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 44

I was at a bustling city café, idly scrolling on my phone to kill time. My finger flicked across the screen, but the words didn’t register.

(Sigh… How do I say this…?)

My mind was elsewhere—on a daunting task. I had to tell the person I was meeting, “I can’t marry you, but I don’t want to break up,” and somehow convince them to accept it.

“Darling♪”

The voice belonged to a girl in sunglasses, masking her face from recognition. Yet her radiant beauty shone through, an aura no disguise could dim.

“Satsuki-chan.”

She was the one I’d been waiting for—my girlfriend, Satsuki-chan.

“Did I keep you waiting?”

“Nah, it’s all good. Nice we both got a day off, huh? How’s modeling going?”

“Yup. But I’m a bit worried about my belly lately.”

Satsuki-chan glanced at her slightly rounded stomach, nestled in a light blue camisole.

“You’re stunning today, Satsuki-chan. You just keep getting more beautiful.”

“Thanks♪”

She’s my girlfriend but also a celebrity, known nationwide. Her youthful charm and lively, candid talk make her a hit with young fans, with constant invites for web shows and TV.

“Saw your last show—the fashion segment,” I said.

“Oh, that? Just introducing trendy stuff, super easy.”

She makes it engaging, bluntly praising or critiquing, livening up the studio.

“But if work gets weird, call me right away. I’ll come rescue you.”

“Hehe, my manager’s got me covered. Plus, I’m all yours, so don’t worry♪”

“…Yeah.”

She’s devoted to me, yet I can’t love only her.

(Sorry, Satsuki-chan. I can’t let go of the other girls…)

Ayaka-san’s baby is due soon, and I’ve fathered children with many others. Satsuki-chan’s carrying my child too.

These kids are proof of our love, and I’m determined to make them all happy. But how will the girls see it?

My thoughts were cut off by Satsuki-chan’s eager expression.

“Let’s get to the date!”

“Yup.”

Our date was typical—lunch, browsing apparel shops, eating trendy sweets, like any student couple.

“Wow~ So cute~♪”

“Really. This place lives up to its hype.”

Satsuki-chan snapped pics of a colorful fruit-topped cake, posting to SNS.

(That’s part of her star power…)

I never bother photographing food—too much hassle. But for a celebrity like her, constant content is key.

“Thanks for waiting, Darling♪ Let’s eat!”

“Yup. Wow, tasty!”

“So good~! Not just pretty, the flavor’s top-notch!”

Restricted from sweets for her job, she savored the rare treat.

“Want mine?”

I offered my untouched cake, wanting to see her happy face.

“Ugh… I’ll pass. More, and I’ll gain weight.”

“You’re so disciplined, Satsuki-chan.”

“Am I? Ehehe♪”

Self-control takes serious motivation. I manage my diet for fitness, but for a sweet-loving girl, it’s tougher.

“What next? Movie?”

“Hmm, I’ve got a place in mind… Cool?”

“Of course.”

Anywhere she wants is fine by me. We left the sweets shop, walking side by side.

(She’s so cute… Just walking, she sparkles.)

Her oval face, perfect features, glossy blonde hair catching the sun, ample oppai, and killer figure—she’s the ideal girlfriend. And her slightly swollen belly, carrying our child.

Lost in her beauty, we arrived at a familiar spot.

“Here’s…”

“Yup, where we first met outside.”

“Yeah… Nostalgic.”

Last summer, after running out of condoms from fooling around with my sister, I came to this convenience store. I met Satsuki-chan, and somehow, we ended up having sex.

“Come on♪”

Like then, she led me to a secluded park.

(Oh, this brings back that thrill…)

Back then, I couldn’t imagine being with anyone but my sister. The sweet, nostalgic memory quickened my pulse.

“Look—remember this spot?”

“Where we first had sex…”

“Yup, bingo♪”

Our first time was here, sneaking around. She was a middle schooler then, her face a bit younger.

“N, chu♡ I love you, Darling…”

“I love you too, Satsuki-chan…”

A sudden kiss. Her dreamy face pressed close, lips clinging wetly, our chupachupa sounds fading into the empty park.

“Have I become a better woman since then?” she asked.

“You’ve grown so gorgeous, Satsuki-chan. Not just looks—your heart too.”

“Really?”

Back then, she was an ordinary cute middle schooler. Now, she’s a famous model, a household name, with far more worldly experience than a student like me.

“You’re the perfect girlfriend. I’m so lucky to be with you.”

“For real?”

No lie—how could I not love someone so cute, kind, and sexy?

“You’re getting cuter every year.”

“Haha♪ But you’ve changed more, Darling…”

True. I care about my appearance now, work to improve myself, study elite manners, and have a mentor I admire.

“Walking in town, all the girls turned to look at you.”

“Did they? All the guys were staring at you.”

“Haha, then we’re a perfect couple, huh?”

“Yup, the best.”

