How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 47
Chapter 47
Eight days after Ayaka-san’s delivery, she was set to be discharged today. The extended hospital stay wasn’t due to health issues but the flood of visitors.
She and our child were about to return to the Saionji estate.
“Calm down, Master,” Akane urged.
“I’m plenty calm, Akane-san,” I replied, though I sat in a chair, arms crossed, too restless to do anything.
“Master, the mistress has returned!” a maid announced.
“!!”
The moment arrived. I shot up, nearly knocking the chair, and hurried to the entrance.
The estate’s grounds are vast, the drive from gate to entrance lengthy. My legs were faster, so I waited briefly.
A sleek black luxury car approached silently, stopping precisely before me. No doubt—Miyabi-san’s driving. Through the glass, Ayaka-san’s soft smile met my gaze, the face I’d longed for.
“I’ll open it now,” Akane said, stepping past me with a bow to open the rear door.
Her face, vivid now, bloomed into a radiant smile like a grand flower.
We locked eyes.
“Ayaka-san…”
“Darling…”
“Welcome back.”
“I’m home.”
Our words overlapped, and we embraced.
“I missed you so much, Ayaka-san…”
“Me too… I’m finally back with you…”
Kissing, stroking her hair, feeling her warmth—such simple acts brought overwhelming happiness.
“And… our baby…?”
“Hehe, right here. Look.”
“Oh…”
There, nestled in a car seat, was a tiny presence.
“Please wait a moment,” Miyabi-san said, opening the opposite door, deftly unbuckling the seat. She lifted the baby carefully and approached.
“Your son, Master Yuichiro,” she said.
“Wow… So small, so cute…”
“Would you like to hold him?”
“Can I?”
What a silly question—my own child. Yet his delicate, adorable form made me nervous.
“Like this… Here, darling♪” Ayaka guided.
“R-Right…”
Supporting his neck, I cradled him gently to avoid discomfort.
Heavy.
Small but brimming with life’s weight.
(Ayaka-san birthed this heavy life…)
I could only imagine her struggle. This life was priceless, sacred to me.
“Thank you… sniff. Ayaka-san…”
“Oh, why are you crying, darling?”
“I don’t know… Tears just come…”
“Hehe,” she giggled.
I tilted my head to keep tears from falling on Yuichiro. Above, a cloudless blue sky stretched endlessly, mirroring his boundless future, filling me with joy.
“Thank you for being born, Yuichiro.”
Thus, we three became a family.
※
“Congratulations on topping your grade,” Akane said, celebrating my final exam results as we headed to the estate.
“Haha, barely scraped it.”
Despite the chaos of Ayaka’s delivery, school life went on. Worrying about her, I didn’t neglect studies, securing first place.
(Summer break’s soon. I’ll see Ayaka-san and Yuichiro daily…)
Imagining our happy trio, I smiled. I thought my future was bright and joyful then.
※
<Yukino’s Perspective>
I was visiting Ayaka-oneechan’s house for the first time in ages. He went to the gym for training, so I was sipping tea in the living room, marveling at the grand estate. Then Ayaka-oneechan appeared, cradling a baby.
“Been a while, Yukino-chan.”
“Yeah, like six months?”
She’s as stunning as ever, brighter than during her illness, like when we used to play.
“That baby… Wow, so cute~”
“Hehe, this is Yuichiro. Say hi, Yuichiro, to Yukino-oneechan~”
“Ah~!”
“Oh, he smiled! Tiny hands…”
His small hand grasped my finger.
(Like him… Definitely his kid.)
Yuichiro, maybe a girl-lover, clung to my finger. Undoubtedly his child.
“Looks so happy, Ayaka-oneechan…”
“Yes. This is the happiest time of my life.”
“Wow…”
Having a child with your beloved, living peacefully—that’s a woman’s joy, she must feel.
(He’s gotten so cool, looks and heart… But I loved him first…)
“So, he cried—”
“Uh-huh.”
“Since then, he’s glued to me and Yuichiro♪”
Yuichiro rubbed my cheek as I endured Ayaka-oneechan’s lovey-dovey tales.
…
“Hey, Yukino,” he said, returning after about an hour.
“Training done?”
“Yup. Miyabi-san coached me, but I overdid it. Gonna shower.”
The estate’s cutting-edge gym gear optimizes training.
(His body’s so ripped…)
Post-workout, his upper body bulged, muscles taut. His sweat’s scent—sweet, tingling my core.
Jun♡
(Oh no… Here, with a baby…)
My body ignored decorum, secreting naughty juices.
“Yukino-chan? Your face is red…” Ayaka noticed.
“Awawa, I’m fine… Just hot lately, maybe?”
Mid-July heat was normal. She bought my flimsy excuse.
