It had been three days since the incident with the titan-class Shuuki.
After teaming up and taking it down, thankfully, no other Shuuki had shown up. Not even the smaller ones.
Kyouka was informed shortly afterward through a special device—one of the few capable of transmitting signals through the fixed Mato gates.
Now, for the uninitiated, Gates are what we call the entrances to Mato. Some are fixed in place, and others spawn randomly without warning. There are nine official fixed gates in total, guarded by ten elite units of the Anti-Demon Corps. Technically, it's only nine units in function, since the Fourth Unit is... well, kind of a ghost division.
It's a superstition thing. In Japanese culture, the number four is associated with death and misfortune—shi (四) sounds like shi (死), meaning "death." So it's treated like a taboo. You won't even find "Unit Four" on the roster. It just doesn't exist.
Then there are the temporary gates, the real troublemakers. These pop up randomly, without warning, and cause all sorts of chaos—civilians pulled into Mato, or worse, Shuukis crossing over into the human world and going berserk.
I was one of those unlucky civilians caught in a random spawn—an event commonly referred to as a Mato Mishap.
And to survive, I had to become Kyouka-san's slave.
Not the kind of "fantasy slave" you read about in isekai worlds... though honestly, with how things turned out, it's not too different.
Thanks to the matriarchal society structure of this world, and the fact that men are a rare commodity, I somehow ended up with an actual collar on my neck. Permanent. Magical. Can't be removed until death. And it links me directly to the strongest woman I've ever met—Chief of the Seventh Unit, Kyouka Uzen.
Her ability is called Eternal Chains: Slave. It lets her enslave both monsters and humans. On paper, it sounds kind of messed up. Even her own peers considered the ability useless because it didn't grant her any combat boosts. No strength. No stamina. Nothing flashy.
But she didn't need it.
Because while the rest of humanity couldn't even scratch a Shuuki without Peach-enhanced blessings, Kyouka tore them apart with her bare hands—through sheer willpower and endless training. She became a monster-slaying legend without needing anyone's pity or gimmicks.
When I first became her slave, I didn't know all this. Back then, I just thought I was unlucky. Some other guy might have panicked or whined about "freedom" and "dignity." But me? I saw the silver lining. If society's invisible chains were already squeezing me dry, I might as well get the upgraded version—with real chains and waifus.
Because the perks?
They're heavenly.
Whenever Kyouka activates her ability, I transform into a humanoid Shuuki. More like a werewolf, actually—towering over normal humans, built like a demonic god. But not grotesque.
With Kyouka as my master, my skin turns bone-white, hairless, clean like polished marble. My body becomes shredded, veins tight under smooth muscle. Tribal tattoos light up across my chest, arms, and back. My fingernails extend into razor-sharp claws, capable of slicing through a Shuuki's flesh like tofu.
My shoulders widen so Kyouka can ride on my back like a commander, and the chain attached to my collar links us physically and mentally.
I don't even need verbal commands most of the time. I can feel her intentions—her instincts, emotions, urgency—as if they're mine. Like we're synced.
In this state, my strength, speed, and defense jump to a level just below that of a Chief. Problem is, I still can't fully control it. I'm new at this. Still figuring it out. A rookie with a nuke in his pocket.
But I'm improving. And the rewards?
Let's just say... they're better than any fantasy world I've read about.
And right now, I was about to earn another one.
•••
[In the middle of a desolate Mato crater—its rocky edges still glowing faintly from residual demonic heat—a man and a woman were tangled together.]
Their mouths moved with urgency, devouring each other like it was life itself. Lips pressed, parted, and pulled, sucking with soft, wet squelch sounds.
Chup... chu... slurp...
Their tongues met, twirling and pushing, until saliva spilled from the corners of their kiss and trickled down their chins.
Kyouka: "Nnn... mmnn~!"
[Her silver hair fluttered in the dead wind, strands clinging to her red cheeks. Her bare chest was flush against his, soft warmth rubbing against the boy's toned skin. Their nipples brushed, sending tingles up both spines.]
She trembled with a mix of shame and desire, cheeks hot, eyes slightly downcast—but her body clung to his unconsciously. Her thighs squeezed gently as his hands settled at her waist, his grip soft and unsure, like he was scared to break her.
But she felt it.
The subtle push of his hips. The heat pulsing against her skin. She was a grown woman—she understood what he wanted. And more than that, why she was letting this happen.
With a soft gasp, she slipped her tongue deeper, now sucking on his like a lollipop. Her lips formed a tight seal around it, drawing him in—slurp... slrp... pop...
Yuuki: "H-Haah..."
[His blue eyes widened, pupils shaking with arousal. Sweat clung to his black bangs as they stuck to his forehead. His chest rose and fell, rubbing against her soft curves.]
(His thoughts were a mess. Her body... her mouth... her scent—)
(Her nipples... her tongue... her breath...)
(Thinking) Is this really my reward...? She's... sweet. Like actual nectar. This smell... this warmth... I want to hold her tighter.
A strange possessiveness bloomed inside him, and his arms instinctively wrapped tighter around her waist. She didn't stop him. In fact, her hips pushed closer.
[This wasn't a dream. This was his reward.]
Earlier that day, they'd taken down another group of giant Shuukis. Not titan-class, but still towering—three stories tall and tough enough to crush entire teams if handled wrong.
And yet, they'd won.
Together.
Now, this...
Their mouths finally parted with a wet pop, a string of saliva connecting their tongues as they both panted in the quiet, broken only by the soft hum of wind in the crater.
It had become a regular thing lately—ecchi rewards after missions. Yuuki no longer hesitated to accept them, nor did he hold back from enjoying them.
Kyouka: "Y-You really are a pervert...!"
[She gasped, her tongue still peeking out slightly, a thin trail of drool gliding down her chin.]
Yuuki: "Hehe... If I'm getting a reward, I thought I might as well savor it."
[He grinned, reaching down to pick up her clothes, handing them to her with a soft smile.]
[His eyes lingered for a second on her stiff, pink tips... perky from the cold and arousal.]
Damn... I wanted to suck on them so bad.
[Kyouka quickly turned away, slipping her bra back on and snapping her uniform in place. Her body still glowed faintly with the afterheat.]
Kyouka: "Water your shirt... We're heading back. I need to report this."
[She reached down, adjusted her skirt, and picked up her military cap.]
Yuuki: "Sure, Chief~"
[He pulled his shirt on and followed behind her, footsteps echoing slightly in the hollow crater.]
[But his gaze lingered... on her back, her curves, the way her uniform clung to her hips.]
[He smiled quietly.]