How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 49
Chapter 49
“Miyabi-san…”
She meant me, didn’t she? By signing the Amakawa adoption papers, once they take effect, we’d be step-siblings.
“What’s the matter?” she asked, her voice smooth.
“N-Nothing… Did I do something to upset you?”
A dumb question, I know. But the aura radiating from Miyabi-san felt so alien, it threw me off completely.
“I’m not offended in the slightest,” she replied, her tone calm.
“Really…? It’s just, you seem… different somehow.”
When I pressed, her face lit up with a mischievous grin I’d never seen before, and her answer came with a playful lilt.
“Perhaps. But it’s not my demeanor that’s changed, is it? It’s our positions.”
“Positions…?”
“Exactly. You’re my step-brother now. And you’re not yet a Saionji. Which means—”
Her lips curled into a sly smirk.
“—you can’t defy your big sister, can you?”
“…Oh.”
It hit me. I’m already being treated as an Amakawa. Until I marry into the Saionji at 18, I’m under my “big sister” Miyabi’s authority.
“So, you’re not my master anymore…♪”
“Ah… Ahh…”
Her piercing gaze pinned me. That alone sent me crashing to the floor, my legs giving out like jelly.
(What’s going on…? Why is Miyabi-san acting like this?)
The perfect woman I’ve always revered, my mentor—Miyabi-san’s transformation shocked me to my core. But she didn’t seem to care about my turmoil.
“This isn’t guidance anymore. It’s discipline.”
“Wha…!?”
Frozen as if injected with venom, I couldn’t move. In a flash, she rolled me onto the bed, stripping my clothes away.
“Nfufu, you’ve grown up nicely, haven’t you?”
“Uah…!?”
Her slender fingers wrapped around my manhood, inspecting it with a clinical touch.
“You’ve become magnificent♪ Just as I planned.”
Gyuuu♡
“Guh!?”
She gripped my balls—my most vulnerable spot. Yet I couldn’t resist her.
“What… are you saying, Miyabi-san…?”
“Don’t you get it? This penis, these balls… your splendid body—I cultivated them.”
“Agh…! I don’t understand!”
Her precise touch teased my groin, blurring the line between pain and pleasure. I was lost, unsure how to react.
“That ‘medicine’ I had you take after every meal? It was to amplify your virility.”
“The protein shakes…? Oh…”
I’d suspected as much. That sweet, distinctive scent, the surge of energy after drinking—they came from pao fruit.
“Pao fruit, right?”
“Hehe, yes. It has potent tonic effects, especially for boosting sexual stamina.”
I’d experienced that firsthand in Waheide’s palace. Constant doses explained my escalating libido.
“And—jyu~~~♡ I let this penis taste countless women…♡”
“Auu~~~!”
Her beautiful lips engulfed my cock, sucking hard. The sensation alone plunged me into a climax-like ecstasy.
(I can’t resist… It’s like my body refuses to defy her.)
“You understand, don’t you? You can’t move.”
“Why…?”
“Hehe… I trained you that way. Your mind, that is.”
She was right. Somewhere along the line, I’d internalized that defying Miyabi-san was wrong. I’d deified her—a flawless, infallible superhuman.
“Your mind already belongs to me.”
I couldn’t even think otherwise. Was this what it meant to have my spirit dominated…?
“My words or your thoughts—which are correct?”
“Yours, Miyabi-san.”
“Good.”
Oh no… I’m accepting her words unconditionally. But I can’t stop it—my heart screams that she’s right.
“Then—shall I claim your body too?”
With that, she exposed her secret place and straddled my cock.
…
<Miyabi’s Perspective>
My plan was flawless. Over a year, I completely mastered this man’s mind.
It began the moment I heard Ayaka-sama’s illness was cured. From that instant, I resolved to bind him to the Saionji forever.
A man wielding a mysterious power surpassing modern medicine—the God Hand. I saw unparalleled value in it. Unlike my reproducible talents, his was a true gift from the heavens.
What is the God Hand? My best hypothesis: a form of fangzhongshu—ancient Chinese medicinal or mystical arts tied to sexual techniques.
