How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 15

Chapter 15

“Ayaka-san…?”

Standing there was the refined lady of the Saionji family, whose status had just hit me hard.

“Is something wrong, sensei?”

“No, it’s just… um…”

“Am I troubling you?”

Troubling? Never. It’s just a vague unease in my heart.

“If you have any complaints about me, please tell me… I’ll do anything I can.”

“Complaints? No way, Ayaka-san!”

It’s not her fault. I’m just chickening out.

“Then why aren’t you embracing me like usual?”

Her sad expression stings.

(Ugh, I’m pathetic, making such a wonderful woman sad.)

Making a woman sad is the worst sin. My shame doesn’t matter.

“I… thought I wasn’t worthy of you.”

“What do you mean?”

I confess honestly: the tea party made me realize our worlds—status, ability—are too different.

“I worried touching you would be a bother.”

“No! Don’t say that…”

Ayaka’s hand, rubbing her belly as usual, trembles with distress.

“I have someone important to me…”

“Who…?”

“She loves me too.”

“…”

Ayaka stops rubbing her belly, tears welling up. My chest tightens, but I continue.

“But I’ve fallen for you too, Ayaka-san.”

“…What?”

What am I saying? This is just a cheater’s selfish excuse.

“You’re beautiful, mature… but your innocent side is so cute.”

“I’m not…”

“Your shy kisses, the way you hold back during sex—it’s endearing.”

Is this a confession or a sin? I might get kicked out.

But this is my truth.

“I love you, Ayaka-san.”

“No one’s ever said that to me before.”

“Not even your husband?”

“I… we drove him out, me and Miyabi.”

She mentioned separation, but “drove out” sounds intense.

“He only said cruel things.”

“Words that hurt you… I can’t forgive him either.”

“That’s why I decided to give myself to you…”

“What?”

Her words exceed my imagination, leaving me stunned.

“I’m just a student, I can’t do anything!”

“You saved my life, and—”

She locks eyes with me, resolute.

“I’ve fallen in love with you. It can’t be stopped, can it?”

Unstoppable. Exactly. No reasoning can halt love.

“I can’t stop either… This feeling won’t change.”

“Then it’s fine, isn’t it? Two people in love don’t need to hold back.”

“No holding back… really?”

“Yes. Nothing should stand between us.”

Then I’ll be true to my feelings. I’ll make this perfect woman mine.

“Ayaka-san…!”

I embrace her, pushing her onto the tatami.

“Hyan… Hold me tighter!”

“Haa, haa, Ayaka-san… chu… churu, jururu!”

“Nnn…! Churu, chupa♡ Chupu♡ Haa, haa♡”

We cling to each other, devouring each other’s lips.

Her beautiful face, so close, captivates me.

“I can’t hold back anymore.”

“Fufu♪ Here are your favorite breasts.”

“Ah!”

She guides my hand to her breasts, their softness and warmth flooding my senses.

A tingling sensation shoots through my hand.

“Ahn♪ It’s like… electricity… Haan♡ Nn, nhaa♡”

Maybe because she’s giving herself to me, it feels like her breast’s nerves connect to my hand.

Munyu♡ Munimuni♡ Gunyu♡

“Hau♡ That… amazing♡ Au…♡”

“Ah, haa… uaaa…!”

Each knead sends a current through my hand, pleasure signals hitting my brain.

(I can feel her sensations flowing into me…)

“Are my breasts that good?”

“Y-Yes… they feel amazing.”

“Then make them yours. This body is yours now…”

Ayaka slips off her kimono.

I grab her round, soft breasts, kneading them eagerly.

“Nhaa♡ My breasts… crushed…♡”

“It’s okay. Trust me.”

My grip is perfect, just shy of pain, kneading with lewd intent, not a massage.

“Oh♡ My breasts… burning…!”

“A special massage for the one I love.”

Guniii♡ Munyu♡ — Kuri♡ Kurikuri♡

“Hiiiin♡ Not the tips…♡”

“Your pleasure’s flowing into my hand!”

My hand aches like it’s an erogenous zone. She’s feeling this directly—she can’t endure it.

Munyu♡ Gyu♡

“Ah♡ Ah♡ Ah♡ I’m coming… I’m coming! Haaa~~~n♡♡♡”

Ayaka climaxes, her cute voice echoing as her body arches, convulsing.

“I can’t take it!”

