Flashback: Aria's Descent into Leon's Sex Slave
Leon was born into an upper-class family with a mansion in the royal capital. Tracing back four generations, his ancestors included the great noble, the Lancaster Duke, but Leon's father from a collateral branch had long since lost his title and become a commoner.
That said, Leon's father was renowned as an exceptionally skilled Guardian, known far and wide as a man of impeccable integrity. He had even been awarded a knighthood by Her Majesty the Empress herself for his achievements.
Because of that, he placed great expectations on his son and daughter to become Guardians—but.
All Leon possessed was the Absolute Command skill, a shady ability if there ever was one.
His father was openly disappointed. The serious and strict man could never accept a skill that turned women into slaves.
His mother, siblings, and even the servants looked down on Leon. Especially once he hit around ten years old, the female servants kept their distance, terrified of being ensnared.
The lonely Leon had few family members who treated him with any warmth, and Aria was one of the rare exceptions. Originally an orphan, Aria had been adopted by Leon's father due to her immense talent as a Guardian.
This older stepsister was six years his senior, a delicate and beautiful girl. She had glossy black hair that she wore long and straight, and she favored cute, girly outfits.
As she grew, she developed into a tall, slender woman with distinctly feminine curves that made Leon's heart race.
"Hey, Leon? Wanna go out together?"
Aria often took Leon out to play. Famous sweets shops in the capital, theaters, fishing ponds... Everywhere was fun with her by his side. She was kind, beautiful, and doted on him endlessly.
To Leon, Aria was the ideal big sister. And as she matured, she also became a genius Guardian.
At the Aresford Imperial Defense Academy, she graduated top of her class and became the Sequence 1st student council president—a rare feat for someone not from nobility.
She even took second place in the Festival of Stars, where students from defense academies across the entire empire competed.
She was among the strongest of her generation. Aspiring to be like her, Leon dreamed of becoming a powerful Guardian himself.
But all he had was Absolute Command. He couldn't grow strong with a skill like that. Even if he could, would using it make him a Guardian who saved people through such underhanded means?
Aria gave him the answer when he was twelve. They were at a famous capital café, where she savored a slice of cake.
The eighteen-year-old Aria was already a full-fledged woman; even through her blouse, the swell of her breasts was unmistakable.
"This place's shortcake is the best, as always! Here, Leon, say ahh~"
"S-Stop, that's embarrassing, Aria Sis..."
"Oh? Have you grown up on me, Leon? But if you don't eat it, big sis will be sad..."
With no choice, Leon took a bite from the fork she offered. The cake was delicious, just as she'd said.
Aria narrowed her eyes, gazing at him with pure happiness.
"You know, Leon. You'll definitely become a strong, wonderful Guardian."
"You think so? All I have is Absolute Command... Everyone mocks me for such a filthy skill."
Aria gently stroked his hair.
"That's not true. Skills are gifts from the gods. There's no such thing as a filthy skill—if used right, it can save people."
"But..."
"Someday, a woman will offer her body and soul to you, and if you love her in return, use it on her then. There's nothing wrong with using it on a consenting wife, right?"
"I guess... But do you think someone would ever devote herself to me like that?"
"Of course. Because you're my adorable little brother."
She giggled, her expression so lovely... Aria was Leon's first love.
So, he wanted to marry her someday.
(She's my stepsister, so it should be possible...)
Aria loved him too. Even if it was sisterly love now, Leon yearned to be loved by her as a man.
But that wish, and their happy days together, were shattered one day.
Aria was nineteen, Leon thirteen. Fresh from graduating the Aresford Imperial Defense Academy, Aria shone in real combat as a Guardian, her name spreading across the nation. She captured countless anti-empire terrorists.
Yes—Aria had shone too brightly. A beautiful genius Guardian from commoner stock made her the perfect target for the anti-empire faction.
One night, as Aria and Leon walked the capital's streets, they were ambushed.
An anti-empire attack.
"I'll protect you, Leon—no matter what!"
Aria charged bravely. In her prim blouse and skirt, she displayed inhuman strength, but she was still just one girl.
Surrounded by a horde of men, she eventually fell.
Leon could only tremble in terror, watching helplessly. Dragged into an alley, they faced an anti-empire executive—a stunning, seductive silver-haired beauty, perhaps late teens or early twenties. She wore exotic dancer's garb that boldly exposed her ample breasts and hips.
She sneered down at Aria and Leon.
"What a letdown. This is the 'genius Guardian'?"
"P-Please, just spare my brother... Do whatever you want to me."
Even humiliated, Aria begged desperately to save Leon. Yet he could do nothing.
Regret burned in him.
"Hmm. Willing to do anything, are we? Then how about entertaining every man here?"
"...! At least not in front of my brother... please."
