Rotor Endurance at Retaker's Academy
Another weekend slipped by, and Monday morning dawned once more.
The lecture hall at Retaker's Academy was thick with the usual Monday slump, a heavy atmosphere of exhaustion hanging in the air. Sighs seemed to echo from every corner, but the only sound cutting through it all was the math instructor's voice filling the room.
"Alright, to find the differential coefficient in this equation, we need to transform it first, right? You all know how to do that?"
"Yes~."
"...Yes. Hnngh?!"
"Your responses don't inspire much confidence. Let's go through it step by step, then. First, multiply the numerator and denominator by the same thing..."
Dozens of students hunched over their desks, the dry scratch of mechanical pencils copying the complex equation from the board slicing through the stale air.
But my notebook had been blank since earlier. I stared holes into the whiteboard, yet the white chalk letters blurred into a distant haze, floating aimlessly in the void.
Haa... Uh, eek...
"Got it? Now, how do we find the answer? Let's break it down."
Haaah...! Yeah, mmph... Uuugh...
I sat in the very back row, legs twisted tightly together, desperately swallowing the faint moans threatening to escape my lips.
Today's hard plastic chair felt especially hateful against my ass. The slightest shift in position sent a strange pressure and friction surging between my thighs, making the muscles inside tremble uncontrollably.
What the hell is this...
Anyone seeing me like this might think I needed a hospital instead of cram school—or point and call me a crazy bitch in constant heat during study time.
No matter the stares, it was utterly unfair from my perspective. It wasn't just my body hurting or me getting randomly horny on my own.
The reason was simple. Right now, nestled deep inside my pussy between my legs, a round, smooth wireless vibrating rotor was firmly lodged in place.
"Hoot?! Uuugh..."
I-It's so hard to hold back... How long do I have to do this...!
The reason I'd suddenly become a woman carrying a rotor around the academy, acting like some perverted bitch in heat, was the game Ye-eun Seo had proposed yesterday.
If I won, she'd let me experience adult toys as Seo-jin Lee. If I lost, I'd have to accept them as her pet. A devilish deal.
The game? Endure the entire academy day—from morning to evening—with the rotor inside, acting completely normal through the grueling schedule.
Success if I pulled it off without issue. Failure if I couldn't maintain that normalcy even once.
At first glance, it seemed easy—just grit your teeth and endure. But the "normal" part was the killer.
If I made any lewd noises drawing suspicion, or if word reached Ye-eun or Hye-won Kang that I was acting weird, it was game over. And climaxing from the toy's stimulation anywhere in the academy? Instant loss.
"You all look worn out, so let's try something easier. Limits of sequences. Easy, right?"
"Yeah, hnngh... Uuugh..."
"Already groaning? If this makes you groan, you won't survive the CSAT."
"Uwook?! Ah, uh... Y-Yes..."
I jolted, thinking he was calling on me, and snapped my head up. But he hadn't even glanced my way—he just kept scribbling on the board nonchalantly.
Phew. He wouldn't call me out over this, right...?
I sighed and glanced at the tiny fluff ball attached to my collar. It looked like a natural clothing accessory, but it was a micro microphone.
A device to check if I was hiding any suspicions from others when Ye-eun and Hye-won weren't around. It connected to a recorder in my pocket, capturing all nearby sounds through my clothes.
She'd gone this far with her sadistic thoroughness. Sighing again at Ye-eun's scheming, I lifted my head to the board.
"Hng...! Ahh..."
I'm going insane, seriously... How long...?
My panties were already soaked with juices, clinging uncomfortably to my skin. The teasing, intermittent weak vibrations only heated my lower belly more.
If she'd just cranked it high or turned it off, but no—this ambiguous torment made my body shudder and my hands clench.
I couldn't adjust it; the remote was in Ye-eun's hand, right next to me.
"Eek... Uu-eek..."
It's fine, just hold out like this...!
"So, the answer to this problem. The girl in the back, Seo-jin Lee. Stand up and answer."
"Hngg?! Y-Yes...?"
I'd been grimacing, trying to push the sensations from my mind, when the instructor suddenly pointed at me mid-lecture.
Uh... I wasn't listening?
Panicking, I gripped the desk and staggered to my feet. Luckily, the problem on the board was something I knew.