Already on the edge, I shed my yukata and climb onto her heated body.

“I’m going in! Ah, it’s hot… and slick.”

“Nnu♡ Ah♡ It’s entering… Kyan♡”

Her pussy, melted with arousal, drips love juices, soaking the tatami as I enter.

Nuchu♡ — Pachun♡ Pachun♡ Pachun♡ Pachun♡

“Nn♡ Ahn♡ Nn♡ Nn♡ Nnn♡”

“Haa, haa, haa… Your pussy’s sucking me in…!”

“So… embarrassing…”

Not a tight, greedy pussy, but a gentle, enveloping one, like being held by her soft breasts.

Pachun♡ Pachun♡ Pachun♡

“Ayaka! Ayaka! Ayaka! I love you!”

“Ahn♡ Call me… Ayaka♡”

“W-What? That’s… too much…”

“I want you to.”

We’re a forbidden pair—different ages, statuses, and she’s married. Calling her by name feels wrong.

“Then… just for now, be my husband…”

“Just for now… playing husband and wife?”

“Yes♪ Just pretend.”

If it’s pretend, it’s fine. I can call her by name.

“Ayaka… I’ll make you feel so good.”

“Yes, darling♡”

When I say her name, she beams like a flower blooming, a girl granted her deepest wish.

Her pure, innocent beauty makes me fall completely in love.

“Ayaka! I love you! I love you!”

Paan♡ Paan♡ Paan♡ Paan♡ Gunyu♡ Munyumunyu♡

“Ahn♡ Ha♡ Ha♡ Ha♡ Nnnu~~~♡”

I thrust wildly, kneading her breasts, desperate to claim her. My cock burns, my arms’ nerves nearly frying.

(I want her, want her, want her.)

She’s another man’s wife. I know this wish can’t come true. I’m jealous—envious of the man who married this beautiful, delicate woman.

“Ayaka… you’re mine! I won’t let another man have you!!”

Dochun♡ — Dochu♡ Dochu♡ Dochu♡

“I’m♡ already yours♡”

Gugugu… Dochu♡ Dochu♡ Dochu♡ Dochu♡

“Ahh♡ It’s getting bigger♡ Swelling inside… Aaaahn♡”

“Gu… Ohh! My cock… my balls are gonna burst!”

My balls, crazed, pump semen into my cock.

“Haa, haa… Cum… cum inside me♡”

“Ayaka…! Uh, aah!!”

“Gaaa! Get pregnant, Ayaka! With my seed!”

“Ah, hot…♡ Your seed… spurting so much♡”

“Oh… aaah… melting…”

The ejaculation’s intensity fries my brain. I don’t even know what I’m saying, my rationality gone.

My brain shuts down, my lower body moving on its own, obsessed with the woman before me.

Dochun! Dochun♡ Dochun♡ Dochun♡ Dochun♡

“Naa♡ Darling♡ You want more♪”

“Haa! Ha-ha-ha! …Uooo!”

I keep thrusting through ejaculation, driven by the desire to impregnate her despite already cumming.

“Darling… my husband♡ I’ve waited so long♡”

“Ayaka! Ayaka! My… Ayaka!”

“Yes, love me more♡”

Love overflows. My body moves on its own, pounding my cock into her.

Paan♡ Paan♡ Paan♡ Paan♡

“Niii♡ Darling♡ Thrust harder♡”

Paan♡ Paan♡ Paan♡ — Dochun!!

“Hoo♡ Hoo♡ Hoo♡ Hoooon♡”

— Dochun♡ Dochun♡ Dochun♡ Dochun♡

“Ayaka, I want you!”

Zuchun♡♡♡

“Haoo♡ Oh… I’m coming♡ I’m coming… Nhaa~~~a♡♡♡”

My final thrust sends Ayaka to climax. Usually shy about lewd sounds, her joyful cries echo beyond the room.

My cock sprays semen into her womb, byurubyuru♡, with absurd force.

Her pussy, filled to the brim, leaks semen with each spurt, dobodobo.

“Ku! Uh! Ayaka… so beautiful. I… I…”

Tears well up as I cum.

“Darling… no, sensei…”

“Ayaka-san… ugh…”

Like a spell breaking, we return to our usual dynamic.

“Can I keep loving you?”

“Of course, sensei.”

I collapse onto her, nuzzling her neck, inhaling her sweet scent, whispering.

“Can we do it again?”

