How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 24

Chapter 24

I’m diligently attending classes today. My grades have soared—no longer an average student, I ranked third overall in the second semester’s final exams.

“(He’s been amazing lately… He used to be just an ordinary guy.)”

“(Now he’s smart and good-looking…)”

“(He’s dating a model, you know? No way you’d have a shot.)”

“(Tch, that’s not what I meant…)”

Lately, I’ve been feeling eyes on me in class, and I sense rumors swirling. Maybe they suspect cheating since my grades skyrocketed.

(A teacher mentioned it before.)

Sure, cheating would be a logical suspicion, but my study volume and quality are legit. When a doubting teacher quizzed me, I answered flawlessly, and they flipped to praising me.

“My physical abilities have improved too…”

In today’s PE class, we ran sprints. My sister Ai excels at track, but I was never particularly fast—until now.

“Join the track team? You could go far.”

“Nah, I’m swamped with studies. Sorry.”

A track team classmate invited me. Miyabi-san’s cutting-edge coaching has boosted my strength, but her self-defense training, teaching precise body control, is the real game-changer. Swift movement is the foundation of most sports.

(Ball sports, though? Still a weak spot.)

Those require time and talent beyond raw athleticism.

“Getting scouted for track? That’s impressive.”

“Hm? Yukino, huh.”

Turning, I see Yukino in her gym clothes.

“As you heard, I’m too busy for clubs.”

“Hmm, makes sense.”

Yukino knows about my clinic and my training with the Saionji family.

(Yukino without glasses looks fresh and cute…)

While chatting, I’m captivated by her beauty. She’s not great at PE, but her serious nature pushed her to run until drenched in sweat, her gym clothes clinging to her skin, faintly revealing it.

“I’m sweaty, so go ahead without me.”

Our destination is obvious: the library storage room. She needs time to change, so she’s telling me to go first.

“Hmm…”

If she wipes off sweat and changes into her uniform, we might miss our lunchtime sex session. So—

“Why not stay like that?”

“Huh?”

We can change after sex.

Thus, I head to the storage room with Yukino, still in her gym clothes.

…

“Aa♡ Nn♡ Nn♡ Nnu♡”

I’m having sex with Yukino in her gym clothes. They’ll be washed anyway, so no harm if they get dirty.

Pako♡ Pako♡ Pako♡ Pako♡

On a mattress kept for sex, I lie back as Yukino, dripping sweat, bounces atop me.

“Ann♡ Hey… I’m not too sweaty?”

“Not at all. It smells good, actually.”

For some reason, a beautiful girl’s sweat smells amazing to me. Each drop falling on me fuels my groin.

“Nnn! It’s… getting bigger inside…♡”

“You’re too cute, Yukino. I can’t hold back…”

“Haa♡ Haa♡ Haa♡ I… might cum soon…♡”

Lately, the women I sleep with climax easily. Is it my enhanced cock or my ability? I’m not sure. But seeing their cute faces in ecstasy is a win.

“Aa…! Ii, I, I’m cumming… I’m cumming…♡”

“Go for it. I’m shooting my first load too!”

Watching Yukino’s pre-climax face sends a numbing pleasure through my hips.

(She’s feeling it so much… Her whole body’s screaming ‘feels good.’)

Pachun♡ Pachun♡ Pachun♡ Pachun♡ — Dochun♡♡♡

“Ann♡ I’m… cum, cumming~~~♡ — Aaa♡♡♡♡”

Yukino’s body quakes, her pussy gripping my cock gyu♡ tightly.

“Yukino… uu…”

With her climax, my cock unleashes a torrent of semen. Byukubyuku♡, thick white fluid fills her vagina, excess spilling out.

“Aa♡ Aaa♡ Ahaa♡♡♡”

Drained by pleasure, Yukino collapses onto my chest.

(So soft… and that sweet sweat smell… mmm.)

“Your muscles are amazing…♡ Aa…”

Post-ejaculation, I’m rock-hard again. Lately, my stamina’s so high that I recover instantly, ready for more.

“Yukino-chi, my turn♪”

Riria, who was eating her homemade lunch while watching us, calls out. They take turns eating and having sex with me.

