“So… Kai.”
“Yeah?”
“Who’s the girlfriend candidate? Matsuri-chan, Saika-chan, or Emu-chan?”
“—!?”
G-Girlfriend candidate?! What kind of question was that?!
As I floundered, my sister kept a dead-serious face.
“I mean, it’s obvious those three trust you. From what I heard, the way they look at you… You’re that important to them.”
“…………”
“So my question’s normal, right? They’re all sweet, gorgeous, and—unlike scertain someone—have huge chest, damn it!”
“That last part’s just jealou—”
Glare!
Like a frog stared down by a snake, I shut my mouth.
After a moment, though, my sister cracked a grin.
“Well, whatever happens, I’ll watch over you as your sister. Personally, I’d love for you to stay close with all three.”
With that, she took my hand.
“Sorry for the wait, everyone!”
“No problem, Onee-san. Fufu~ You two really are close, huh?”
“Kai-senpai looks like a little kid next to you.”
They smiled at our linked hands, but I had to set the record straight.
“She’s the one who looks tiny here.”
“Excuse me?”
Sometimes, a man must stand against great evil… for some reason, I always get competitive around my sister.
That’s just how siblings are!
She clearly wanted to retort, but with Matsuri and the others present, she held back—a rare victory for me.
(Though I’ll definitely pay for it later…)
“You okay…?”
Saika’s worried voice made me flash a thumbs-up.
“All good. I’ll probably get murdered when we get home, but I’ll fight back. Losing’s just the usual anyway.”
“Is that… really ‘all good’…?”
“It’s fine. If I say it’s fine, it’s fine.”
I forced Saika to accept that.
Next, we headed to a multi-person waterslide—something everyone could enjoy.
“Everyone ready?”
“Yes!”
“I’m okay…!”
“I-I’m a little scared, though…”
We piled into a round float that fit five, waiting for the drop.
Holding the float’s handrails, the attendant nodded—we were set.
“…?”
Just then, my eyes met Matsuri’s across the float.
Maybe because of earlier, I couldn’t look away.
“…Ehehe.”
“—!?”
Our gazes locked, and Matsuri grinned, swaying slightly—
As if deliberately showing off the moment when those exquisite, bountiful curves swayed right before her own body. I visibly panicked, but luckily, no one noticed…
because the float lurched forward.
“Whoa—!”
Distracted by Matsuri’s bouncy chest, I loosened my grip, nearly losing balance.
“Eek!?”
“K-Kai-kun…!?”
Trying to steady myself, I ended up clinging to Saika beside me.
(S-Soft…!?)
My right hand full-on groped her chest with all my might—
way harder than when I’d touched Matsuri’s. Hard enough to leave marks.
“Nn…”
“S-Sorry—!”
I yanked my hands back… only to tilt the other way toward Emu.
Again, it’s hard to withstand the shaking, and my body leans toward Emu, who is sitting right next to me, and my hands turn toward her as I look for something to hold on to.
“S-Senpai…?”
Now I was clinging to her instead.
While chaos unfolded around me, the float kept raging forward.
“Woo-hoo! How’s that, Matsuri-chuwan!?”
“Amazing, Miyako-shan!”
Unlike my accident-prone self, Matsuri and my sister were purely enjoying the ride.
(Since when did they start nicknaming each other!?)
But then—a sharp turn hit. The violent swaying made me grip Emu tighter, my nails digging into her skin slightly.
“Nghah~♪”
“S-Sorr—!”
I pulled back, finally grabbing the handrail properly.
(O-Oh…!)
But now, with my body completely immobilized, I am in a new kind of enjoyment.
Letting the waves take me? Thrilling near-falls?
Secondary!
Because—
(H-Holy hell, the jiggle!?)
I’m not the only one enduring the violent shaking.
The wild rocking wasn’t just testing me—Matsuri, Saika, Emu, and even my sister were bouncing hard. Which meant… (B-Boobs everywhere!?)
It’s no exaggeration to say that the sight of them swaying and jiggling in front of me, Front, left, right—jiggly heaven! A sight only possible on this ride!
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“Eeeek! Scary, Matsuri-chan!”
Faking terror, my sister clung to Matsuri, burying her face in Matsuri’s chest. Matsuri just laughed awkwardly, hugging my petite sister.
“…So cute, Onee-san.”
Then—another impact.
“Kai-kun.”
“Kai-senpai.”
Saika and Emu both latched onto me.
Had they lost balance too? But the worst was over—just gentle curves until the end. With a final splash, we reached the goal, icy water raining down.
“Thanks, Kai-kun.”
“I’m glad you were next to me, Senpai~♪”
They pulled away, leaving me dazed.
First Matsuri, now Saika and Emu… If this luck kept up without my partner’s power, I might be due for some real misfortune.
“Kai? What’s up?”
“Ah… I was in heaven.”
