The Bully

【Protagonist】
・Name: Momoka Tsukishima
・Height / Measurements: 158cm / B90 – W55 – H81
・Occupation: Junior college student aspiring to become a nursery school teacher
・Personality: Timid, honest, and easily influenced
・Hobbies: Collecting stuffed animals and character merchandise
・Notes: She’s not good at dealing with Saya, who often teases her

【Friend】
・Name: Saya Inukai
・Height / Measurements: 163cm / B70 – W57 – H82
・Occupation: Attends the same junior college as Momoka, majoring in media studies
・Personality: Playful, obsessed with “looking good on camera”, and tends to act without thinking
・Hobbies: Posting on Instagram
・Notes: Secretly adores Momoka. Her way of showing affection is awkward and often misinterpreted

This was the pool’s changing room.
I was alone, quietly changing into my swimsuit.
Somehow… I felt uneasy.
“Oh? Did your boobs get bigger again?”
I flinched at the sudden voice.
Turning around, there was Saya, grinning as usual.
…Bad feeling confirmed.
Saya never seemed to like me. She always found ways to mess with me.
“N-not really…”
I tried to respond as coldly as I could. I didn’t want to engage.
“Hehe, come on, let me touch just a little.”
“N-no…”
Here we go again.
No matter how clearly I refused, she’d always reach out anyway.
She had the same body parts, so why was she so fixated on mine?
“Huh… You’re not reacting much today. Boring.”
Saya pouted exaggeratedly.
“That’s… not true…”
“You’re irritating. Let’s make this more fun.”
With that, she pulled something out of her bag.
“Look at this.”
Proudly, she held out a black rubber anal plug.
“Latest micro-pump tech. Sucks in from here… releases from here.”
She explained it gleefully, like it was a toy she couldn’t wait to use.
And then, her hand reached toward me—
“Now, I’m going to put this in~♡”
“W-what…?”

I stood at the edge of the pool and let out a quiet breath.
The scent of chlorine, the glint of sunlight off the water—
It wasn’t a required class, so it was just Saya and me here.
Everything should have felt normal. And yet… something felt off.
“Momoka~! Hurry uuuup~!”
Saya called out to me, waving her phone in one hand.
I gave a small nod and gently stepped into the water.
…Something felt off.
A sensation I wasn’t used to—something foreign inside me.
One of them was just as I’d expected—it was in my backside.
But there was something else, something she had me take by mouth.
She handed it over with a smile, saying, “It’s just candy.”
But it wasn’t sweet at all, so I simply swallowed it.
I didn’t feel anything unusual from what I swallowed.
But the thing in my backside rubbed with every step, making it impossible to relax.
“It’s your first time, right? Don’t worry, you’ll get used to it~”
Beep!!
“Urp?!”
A burp escaped just as Saya tapped something on her phone.
“Cute ♡ Hey, how does it feel? Doesn’t your stomach feel weird?”
I felt… full.
Was something expanding inside me?
Beep!!
“Ah—!?”
Suddenly, an intense pressure hit me down below—an overwhelming urge.
I clenched with all my strength, desperately holding it in.
Saya burst out laughing.
“What’s with that face? So funny. It’s just the plug expanding a bit, that’s all.”
“Ugh…”
I lowered my head in embarrassment.
Please…
Stop.
Don’t play with my body anymore.
Beep!!
“…?”
This time, nothing happened.
“Hehe~ I just turned on the pump ♡”
“W-what!?”
Gurgle… grrrr…
A quiet sound began rumbling from my stomach.
I felt something cool slowly flowing inside me.
“The pool water tastes good, right? There’s still plenty left—so drink up, okay?”
Saya gently rubbed my stomach as she whispered into my ear.
Stop it.
Why…?
Why can you say something like that and still smile?
I’m not your toy!!
Gurgle… blorp…
“S-stop it!”
“Nope! Keep going—let’s make that tummy nice and big ♡”
My lower belly pushed forward, swollen in an embarrassingly unnatural way.
It wasn’t me…
My body was moving on its own, my stomach expanding without my will.
It hurt.
Saya knew I had a small appetite.
She’d done it before—forcing me to eat, then laughing as I struggled.
But this was on a whole different level.
My belly swelled out, round and tight, from just below my ribs all the way down to my hips.
I had never seen my stomach this big in my entire life.
Saya gently stroked my belly, now stretched tight and full.
“You’re so cute right now, Momoka.”
“…Huh?”
Instinctively, I looked up—
Saya was blushing, smiling softly.
It was the kind of look you’d give a small child, trying to soothe them.
I’d never seen her like that before.
Saya, who was always so bold and brash… showing a face like this?
“Hey… can I take a little peek?”
Saya’s fingers gently slipped the strap of my swimsuit off my shoulder.
Before I could resist, one of my breasts was exposed to the cool air above the pool.

