How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 42

Chapter 42

I stood beside Ayaka-san, awaiting her father, Kazuma Saionji.

“Anything out of place?” I asked.

“Hehe, you’re fine. It suits you,” she reassured.

Wearing an unfamiliar suit, my bulky frame made me look less than polished.

“I think a rugged gentleman is far more charming♡,” she teased.

“Haha, praise from a beauty like you boosts my confidence.”

Her giggle, clear as chiming glass, eased the tense air, warmth spreading through my chest.

(Ayaka-san’s truly amazing…)

As we bantered, Miyabi-san arrived, announcing Kazuma’s arrival.

“Please wait here.”

The grand entrance, with its Taisho-era arched door, framed Ayaka and me as we stood slightly back.

Soon, footsteps approached, and the door opened with a click, revealing a middle-aged man.

“It’s been a while, Father,” Ayaka greeted.

“Ayaka… As beautiful as ever,” he replied.

Their father-daughter exchange unfolded.

I stood silently, not intruding.

“And this is the young man in question?” Kazuma turned to me.

“Yes… My beloved,” Ayaka said softly.

Finally, my turn to introduce myself.

“Seventeen… Young. But you’ve got a fine physique,” he noted.

“Thank you, Grand Master.”

“Heh, you’re not my servant. No need for such formalities.”

“May I call you Master Kazuma, then?”

“That’s fine.”

His elegant smile melted my nerves. With silver hair, refined manners, and a warm, mature charm, I felt a near-admiration for him.

“Tea is ready, everyone,” Miyabi-san announced.

“Thank you, Miyabi-kun. Shall we?” Kazuma said.

“Yes.”

We moved to a tea gathering, where Ayaka shared updates.

“Two weeks until my due date,” she said.

“A long-awaited son. Don’t overdo it,” Kazuma advised.

“Yes.”

The Saionji family follows primogeniture, with a tradition of male heirs.

“I was branded unfit to inherit,” Kazuma said, self-deprecatingly.

“That wasn’t your fault, Father…” Ayaka murmured.

“I was sickly from birth. Leading the Saionji empire was beyond me.”

The Saionji wield immense wealth, drawn from countless enterprises. The pressure on their patriarch is unimaginable.

Kazuma and his wife had only one child—Ayaka.

“I’m grateful you were born, Ayaka, but as a girl, you couldn’t inherit.”

An outdated rule, but I couldn’t say so. The nation’s elite clans uphold male-line succession.

“With no son, we had to find you a husband,” he continued.

“Yes…”

Ideally, they’d have kept the male line, but as a last resort, they sought a capable son-in-law from a noble family to produce an heir.

My teeth gritted.

“But it was a mistake,” Kazuma admitted.

“What?”

I’d assumed he supported it.

“Few houses match Saionji status, and fewer still have exceptional men. Choices were limited.”

“…”

“They valued ability, but personality was overlooked.”

I recalled Ayaka’s tears, her pain.

“We had no say,” she said quietly.

“The result—her illness, the worst outcome,” Kazuma said.

I remembered meeting Ayaka, her face twisted in suffering, tears streaming.

(Her husband, who should’ve cared most, was indifferent…)

“He had issues from the start,” Kazuma said, referring to that man.

“But his ability was unmatched. My father and the elders chose him for Ayaka.”

“What about her wishes…?”

“That’s how noble houses work.”

My chest tightened. Like a caged bird.

“I regret it,” Kazuma said. “Learning my precious daughter suffered like that…”

His saucer clinked, his anger breaking his gentlemanly facade.

“But by then, I had no options. If she’d borne a child, we could’ve separated them with an excuse…”

That man’s twisted proclivities meant he had no interest in having children with her.

“Ayaka fell gravely ill, losing her chance at a woman’s happiness—”

“…”

“Or so I thought.”

His anger faded, replaced by a gentle expression.

“Then you appeared.”

“Uh… Well…”

Honestly, back then, I thought I’d gotten lucky with a gorgeous married woman.

“I’m grateful, you know? For saving Ayaka.”

“Yes…”

“Hehe,” Ayaka giggled.

He’s an ally. That’s why Miyabi-san told him everything.

“So I’ve watched over you and Ayaka, ensuring your bond stays intact.”

