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

Regarding the chapters with illustrations, I already posted an announcement on my Ko-Fi page, please take a minute to read it before asking for updates on when the next batch of chapters with illustrations would be posted. Here is my coffee page btw! https://ko-fi.com/arrochi

Chapter 52

I took advantage of summer break—and held a wedding ceremony simultaneously with Ai, Satsuki, and Ayaka.

Of course, it wasn’t legally valid under Japanese domestic law—but in our hearts, we had become proper husband and wife.

“Ahhn♡ Wonderful, darling♡”

And now my title is acting head of the Saionji family.

In about a year, on my eighteenth birthday, I made a promise with the current head to officially become an adopted son-in-law of the Saionji family, and formally became the master of this Saionji estate.

However, since I’m still below marriageable age, legally I’m not yet a member of the Saionji family.

But that’s just for appearances. Within the Saionji family, I’m already treated as Ayaka’s husband.

“I love you, Ayaka…”

“I love you too♡ I also… love you more than anyone in the world♡, darling”

“Me too…”

I—overcame a huge status barrier—and love Ayaka, whom I made my wife, and Ayaka loves me too.

Two people united after a great romance, living under one roof—there’s no way we could stop these feelings…

Pahn♡ Pahn♡ Pahn♡ Pahn♡

“Haaahn♡ Mmm…♡ I’m… so happy…♡”

“Ayaka♡ You’re so cute… Ayaka!”

We came to make love every night—no, whenever we had a chance.

“It feels good… nhaahn♡”

“Ayaka… you’re the best! Ahhh… I can’t take it…!”

The woman in front of me right now, grinding her hips—my wife Ayaka—is truly a peerless beauty.

Lustrous long black hair, a perfect contour drawing beautiful jawline.

Eyes beautiful as jewels, plump and fresh cherry-colored lips.

And a cleanly defined nose bridge—she was a beauty standing at the pinnacle of Japanese elegance.

(No matter how many times I see her, she’s a beauty I never tire of…)

They say you get tired of a beauty in three days, but that’s a lie.

It’s been almost a year since I met Ayaka, and she’s already given birth to my child.

Despite that, I’m still in love with this person just as much, and just looking at each other makes my heart pound.

Just as you never tire of viewing a masterpiece painting—you never tire of the greatest beauty either.

“I love Ayaka so much, I… feel like I’m going crazy”

“Mmm♡ I’ve already— ahh♡ gone crazy…♡”

Pahn! Pahn! Pahn! Pahn!

As our feelings swell, our hip movements get faster and faster.

But it never becomes rough sex—it was a very happy, love-filled, gentle union.

“I wuv you♡ Darling… I wuv youuu~~♡”

“Ayaka…! Ah, Ayaka…!”

Burning up.

Our love grows too large, and the world turns pure white, everything disappearing except the person in front of me.

My body and Ayaka’s body become one, a sensation of something circulating round and round.

(This is… my… power…)

The ability to circulate vital energy with the woman I love and activate the body.

With this, women who sleep with me can obtain sexual pleasure while simultaneously removing all negative aspects of their physical body.

“Darling… I’m… going to come…♡”

“Ahh, it’s okay Ayaka… let’s come… together”

Round and round, the vital energy circulates.

Ayaka’s white skin reflects even the dim room’s light, appearing to sparkle brilliantly.

(My muscles… are surging!)

At the same time, tremendous power flows into my body too, my muscles swelling.

The sensation of my power as a man increasing, transforming into a stronger male.

“I’m coming, Ayaka! You’re mine forever!!”

“Yes♡ Darling!”

Ayaka shaking her hips violently and my cock rubbing up inside her vagina make intense squelching sounds.

(It feels good…! My head and body feel like they’re melting…)

At the end of tremendous pleasure, I instinctively reach out to the large swells before me.

Squeeeze♡

“Ahh♡ My… breasts… haaaahn~~~♡”

“Kuahhh…!”

The moment my head felt like it would boil over, hot semen shot out from my lower half, pouring into my beloved wife.

“Haau… milk… is coming out♡”

“Beautiful… Ayaka…”

While ejaculating, I move my hands squishily, kneading her breasts.

Each time, white milk spurts from Ayaka’s nipples, covering my hands.

“Your hands… I’m sorry… darling…♡”

“Hehe, sorry to Yuichiro, but… it’d be a waste, so…”

Saying that, I decided to suck out the breast milk that should be our child’s meal from her nipples.