“Too much shaking messed you up?”
“Wow, sis, you get me.”
“…Huh?”
She gave me a look, but technically, she wasn’t wrong.
After getting off, we headed to the next attraction—
It’s the Rough Wave Pool, which I had originally wanted to experience personally, literally entering a pool where strong waves are generated, and although I had enjoyed the waterslide earlier, I still wanted to experience this as well.
“…!”
“It’s okay, Saika. Hold my hand, alright?”
“O-Okay!”
Saika hesitated, but Matsuri reassured her.
“Woooooh!!”
“I’m getting swept awaaay!?”
“D-Don’t let go!”
“No choice—just go with it!”
The pool’s fierce waves sent playful screams flying.
Of course, the staff is watching over the pool to prevent accidents from happening, and I guess this is what contributes to the reputation and safety of this facility.
“The current’s faster than I expected, huh?”
“Yeah… wait—”
“What’s wrong?”
I turned my gaze to Emu standing beside me and noticed—no, more like remembered.
Earlier, when I’d clung to her in surprise, my nails had dug into her skin. There was no blood, but a bright red mark was clearly visible.
“Sorry, Emu… Does it hurt?”
“Huh? Oh, this?”
The mark was near her shoulder.
Even if it wasn’t bleeding, it probably stung… Yet, contrary to my concern, Emu smiled and lightly traced the mark with her fingertip.
“Not at all! If anything… giggle♪”
“Uh… Emu?”
“Don’t worry about it! It’s fine♪”
“…Okay.”
Emu began tenderly stroking the reddened mark, while I averted my eyes from her—now fully transformed into “M-chan”—and stepped into the aggressively churning wave pool.
“Whoa!?”
The moment I entered, a current strong enough to knock me off my feet hit me.
It wasn’t dangerous, but even if I somehow managed to brace myself, people behind me would probably crash into me anyway.
“K-Kai!”
“Onee-chan!?”
No sooner had I heard her voice than she latched onto my back.
She wrapped her legs around my waist like she’d never let go, pressing herself against me as tightly as possible.
“The current’s way stronger than I thought—scared me for a second!”
“W-Well, that’s how it is.”
Emu had followed us in shortly after, skillfully maneuvering through the water to end up right beside me.
“You okay?”
“I’m fine. As for Matsuri-senpai and Saika-senpai… Oh, there they are.”
Matsuri and Saika were much farther ahead.
Even from a distance, I could tell Matsuri was holding Saika’s hand tightly, making sure she didn’t get swept away in the current.
“Excuse me, sir!”
Just then, a staff member standing by the poolside called out to me.
He was walking alongside us, his eyes fixed on our group, so he definitely meant me.
“What is it?”
“Is that your little sister? Is she alright?”
Seemed like he was worried about Onee-chan clinging to me.
But the moment he called her my little sister, the arms wrapped around me tightened threateningly… Not that she did anything else, but I was too scared to look at her face.
“…Giggle, so that’s the kind of relationship Kai-senpai and his ‘sister’ have.”
“H-Hey, Emu! Don’t smile like this is heartwarming!”
“Ahh… Yeah, we’re like this. It’s fine, really.”
“Oh? Is that so…?”
“By the way, she is my big sister.”
“Ah! My apologies!”
For Onee-chan, that hasty apology must’ve been humiliating.
She smacked my head as if urging me to move faster, then walked ahead hand-in-hand with Emu until we caught up with Matsuri and the others.
“Ah, Kai-kun… Wait, your sister’s adorable!”
“…Are you clinging to Kai-kun?”
“Cl—Ugh, whatever! Fine, sure!”
Onee-chan gave up, buried her face in my head, and started gnawing on me—seriously, stop it!
“Grrrrrl!”
“…Onee-chan’s personality’s way different today just ’cause Matsuri and the others are here.”
If it were just me, she’d never act like this out of embarrassment.
She obviously likes Matsuri and the others, but she probably also wants to seem like a reliable older figure in front of them.
(Well… Not like this side of her is bad, either.)
Smiling wryly, I spent the next while enjoying the waves.
Later, after we’d had our fill, we left the pool and killed time in a general rest area. Onee-chan, having played too hard, dozed off with peaceful breaths.
“Jeez… This girl.”
“Ahaha… But she really is cute♪”
Matsuri, who was giving her a lap pillow, said that.
Looking at them like this, it almost seemed like Matsuri was the older sister and Onee-chan the younger sister… But either way, Onee-chan in a swimsuit was peak perfection.
“Nnn… Mmmn…”
“S-So cute…!”
“Her sleep-talking’s way too adorable…!”
Unlike me, who was just exasperated, Saika and Emu were utterly smitten.
Not that Onee-chan would hate being seen as cute like this, but it’s probably not how she wants to be perceived… Still, if everyone’s happy, can it really be bad?
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