“Okay… Riria-chan, I’m switching now.”

As Yukino stands, a flood of semen gushes goboo♡ from her pussy.

“Wow♡ Tasty-looking semen♡”

Riria licks her lips.

(My semen’s not dessert…)

“I want to eat lunch too.”

“Sure. Let’s do it while eating.”

With only one body, I multitask—sex and lunch.

“Here’s today’s bento.”

“Thanks, Yukino.”

Yukino and Riria alternate making me love-filled bentos daily, both skilled cooks, a highlight of my day.

“Let’s start. Here’s my pussy, go for it♪”

Riria provocatively spreads her pussy.

I open the bento box to sate my appetite while sliding my cock into her.

※

“I’m going a bit harder, Nozomi-chan.”

“Nn!! Haa…♡ Aa… my head feels all fuzzy…”

Over two months have passed since starting Nozomi-chan’s eye treatment. Initially, light breast kneading overwhelmed her, but now she endures stronger stimulation.

“Just a bit more.”

(Her optic nerve repair is nearly complete…)

My senses suggest she should be seeing by now. If she isn’t, something’s missing.

“Nozomi-chan, do you trust me?”

“Sensei? Of course I trust you.”

“Thanks. I’m going to grip really hard—can you handle it?”

“Yeah! If sensei says so, I’ll endure it…”

Nozomi trusts me completely, surrendering herself. So, I pour all my ability into my hands and grip her breasts tightly.

Mu, gyuuuu♡

“Ii…! Auu. Nuuu~~~♡”

Nozomi cries out in pain. I quickly adjust, turning pain into pleasure.

Guu, gyu, gyuuu…♡

“Aa… Aaaaa~~~♡”

With a powerful stimulus, Nozomi stiffens, letting out a cute cry.

“Aa… haa♡ haa♡ haa♡ — hahee…♡”

Her unfocused eyes widen, her body trembling.

“You okay, Nozomi-chan?”

Worried, I speak gently.

Her heavy breathing echoes.

(Was that too much…?)

Concerned, I lean in to check her expression. Then—

“Sen… sei…?”

Her once-lightless eyes sparkle.

“Nozomi-chan?”

Her gaze locks onto mine.

“Faa… It’s sensei…♡”

“Nozomi-chan! Can you see?”

Staring at me, she looks astonished.

“I can see… I can see sensei’s face…!”

Tears well in her eyes, sparkling as they roll down her cheeks.

“Sensei… my sensei. I love you.”

She wraps her arms around my head, pulling my face close.

“Ah!”

Stunned by the miracle and her beautiful eyes, I’m captivated.

“Sensei… chu♡”

“Nn… amu…”

“Chu♡ Haamu♡ Sensei… I love you♡”

Unfamiliar with kissing, she licks my lips repeatedly. Finding her adorable, I pat her head.

No impure thoughts arise.

I keep stroking her head, accepting her clumsy affection until she calms.

…

Ton ton ton

In an ordinary house, someone descends the stairs.

“Morning, Papa, Mama!”

“Morning, Nozomi.”

Nozomi’s parents sit at breakfast, beaming with teary eyes.

“Going to school alone?”

“Of course! I don’t need Mama anymore!”

“My!”

Nozomi giggles, and her parents laugh too.

A peaceful daily life, an ordinary family—things once thought unattainable.

“A true miracle.”

“Yes…”

They murmur, watching Nozomi eat bread eagerly.

“Oh, gotta send sensei today’s photo…”

Nozomi grabs her smartphone, switching to camera mode.

“Nozomi’s doing great today!”

Click

She snaps a smiling selfie and sends it via a messaging app.

“And…”

She adds a line and sends it.

“Nozomi really loves sensei, huh?”

“Yup!”

“Muu…”

This has become their daily morning routine.

(Thank you, sensei.)

…

“Hm?”

My phone buzzes in my pocket. I know who it’s from.

I pull it out, unlock it, and check the app.

“Nozomi’s doing great today!”

Another line follows:

“I love you, sensei♡”

※

I took on a fully blind girl’s treatment and successfully cured her—a miracle deemed impossible by modern medicine.

I hadn’t yet realized the impact this would have on the world.