“M-Mm… Saya… ah…”
“Hehe… see? Feels nice, doesn’t it?”
Slowly, Saya’s hand touched my chest.
Not too hard, not too soft—just the perfect amount of pressure.
“Hey, Momoka… what do you really think of me?”
Her breath brushed against my ear.
I could hear her heartbeat, mixed with the sound of water.
Even in the cold pool, her warm body wrapped around mine.
Her heartbeat quickened—and so did mine. My head started to spin.
Why?
She’s always been so mean to me…
But now, Saya looked at me so gently.
Like she was looking at a baby—tender, soft, and caring.
Why does my chest hurt like this?
Grrrrr!!! Gyurururururuu!!!
“Ah—!?”
My stomach clenched tight, like it was being squeezed from the inside.
“S-Saya, stop…! M-my stomach… it’s already—ugh!!”
I looked down—
From between my breasts, my stomach was bulging outward, unbelievably large.
“Aww, and just when it was getting good.”
Saya gave my swollen stomach a gentle rub, then pulled out her phone.
She opened the app and, almost reluctantly, tapped the stop button.
“…Huh?”
Her brow twitched.
“Did it bug out?”
The screen had gone completely white.
The app had frozen.
“Okay, okay… let’s try a reboot.”
“H-hurry…”
But instead of panicking, Saya looked… amused.
It seemed like she was enjoying watching me suffer through this unexpected glitch.
“Uhh… hey, it’s not responding…”
Gyururururrrk!!
A loud noise erupted from my stomach.
The pressure inside was building.
The pump—was it still running!?
“S-Saya, please… this isn’t funny anymore… I-I really can’t—”
Sharp pain stabbed through my abdomen.
This wasn’t a normal stomachache.
I couldn’t breathe.
My lungs were being pushed upward, and my breaths were growing shallow.
“Wait, this might actually be bad…”
Even Saya looked panicked, her eyes darting nervously.
“J-just stay there, okay!? I’ll fix it—I swear!”
With those words, she climbed out of the water and took off running, barefoot.
“S-Saya!?”
Gugyurururkk!! Gurglegurglegurgle!!!
“Ugh—ahhh!?”
I had to get out of the pool—fast.
M-my stomach…!
Desperately, I pushed toward the ladder, lifting myself from the water one step at a time.
“Ugh… it’s so heavy…”
The moment my upper body left the water, a crushing weight settled in my lower belly.
What had felt light underwater now dragged like lead.
My lower abdomen throbbed dully as it strained to hold the weight.
How many liters of water were inside me…?
Somehow, I managed to crawl up onto the poolside.
Blorp!! Blorp-blorp!!
“Haah!?”
A bubbling sound echoed from deep inside my stomach.
Was that… air inside me!?
Panicking, I removed my swimsuit to check what was going on with my belly.

Blorp!!
“Ugh!?”
The moment my swimsuit shifted, my belly suddenly bulged forward, stretching the skin along with it.
A powerful feeling of fullness surged through me.
“Urgh!?”
I felt like I was going to throw up.
Is the water and air that went in… coming back out!?
“Guh—!?”
N-no… I didn’t want to throw up!
The thought of that stuff coming back out through my mouth—it was unbearable.
I forced it back down as it surged up my throat.
“Haa… haa… haa…”
N-no good…
No matter how much I swallowed, it kept rising—
My stomach felt like it was going to burst open.
No… I don’t want this…
“Guh… urp… huh…?”
Nothing came out.
Even though my belly felt at its absolute limit, only a few strands of drool escaped my lips.
W-wait…
Don’t tell me…
Even this is being controlled by the app…?
Blorp!! Blorp-blorp!!
“Uuaaagh!!”
The moment I realized I couldn’t release it—
The pressure in my stomach became worse than ever before.

“Nghh… no… please, get out… I’m begging you…!”
Desperately, I inserted my fingers to pull out the anal plug.
My fingertips brushed against something slick and foreign.
How was I supposed to pull this out?
It kept slipping—I couldn’t get a grip.
And pushing it out from the inside…
If I strained my stomach any more, I really might—!!
Rrrrip…
“It huuurts!! It huuuuurts!!”
A sickening tearing sound.
Drops of blood trickled from my stomach.
Oddly… there was no pain.
I remembered something I once heard in class—
When death draws near, the brain shuts off pain.
No… w-wait… no, no—please, not like this!!
Clutching my belly with both arms, feeling like it might tear open, I dragged myself forward in desperation.
The phone I left in the changing room—
That was my only chance to call for help.
Squelch… crackkk…!!
“Aaagh—!! AaaaAAAAHH!!”
A horrible tearing sound came from deep within my abdomen.
Something hot and wet began to spread across my lower stomach.
No… I couldn’t move.
Even digging my nails into the floor, I couldn’t crawl an inch forward.
M-my stomach… it’s going to…
My body is going to split apart—!!

Splat!!
“Ugh!! Ssshhhhh…!”

A wet, bursting sound.
The pressure in my stomach vanished all at once, and air rushed back into my lungs.
My body was soaked in a lukewarm, slippery fluid.
Don’t think about it.
Don’t look at my stomach.
Absolutely not.

I have to… I have to call for help… fast…
“Guhp.”
Wait… is that… a nosebleed?
It’s pooling on the floor.
But… that’s a lot. More than it should be.
“Haa… h-hyuu… hyuu… hyuu…”
The pain’s fading.
Even my stomach—
The one that hurt so badly—it doesn’t hurt anymore.
I can’t feel anything.
Is it… my brain… shutting off the pain…?
“Momoka!! I brought the equipment—h-huh? Momoka…? MOMOKA!!”
It’s okay now…
I’m sorry, Saya…
Just let me sleep… a little…

Huh… where… am I?
This definitely isn’t the pool.
“Ugh…”
A searing pain tore through my stomach.
Looks like… my brain wasn’t blocking it anymore.
I have to… get help…
While I’m still conscious…
I—I can’t move.
What… what is this?
There were tubes stuck all over my body.
The sound of machines hummed constantly in the background.
Th-this place… is this… a hospital?
“Momoka!? MOMOKAAA!!”
Saya threw herself at me, crying uncontrollably.
“Momoka… I’m sorry… I’m so sorry…”
Her voice was shaking—
But her arms, wrapped tightly around me, held me stronger than they ever had before.