By channeling his vital energy through his hands, he bestows various benefits on the opposite sex. That’s the essence of his power, I believe. And the stronger his vital energy, the greater the effect.
With that in mind, I amplified his energy through Saionji training and pharmacology. Using his enhanced ability, he devoured women, growing stronger still, evolving into a superior male.
To forge mental resilience, I orchestrated his study abroad in Waheide. As predicted, it skyrocketed his abilities, his overflowing vigor transforming into a magnetic charm that captivated women.
Finally, disposing of that overambitious fool, Hojo-in, completed my plan.
(He played the perfect villain, deepening their bond.)
Love burns brighter with obstacles. In a way, he was a convenient pawn.
…
“Look, your favorite—my pussy♡”
“Gu… Haa, feels good…!”
“Hehe, of course. You love a woman’s body, don’t you?”
I took his swollen, massive cock into my depths.
(This freakishly developed penis has ravaged countless women…)
Its engorged head, rock-hard shaft veined like rugged stone, and balls endlessly producing sperm—a lance that pierces women, igniting their instincts, enslaving them. A deadly weapon to females.
But not to me, with his mind under my control.
“This penis is mine too.”
“Aaa…!!”
A single squeeze of my vagina made his cock leak precum from sheer pleasure.
(You can’t escape.)
I have no intention of letting him go. I painstakingly molded him, sculpting his looks and physique into perfection—all for…
Ayaka-sama.
My revered master, dearer than life itself. For her, I’d spare no effort. This man is my offering to her.
“Listen, little brother. You obey your big sister.”
“Aa…! Miyabi-san…!”
“Answer properly!”
“! Y-Yes…”
I pinched his nipple. Regaining clarity, he responded obediently. Painful, but necessary—to present him as the perfect man, utterly submissive to Ayaka-sama.
“That’s right. Follow me, and you’ll love Ayaka-sama forever, free to play with lovers I approve.”
“Yes…”
“You’re an Amakawa now, soon a Saionji.”
“Yes.”
“No need to worry. I’ll guide you.”
“Thank you…”
It worked. I’ve tamed his mind and claimed his body.
He’s entirely mine to command.
“Now, your reward. Nn♡ Ha♡ …Nnn♡”
Nuchanucha♡, my vagina’s lewd sounds echoed.
“M-Miyabi-san…! I-I…”
“What’s wrong? Here, here!”
Squatting, I rode him, pachun♡ pachun♡, our flesh striking a rhythmic melody.
“Aaa!! Miyabi-san, wait—”
“Here, here, here! Nfu♡ You’ve become a splendid man♡”
My body heated, pent-up lust flooding from my womb. Driven by desire, I used the bed’s rebound to slam his cock deep inside.
(Ohh♡ This… This! Thick, hard… No dildo compares♡)
Dochu♡ Dochu♡ Dochu♡ Dochu♡ Dochu♡
“Nn♡ Good…♡ —Nn♡ Nn♡ Nnn♡”
Adding twists and grinds to my thrusts, I heightened the pleasure.
(His cock and balls are swelling♡ He’s falling…)
“Gu, ooo~~~!! Miyabi-san…! I’m… cumming!!”
“Fall♡ Fall♡ Fall♡ Hehe… Come to my paradise♡”
Paradise—our new world, built by the three of us and our descendants. Ayaka-sama and him, loving each other, with me serving them, our happiness eternal, untouched by age.
“Impregnate me!!”
My children, born to support Yuichiro-sama, will secure our reign, eliminating all threats.
With a final thrust, I slammed my full weight onto his cock, contracting my vagina to milk his seed.
“Ugo…~~~!!!”
“Ohn♡ It’s out…♡ Hehe… Hahahaha♡”
“Aga…! My cock’s breaking…!! Aaa~~~…”
Dokun dokun, an impossible volume of semen flooded my womb, thick and sticky, clinging to my reproductive organs.
(Ah… I’m definitely pregnant…♡ With the same seed as Ayaka-sama, my lineage…!)
“Ufu… Hahaha, more! Give me more, my cute little brother♡”
“Aooo!! Aa!! Aaaa…!! My cock’s ruined!!”
