How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 38

Chapter 38

My girlfriend, Satsuki-chan, is pregnant. While I’m grateful for the new life growing within her, the idea of marriage complicates everything.

When she told me, I couldn’t bring myself to promise marriage, instead dragging out my response with vague delays.

※

“You don’t have to stress about it, you know.”

Those words came from Nao Tsukihara, Yukino’s younger sister and, in a way, my second girlfriend. I was at the Tsukihara house, helping Nao study for her high school entrance exams.

“I’d be happy just being with you, Onii-chan, without marriage,” she said.

“Nao…”

I confided in her because she calls herself my “step-sister,” keeping a slight distance in our relationship, which makes her easier to talk to.

“But don’t most girls dream of marriage?” I asked.

“Sure, but what really matters is whether you end up happy, right?”

Happiness as the ultimate goal… She had a point. Still, if I married one, wouldn’t the other feel inferior? And if I had to choose, it’d be Ayaka-san, trapped in a marriage with a cruel man she can’t escape.

“So, taking responsibility is more about how you feel, isn’t it?” Nao added.

“Hmm…”

I half-understood, half-didn’t. Not grasping the feelings of the girls I cherish left me uneasy.

“Hey, how about we have some fun, Onii-chan?” Nao teased, shifting gears.

“Whoa, we just started studying! Keep this up, and you won’t get into our school.”

“Nuh-uh! I don’t wanna miss out!” she pouted.

Nao struggles with academics. Our high school’s free-spirited vibe requires only average entrance scores, so with effort, she could make it.

“You’re smart when you try, Nao. Plus, seeing Yukino and Riria every day at school would be fun, right?”

“And you too♪”

“Yeah. Good girl,” I said, patting her head. She squinted like a contented cat, leaning into my touch.

“If I do well, we’ll have lots of fun, okay?”

“Haha! Guess I’ll super try, then~!”

“Geez,” I laughed.

She’s adorable. Taking a page from Miyabi-san’s teaching style, I coached Nao, weaving stories to make the material stick.

※

Days later, still without an answer, a seismic shift was about to hit my routine life.

“Phew…”

“You seem tired, Master,” Miyabi-san observed.

“Not really… Nothing compared to your workload, Miyabi-san.”

My exhaustion was mental. Managing the estate, overseeing Ayaka-san’s health, and tutoring me—Miyabi-san’s burdens dwarfed mine.

As I mulled this over—

“Miyabi-sama, a guest has arrived!” a maid rushed in.

“There was no such appointment.”

“It’s… well—”

The maid whispered something to Miyabi-san, who raised an eyebrow slightly and bowed to me.

“My apologies, Master. I must attend to this guest.”

“No problem at all. I’ll review my notes.”

“Thank you. Excuse me.”

Miyabi-san left.

(Man, she’s got it rough. Not like I can help, though.)

The least I could do was study hard to ease her load. I flipped open my notebook, going over today’s lessons.

…

Something was off. A few minutes into my review, loud voices echoed from the entrance.

(What’s that? Never heard this before.)

Worried something troublesome was brewing, I stood and quietly headed toward the foyer.

“Let me through, I said!”

“My apologies, but no matter how noble, we cannot allow unannounced entry into the Saionji estate.”

“Tch… You insolent maid…!”

A woman was arguing in fluent English, demanding entry.

(That voice… Sounds familiar…)

Curiosity piqued, I peeked around the corner.

“There you are!” she exclaimed.

“Wha—Leonora-san?”

It was the emerald-haired beauty I’d met on Waheide Island.

“Oh, it’s been a while, hasn’t it?” another voice said.

“E-Eh!? Queen Rosecia…!?”

There stood the intense, action-driven monarch who’d kidnapped and confined me to rejuvenate her body.

“Why are you here?”

“See? We know him,” Leonora said, puffing out her chest triumphantly.

Miyabi-san remained unfazed. “Being acquainted doesn’t justify an unannounced visit, does it?”