“Yes. Let’s play husband and wife again♡”

“Yeah… just pretend, right?”

We chuckle together.

…

Knock knock

“—Nn?”

“Sorry to disturb you so late.”

After intense sex, we’re naked, cuddling under the futon. As Ayaka starts to doze, Miyabi slides open the fusuma.

“Eh! Uh, this is…”

We’re caught. A clear scene of infidelity.

“Please calm down. I saw nothing.”

“What… does that mean?”

A naked man and woman, post-creampie—there’s no excuse. I panic, unsure what to do.

“It’s fine. Follow me quietly.”

“Y-Yes… okay.”

Careful not to wake Ayaka, I cover her with the futon, slip on my yukata, and leave.

“This way.”

Miyabi leads me to a (relatively normal) bedroom in this mansion.

“Where’s this?”

“My private room. I thought we’d have a little secret talk. Fufu.”

Miyabi, always stoic, smirks, her doll-like beauty both stunning and eerie. Her overwhelming presence freezes me, but she starts talking.

“Where to begin… Let’s start with the Saionji family.”

The Saionji family, with a mere thousand-year history, traces back to Japan’s noblest bloodline, wielding immense influence in politics and business, with over 100 global companies.

“The current head is Ayaka-sama’s grandfather.”

“That’s incredible…”

“And Ayaka-sama is the only daughter of his heir.”

“No siblings?”

“No, her father was frail, and Ayaka-sama was his only child.”

(Primogeniture? Sounds complicated.)

Miyabi, sensing my expression, keeps it brief.

“To secure an heir, they adopted a son-in-law from another family.”

“Her husband?”

“Yes. His family, though lesser, is also noble.”

“I see.”

My chest tightens with irritation.

“Thus, divorce is impossible.”

“…”

To avoid disgrace, I suppose. A divorcee in high society would be shameful.

“So… I drove him out.”

“What?”

“I have ample evidence of his filthy hobbies, so I used it—”

“Wait, wait…”

A maid ousting her master? She’s right here, but she’s terrifying.

“Why drive out the master?”

“I’m Ayaka-sama’s maid, duty-bound to her husband.”

“Yes.”

“But he didn’t treat her as a wife. So, he’s not my master.”

She serves only the Saionji daughter. But is that okay?

“Did the Saionji family approve?”

“It’s fine if it’s not exposed.”

“Uh…”

“If his… illicit activities were revealed, he’d be ruined for lifetimes.”

“…”

“Or rather, I’d personally—”

“Okay, that’s enough.”

Her anger is clear.

“I get the gist.”

Miyabi’s been pushing me and Ayaka together. Why a commoner like me? It suits her plans.

“What should I do?”

Keep cheating with someone who can’t divorce?

(I’m okay with that, but…)

“Ayaka-sama is pregnant.”

“Pregnant?”

“She’s with child.”

“With who?”

“Ayaka-sama.”

I don’t get it.

“…Whose?”

“…Ayaka-sama and that man haven’t tried for a child in over six months.”

“So… mine…?”

“No.”

“Then someone else…?”

“No.”

Not mine, not someone else’s. What?

“It’s Ayaka-sama and that man’s child.”

“Didn’t you say they haven’t…?”

“Catch on, please.”

To avoid trouble, it’s officially her husband’s child. So, it’s mine but not mine.

“Ayaka-sama intends it that way.”

“That’s why she didn’t tell me…”

“The child will be the Saionji heir.”

It’s complicated. I’m thrilled she’s carrying my child, but I can’t celebrate—I’m an outsider.

“What should I do…?”

“Give up on her. Walk away, and your life stays as it was.”

“No way… that’s crazy…”

I can’t give her up. I want her from the depths of my heart.

“I don’t want to give up… Is there a way?”

I know nothing of high society. My only hope is Miyabi. I stare at her earnestly.

“Fufu, fufufu. Good. Then follow my instructions.”

“Of course.”

“You’ll acquire the bare minimum as a commoner: exceptional looks, physique, intellect, and character. Without those, the elite won’t notice you.”

“That’s the minimum…?”

That’s what status differences mean. To be Ayaka’s partner, I need those.

“Don’t worry. With my guidance, it’s easy.”

She smiles, genuinely amused.

(Scary.)

I can’t say it aloud.

“First… let’s practice nighttime duties.”

Miyabi bares her shapely hips on the bed.