“Yes…”

“And now, my grandson’s about to be born.”

“Yes.”

“Thank you.”

“Wha…?”

Kazuma bowed to me—a mere commoner who impregnated his only daughter.

“N-No, I just… fell for Ayaka and… got carried away…”

“Darling…♡”

“Thank you. Ayaka’s happiness is all thanks to you.”

I didn’t feel I’d done anything worthy. I’m the one who’s gained.

“But I’m just a commoner… Unworthy of her…”

“True,” he said.

“…”

“As a Saionji, that is. As a father, I only care that Ayaka’s happy.”

“Master Kazuma…”

His bright smile showed his sincerity.

“I had you investigated.”

My heart skipped.

“You’re quite the hard worker. Academics, fitness—above average.”

“Thank you.”

I felt relief, surpassing the elite’s standards for now.

“And healthy. Ever been sick?”

“No. Not even a cold.”

“Remarkable physique. I’m jealous.”

He eyed me appraisingly. Though not short at 170 cm, he was rail-thin, his limbs slender, waist almost feminine. My trained body was twice as robust.

“You’re quite… active with women, I hear?”

“Pfft!?”

I choked on my tea. How did he know that?

“It’s fine, you’re young. Fathering many children is a valuable trait.”

“Uh…”

So cheating’s okay? Miyabi-san said something similar…

“Unlike me, who failed to produce a proper heir.”

“But Ayaka-san’s here because of you.”

“Hm?”

“So… thank you.”

“…Hahaha, you’re an interesting kid.”

He laughed heartily, genuinely amused.

(He’s a good man… Worthy of being Ayaka’s dad.)

It was my first time bonding so closely with an older man, and I respected his character.

“But the rest of the Saionji won’t accept you,” he said, eyes lowering apologetically.

“!?”

It hit hard.

I knew it—a commoner joining their elite ranks was a pipe dream. Still, I’d clung to hope, piling up effort.

His words, from someone I respected, crushed me.

“Father…!” Ayaka gasped.

“Wait. They won’t now,” he clarified.

My sinking heart lifted.

“If circumstances change, there’s a chance. You must keep striving.”

“Yes! Absolutely.”

“It might be futile. Are you prepared?”

“I’m ready. I’ll make Ayaka happy, no matter what.”

“Good. That’s youth.”

Kazuma leaned back, gazing at the ceiling, as if recalling his own younger days.

“I’m prepared to devote myself to the man I love,” Ayaka declared.

“Understood,” Kazuma said.

“Thank you, Father.”

Her smile met his wry one, their father-daughter bond clear.

“I’ll support you, though my influence is limited,” Kazuma added.

As a failed patriarch, his authority was curtailed. Fundamentally, I needed to prove my worth to the Saionji.

“Having an ally means a lot. Right, Ayaka-san?”

“Yes, thank you, Father.”

“Yup.”

The talk wrapped up, shifting to casual chatter.

“I heard guests from Waheide are here?” Kazuma asked.

“Yes, Queen Rosecia and her entourage,” Ayaka replied.

“Hm… Is a woman named Carla among them?”

“Carla-san? Yes, she’s here as someone familiar with Japan.”

“I… see. Thank you.”

His gratitude sounded strained. Why did he know Carla? I wondered, when—

“Master…?”

“C-Carla…?”

Carla stood there, holding a tea refill.

“Ah… Carla…”

“It’s been a while, Master…”

“Yes… Five, no, six years?”

“Yes. Back then… I’m truly—”

“It’s in the past. And I was the one at fault.”

(What? They’re not just acquaintances… They were close?)

As I processed, their cryptic conversation continued, hinting at a past romance.

“You’re with Her Majesty now?” Kazuma asked.

“Yes, she treats me well.”

“That’s good.”

Six years—a long time apart. Their tones suggested they could never reclaim what was.

“Will you see Maya?”

“…Is that okay?”

“She might not remember you.”

“Haha, true. She was so young…”

His nostalgic voice and the way he watched Carla fetch Maya spoke volumes.

(What’s their history…?)

Carla mentioned studying in Japan and working at the Saionji estate. Not from a noble family, nor Japanese…

(No, stop. It’s not my place to pry.)