“Then why not swim in the pool?”
“Nice. I’m sweaty—wanna join, Yukino?”
“Hehe, have fun together.”
Postpartum, Ayaka-oneechan couldn’t swim, so he and I headed to the pool.
※
I rinsed off and went to the Saionji indoor pool.
(Still too small…)
The provided swimsuit barely contained my growing groin, outlining my penis.
(Yukino’s used to it, though.)
Unbothered, I reached the poolside.
“Oh…”
“Yukino—”
My groin twitched unwittingly.
Yukino, hair up, exuded maturity. Her undersized school swimsuit accentuated her curvaceous, lewd body.
“Weird…?”
“N-No… Super cute. Why a school swimsuit?”
“Never worn others…”
“Makes sense. You’re so proper.”
Addicted to our sex, she’s naughty now, but she was once a strict class rep.
“Geez… You too…”
“Yeah, wrong size.”
“Hm…”
Her gaze fixed on my bulge.
(Why’re we more excited than at school…?)
Her cuteness naturally thrilled me—hair tied for swimming, a swimsuit failing to hide her erotic figure. But why was she, seeing my usual self, so aroused?
“Hey… Hup!”
“Whoa…”
She hugged me suddenly, her soft oppai pressing munyuri♡ against my abs.
“What’s up?”
“Just… Felt like it.”
Her body burned, clearly craving me.
“Yukino…!”
“An♡”
No way I’d ignore this beauty. I embraced her, savoring her soft flesh.
“Aa♡ Amazing… A guy’s body…♡”
“Your body’s so sexy, Yukino…”
“Haan…♡ Press harder♡”
My cock, too big for the swimsuit, poked out, grinding against her belly, feeling her flesh through the fabric.
Zunyu♡ Zunyu♡
“Nn♡ Incredible…♡”
“Yukino… So cute…”
“Nnnn~~~♡”
Stimulated by my cock, her knees buckled, nearly collapsing backward.
“Dangerous!!”
“Ah… Thanks…”
“You okay?”
Holding her, I kept her from falling, her butt hitting the floor.
“Yup, fine—An♡”
“Oh… Soft…”
By chance, my hands were kneading her oppai as she lay sideways.
Munyun♡ Gunin♡ Mugyuu♡
“Aaa…♡ Yaa… Nn♡”
“Amazing oppai, Yukino…”
“Geez…♡ Haan♡”
My fingers instinctively moved, delivering overwhelming pleasure.
“Aa… Aaau♡ No… I’ll go crazy…♡”
Gunyungunyun♡ Gui—— Gyuuuu♡
“Auuu~~~♡”
Slipping under her swimsuit, my fingers sank into her soft oppai, and she came, eyes rolling back.
“Aoo…♡ Came… Just from my oppai…♡”
“Show me more cute climax faces… Here.”
Lifting her from the hard floor to a mat, I kneaded her oppai more.
“Let’s free these pretty nipples…”
“Yaa…♡”
Tugging her swimsuit, I exposed her breasts, flicking her pink peaks pin.
“Hiu!? Why’s it so good…♡”
“Amazing, Yukino. Feel even better…”
Gunyu♡ Gunyu♡ Gunyu♡ Muniii~~~♡
“Aa♡ Aa♡ Aaaa~~~♡”
She climaxed again. I love girls’ climax faces—seeing them is as thrilling as my own pleasure.
“Yukino, too cute… Chu, jururyu…”
“Haooo… Nn, jyu… jyuzuzuzu♡”
“Jyupa… Yukino, juzurororo…”
I devoured her flowing saliva, our fierce kisses echoing in the empty pool.
(Yukino’s changed so much in a year…)
The only girl I talked to when I had no friends. I never imagined this relationship back then.
“Haa♡ Haa♡ Haa♡”
Over-climaxed, her face flushed, breathing ragged, body feverish.
“Wanna hit the pool?”
“Y-Yeah…”
Cooling off in water was best. Supporting her wobbly frame, I entered the pleasantly cold pool.
“Feels nice…”
“Yup… So good♡”
Clinging to me, she enjoyed the pool. We soaked in the cool comfort, embracing. Then she asked,
“You made a baby with Ayaka-oneechan, right…?”
“Uh, yeah…”
I hadn’t directly told her.
“Why?”
“Why…?”
Honestly, I didn’t plan it. She’s married—having a child was risky. Logically, we could’ve terminated it.
But seeing our growing child and Ayaka-san’s joy, I found life’s purpose.
“Because we love each other, I guess.”
“…Why—”
“Yukino?”
“—Why not me? I loved you first…!”
Burying her face in my chest, she sobbed.
