How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 41

Chapter 41

Mid-June, Maya’s pregnancy came to light. With Ayaka-san’s due date just two weeks away, Miyabi-san dropped another bombshell.

“Master, the Grand Master—Ayaka-sama’s father—will arrive the day after tomorrow.”

“You mean Ayaka-san’s dad…”

It makes sense; his daughter’s about to give birth. But I felt oddly detached.

“Should I stay away that day?”

“No, it seems the Grand Master knows everything.”

“What!?”

Everything—including that the child in Ayaka-san’s womb is mine.

(This is bad… To the Saionji family, I’m just a nobody with no value.)

A commoner impregnating their daughter could spark a catastrophe.

“What do we do…?”

“Running won’t help. The Grand Master is gentle. Approach him with sincerity, and it should be fine.”

“Got it.”

Trusting Miyabi-san, I resolved to stand by Ayaka-san’s side when her father arrived, steeling myself for the encounter.

(I can’t mess this up…)

One misstep could shatter our relationship. I’d be condemned as an interloper, and Ayaka-san might face accusations of infidelity, with who-knows-what consequences. Plus… if things go well, this man could become my father-in-law.

I decided to memorize every detail about the Grand Master by the day after tomorrow.

※

Meanwhile, school brought new developments. I’d been told to visit the student council, so I stopped by after classes.

Knock knock.

“C-Come in…”

The faint voice answering my knock belonged to a timid female student.

“Excuse me.”

Click.

Inside was a cozy room with work desks and stacks of papers.

“Hey, I’m here because President Takagishi asked me to—oh? You’re…”

“A-Ah… Senpai…?”

The girl I met first was, surprisingly, someone I knew.

(I think she’s the first-year I rejected… Made her cry when I turned her down.)

She was especially cute, so she stuck in my memory. Sitting in the offered chair, I recalled her details. Her name was—

“Sumika Takagishi, right?”

“Y-You remembered my name…”

“Yeah. Sorry about last time.”

“N-No, no, no… I was presumptuous, thinking I could be your girlfriend…”

“That’s not true. I think you’re really cute, Sumika.”

Sitting across from her now, she looked like a flawless beauty.

“N-N-N-No way… Being praised by you, Senpai… It’s too much, ehehe!”

Maybe her timid nature is her defining trait. But something else caught my attention—her last name. Likely…

“Are you related to President Takagishi?”

“Y-Yes, she’s my sister. She hasn’t arrived yet… Sorry.”

“No worries. I’m happy talking with you.”

“Hauu…”

Sumika fidgeted, clearly shy.

(She’s so cute… Why did I reject her back then?)

Sure, I can’t date everyone, and I thought it was the right call at the time.

“Are you in the student council too?”

“Um, yes… Only for about half a month, though…”

“So you must be pretty smart.”

“W-Well… It was a fluke, but I got the top score in the last test…”

“You’re the first-year top scorer? That’s amazing.”

Back then, I was just average.

“Y-You’re the top scorer too, Senpai! And cool, athletic… I’m nothing compared to you…”

Her voice trailed off, mumbling. I watched her fondly until another council member burst in.

Slide.

“All done~! Sumika-chan and… you…”

“Done for the day, Misuzu-senpai.”

“Come on, just Misuzu, Sumika-chaaan!”

“S-Sorry, Misuzu… chan.”

“Yup! Approved!”

A lively girl appeared—Misuzu, apparently. I didn’t recognize her.

“You don’t know me?” she asked.

“Second-year, right?”

“Yup~ But you really don’t know me?”

“Sorry, no recollection.”

The girl, her sleek hair in a ponytail, was another striking beauty.

(I’d remember talking to someone this gorgeous…)

Her provocative gaze met mine, but something else stole my focus—

(Her oppai are huge!!)

The twin peaks resting on her crossed arms were extraordinary, far beyond typical students.

Unaware of my lewd thoughts, she continued.

“Haha, we’ve never met directly, so it figures. Still, it’s kinda humiliating.”

“Really sorry, I’m drawing a blank.”

“Guess it’s fine… It’s over now. I’ll fill you in.”

Misuzu’s mood shifted, her pout fading as she explained.

“I was the top scorer all last year.”

“Oh, that’s it.”

“And then you beat me in the second-year’s first exam…”

Apparently, the council picks the next president from the new term’s top scorer—a role I inadvertently stole.

“I didn’t need to be president, but after a year of groundwork, losing like this stings, you know?”

“I get that.”

Like Sumika now, she joined the council early last year, working hard. Having that effort nullified feels unfair.

“Alright, I’ll stay out of the council.”

“No way.”

Why not?

“That’d make it look like I pushed you out.”

“I wouldn’t see it that way. I might’ve just gotten lucky this time.”

“That’s fine for you, but not me. Objectively, I’d look like the bad guy, right?”

“…Some jerks might say that.”

People love gossip, twisting truth for a juicy story.

“Plus, I want to beat you fair and square.”

“…”

So, a rivalry. A beautiful girl as a rival doesn’t quite click for me, but…

“Join the council, okay?”

“I get it, but I’m not sure about time. Can I be provisional for now?”

“That works. I’ll tell the president.”

“Thanks, uh…”

Didn’t catch her last name. Calling her Misuzu outright feels bold.

“Saito Misuzu. Misuzu’s fine.”

“Misuzu… chan?”

“…Just Misuzu!”

“Got it, Misuzu.”

With that, the talk ended. With nothing else to discuss, I wondered what to do when—

“No tasks today, so chat with Sumika-chan.”

“What about you, Misuzu?”

“Helping the president. See ya~♪”

She left, leaving me and Sumika alone.

“A-A-Ah… Um, um, um…”

“Sumika, relax.”

