How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 43

Chapter 43

After my meeting with Ayaka-san’s father, Kazuma, I stayed overnight at the Saionji estate, letting my guard down a bit.

“Aa… Master…♡”

“N… Nn…?”

“Haa…♡ Hot… Your seed’s coming out…♡”

“M-Momoka-san!?”

Waking in the estate’s bedroom, I found Momoka-san, one of the Saionji maids, beside me.

“Haa♡ Good morning, Master…♡”

“Kuu… Momoka-san, what’s going on?”

Bewildered, I was climaxing in her pussy first thing in the morning.

“It’s not fair that Akane gets all the attention…”

“Oh… That’s what this is about.”

Lately, Akane-san’s been my dedicated “caretaker.” Miyabi-san had warned me that others might see it as favoritism.

“We can take care of you too, right?♡”

“Uh, yeah… Sure.”

“Haha♪ From now on, love us all equally, Master!♡”

…

“So, that happened this morning,” I said.

“Kufufu, that’s on you,” Rosecia, the pregnant Waheide queen and my lover, chuckled.

I was confiding in her.

“Women are greedy creatures. They can’t stand their man favoring another,” she explained.

“Is that how it works…?”

“Indeed. So, husband—give me that cock already.”

“Alright…”

Rosecia yanked down my pants, eagerly taking my cock in her mouth.

“Gua… Feels good…”

“Nfo…♡ This beastly cock… Jururu♡ Irresistible…♡ Jujuzuzu…♡”

“Aa…! My hips are melting…”

“Nfufu…♡”

Her overwhelming oral skills and tongue work drove me to the edge, desperate to cum.

“Nn♡ Jubo… Jubo♡ Rero… Rerureru, nfo♡ — Jurururu~~~♡”

“Uoo…!?”

Her vacuum-like blowjob sucked my cock deep into her throat, a searing sensation ripping through me.

“Cumming…!!”

“Npu!? …♡ Nhaa…♡ Ngu, jururu♡”

She swallowed my semen greedily, her throat gokun gokun♡ as if savoring a sweet drink.

“Nn~~~♡ Chupa♡ Young, thick male seed is divine…♡”

Finished, she gazed fondly at my cock, grasping my balls and kneading them to check their contents.

“Ohh… Hot♡ Pulsing with life… Churning out seed inside…♡”

“Just came, so… During sex, they get even hotter.”

“Kufufu♡ What a lewd cock…♡ And such male pheromones…♡ No wonder young girls fall for you.”

“Not really.”

Not every woman’s as lustful as Rosecia. Some have strong desires, others barely any. I argued this, but—

“The better the woman, the stronger her lust. Every girl around you wants to fuck you.”

“No way…”

Too many “good women” to count, but I knew one with low desire.

“Like Miyabi-san.”

“Oh? Miyabi? Low libido?”

“Yup. We’ve had sex tons, but she’s always unfazed.”

It’s a bittersweet memory. Despite countless sessions, she never once said it felt good. Lately, with Ayaka-san’s final month keeping her busy, I haven’t had sex with Miyabi-san, and just seeing her makes me horny.

“Kuhaha! No way. She’s probably holding back desperately.”

“Really? We haven’t done it lately, but she’s her usual self, so maybe she just doesn’t have a libido.”

“Maybe she masturbates daily to cope? Kukuku…”

“No way.”

Miyabi-san, masturbating? Impossible. She’s calm, brilliant, perfect—a superhuman, my mentor, the woman I admire most.

“Who knows? I bet her desire’s immense.”

“Badmouthing Miyabi-san? Even I’ll get mad.”

“Ooh, scary♪ I’m not badmouthing her. But you don’t understand women, do you?”

Rosecia smirked, her confidence born of countless encounters, shaking me slightly.

(No, impossible. Miyabi-san would never masturbate.)

“Don’t underestimate a woman’s desires, husband♪”

“Uh, yeah…”

It’s not a problem, so I nodded. Still—

(I want to have sex with Miyabi-san…)

Recalling her gorgeous body, mounting her tight pussy, desire surged within me.

