How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 37.2

Chapter 37.2

The first video we sold brought in a decent chunk of cash for Yukino, Riria, and me. With that money, we splurged on proper filming gear, churning out more sex videos. Each one got better, the quality climbing until now we’re producing some seriously high-end stuff.

“Aan♡ So good… Your big cock’s pounding me~~~♡” Riria moans.

“Ugh… Ah…” I grit my teeth.

(Riria’s pussy is unreal…)

Even back when we were doing it daily at school, she was amazing. But since we started filming, she’s hit a whole new level.

Pachun♡ Pachun♡ Pachun♡ Pachun♡

“Nn♡ Nn♡ Nn♡ Nnu~~~♡ Feels so good~~~!” she cries.

“…!?” I stifle a groan.

Her sweet moans, the fresh scent of her sweat, and that top-tier pussy clamping kyunkyun♡ around my cock—it’s perfection.

I tell myself it’s for the shoot, but somewhere along the line, I started craving sex with Riria.

Then one day—

To celebrate hitting fifty thousand yen in sales, we decided to go on dates with Yukino and Riria. With Yukino, it was a classic setup: a movie, some shopping, and hotel sex. The next weekend, it was Riria’s turn.

“Hey… you sure you wanna date someone like me?” she asks, her voice small.

“What’re you talking about? What’s wrong with going out with you?” I counter.

“It’s just…”

It’s rare for Riria to sound so self-conscious, and it worries me.

“You’re with all these devoted, cute girls already…”

“Well, yeah, I hang out with cute girls,” I admit.

Mostly for sex, though—not exactly dating.

“I just wonder if it’s okay to take up your time with someone like me…”

“Someone like you? You’re crazy cute, Riria.”

She really has blossomed. She’s ditched her wild partying days, makes me bentos every day, and puts in so much effort for me. And her looks…

※

“This place is free, really?” Riria asks, wide-eyed.

“Yup, a friend’s company hooked us up,” I say.

Riria wanted a pool date, so I asked Miyabi-san for a nice spot.

“I’ll reserve the Saionji family’s outdoor pool,” she’d said.

I thought it was too extravagant for a student date, but—

“Atmosphere is everything in a date. Surely you weren’t planning to take her to a public pool,” she’d added, leaving me speechless. So, I went with it.

“Come on, let’s swim♪” Riria calls.

“Y-Yeah,” I stammer.

I’d been staring, captivated by her growing allure, when she suddenly hugs me. The soft munyumunyu of her body against mine nearly sets my groin off, but I fight it down.

“Getting hard? Nfufu♡” she teases.

“Hey, you did that on purpose…” I grumble.

She’s messing with me, but that cheekiness is so cute, I can’t stay mad—such is a guy’s weakness.

Musing on that, I dive into the pool with Riria, playing to our hearts’ content for the first time in ages.

※

On the way back, after all that physical closeness, a warm vibe settles between us. We walk side by side under the sunset glow.

I’m set on inviting her to a hotel later, but first, I figure we’ll hit a casual diner for food. Just then—

“You’re Riria, right?” a stranger calls out.

“Huh?” she freezes.

“It’s me. We used to date, remember?”

The guy looks a bit older, maybe—bleached hair, piercings, a sleazy vibe. He clearly knows Riria, but her response is cold.

“Don’t know you. Wrong person,” she snaps, pressing closer to my arm, signaling to move on.

But—

“Wait! You’re Riria, don’t ignore me!” he shouts, his attitude flipping to anger.

“Kyaa!?” Riria yelps.

He grabs her shoulder—the one not against me—yanking her roughly to face him. That kind of aggression is too much, even for me.

“Hey, can you stop?” I step in.

“Huh?” he sneers, glaring up at me.

He’s shorter but smirks like he’s itching for a fight, exuding confidence.

“Big kid thinks he’s tough? Don’t mess with me,” he spits.

“Leave my girlfriend alone,” I say firmly.