“Ahhn♡ You’re drinking it~~…”

“Chuuu… It’s delicious, Ayaka’s milk… gulp”

I continue to simultaneously taste the pleasure of releasing semen and the happiness of drinking my beloved wife’s breast milk.

(I’m happy… I wish this happy time could continue forever…)

“I’m… again… auuuu~~♡”

“Ayaka, you can come anytime… we’re husband and wife after all”

“Auuuu, ahhh~~♡”

We keep climaxing together.

In that pleasure that seemed to last forever, Ayaka’s and my hearts blend together.

(I’m happy too… darling)

Dream or reality—I heard such a voice, and we fell into dreams while still entwined.

※

The next day.

We woke up embracing each other naked… and made love again from morning.

“Darling, we need to get up soon”

“Mmm, you’re right…”

Today, my father-in-law Kazuma-san is coming.

The last time we met was on our wedding day, when he saw Ayaka in her wedding dress and had tears of joy in his eyes—that impression remains strong.

To greet such an important guest, we dressed formally and tidied our appearance, had a light meal, then prepared to head to the entrance to welcome him.

“Master, Mistress—the Grand Master will be arriving shortly”

“Understood. Darling, let’s go”

“Yeah. It’s been a while since we’ve seen father-in-law”

I grasped Ayaka’s outstretched hand, and we started walking side by side.

My wife Ayaka, walking beside me on the soft carpet.

Her figure is so beautiful, like a radiant goddess.

My right arm moved on its own toward such a beauty—and I ended up stroking her round, plump ass.

“Ahhn, oh my, darling…♡”

“Sorry… I couldn’t help it”

I shift my hand up from the ass I instinctively groped, deciding to grab her narrow waist instead.

Then I pull her body close and we walk while pressed together.

(Ahh… I’m so happy. To be able to marry such a woman…)

When I glance to the side, there’s Ayaka’s gently smiling face, and our gazes meet.

“You’re really… wonderful… darling”

“You’re the best woman, Ayaka…”

Despite servants being around us, we walk slowly to the entrance while pressed together in a sweet atmosphere.

And a few minutes later—the person we were waiting for, Kazuma-san, arrived.

“Phew… it’s hot today. Are you two doing well?”

“It’s been a while, Father”

“It’s been too long, Father-in-law. Thank you so much for everything back then”

Kazuma-san was the first person in the Saionji family to recognize me as family, and now we’re in an even closer relationship.

Still, I owe this person a great debt, so I bend my waist 90 degrees and express my thanks with the deepest bow.

“You’re too formal, son-in-law. No, is that disrespectful to the acting head?”

“No, Father-in-law, please don’t… please treat me as your son”

“Is that so? Hehe, then I’ll do just that”

“Yes”

Ayaka laughs cheerfully with a giggle, and Kazuma-san also smiles kindly.

Interacting with such warm people, I reaffirm that I truly love these people and feel very happy just being with them.

“Father, the tea is ready”

“I see. Then, let’s go, son-in-law”

“Yes, Kazuma-san”

The three of us start walking with Ayaka in the center.

In the midst of this, I immediately report recent developments, Ayaka praises my efforts, and Kazuma-san nods happily.

When I become embarrassed and talk about Ayaka’s excellence as a wife, now she blushes instead, and Kazuma-san laughs elegantly.

—His attitude clearly conveys that he’s blessing our happiness.

(Kazuma-san is so cool…)

An adult man.

And his gentlemanly behavior was exactly my ideal.

“Father-in-law, please take the inner seat”

In terms of Saionji family position, I as acting head am the highest ranked, but this is a family gathering.

I ask father-in-law Kazuma-san to sit in the inner seat of honor—and make eye contact with the servants to guide him properly.

“Thank you. Hehe, you really are a well-made son”

Kazuma-san praises me like that. But for me, that’s natural.

Because I didn’t become the Saionji family’s son-in-law to act important.

I’m just doing this because I want to be with the person I love forever.

“Is Yuichiro doing well?”

“Yes, he’s full of energy and the picture of health”

“I hope he’ll grow up healthy without a single illness, like you, darling”

Kazuma-san asks about our son’s condition, and Ayaka and I answer.

(It’s true, they both struggled with illness)

Kazuma-san was born with a weak body, and Ayaka once suffered a serious illness.