“Haha, more, more…♡”
Glorious. My body trembled with triumph, brimming with unparalleled joy. The thrill of conquering a man, becoming a mother with the same seed as my beloved master.
I’ve seized everything I desired.
“So? How’s it feel to impregnate me…♡”
Whispering into his ear as he still ejaculated.
“Miyabi-san… Miyabi-san… I love you…”
“Nfu♡ I love you too, little brother♡”
“Aa… The best…”
Final confirmation.
“Who do you belong to?”
“…Miyabi-san.”
“You’ll obey me in everything.”
“Yes… I’ll follow you…”
“Good.”
(He’s fallen♡)
My plan is complete. Not flawless from start to finish, but the result is impeccable.
I felt profound satisfaction, happiness welling from my core.
※
I impregnated Miyabi-san. The moment I came, my mind nearly shattered. A colossal flood of semen surged into her womb, overwhelming her ovaries, assaulting her eggs. The sensation of absolute impregnation was undeniable.
The joy of impregnating my idol in one shot sent shivers through me. Nothing else mattered.
(She’s beautiful… I’ve always loved her. Any form, I don’t care.)
Miyabi-san’s ideal world—her, Ayaka-san, and me, with our children—a paradise. I’d love Ayaka-san most, cherish Miyabi-san, and indulge in my concubines. What a beautiful, sweet temptation.
No reason to refuse. I didn’t need to think anymore.
In that moment—
My consciousness plunged into darkness.
…
(I’ve been here before.)
When Rosecia drugged me, right? I thought of Ayaka-san then…
Ayaka-san. My future wife—graceful, beautiful, kind, warming my heart.
Living with her and Miyabi-san, two stunning women, thrilled me. But something nagged.
Was Ayaka-san my only true love?
No, there’s another. A girl I swore eternal love to, my number one.
The first girl I noticed, always near.
Cute, beloved, secretly ogled daily. Her tanned skin dazzled me, making my flawed self feel inferior.
But I’m set for paradise. She’s unnecessary.
Yet this girl, threatening our paradise—who is she?
“Onii!”
Oh.
What am I doing? I swore, didn’t I?
No matter what, forever—I’d love Ai. I promised to be with my sister, Ai.
Then paradise is the unnecessary one.
I’ll smash it to pieces.
…
“What…!?”
“Miyabi-san… I…”
She loomed over me, her face alight with pleasure. Using my abs, I flipped her, launching my counterattack.
“H-How… Suddenly…”
“I…”
Her shocked expression—unprepared, her usual composure gone.
(This is my only chance…)
I pushed my ability beyond its limits.
(My body’s burning!!)
If she regains control, I’m done. I have to strike this fleeting gap.
“Guuu…! Aaaa!!”
My vital energy converged on one point.
“Your… penis… inside… Naa♡”
(Hot… My groin’s scorching…)
“I don’t want paradise.”
“What…?”
I channeled all my energy into my balls.
“Darling… W-What are you…”
My ultimate technique, the culmination of my developed ability—
“I don’t want a paradise—I want a harem utopia!!”
Zudon♡
“Nghiii~~~♡♡♡”
Boosted by my ability, ultra-concentrated semen erupted in a mating press, slamming into her womb.
Zudon♡ Zudon♡ Zudon♡ Zudon♡
“Ogo♡ Agu♡ Oo♡ Hoo~~~♡”
Driven by desire, I devoured her.
This past year, I’ve learned my essence. I love girls, love sex, and can’t be satisfied without claiming those I desire with my cock.
I understand now.
And you gave me that trigger, didn’t you, Miyabi-san?
Dogo♡
“A… Oooo~~~♡♡♡”
“Miyabi-san! Miyabi-san! Miyabi-san!”
“No…♡ Stop~~~♡”
“Fall! Fall! Fall! Grr…! Come to my harem utopia!”
I pistoned with fiery intensity. To claim my beloved, I’d burn out without regret.
Dojun♡ Dojun♡ Dojun♡ Dojun♡
“My body… Burning…♡”
“Haha…! Feels amazing! Hn! Hn! Hn!!”