Guys like this pounce on weakness, so I stand my ground.

“You little—talking down to your elder!?” he snarls, reaching for my hair, probably to intimidate me.

But—

“Ow, ow, ow! Let go!” he yelps.

I seize his wrist, squeezing lightly with my trained grip.

“Stop touching my girlfriend, and I’ll let you go.”

“You…!” he growls.

Still defiant, he swings his other fist at me.

“Hmph!” I dodge.

“Guh!?” he gasps.

No choice—I shift my weight, twisting his joint and pulling him to the ground.

“Ow! It hurts!” he whines.

Pinning his wrist and flipping him prone, I’ve got him subdued. It’s basic aikido, but against an amateur, it’s more than enough.

The Saionji family’s self-defense training has my body moving on instinct.

(Not as perfect as Miyabi-san, though…)

“No more violence. Keep harassing us, and I’ll call the police,” I warn.

“Fine, I get it!” he relents.

Trusting his surrender, I release him. Rubbing his wrist, he mutters to himself, then suddenly shouts at me.

“You’re her boyfriend, right? You know about her?”

“Know what?” I ask.

“Hey, stop—” Riria tries to cut in.

But he’s faster, leering with a slimy grin.

“She was a hooker, man.”

“Shut up!” Riria snaps.

“So what?” I shrug.

What’s his point? I don’t get it.

“I’m saying she was a whore! A slut, get it?” he presses.

“I know. That’s old news. Doesn’t bother me,” I say coolly.

If a girl’s cute and loves me, I don’t care if she’s a “slut.” I know plenty of sex workers, too. Honestly, girls who love sex are even cuter.

“You’re okay with a skank who’s been fucked by tons of guys!?” he barks.

“She’s not dirty. I love Riria—she’s the best,” I retort.

Cute’s all that matters. Her past? Doesn’t faze me. I’ll make her so crazy for me, she’ll never look at another guy.

“So, back off,” I finish.

“—Tch, damn it…” he mutters.

Seeing I’m unfazed, he spits a curse and slinks away.

(He only talked to her ‘cause she’s cute… What a loser.)

Turning back, I flash Riria a grin.

“He’s gone. Rough luck, huh?”

“Y-Yeah…” she murmurs.

Scared, maybe, she clutches her chest, face flushed. To comfort her, I gently pat her head.

“If another creep shows up, I’ll protect you.”

“Y-Yeah… Yeah,” she nods, her head bobbing.

Satisfied she’s okay, I suggest grabbing food, but—

“Forget that… Let’s hit a hotel,” she blurts.

“Not hungry?”

“More than food… I’m dying to have sex with you right now.”

Her face burns red as she confesses.

(She’s so cute… I love girls like her.)

“Alright, let’s go at it till morning,” I grin.

“Yup♪” she beams.

Skipping dinner, we head straight to the hotel.

※

At the hotel, we barely shower before clinging to each other, naked.

“Gods… You’re amazing,” Riria breathes.

“What’s with you all of a sudden?” I laugh.

“I’m… falling for you.”

Her misty eyes lock onto mine, sparkling with a maiden’s glow, so unlike her usual self.

“You’re adorable, Riria,” I murmur.

“Nn, don’t flatter me…” she pouts.

“It’s not flattery.”

I press my forehead to hers, gazing deep into her eyes.

(She can make that face too…)

As I study her, her breathing quickens, hot puffs grazing my face.

“I can’t wait anymore…♡ Let’s do it, quick…” she pleads.

“Yeah… I wanna fuck you, Riria.”

“An♡” she gasps.

Scooping her up, I lay her on the bed, sliding my rock-hard cock into her dripping pussy.

“Nnn~~~♡” she moans.

Zunyu~~~♡ My cock sinks into her molten hole. Her pussy’s a masterpiece—not too tight, not too soft, just perfect.

“So good…♡ I’m feeling it more than ever…♡” she whimpers.

No need for my ability—I can tell she’s in heat. Her pussy begs to be ravaged, craving my cock.