The complete opposite of me, who’s never been sick once.

“You really have built a good family. Impressive…”

While we were talking like this, tea and sweets were prepared, and the conversation flourished more and more.

That time was so fun that I got carried away and talked about various things.

Especially when I mentioned we sleep together every night regarding our marital relationship—

“Perhaps a second child will come soon?”

“Ha, haha… that might be true”

“Oh my, darling… hehe♪”

—I ended up confessing that we have sex every night.

“Having strong virility is a good thing, son-in-law”

“Is that so? But, being too strong is also… various things”

Yes, I’ve laid hands on various women.

In fact, all the maids in this mansion—they’ve all been touched by me.

“I have no complaints whatsoever”

“Ayaka…”

My wife understands what kind of man I am.

She understands and still loves me.

“I also understand that son-in-law is vigorous. Including those various parts, you know?”

“Ha, haha… I’m sorry”

My sexual desire is strong. No, too strong.

So much that when I see an attractive woman, I want to embrace her unbearably.

(Especially recently… since I was taught that what was called God Hand is something like a bedroom art—sexual cultivation method)

Miyabi-san taught me. That I can circulate energy through my hands, exchanging vital energy with women.

“You don’t need to apologize. I’m envious of you…”

“Eh?”

“As a man, you’re overwhelmingly superior”

“That’s not…”

True… I wanted to say, but Kazuma-san’s eyes are serious.

For prestigious families with succession issues, does this mean virility is that important?

I interpreted it that way and nodded.

Then the conversation moved to my work as acting head.

“The current head, my father, wants to finish the handover before you officially become a member of the Saionji family”

“Y-Yes”

“Don’t worry. Until then, Miyabi-kun and I will assist you. —And even after you officially marry in, you can rely on us”

“Thank you very much, Father-in-law”

Miyabi-san is of course an amazing person, but Kazuma-san, aside from his physical issues, also has sufficient ability to become head.

With those two here, even I, who still lacks business education, can feel at ease.

“What’s wrong, Ayaka? Why are you smiling so much?”

“Hehe, because having this conversation with Father makes me realize we really got married”

“That’s right, I’m happy too”

Looking at Ayaka with such a happy face, Kazuma-san also seems satisfied.

So I thought.

Today would be a peaceful tea party—and end without incident.

That was shattered when the conversation reached a lull and Kazuma-san brought up a request for me.

“For me?”

“Yes, something only you can do”

“What would that be, Father?”

I have no idea, and Ayaka seems the same.

“Son-in-law… sorry, Ayaka, could you step out for a bit?”

“Y-Yes. Understood, please take your time”

Ayaka seemed curious about the continuation, but as befitting a lady from a prestigious family, she obediently complied, bowing beautifully as she withdrew to the back.

“Ahem. So about the request…”

“Yes”

What kind of request can’t be heard by his daughter? I’m interested, but also scared.

Feeling a bit nervous, I wait for Kazuma-san to open his mouth, and finally he opens his heavy lips.

And the content was—

“Actually… about Carla… —I want you to embrace her”

“Huh?”

—Such a strange sound came out at the absurdity.

(Embrace Carla-san…?)

I didn’t understand.

Because Carla-san is Kazuma-san’s…

“I can no longer… function as a man…”

“A-Ahh… I see, so that’s…”

In other words, he’s dried up… meaning he can’t get erect anymore.

That seems early at 46, but it might be because his body was originally weak.

“So, could you satisfy Carla in my place?”

“That’s… um”

Actually, Carla-san and I do have a physical relationship.

So of course I don’t mind having sex, but there’s an emotional issue here.

To embrace Carla-san knowing she’s the sweetheart of Kazuma-san, my respected father-in-law, someone I know is in a mutual love relationship—that feels wrong.

“I’ve heard about your relationship from Carla too. That’s why I’m asking”

“…!”

It seems Carla-san told Kazuma-san everything.

(Carla-san should be 29. So she’s still young, and naturally sexual desire builds up…)

“Kazuma-san, are you okay with this? With Carla-san and me… doing that?”

“I don’t mind. I’m satisfied as long as our feelings are connected”

“…I see”

(This is bad. I can’t refuse this…)

“Women also explode eventually when desire builds up, right?”

“That’s… true”

“Then it’s better to ask you, who’s experienced. Please, son-in-law…”

I was bowed to by the man I respect most.