This time she did not get distracted by ambient noise or wander off into idle thoughts. Sonia simply followed Peko's orders, methodically and precisely destroying the drones that had appeared over Sky City to carry out indiscriminate terror attacks, one after another.
Forward. To the right. Tilt your head up. Fire. Each individual command was delivered as a distinct sensory signal through the Slave Unit control core buried deep inside her slick, wet sex.
Ah… hnn…♡ Before, it just felt weird and foreign… but now… now it only twitches a little… and that twitching feels so good… like I'm touching myself… how do I even… wait… I… what am I suddenly thinking about…! I just want to finish this and go home and rest…
The rod-shaped control core shifted in tiny increments, dictating every action Sonia was supposed to take. The trembling vibration and the squirming foreign pressure inside her were, strangely, transforming into something increasingly pleasurable.
Without even realizing it, Sonia was experiencing a Slave Walker Unit's standard management protocol in real time.
Right now… I am not Sonia. I am the Slave Walker Unit installed in this machine… She nearly defined herself that way — but the last shred of reason belonging to a D-class hero of Sky City managed, just barely, to suppress the thought.
A soft click. A press. A firm push.
"…Eek!?"
That fragile balance shattered the moment Peko caught the pleasured moan that slipped from Sonia's lips. The tip of Peko's slender finger pressed a pink switch on the controller she held in both hands like a game pad. A faint heart-shaped engraving was etched into the button's surface.
If there was a blue discipline button for delivering electric shocks, then of course the opposite function existed as well. Where there was a system for punishing a unit that made mistakes, there was naturally a switch for rewarding one that performed well.
The Slave Walker system used slaves and criminals as components. They were no longer treated as human beings, but re-educated as parts of the machine. Even so, the combination of carrot and stick remained the most effective method for maximizing a unit's efficiency — which was why the feature had been installed.
"Hyaaah… ah… nn… ah…? …♡"
She was neither a slave nor a criminal, yet Sonia had become a Slave Walker Unit, crouched on all fours and handling the targeting. From the control core — which transmitted signals a beat faster than the choker around her neck — a languid, intense pulse of pleasure rippled outward in trembling waves. In that instant, Sonia's already feeble resistance melted away completely.
A gentle press. Confirming the area was secure, Peko tapped the pink heart button, and the inserted control rod unleashed trembling vibrations, micro-electric stimuli, and ultrasonic pulses that thoroughly ravaged the most sensitive walls of Sonia's insides.
Goosebumps rose across every inch of her smooth, fully depilated skin below the neck. Completely inexperienced with this kind of pleasure, Sonia could only sprawl on all fours with her mouth hanging open, her entire body puppeted by the shuddering control rod, as slick fluid dribbled steadily down between her thighs.
"Haaang…♡ Hyaaah… Pe… Peko… Miss… …Master… this… this is…♡"
Hnn… remarkable… Maybe this girl really does have a natural aptitude for this…
The way she faithfully obeyed the order to call her Master. The way she acknowledged her own mistakes and corrected them immediately. Peko felt a deep satisfaction watching Sonia through the monitor.
She had never seen a subject respond so receptively to the calming patches on her forehead. Despite voluntarily climbing into the walker, stripping naked, and assuming a dog-like, humiliating posture, Sonia showed no stress response at all — if anything, she was adapting to the system with perfect ease.
Peko found herself growing increasingly covetous of the girl. Watching Sonia willingly obey the degrading order to address her as "Master" had convinced Peko that this was a born talent — a stroke of luck she absolutely could not afford to let slip away.
"You're doing really well, 'Sonia.' A Slave Walker Unit that performs well gets a reward. One that fails gets punished. Keep doing this well, and I'll keep giving you rewards. Like this…"
"Hgaaah… ah… hah…♡ Y-yes… yes… reward…"
Another firm press. The pink heart sticker on the button — already peeling from how many times it had been mashed — was pushed again. The same wave of pleasure swept through Sonia's entire body. Haaah…♡ Heeh… eheheh… She drooled, spilling meaningless sounds.
Watching her, Peko began to imagine how much better her performance might become if they fitted her with additional equipment — a full-link visor helmet, a nutrient-supply tube, things like that. She started freely projecting her expectations onto the potential this girl named Sonia might one day display.
"If you understand, answer me. You already know what you're supposed to say, don't you, Sonia?"
"…Yes, Master. Thank you… for the reward…♡"
As Sonia's body trembled, the massive Slave Walker vibrated in subtle sympathy. Peko watched the sight with open satisfaction.
The more naturally Sonia came to recognize her role as a component of the Slave Walker, the more fluid her movements became, and the faster her targeting speed climbed.
As if to put that performance to the test, a new remote-controlled drone appeared in their field of view.
"They show up without even being asked. Shall we get to work, then? You already know what to do, right, Sonia?"
"Yes, Master. …Acquiring target. …Kill confirmed. …Nnh…♡ Thank you…"
Sonia's voice already sounded as though the previous reward had pushed her to her limit. Her body held a perfect standby posture, waiting for the next order without the slightest unnecessary movement.
Slowly, but with absolute certainty, Sonia was adapting perfectly to a sensation she should never have grown accustomed to.
"Left-forward. Move from coordinates 5.5.5 to 4.5.5."
"Yes, Master…♡"
Sonia no longer felt any resistance to moving on the commands of Peko — no, of her new Master. If anything, the pleasure that flooded her body every time she obeyed was pleasantly numbing her mind.
At first, the pleasure had only come when the reward button was pressed. Now her brain had begun to remember it on its own, generating the sensation simply from the fact of following her Master's orders.
Passing the wreckage of drones destroyed by the Slave Walker's laser beams, Sonia and Peko arrived safely at the edge of the affected district.
Milli still hung unconscious against Peko's back. Thanks to Peko's exceptional piloting skill and Sonia's performance — which, even without a dedicated pilot suit, had exceeded that of a regular unit — they had escaped the danger zone without taking a single hit.
The scene was still being cleaned up. Instead of the other heroes or adventurers Sonia had expected, only medical personnel bustled about, tending to the injured.
Civilians who had briefly panicked at the combat walker approaching from the opposite direction relaxed the moment they spotted the military rank insignia on Peko as she emerged from behind it, and returned to their respective tasks.
"Sonia. Good work. Come over here, will you?"
"Yes, Master."
The Slave Walker, which had earlier creaked and squealed with joint friction, now moved as quietly and swiftly as a machine that had just been freshly oiled. Like a giant pet dog approaching its owner's side, the walker came to a halt beside Peko and settled into standby.
…♡
Carrying out her Master's commands. That had already become Sonia's sole reason for existing — and the source of her pleasure.
Peko had seen straight through to the pure, lewd craving for subordination buried deep in Sonia's heart, a desire the girl herself had never even been aware of.
She briefly considered applying one more calming film sticker, then decided that drawing out voluntary submission would be more effective.
"…Sonia. Can I ask you for one favor? This isn't an order. It's a request."
"Yes. Please go ahead, Master."
"We made it out safely, but I told you earlier I was on leave, right? My assigned base is pretty far from here. It looks like other districts are under attack too, not just this one. Time is critical, and I want to go help… Please, Sonia! If you're willing, would you come with me? I'll vouch for your piloting skill. We haven't taken a single hit so far, have we?"
The Peko who had been looking down on her like a slave being trained was nowhere to be found.
Now Peko stood as a veteran pilot of Sky City, bowing her head politely to the D-class hero Sonia.
The sudden change in attitude left Sonia briefly dazed — but her body was still waiting for her Master's next command. Reflexively, she kept dripping wet around the rod buried in her sex.