Leon understood what was coming. His sister would be gang-raped.
One man groped Aria's breasts from behind. "Nooo!" she cried, tears welling as she struggled.
But she was swiftly stripped bare—blouse, skirt, bra, panties all torn away.
She would have been raped right then.
But the silver-haired woman smirked sadistically.
"Oh, I just thought of something much more fun."
She cast magic at Aria. In an instant, the naked girl collapsed like a marionette with cut strings.
"S-Sis!"
"Don't worry—it's just sleep. But if you want to save her, you rape her."
"What?"
"Absolute Command, right? Honestly, I was more interested in that than Aria Lancaster herself. She's a woman too—she can be your little sex slave."
"I won't make my sister my slave!"
"Refuse, and you both die. And even if she wakes, don't say I ordered it. Pretend you just couldn't resist attacking her because she turns you on."
"W-Why...?"
"Because it's more entertaining that way."
Her words were ice-cold. The world held malice beyond Leon or Aria's imagination.
He had no choice. Defy her, and they'd die—Aria would be gang-raped anyway.
To save Aria, Leon had to violate her.
He mounted her body. He should have hated forcing himself on his sister, but he was unbearably aroused.
Stark naked, Aria was divinely beautiful.
He fondled her full breasts, kissed her moist lips.
Groped her plump ass, stroked her lower belly. Her body ignited his desire to dominate.
Aria moaned "Nnh..." now and then, but showed no sign of waking.
Leon's cock swelled harder.
His eyes locked on her secret place—her pristine slit exposed defenselessly, as if inviting him.
No turning back.
He thrust inside.
Aria was a virgin. As her hymen tore, the pain snapped her awake.
"It h-hurts...! Eh, Leon...? W-Why, ahh, nooooo!"
She screamed. But Leon kept pounding, raping her relentlessly.
"No! Stop... hyuu!"
He pinched her cherry nipples, and she arched back with a jolt.
"Sorry... Sis."
"No! We'll never be siblings again...! Stop... nnh!"
Leon sealed her anguished cries with a kiss.
It was too late. And deep down, he'd long seen her not as a sister, but a woman.
As their tongues entwined, she kissed back—making him delusionally think she accepted him amid the passionate exchange.
But when it broke, she fought desperately to shove him off.
"Sex with my brother? I hate it!"
She claimed to love him—did she have to resist so much? Leon thought selfishly.
Suddenly, the silver-haired woman appeared beside Aria, injecting something syringe-like.
Aria convulsed, her pale skin flushing red.
"W-What is this...!?"
"Aphrodisiac. Animal-grade—hundreds of times stronger than human stuff."
"No way... hyuu! Ahiii!"
Aria wailed in a mix of moan and scream.
Each thrust into her pussy sent waves of insane pleasure through her.
Leon's cock throbbed at its limit. To activate Absolute Command, he needed to inject semen.
In other words, creampie.
Aria realized it too.
"Not inside! I'll get pregnant with Leon's baby! My brother's child... nooo! Aahh, hii, hyau! Nooooo!"
His cock pulsed, flooding her womb with thick white semen.
"Aah..."
Aria slumped in despair.
A red, mysterious pattern appeared on her lower belly—a womb-shaped Inscription.
Thus, Aria became Leon's slave through his skill. He wept.
He'd defiled his ideal, his idol—his first love—with his own hands.
But their hell was only beginning.
Kidnapped and imprisoned separately, they were forced to mate morning and night like lab animals.
Aria resisted at first, but Absolute Command made defiance fuel her arousal. Daily aphrodisiacs and Leon's rapes gradually broke her into a literal sex slave, thinking of nothing else.
"I'm... just a lowly bitch slave who can only think of Master Leon's cock! Ahii, hyuu! Hyau, ahh, it feels so good...!"
Straddling him, she engulfed his cock and bucked her hips.
No trace remained of the proud Guardian or gentle sister.
She was now a female existing only to serve cock and chase pleasure.
Seeing her tragedy, Leon cried as he poured semen into her womb.
Such days lasted thirty.
At the final meeting, rationality flickered back in Aria's eyes.
She kissed him softly, like a lover, and smiled goofily.
"I'm not mad at what you did, Leon. You were threatened, right?"
"Sis... but..."
"I'll always wish for your happiness. Because I'm your big sister."
"Aria Sis..."
"So—ahh."
A guard injected her with aphrodisiac. Panting heavily, drool dripping, she began licking Leon's cock.
"Master Leon's hard, mighty cock... so yummy. Fill me with baby seed today too, okay?"
Once more, she devolved into a mere cock-servicing tool.
The next day, Aria's pregnancy was confirmed.
Of course, Leon's child.
Next time, we'll return to Estelle's arc!
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