“Grr…” Leonora faltered.

The two locked eyes, tension crackling. Leonora seemed slightly cowed—no sword in Japan, perhaps realizing she couldn’t outmatch Miyabi-san unarmed, she kept her distance.

“Enough. He’s right there—ask him,” Rosecia interjected.

“Me?” I blurted, sounding foolish.

Embarrassing. But keeping a nation’s queen waiting at the doorstep was nerve-wracking.

“Uh, Miyabi-san… Can we let them in?”

“May I also request this?” a voice added.

“Huh?”

From the back of Rosecia’s entourage stepped another woman.

“Carla-san!!”

“Hehe, long time no see,” said Carla, the matriarch of the Waheide household where I’d stayed, Maya’s mother.

“Why are you here?”

“Her Majesty sought someone familiar with Japan. I thought I could help. Plus… I missed my girl.”

“Haha, yeah, Maya’s gonna flip!”

Imagining Maya’s joy warmed my heart.

“So, Miyabi-san…”

“Understood. With Master’s permission, I welcome our guests.”

“Tch, this woman…” Leonora muttered, glaring at Miyabi-san, clearly irked that her words held no sway.

“Kuhaha! No matter. I like her. Too fine a talent for this shabby estate,” Rosecia declared.

“Please, this way, Queen Rosecia, Lady Carla,” Miyabi-san said smoothly.

“Hmm.”

“Thank you.”

Leaving Leonora behind, Rosecia and Carla followed Miyabi-san, accompanied by the rest of the entourage.

This left me alone with Leonora.

“So, uh… Long time, huh, Leonora-san?”

“Y-Yeah… You look well…”

Her expression was awkward, almost pained. Understandable—our first meeting involved her threatening me with a sword, stripping me, and a near-rape encounter.

“Guarding Her Majesty?”

“Yes… She insisted on seeing you.”

“Wow, coming all this way… Tough job, huh?”

I tried to lighten the tense air with small talk. She shook her head. “No.”

“I asked to come.”

“Huh?”

With that, she brushed past me, muttering, “Idiot,” before vanishing into the estate.

※

Queen Rosecia reclined on a drawing room sofa, waiting for me.

“You’re finally here. Sit.”

“Is that… okay?”

“It’s fine.”

I settled onto the opposite sofa, half-expecting a cry of “Insolent!” to erupt.

“Why so tense?”

“Well, I’m in the presence of Your Majesty…”

“That maid was far bolder.”

“Miyabi-san… She’s exceptional.”

Miyabi-san seemed unfazed by Rosecia’s royal status. Facing a queen and her retinue without flinching? I couldn’t match that.

(I’m such a pathetic guy…)

“Hmm, no matter. More importantly, can you prepare a room? I’m weary from the journey.”

“Uh… This isn’t my house.”

“I’m not asking for the grandest suite. Or do I need permission? Shall I call your prime minister?”

“No, no, no! That’s way too much!”

How did a simple room request escalate to the prime minister?

“Then hurry up.”

“The owner’s Saionji Ayaka-san, so I’d need to ask—”

“Pardon me. I am Saionji Ayaka, mistress of this house. Pleased to meet you, Queen Rosecia of Waheide,” Ayaka-san announced, entering.

“Hmm, raise your face. You’re with child? Good, good, sit comfortably,” Rosecia said, noting Ayaka’s pregnancy and gesturing to a chair.

“Your graciousness is appreciated.”

“Now, I’d like a room in this estate.”

“Yes… But is that suitable? As you see, our home is modest, hardly fit for royalty.”

“No matter. It’s better than a hotel, and your staff is well-trained.”

“I’m honored by your praise.”

I listened, awestruck.

(Wow, she really is a queen…)

Calling this estate modest baffled my commoner sensibilities, but compared to her golden palace, maybe it was.

As I pondered this—

“You’ll host me for a while, then,” Rosecia said.

“It’s the utmost honor to host Your Majesty, the living jewel,” Ayaka replied.