“Ohh…♡ Hard again♡”

“…Sorry.”

“No, no. A man should be like that.”

She licked her lips, and I was thoroughly drained soon after.

※

At school, I was active in the student council, handling club budget approvals and data entry.

“Drinks… Are these necessary expenses?”

Club budgets have guidelines, and non-essential items get rejected.

“For matches, yes. But this is excessive. Check the breakdown,” Maki Takagishi, the president, said.

“There’s protein powder.”

“Denied.”

Probably bought to use up surplus funds, but pricey items like that cause trouble as expenses.

(I get mine free, though…)

I drink custom Saionji protein shakes—pro-athlete-grade—after every meal.

(How much are they? Tens of thousands? Hundreds?)

Pondering, I entered the adjusted budget. Maki laughed.

“You’ve been a lifesaver. None of us can use computers.”

Lots of people struggle with them—similar to smartphones but trickier. I learned for gaming, so it’s nothing to brag about.

“Less paper helps,” Saito Misuzu, a second-year, added.

I thought she saw me as a rival, but she’s been teaching me enthusiastically, not competing.

“Impressive, Senpai…” Sumika Takagishi, Maki’s first-year sister, said.

“Haha, thanks, Sumika.”

Timid but close to me in many ways.

“I’ll copy it to the drive. No more hauling paper to the staff room.”

“Thanks♪”

Maki seemed intimidating at first but is actually a caring big sister. She’s nearsighted, wearing glasses during work.

(Like Sumika, she’s gorgeous…)

If she caught me messing with Sumika, though, I can imagine the fallout.

I adapted to the council quickly, treating it as a learning experience and committing to it.

“That’s it for today. Not much until the cultural festival, so learn at your pace,” Maki said.

“Got it. Thanks, President Takagishi.”

“Alright, dismissed!”

At her word, everyone packed up and left.

…

I lingered, then returned to the council room.

“Was waiting, Senpai…♡”

“Yup. Shall we, Sumika?”

Why were we back? For our other activity.

…

“A, nu♡ Senpai…♡”

“Your oppai are getting so sensitive, Sumika.”

Hugging her from behind, I whispered in her ear.

“T-There… No…♡”

“Nipples… Your weak spot?”

I teased her clothed nipple with my index finger, kurikuri♡.

“Yaan… Au… I’m going crazy…♡”

“Cute, Sumika… Chu.”

“Auu… N, nnn~~~♡ Chu, chu…♡”

Hugging her, I turned her face and kissed her.

“Sen… Pai…♡ N… Haa… Churu♡”

(Adorable… Definitely her first kiss.)

Her kiss was clumsy. Her timid nature made her hesitant with her tongue.

“Wanna try a naughtier kiss?”

“Awawa… I-I couldn’t…”

“Like this. Here.”

I pried open her soft lips, thrusting my tongue inside.

“Nn!? …Fuu… Na… Nju♡ Jururu…♡”

Her eyes melted, body relaxing as I ravished her mouth, savoring her sweet saliva while planning my next move.

“Senpai… I love you♡ Always have…♡”

“I’m a naughty guy who cheats a lot. That okay?”

“I fell for you anyway…”

Her face flushed red. Such a passionate confession, knowing my flaws—I couldn’t hold back.

“Sumika! I love you too. Let’s love each other tons…!”

“An♡ Hawawa…!”

I scooped up her light frame in a princess carry, setting her on the desk.

Clink clank, I unbuckled my belt, dropping my pants, revealing my rock-hard cock.

“Auu… That’s… Senpai’s…?”

“Yup, might be big for you, but it’ll be fine.”

My strange power helps. I’ve handled smaller girls, know how to take a virgin, and am experienced.

“I’ll loosen you with the tip.”

I pressed my cock to her pristine pink pussy, grinding guriguri.

“N!? Aa…♡ Your naughty thing…♡”

“Feels good, right…?”

Guriguriguri♡

“Aa♡ Aa…!”