No more self-deprecation. To be with this amazing girl, I’ll be an amazing guy.

“But you won’t marry me…”

“——”

The marriage question I’d wrestled with endlessly. It’s time to answer.

“I can’t abandon Ayaka-san. She needs me.”

“…”

“But—”

I was about to say the most selfish thing.

“I want you too, Satsuki-chan. I’ll never let another guy have you.”

“Haha… That’s awfully convenient, huh?”

“Yup. But it’s how I feel.”

She stared into my eyes.

I met her gaze, unflinching.

“Haha… You’re so selfish, Darling… So I’m second place?”

“No. You’re number one. Ayaka-san’s number one, and you’re number one.”

“That’s cheating…”

“But I mean it.”

There’s no ranking. I just want to be with the girls I love—there just happen to be more than one.

“I’ll make you and our baby absolutely happy, loving you forever.”

“Having multiple wives and making them all happy… Can you do that?”

“I can. I’ll make it happen!”

“Got it. You’re hopeless, Darling…”

Tears crumpled her cute face, but she forced a smile, clinging to my chest.

“Satsuki-chan…”

“Ugh… I wanted to be a bride… Sniff…”

“…”

“In a beautiful dress, celebrated by everyone…”

For her, any other guy could grant that wish.

“But I can’t forget you… I can’t imagine leaving you…”

“Satsuki-chan…!”

I hugged her trembling body, vowing never to let go.

“I can’t marry you, but I’ll make you happier than anyone.”

“Alright… Make me happy, Darling♡ I love you.”

“I love you too, Satsuki-chan…”

Her gaze burned with new intensity, so adorable my desires flared.

“Hey… Wanna do it? Sex…♡”

“Wha!? No one’s around, but you’re famous now!”

“Doesn’t matter.”

She turned, presenting her round, perfect rear.

“Didn’t you say you’d make me happy…?”

Lowering her shorts, she exposed her private parts.

“Gorgeous… Even your pussy’s the most beautiful, Satsuki-chan…”

“Geez, Darling…♡”

Spreading her pink hole, she was, in that moment, the world’s most stunning woman—my greatest love.

(If I get caught for this, it’s a man’s honor…)

“Satsuki-chan…! I’m not holding back!!”

“An♪”

I lost all hesitation for daytime park sex.

…

Careless of onlookers, I shed my pants, my rock-hard cock vertical with excitement, and plunged it into her slick pussy.

“Aaa… Going in…♡”

“Satsuki-chan!! Amazing… Feels so good…!”

Zu—— Nyuuuu♡

“Haa♡ Your cock’s bigger than usual…♡”

“That’s… ‘cause you’re so cute…!!”

I pushed in, my tip quickly reaching her depths.

(Incredible… So tight… She’s just as excited…)

With a baby inside, rough sex was off-limits. So, my plan was clear.

“I’ll make you feel good, Satsuki-chan… Here…!”

“N… Aan! My butt… Don’t knead it…”

“So smooth, soft… Like this, right?”

Maxing my hand’s power, I massaged nerves from her rear to her pussy.

Gunii! Gugyuu♡ Momi♡ Momi♡

“Yada…♡ My naughty voice’s coming out…♡”

“It’s fine… Let me hear lots of it…”

“It’s… outside…!”

“Doesn’t matter.”

If seen, I’d show off. I love her, and she loves me—nothing to be ashamed of.

Munyuu♡ Gyu♡ Gyuu♡♡

“Aa…♡ My butt’s tingling…♡”

“Here, here! Just your butt?”

“Nnnu~~~♡ No… Haa♡ Haa♡ My pussy’s tingling too…♡”

As she said, her vagina pulsed, gripping my cock deliciously.

(She’s so naughty… But I love that naughty girl…!)

Suppressing the urge to pound, I circled my hips, stimulating her slowly.

“Your moves are so naughty, Darling…♡”

“You’re naughty too, Satsuki-chan.”

“Geez… Aan!!♡”

Guringurin♡

My lewd hip circles and swelling glans made her moan loudly. My hands and fingers hit her outer erogenous zones, my cock her inner ones, doubling the assault.

“Just having your cock inside…♡ Why’s it so good…♡”

“Because we love each other, Satsuki-chan.”

A half-lie. Our love’s real, but I didn’t mention my hand’s enhanced power.

(I’m a cheat. But if it keeps her loving me, that’s fine.)

Cowardly or not, I’d defy ethics or laws to love her. I’m crazy for her, so we’ll love fully—that’s my ego.

“Aa… Feels good… I’m cumming just from your cock…♡”

“Go for it! Cum without holding back!”

Gu—— Gyuuuu~~~♡

My hands sent electric pleasure through her body, from rear to pussy, up her spine, to her oppai.

“Aa… Aaaa~~~♡ Cumming… C-Cumming~~~♡♡”

She came, her naughty scream echoing in the bright park—a famous, peak-popularity beauty.

Her sight drove me—