She sputtered like a glitching machine, repeating “um.”

“I-If it’s okay… I can show you where files are… or, uh…”

“You’ll teach me?”

“Hya!? Teach!? I-I couldn’t…”

“You’re the senpai here, right? Sumika-senpai?”

Too cute—I couldn’t resist teasing. But that backfired—

“H-Hyauu…! Awawawa…”

She knocked papers off the desk, scattering them.

“S-S-Sorry!!”

Panicked, Sumika crouched to gather them, her skirt flipping up, revealing her cute panties and perfect rear.

“I-I’ll pick them up quick…”

“I’ll help, Sumika.”

I placed a hand on her shoulder to calm her, swiftly collecting the papers.

“T-Thank you, Senpai…”

“No big deal. I won’t get mad over mistakes, so take it easy.”

“H-Hawaa… Senpai…♡”

Her face flushed, eyes spinning like she was overheated.

“You okay?”

“Y-Yes…♡”

Too adorable. She stirred a protective urge, like a lovable small animal.

“I-I’ll pick up too…”

Still dizzy, she knelt to grab papers.

(Hmm… That’s a plump, juicy peach of a rear…)

Slim yet with a rear begging to be squeezed. Sneaking a peek—

(Uh-oh… Getting hard…)

School sex has been tough lately, and I only relieved myself at lunch. Once I noticed, I saw Sumika as a sexual object.

“F-Finished picking up… Senpai?”

“Yup, me too. Wanna talk over here?”

“Y-Yes…♡”

Hiding my erection, I guided her to a chair, whispering from behind.

“Think I’d fit in the student council, Sumika?”

“O-O-Of course! If you joined… I-I’d… I’d be so happy…”

“Really? I might not be the cool senpai you think.”

“No way! I’ve always… Uuu…”

She confessed to me—that took guts. She deserves to know the real me.

“Even if I did something like this… would it be okay?”

“Huh? Hyan…♡”

I hugged her from behind, chair and all. She jolted, freezing with tension.

“Okay?”

“A-Ah… Your strong arms… Haa…♡”

“You’re cute, Sumika… And you smell amazing.”

“E-Eh… D-Don’t sniff so much…”

“Suu… Smells good. Perfume?”

“N-No… I-I don’t wear any… Auu…”

A sweet, citrusy scent—her natural body odor.

“Suu… Haa… Not bad, right?”

“Y-Your body… Taking in my scent… Aaa…♡”

“Your voice is cute too… I wanna hear more.”

I couldn’t stop pampering her. Before I knew it, I’d unbuttoned her shirt, slipped off her bra, and—

Kuni♡ Kuni♡ Munyu~~~♡

“A… Yaa…♡”

“Bad?”

“A… Haa…♡ N-No… It’s not…♡”

My hands, at full power, electrified her erogenous zones.

(I’m done hesitating…)

I vowed to love fully when I fall for someone.

“Then I’ll go harder… Here!”

Gunyun♡ Kunyukyu♡ Muniii~~~♡

My hands traced circles, stretching her oppai forward, fingers pressing pleasure meridians to flood her body with ecstasy.

“A, u♡ T-That… N-No…♡”

“You’re so cute, Sumika.”

“N-No… Your hands, your voice… Auu~~~♡”

Bikun♡ Her body twitched. She was feeling it. Barely a minute of fondling, and she’d lightly climaxed.

“I’m this naughty of a senpai, Sumika.”

“Haa…♡ Haa…♡ Auu…”

“If I join the council, I might do naughty things every day…”

“E-Every day…♡”

Her pussy started soaking through her panties, the thought alone drenching her.

“Could you handle daily naughty stuff?”

“Every day… With you… Aa♡ Aaa~~~♡♡♡”

Bikun bikun♡

Imagining it, she came, drooling cutely.

“If you’re okay with it… I can make you feel even better.”

“Aa…♡ Aaaa…♡”

Gunyun♡ Gyugyu~~~♡

“Nhi…♡ No… Again… Aaaa…♡”

“Suu… Haa… Your sweat smells so good, Sumika.”

Biku biku biku♡

“Aa…♡ U~~~♡♡♡”

Her biggest climax yet. The feedback to my hands was intense.

(Her mind’s drowning in pleasure…)

“Haa…♡ A… ——”

“Sumika? Hey, Sumika!?”

Her state…

“Haa…♡”

I’d overdone it—Sumika passed out, her face a disheveled mess.

…

“S-Sorry, Senpai…”

“Why’re you apologizing?”

Awake, Sumika bowed to me.

“You said I was cute, but I…”

“You are cute. Why apologize?”

“I-I can’t… make you feel good or anything…”

She teared up.

(Oh… This feels familiar. She cried like this before.)

But I’m not that guy anymore.

“That’s not true, Sumika. Making a girl feel good, seeing her happy—that’s what thrills me most.”

“Huh?”

“I’m super satisfied seeing your cute side.”

“S-Senpai…♡”

“So…”

With a girl this adorable, the student council might not be bad.

“Mind if I join the council?”

Smiling at her, I asked. Her response—

“H-Hai…♡”

Blushing furiously, she nodded vigorously, sealing my acceptance.

※

While I joined the student council, the day of the Grand Master—Kazuma Saionji’s—arrival loomed.

Age 46, 170 cm, slim, frail from illness, overly gentle, deemed unfit as family head…

That’s from the dossier. He seemed approachable.

But this was the elite world, a realm of unfamiliar norms. I’d need strong resolve to face it.

As I thought this, Ayaka-san, her belly swollen, spoke soothingly beside me.

“You’ll be fine, darling. Father will understand.”

“For you and our child, I’ll do my best.”

In formal attire, I gripped her hand, renewing my determination.