Probing her hole with my glans, I unleashed my ability, relaxing her vagina.

(About time…!)

“Here I go, Sumika.”

“A, aa… Come, Senpai—!!”

Merimeri

My glans sank in, tearing her hymen puchipuchi as it delved deeper.

“Aa, aaa~~~♡♡♡ Feels good…♡”

“Came from your hymen breaking?”

“Big cock…♡ Coming inside…♡”

Thanks to turning pain into pleasure, she climaxed. Her trembling body clamped my cock kyunkyun♡.

“Aa… Tight, intense… Feels amazing, Sumika…!”

“Nnu…♡ Aa…♡”

Pushing deeper with my weight, I reached her depths just past halfway.

“Your cock…! So big…♡”

“This is your baby room, right?”

“Aan♡”

Tapping her cervix, she let out a cute moan, eyes half-open, gazing at me.

“Like a dream…♡”

“Sumika…”

“Sniff… Taken by my idol Senpai…”

She teared up again—not from sadness, but—

“We’ll do it tons. I already love you.”

“I love you too…♡”

A redo of her confession, her dreams fulfilled.

“Senpai♡ Senpai♡ Senpai~~~♡”

Paan! — Paan♡ Paan♡ Paan♡ Paan♡

“Aa♡ Aa♡ Aa♡ A~~~♡”

“Sumika! Sumika! Sumika! I love you~~~!!”

The desk rattled, nearly breaking, as I thrust downward with force.

“Aa…! Amazing… So intense, yet so good~~~♡”

Zuchu♡ Zuchu♡ Zuchu♡ Zuchu♡ — Zuchun!!

Unable to go all in, my hips moved frantically, pounding my hard rod into her soft flesh.

“Ahaa! T-That… No…♡ I’ll go crazy…♡”

“Cute, Sumika! Too cute!!”

My naughty cock relentlessly hit her deepest weak spot.

Dochu♡ Dochu♡ Dochu♡ Dochu♡ Dochu♡

“No…♡ My body’s flying…♡”

“Good…! Cum… Show me your cute face!”

“Aa… Aaaa~~~♡♡♡”

“Gu…!”

I plunged to her core, releasing a surge of love inside her.

“Aaaa~~~…♡ Coming…♡ Your naughty…♡”

“So cute, Sumika…”

My cock pumped semen like a broken machine, defiling the pure girl.

“I could die happy…♡ Haan…♡”

“Haha, no way. We’re doing this every day.”

“Haha, really… Like a dream…”

Closing her eyes, I kissed her softly, cleaning our soiled clothes and desk.

※

That night, a girl in her room indulged in lascivious memories, pleasuring herself.

“Nn♡ Haa… Haa… Haa… C-Cumming~~~♡”

Her mind replayed the depraved scene of her classmate and underclassman from hours ago.

Kuchu♡ Kuchukuchukuchukuchu♡

“Aaaa…♡ Can’t stop my fingers~~~♡”

Her white fingers stroked her sex, each motion amplifying pleasure.

(Why wasn’t it me…?)

She imagined herself in the girl’s place, embraced by those strong arms.

“Uaa…♡ Cumming~~~♡♡♡ Haa… Haa…”

Their meeting was poorly timed. Knowing her kouhai’s crush, she’d pushed him into the council, leaving them alone.

“But I didn’t know he was that hot…”

He’d become a hot topic in second year. After losing to him in midterms, she’d noticed him, but pride kept her from acting—a mistake.

“Smells so good… Tall… Sexy body…”

And, too embarrassing to admit, it was incredible.

“Haa♡ Haa♡ Haa♡ If that was his thing…”

Kuchu♡ Kuchukuchukuchukuchukuchu…♡

“Aao~~~♡”

Her body jolted like it was shocked.

(Sumika’s climax… So intense…)

Imagining her kouhai’s moans, pierced by that massive thing…

“Aa… My fingers again… Nnnu~~~♡”

She resumed tormenting her core.

“So jealous… So jealous…”

Filling her room with feminine musk, the girl burned through her youthful lust, consoling herself.