“Hmm, Ayaka, you’re quite the woman. No wonder he’s smitten.”

“Wha!?”

How did she know? I hadn’t spoken to Ayaka since Rosecia arrived.

“How could I not? Who do you think I am?” Rosecia said.

“Impressive…”

I didn’t fully get it, but her keen insight and vast experience showed a gulf in our stature.

“We’ll talk more tonight. I’m tired.”

She glanced at a maid, who bowed, saying, “This way,” signaling a room was ready. Rosecia stood and left.

“Phew… That was intense,” Ayaka said.

“Hehe, your tone surprised me more,” I teased.

“Was it off?”

“No, her leniency means she likes you.”

“Maybe…”

We’d shared intimacy once, but no contact since. Her tolerance of my clumsy replies likely stemmed from her good mood.

Relieved it wouldn’t escalate like before, I relaxed.

※

Next came a heartwarming reunion.

“Mom!!”

“Maya…”

Maya, barefoot, must’ve sprinted here. She dove into Carla’s arms, nuzzling her chest.

“Geez, Maya…” Carla chuckled, stroking her head.

“Happy for you, Maya.”

“Thanks, Nii-cha!!”

I hadn’t done anything, but her sparkling smile captivated me.

(She’s been lonely.)

Though we see each other daily, Japan’s foreign to her. Her Japanese is still shaky, and while she’s started middle school, she hasn’t quite settled in.

(If only Carla could stay…)

But their wooden house would decay without care.

“How long can you stay?”

“!!”

“While Her Majesty’s here, so not long, I think,” Carla said.

“I see…”

A queen can’t linger—maybe a week, I figured.

“Mom…”

“Don’t look so sad. You promised to be strong without me, right?”

“Yup…”

“Then smile, even when I’m gone.”

“Yup.”

Maya nodded happily, clinging to Carla.

“Maybe let her indulge while you’re here?” I suggested.

“Hehe, always so kind,” Carla said.

“Nah…”

Maya’s happiness makes me happy. That’s all.

Watching their tender moment, I smiled from the heart.

※

“You’re to stay the night,” Leonora relayed from Rosecia.

“No problem.”

(I’ll let my parents know. They trust me, so it’s fine.)

Since topping my grade, they’ve been even more lenient—though I had to stop them from thanking Miyabi-san directly. I asked Leonora to pass on my agreement.

“Time to prep for a massage…”

Recalling Waheide, I showered, changed into thin, pocketless clothes to avoid weapon suspicions, and gathered oil and towels.

“Her Majesty summons you.”

“Yes, right away!”

As Leonora arrived, I quickly packed my supplies.

“What’s that?”

“Massage tools…”

“Hmm, fine—no issues. Come.”

After a brief check, I followed her down the hall to the estate’s grandest guest room.

“Your Majesty, he’s here.”

“Enter.”

The familiar exchange felt nostalgic. I entered, bowing with a brief greeting.

“So, you assumed a massage?” Rosecia said.

“Was I wrong?”

“I don’t feel the need now.”

She was radiant, her natural beauty enhanced by skin that gleamed like moonlight—a true “black jewel.”

“More importantly—that’s pao fruit oil?”

“Yes, but…”

“Edible or not, it faces high tariffs. Don’t flaunt it.”

“Wha!? I didn’t know… Sorry!”

“No matter. But you’ll make it up to me.”

Her face lit up like a predator spotting prey.

“How—”

“Show it. Your cock. Now.”

“Ugh…”

“Hurry up!”

“Uwah!!”

Impatient, she yanked down my shorts, seizing my dangling member.

“Hoo… This is it…♪”

“Ack…!”

“Suu… Haa♡ Oh, it’s pulsing… Growing bigger…”

“Kuu… Aa…”

Gripping my cock like reuniting with a lover, her eyes sparkled. Her excitement… turned me on.

“Ohh… Even manlier than before♪”

“Your Majesty…”

She rubbed my rapidly hardening cock, talking to it.

