BAD ENDING 001: Slave Walker Sonia 1
There was no room for choice. In Sonia's mind, the word refusal had long since become nothing more than a corrupted fragment of data, stripped of all meaning.
The very attempt to recall that word had become an inaccessible region—one that triggered a system error on contact.
The word favor that left Peko's lips passed through the thought circuits of a Sonia already reduced to a Slave Walker Unit. Each soft syllable transformed into a sharp data signal and drove itself straight into her brainstem as an absolute command.
Her reason fell into paralysis before it could even analyze the meaning, while her body's instincts screamed with pure craving for obedience alone.
"Yes. Master…♡"
The answer that spilled from Sonia's full, red lips held not a shadow of humiliation or resignation. Instead it was filled with pure rapture at the unknown experience about to unfold, and a thoroughly soaked anticipation. Her voice, laced with hot, damp breath, made the cold, dry air inside the Walker tremble ever so slightly.
Just the sensation of her Master's will being realized as sound through her own vocal cords sent a thrilling shiver racing down her spine.
"…If you're all right with me, I'll help. Master. Please give me your orders…♡"
With her cheeks flushed crimson, Sonia bowed her head toward empty space—as if her Master were actually standing before her, reigning over her. Her voluptuous, heavy breasts swayed with gravity, and her nipples—already stiffly erect from the reward—brushed against the cold metal floor, transmitting a sharp, sweet sensation straight to her brain.
Her initial thoughts had been different. A sense of duty to help Peko, who had saved her from danger, and her sister Milli. Practical calculations about expecting additional compensation as a D-class hero of Sky City. Those thoughts had changed as she grew accustomed, in the cold space of the Slave Walker, to the pleasure-laced command signals that pierced her body against her will.
Sonia's perception began to twist from its very foundation.
"…Thank you so much, Sonia. No. Would it be all right if I call you 'Slave Walker Unit Sonia' for now?"
Peko's voice was gentle, but the meaning contained within was a declaration that completely redefined Sonia's existence. The act of overlaying the functional designation Slave Walker Unit before the personal name Sonia. It was the complete erasure of her personhood—an indelible brand marking her as a tool.
"Yes, Master. Whatever name Master calls me is my name… Hnn…♡"
At Peko's announcement, Sonia's body trembled with joy. The fact that her name was being newly bestowed by her Master strongly stimulated the masochistic desire hidden in her deepest depths. Between her thighs, another shameful proof gushed forth, widening the small puddle already formed. The fluids pooled thickly on the metal floor testified to Sonia's wretched state.
"All right then. Slave Walker Unit Sonia. I'm counting on you."
Just until Master and Milli… until Master's precious Slave Walker Unit returns safely to the base… I'm only serving…♥
Sonia rationalized her actions that way. Her body already knew the truth—that this experience was by no means temporary help. That the pleasure of this submission was a poison that, once tasted, could never be reversed.
Slave… A slave. A living component created solely for the efficient control of a combat Walker pilot. Slave Walker Units, filled by criminals and social malcontents. Units for which volunteers were woefully insufficient, and for which the physical and mental conditions required were extremely stringent.
Master said… she was counting on me, a hero… Being able to please Master… being able to satisfy Master's expectations… Slave Unit Sonia is… so very satisfied…♡
"I'll input the coordinates. If you keep heading outside the city from here, you'll see the military base. It's still the middle of the night, so just go as you see it. I'm counting on you, Slave Unit Sonia."
"Yeees… as Master commands."
When Peko operated the control terminal, new information appeared over the yellow contact lenses that filled Sonia's field of vision. A green line was drawn in the air, displaying the optimal route toward the base. Like a collar fastened by her Master, that line gave Sonia absolute peace of mind.
"Shortest distance, main-road route review… match. Proceeding to the Slave Walker base management office you input."

From Sonia's mouth flowed a stiff, mechanical report. Her thoughts were growing ever more synchronized with the system. The emotions of human Sonia were vanishing, leaving only the functions of core unit Sonia, who rode the Slave Walker.
Master… Aah… Master…♡ Forgive the rudeness of even thinking the name Peko in my heart…♡ Master… what a wonderful name… And I who serve such a Master am Slave Unit Sonia…♡
According to Peko's explanation, the control core fitted into Sonia's lower connection point—her lewd pussy—along with the sedation patch on her forehead and the additional fixation patch attached to her thigh, guided her mind toward a mindset suitable for a Slave Unit. The principle of gradually erasing individual selfhood, leaving only the senses of a Walker Unit, and castrating any spirit of resistance. To the current Sonia, even such an explanation was unnecessary. As Master's Slave Walker Unit, she was ready to follow any instruction at any time, so she felt no problem at all.