(She wanted a baby too…)
“Sniff… I’m fine being second, third…”
“Yukino…”
“Just love me as much as the others…”
“Yeah… My resolve was lacking.”
Ayaka-san, Satsuki-chan, Maya, Rosecia—I’ve fathered many children. Yukino, feeling left behind, exploded with insecurity.
“We’re still high schoolers.”
“Yup. But we can study with a baby, right?”
“True…”
She’s right. Adults say students shouldn’t have kids to shirk responsibility, ignoring our happiness.
“Yukino… Let’s make our baby.”
“Really?”
“Yup. I’m resolved. No matter what anyone says, our love won’t change.”
“—♡ Yup… Yup…♡”
Thus began our baby-making sex.
…
I had Yukino grip the poolside rail for stability, entering her from behind.
Paan♡ Paan♡ Paan♡ Paan♡
Obscene flesh-slapping sounds echoed in the quiet indoor pool.
“Haa♡ Your cock’s so excited…♡”
“You’re gripping me tighter than usual…!”
Deciding to make a baby, our young bodies surged with heightened arousal, delivering intense pleasure.
“Nn! Nn! Nu! So good…♡”
“Yukino, uaa…!”
Pachun♡ Pachun♡ Pachun♡ Pachun♡ — Bachun!!
“Ooo♡ Intense…♡ Aa, cumming… Cumming!!”
I relentlessly targeted her cervix, accelerating for insemination.
(I’m gonna impregnate Yukino!!)
The thought sent a hot surge from my balls.
“Ugh!! Cumming!!”
“Oh♡ Hoo…♡ ~~~♡”
To impregnate her, I thrust deep, unleashing thick semen into her womb. Unbelievably dense, it filled her instantly.
“Get pregnant, Yukino… With my seed… Pregnant!!”
“Aaa~~~♡♡♡”
Byuku♡ Byuku♡, each spurt sent fresh semen to her womb, swarming her eggs.
“Haa…♡ Definitely… Conceived…♡”
“Yukino…! More to come!!”
Pachun!! Pachun!! Pachun!! Pachun!!
“Nhoo♡ Already pregnant…♡ Nn♡ Nn♡ Nn♡”
“Here! Here! Making sure you’re pregnant!!”
I’d never let her go. I’d mark her body as mine forever, pounding her depths repeatedly.
“Ihii♡ No more…♡”
“Yukino… I love you!!”
“Aaa… Me too… I love you♡”
“Uoo!! Cumming!!”
Another ejaculation, as voluminous as the first, flooded her womb.
“Aaa…♡ Too much…♡”
“Yukino… I’ll love you more!!”
I kept loving the exhausted Yukino, my stamina endless, until a maid called for dinner.
…
“Phew… Thanks for the meal.”
“Thanks…”
“Hehe, you two ate a lot,” Ayaka said, laughing joyfully at our shared dinner table.
(Worked up an appetite…)
“Looks like a healthy baby’s coming, Yukino-chan♪”
“Eh!?”
“Ayaka-oneechan…?”
She knew we were trying for a baby.
(That swimsuit was planned…)
Like Miyabi-san’s setup before, Ayaka orchestrated this.
“Is it okay, Ayaka-oneechan…?”
“Of course. I’m here because of you, Yukino-chan.”
“Oneechan…”
“I met my beloved because of you. I want you to be happy too.”
“…Thank you. I’ll have a healthy baby like Yuichiro-kun.”
“Hehe, let’s do our best. I’m rooting for you.”
They’re so close. Yukino once asked me to heal Ayaka-san’s illness—an absurd request, but her genuine wish to save her.
“Thanks from me too, Ayaka-san.”
“Make Yukino-chan happy, okay?”
“Absolutely.”
Thus, another person became dearer than a lover. No matter what society says, I’ll love them all, renewing my resolve as we enjoyed lively table talk.
※
“Hey, old man. Is it true that sow birthed a child?”
“Y-Yes… Mistress Ayaka delivered recently and returned to the estate with the child.”
“Got it. I’m heading to the Saionji estate now.”
The man grinned, eyeing the girl he’d repeatedly violated.
“Take her to the basement. I like this one—I’ll keep her as a pet.”
“Yes, young master.”
Wiping his manhood’s residue with a silk handkerchief, he tossed it at her, issuing orders.
He grinned, envisioning himself ruling the nation.
His next move was crucial—stealing the child from the sow he despised, his legal wife.
※
“What’s this about, Miyabi?”
“If it’s Your Majesty, you likely already know.”
“Hm? What could you mean…?”
Rosecia chuckled, kukku. Miyabi remained expressionless.
“Don’t misunderstand—I act only for my and my nation’s benefit.”
“Understood.”
“Crafty vixen. Kukuku…”
Alone, the two held a secretive talk, known only to them.
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