“Suuu~~~ Haa♡ Suuu…♡”

She sniffed it repeatedly, filling her lungs.

“Uh… What’s this about?”

“What? A peerless beauty craves your cock, and you don’t want to fuck her?”

“N-No, I…”

Sure, I want sex, but not violently. I don’t want to ignore a woman’s feelings for my own pleasure. Seeing my hesitation, she pressed.

“What’s wrong? Got a problem?”

“Well… It’s just…”

“Suu…♡ Speak.”

“Okay…”

I spilled everything—my situation, my dilemmas—while she held and sniffed my cock, a minor detail in the moment.

“She asked me to take responsibility…”

“Hmm? Suuuu~~~♡ Nhaa…♡”

“I talked to another girl, who said it’s about feelings…”

“Sniff sniff…♡ She’s not wrong.”

“Right? If I consider their feelings—”

“What are you saying?”

She cut me off, dismissing my point.

“Are you an idiot?”

“Huh?”

I stood dumbfounded.

“Haa…♡ You’re hopeless…”

“What do you mean?”

“It’s about your feelings, fool.”

I was lost. Why my feelings, not theirs?

“You love them, don’t you?”

“Yes…”

“Then take both. Simple.”

“If only it were that easy…”

“You give up because your feelings are that weak.”

“…”

Her words pierced my heart like a needle, leaving me speechless.

“Calling it their feelings? That’s just dodging responsibility.”

“…”

“If you’re serious, a real man would do anything to claim them.”

She gripped my cock harder.

“Agu…!?”

“Is your body and cock all you’ve got?”

“Uuu…”

She was right—I’m immature. Instead of fighting for what I want, I delayed, wallowing in self-pity.

Ashamed, I could only look down.

“But expecting a young guy like you to figure that out alone is harsh…”

Her stunning face turned to me, her captivating eyes locking onto mine.

“Let me make you a true man.”

“Huh…?”

Before I could ask, she acted.

“Leonora, bring it.”

“Yes!”

“Ugh…!?”

Dreadful memories surfaced—was it that drug again?

“Relax, no drugs. They’re not easily smuggled.”

“Phew…”

“Here, Your Majesty.”

“Good.”

“T-That’s…”

A rope. Was I to be bound and violated again?

“What’s on your mind? This isn’t for you.”

“Huh? Then what?”

“Leonora, tie me up. Tightly.”

“???—Yes!!”

Leonora, skilled at restraint, swiftly bound Rosecia to the bed. Now I was the one confused.

“What’s this mean?”

“Can’t you tell? I’m completely helpless.”

“Yes…”

“What’s wrong? A beauty’s offering her ass right in front of you.”

“…”

Her round, ample ass swayed enticingly.

(Gulp… Looks so soft… If I grabbed it and plunged into her pussy…)

The thought made my cock throb, veins bulging.

“Before you is Rosecia, Queen of Waheide, the world’s most beautiful woman.”

Her ass danced, begging for attention.

(Incredible… That feminine scent… Sweet, thick, primal…)

Her thighs glistened with dripping honey.

(I want her. I want to fuck her. Want, want, want—But…)

Violating a bound woman… That kind of rough sex…

“Why hesitate?”

“Kuuu… Haa… Haa…”

Her voice was divine. How amazing would it be to turn it into a lustful moan?

“I told you—want her, take her.”

“Resolve…”

“Yes. Make her fall so hard she’ll never leave you. Devour her with resolve.”

“Never leave…”

Could I make Ayaka-san and Satsuki-chan happy that way?

“It’s up to your resolve.”

“U… U, gu…”

Desire surged. Imagining ravishing the girls I love, claiming them fully.

“Take everything or give up♪”

“U… Uoooh!!”

Give up? Never. I love them too much. Hold back? Impossible. I want to claim them.

“Kufufufu…♡”

Yes, this beauty before me—I’ll make her mine.

With eyes blazing with desire, I reached for R-o-s-e-c-i-a.