Rather, she thought that the act of moving to the location Master had input was the most glorious path of contributing to Sky City as a Slave Unit. A Slave Unit had no rights, but instead only needed to follow the instructions Master gave. Without needing to think, without needing to worry. Just follow… and then…
"Hyaaang~♡ Master… Master… Master…♡"
"Sorry, Slave Unit Sonia. Did that hurt?"
Just now, Peko had pressed the reward switch again. Naturally, the place where the reward was applied was the lewd, pathetic pussy of this simple Slave Walker Unit who could do nothing without her Master.
Following Master's command, Sonia reported her sensations honestly, without needing to think.
"It's trembling and… thrusting deep inside my womb… and it feels good… Really… it feels like I've become a real Slave Unit managed by a Slave Unit management core… I'm so happy…♡"
"Good. That's a relief. But Sonia, if you're a Slave Unit inside a combat Walker right now, shouldn't you be answering differently?"
At Peko's quiet correction, Sonia's mind snapped alert. That voice stabbed into her pleasure-drowned brain like cold ice.
"…Ah! …Yes! Understood, Master! I'm sorry! Slave Walker Unit Sonia is currently climaxing from Master's reward and feeling the emotion of joy!"
Ah, a mistake… I made a mistake. Me, Master's capable Slave Walker Unit… making such a big mistake… Right now I'm not something "like" a Slave Unit—I'm a perfect Slave Walker Unit built into the Slave Walker… a component…
Guilt washed over her in waves. At the thought that she had failed to properly respond to the mercy and reward Master had bestowed, Sonia felt like a defective product that deserved to be discarded.
"I'm sorry, Master. Could you please re-adjust the thought circuits of lewd Slave Walker Sonia? I propose raising the self-control stage by one more level, Master."
"Sorry, Sonia. That won't work. It's not that I don't want to—if I raise the stage too much at once, there could be side effects. It's absolutely not because I dislike you, so don't misunderstand. You've been doing really well so far. Here, a reward. Reward."
Press. Master pressed the reward button again. An electric pulse designed to subdue rebellious units with pleasure was released from the control core, striking directly toward Sonia's cervix.
"Th… thank you… Master…♡"
"More importantly, how about your forehead? Not itchy? The current thought-regulation stage is Stage 1. Even if I want to raise it to Stage 2, I'd have to take you to the base management room and show you to a mechanic. Bear with this until then. Here, reward button."
"Hwaaaang…♡ Yes… yeees… But Master… a Slave Walker Unit doesn't even have the right to endure…♡ Please give me instructions…♡"
Sonia thought of the new device attached to her forehead. At first she had been flustered by the instruction to press a pointed crystal firmly against her forehead, but thinking about it now, that reaction had been so shameful. Failing to respond immediately to Master's instruction—she would have nothing to say even if she were disposed of as scrap.
Every time she spoke the word Master, the thought-circuit control part attached to her forehead seemed to activate, injecting happiness directly into her brain's pleasure center. That sensation was as sweet as a drug, making Sonia want to keep calling for Master.
"Route change fifty meters ahead… Master approval not required. Changing route."
Having discovered a fallen street tree on the road, Sonia naturally corrected the path using the limited autonomous thought authority Master had permitted her—just like a well-trained machine.
"You're doing really well, Sonia. Just keep going straight, right? You're doing so well. So well that it's like… you were born to become a Slave Walker Unit."
"Yes, Master. No directional changes are anticipated on the remaining route. Thank you for praising this lewd masochistic aptitude body. Next time, as Master's Slave Unit, I will strive even harder to receive more praise. Thank you so very much… Master…♡"
At Master's praise, the crystal on her forehead vibrated minutely, secreting pleasure chemicals in her brain. Sonia fell into enormous happiness. The promise that once they arrived at the management room, after her aptitude was confirmed, she would put on a pilot bodysuit and be modified into Master's second Slave Walker Unit—that was the finest future for Sonia.
"Whew… Once we get this far, I can relax. No need to explain in more detail. You don't have to move every little bit like you have been. I'll switch to auto-drive mode, Sonia."
"Yes, Master. Switching to auto-drive mode."
With those words, the real-time pairing connected to Sonia's arms and legs was cut. The four-legged combat weapon began moving toward its destination on its own, without Sonia's movements. Sonia was no longer a component that piloted the Slave Walker—she was merely cargo to be transported by the Slave Walker.