“Ooooo~~~♡”
My momentum didn’t stop—it accelerated.
(What’s this… From her body… Something’s flowing in.)
Vital energy? I might not just send it—I can absorb it too.
(I get it. My ability’s true nature… Vital energy circulation…!)
I gathered energy in my cock—and thrust.
Zudon♡
“Ohiii~~~♡”
I absorbed the energy back through my cock.
Zunyu…♡
Zudon♡ — Zunyu♡
Zudon♡ — Zunyu♡
Zudon♡ — Zunyu♡
“Aa♡ Cock♡ Cock♡ Cooock~~~♡♡♡”
Miyabi-san—that Miyabi-san—making a foolish face, lost in ecstasy.
Incredible.
This.
I can’t stop.
“Aaaa~~~♡ More cock♡ Cock cock cock♡”
Ravishing her all night, dawn broke. But I wasn’t satisfied.
Zudon♡ Zudon♡ Zudon♡ Zudon♡
“Not done yet, Miyabi!!!”
“Ooo~~~♡ Cock~~~♡”
Endless desire. Infinite energy cycles.
“Oh♡ Ohoo♡ Cock-sama~~~♡”
“Miyabi!! Feeling it!?”
Words I’d longed to hear. I pounded her pussy, nearly breaking the bed.
“Nhoo♡ Feeling it♡ My pussy, my oppai… Feeling it all~~~♡”
Is this joy? Every pore opened, my blood boiling.
Unleashing a year’s pent-up emotions, I kept thrusting. Dawn rose to noon, then dusk, and through the night—I never stopped.
A full day, never pulling out, ravishing Miyabi.
Gobogobo♡, thick semen spilled as I withdrew.
(Beautiful… Her pathetic, semen-drenched form is her most stunning.)
“Miyabi, who do you belong to?”
“Ahee…♡”
“Come on, answer properly.”
Gyuu♡
I pinched her nipple.
“Aon♡ I… Belong to Master~~~♡”
Screaming, spilling milky fluid from her semen-packed womb, her eyes unfocused, fixed on my groin.
“Look at my eyes. Again.”
“I belong to Master…♡”
“Good.”
I’d never treat her as a thing. She’s my precious woman. Satisfied, I studied her, still sunk in pleasure.
So beautiful. Among Japan’s beauties, Ayaka-san and Miyabi-san are unmatched.
(She’s… 27, right?)
A stunning older sister is my type, no complaints. But…
(What if I rejuvenated her?)
Curiosity stirred. Mastering my ability, I could extend cellular lifespan easily.
(Let’s try.)
“An♡ Oppai… Feels good~~~♡”
Munyu♡ Gunyun♡ Munyuu♡
(About 20 years old…)
I sent energy through her oppai, cycled it, and returned it. That’s all it took.
Now instinctive, I wielded my power like breathing.
“A… This… Haan♡”
“Set you to about 20.”
“A… Haa… Haa… Ahaa…♡”
Her eyes gleamed with lust, and—
Buwa♡
A flood of lewd pheromones burst from her body.
“Aa…♡ More cock…♡ Cock sex… Please♡”
(What have I done…?)
The Perfect Maid revealed her true self—a lascivious woman.
“You lewd vixen…”
“Yes♡ Miyabi’s lewd pussy♡ Ravish it, Master~~~♡”
My sacred image of her shattered. Before me, a depraved woman, spreading her pussy, hips twitching.
That woman—
“The best. I love you, Miyabi!!!”
I’d love her forever.
※
<Rosecia’s Perspective>
“Kukuku… Still at it, eh?”
“Yes, Your Majesty. For over a day, lewd sounds have echoed from that room…”
“Let them be. Their stamina’s inhuman. They won’t emerge soon.”
That Miyabi. Probably tried to ensnare my husband, but…
“So naive…♪”
Taming that beast? Impossible. His desires are on another level. One or two women could never satisfy him.
He’ll devour beauties worldwide before stopping.
“Truly entertaining♡”
“What, Your Majesty?”
The thought alone makes my womb ache. What if I nurture him further, forging the ultimate male?
“Kuku… How far can your father go?”
Muttering, I stroked my growing belly.
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