If they’re keeping it quiet, I should respect that. I sipped tea to cool my curiosity.

“Sorry for the wait. Maya, do you remember this man?” Carla returned, Maya peeking from behind her.

“Don’t know him. Who’s he?”

“…”

“Hey, he helped us when we lived in Japan.”

“Hm. Nice to meet you, mister.”

“…Nice to meet you, True Maya-chan.”

They weren’t close. Kazuma seemed disappointed.

“Hey, Nii-cha, feel my tummy!” Maya chirped, clinging to me.

“Hm?”

“Here♪”

“Like this…?”

I gently rubbed her lower abdomen.

“See? It moved—Nii-cha’s baby♪”

“H-Hey…!”

That’s not something to broadcast. Even if conceived abroad, we wanted to avoid rumors in Japan, as Carla and I had discussed.

“What’s that mean?” Kazuma’s voice trembled.

“Uh… I’m in love with her too… You know Maya, Master Kazuma?”

“…Yes, one-sidedly, I know her well.”

“I see…”

(Awkward… I’ve upset him. Now what…)

I fumbled, but Ayaka stepped in.

“Father, isn’t love free? Especially for True Maya, unbound by restrictions.”

“…You’re right. If you’re okay with it, I shouldn’t interfere.”

Her words calmed his anger.

“But answer this: What will you do with True Maya?”

“Make her happy. The happiest in the world.”

“And Ayaka?”

“Both of them—the happiest.”

It’s contradictory, I know. But it’s my conclusion—my ego.

A long silence followed, broken by Kazuma.

“You’re remarkable.”

“Huh?”

“Don’t see it?”

“No, this is just my selfishness.”

“True. But some men couldn’t do that.”

“Really…?”

“Yup.”

The conversation ended. I didn’t press further—outsiders shouldn’t meddle.

“Well, I should go,” Kazuma said.

“Father? Won’t you stay for dinner?” Ayaka asked.

“No, another time. Let him pamper you, Ayaka.”

“F-Father!” she blushed, looking down.

“I look forward to dining together, Kazuma-san.”

“No ‘-san.’ You’re like my son now.”

“Got it… Kazuma.”

“…Fine. See you again.”

Thus, Kazuma—my father-in-law—left.

Even I could guess their connection. But some stories are better left untold, kept as a beautiful memory rather than a messy drama.

With that thought, I saw him off.

※

Ayaka, stirred by the encounter, pampered me intensely.

“Nn♡ Nn♡ How’s this, darling♡?”

My aroused cock was enveloped by her lush breasts.

Munyu♡ Gunyu♡ Gunyu♡ Gunyu♡

“Kuu… That’s intense…”

“Hehe♡ These oppai you healed?”

“Too good…!!”

Her soft mounds teased my rod, sweet sensations zapping through my nerves to my hips.

Munyuu♡ Shuko♡ Shuko♡ Shuko♡

Seeing my expression, she beamed and launched into fierce paizuri.

“Here, here, here♡ Alternating like this♡”

“Auu… So soft… Plump… Kuu…!”

Ignoring milk leaking from her nipples, she moved her breasts up and down alternately, working my naughty cock.

“Haa♡ Haa♡ —Darling♡ My body’s yours♡”

Gunyun♡ Munyuu♡ — Gunyugunyuyu~~~♡

“Goo… That’s dangerous…!”

Her paizuri abandoned rhythm, her oppai dancing freely, crushing my cock.

“I love you, darling♡ Nn♡ Nn♡ Nn♡ Nn♡ N~~~♡”

“Uaa… Can’t hold it… Cumming…!”

“Here♡ Here♡ Here♡ Let it all out with your exclusive oppai♡”

“Aa~~~…”

Wrapped in her soft breasts, my cock erupted, spraying semen.

“Aan♡ So hot…♡ Your precious seed…♡ Jururu…♡”

“Ayaka… That spot’s sensitive now… Aa…!”

“Cum lots♡ The seed all the girls crave—my husband’s seed♡”

My love fueled endless semen, shooting dobyu♡ dobyu♡ from the tip.

“I love you, Ayaka… I love you the most in the world…!!”

“Aa…♡ You’re wonderful, darling…♡”

She squinted happily with each spurt.

It was lascivious yet as pure as a maiden’s smile.