“You’re beautiful, Riria,” I whisper.

“Nn…!” she shivers.

Her pussy clamps kyun♡.

“I love you,” I say.

“Auu…!!” she gasps.

Tighter this time, stronger.

“I’m gonna wreck you.”

“Haaa♡ Nn♡ Nn♡ Nn♡ Aan♡” she cries.

Pachun!! — Pachun♡ Pachun♡ Pachun♡

I angle my cock to hit her portio, slamming it in repeatedly. Her body’s an open book to me—I know every inch.

“Aoo♡ There, yes! …It’s tingling…♡” she wails.

Papanpapan, I pound her vagina with crisp rhythm, using my ability to flood her entire body with pleasure.

“Oguuu~~~♡ What’s this…♡” she moans.

“Feels good, right?” I grin.

No holding back—I’m set on making her mine. Not because of that guy’s nonsense. I just want this irresistible girl bound to me forever.

“Ooo~~~♡ I’m… cumming…” she pants.

“Here!” I thrust.

I roll her nipple kurikuri♡ for good measure.

“Niii~~~♡ Oh…♡” she screams.

She cums, her face a wild mix of ecstasy.

“No… Embarrassing…” she mumbles.

“Your cumming face is gorgeous, Riria,” I assure.

A girl’s pleasure is the world’s most beautiful sight. Riria lights up at the praise, trembling with joy each time I whisper it.

(She wants to be loved right now…)

Not just lust—she craves love-filled sex.

Pachun♡ Pachun♡ Pachun♡ Pachun♡ Pachun♡

So, I take my time, melting her mind and body, turning her whole being into an erogenous zone. Slowly, we sink into a swamp of pleasure together.

“Sex like this exists…♡ An♡” she marvels.

“Loving each other’s the best, right?” I say.

“Yup♡” she agrees.

Her heightened senses tint her skin a faint pink, exuding feminine allure.

Bathing in it, I can’t hold back—

“Riria, I’m gonna cum,” I warn.

“Nnu♡ Go ahead, fill me up♡” she urges.

“Alright,” I nod.

Unlike filming, I use gentle thrusts to satisfy her, rocking her pussy tenderly.

“My womb… It’s tingling~~~♡” she cries.

“Here I go!” I announce.

“Aa…♡” she sighs.

My impatient semen bursts from my cock, filling her vagina in one go, then keeps spurting dobyudobyu♡ inside.

“It’s coming…♡ Aa, I’m cumming~~~♡” she moans.

She trembles, climaxing in sync with my release, her body welcoming me.

“You’re the best, Riria,” I say.

“Aa… I get it now…” she murmurs.

“Get what?” I ask.

We whisper, savoring the pulsing pleasure.

“Sasahara Satsuki’s feelings…”

(Satsuki-chan’s…?)

“When a guy you love this much cums in you… you want his baby.”

“Huh?” I blink.

“I always felt inferior to the other girls…”

“Yeah…” I nod.

I’d sensed that.

“I’m a slut, rough around the edges… I’ve done dirty things.”

“That’s—”

“So, from now on—I wanna live for you!”

She reaches up, wrapping her arms around me.

“I’m behind the others, but I wanna dedicate my life to you.”

“Riria…”

“Is that okay…?”

No way it’s not.

“I’m thrilled. Having a girl this cute feel so strongly for me…”

“…♡” she blushes.

“A few years of your past don’t matter. We’ve got decades ahead together.”

“Yup♡ Nn, chuu…♡” she agrees.

We pledge our love, kissing, swapping saliva. In that moment, we transcend lovers.

Though—

“Use protection, okay? We’re students,” I remind.

“Tch~~~” she pouts.

“Geez, you… Haha,” I laugh.

She was probably planning to get pregnant.

“But once we graduate, I’ll pop out babies every year, so brace yourself♡”

“Got it,” I grin.

I didn’t realize then that she’d keep that promise to the letter years later.