"Uh, this one... We use the quadratic formula..."
"Huuuwaaah?!"
I was desperately recalling the answer when the stimulation in my pussy suddenly intensified.
That crazy bitch.
Glancing sideways, Ye-eun was shaking the remote in her hand, flashing a sultry smile.
"Student? Something wrong?"
"N-No, n-nothing...! Th-the, hng... formula, uugh... quadratic, nn... applied..."
The vibrations pounding my inner walls were on a whole other level from the earlier teasing. Clutching the desk edge like it might crumble, I forced my legs together, rubbing them as I eked out the answer.
My breath shook wildly, words slurring, but I clenched my teeth to stifle any lewd sounds. One slip here, and it wasn't just losing the game—Seo-jin Lee's social life would end.
"...S-so, the answer is 1."
"Good, Seo-jin explained it well."
"Y-Yes... Yees..."
"As I was saying..."
As the instructor resumed, I collapsed back into my chair. Tension released, my legs went completely limp.
Less than a minute, but it felt eternal. Panting raggedly, teeth gritted, I peeked sideways. Ye-eun smirked at me, waggling the tiny remote under her desk.
Like my desperate writhing was just too adorable.
"That's class for today. Enjoy your lunch."
""Yes~""
"Y-Yes... Hnngh...!"
The tumultuous class finally ended, and lunchtime arrived— a full hour and a half break.
Normally, I'd eat with those delinquent girls, but today we had somewhere else to go.
"Seo-jina~, tough class, huh~?"
"Hey, Seo-jin. You looked off today."
"Th-that's 'cause you two amped it up mid-class... Ahoot?!"
"Don't be like that~. Bathroom before lunch?"
"...Y-yeah."
"Come on, quick. Our Seo-jin's gotta go real bad, right~?"
Hye-won smacked my back, chuckling. Legs still shaky, I followed them up to the academy's fifth floor.
It was mostly storage classrooms and supply rooms now—no one came up usually.
Cool air enveloped my sweat-drenched body as we entered the empty bathroom.
"Hye-won, watch the door for anyone coming."
"What, you get all the fun?"
"Gotta be safe~. Your turn next time."
"Fine. Have fun."
Hye-won leaned against the entrance wall. Ye-eun grabbed my wrist, dragging me to the farthest stall.
The door locked with a snap. Ye-eun turned, smiling sweetly.
"Our Seo-jin, you worked so hard carrying that rotor through cram school."
"Hnn... Uugh..."
"Time to check if you kept it in nicely during class~?"
"H-here, like this...?"
"Where else? Hurry, skirt and panties off."
Biting my lip hard, my trembling hands unzipped my uniform skirt. I dragged the juice-heavy panties to my knees and hiked up the skirt.
"Good girl~. Let's see."
"Q-quick... You crazy bitch..."
Ye-eun knelt with a grin, staring right at my pussy. Exposing my drenched slit to my friend in the bathroom felt so far from normal—but she inspected casually, like it was nothing.
"Oh my. Worried you'd sneak it out? You kept it in so obediently."
"Hnn... Of course... Why would I, hng! Take it out...!"
"Such a good puppy."
Ye-eun smiled satisfied, pulling the remote from her pocket and mashing the button.
"Hiiiiaaang?! Y-Ye-euna... Hnngh...! W-wait, nooo...!"
"So cute~. Just a little tease and you react like this."
"Huu, uuugh..."
The max-power vibrations slamming inside nearly buckled my knees—I gripped the toilet to stay up. The rotor scraped my walls, splashing juices everywhere.
Ye-eun watched my reaction with amusement, then mercifully pressed the button again. Vibrations weakened; my quivering legs steadied a bit.
"Inspection done. Lunch time?"
"W-wait..."
"Hm? Something up?"
She pocketed the still-on remote and reached for the door. But I couldn't move like this.
The morning's torment had frayed my sanity; that one max blast nearly snapped it. I desperately wanted to yank the rotor out and finger-fuck myself to a screaming orgasm.
But doing that here was instant defeat. I had to shoo her out with an excuse.
"I gotta... take a big one real quick. Smelly, so... wait outside..."
"Big one? Tense tummy, Seo-jin? Okay, Hye-won and I'll wait~ Take your time."
"Th-thanks..."
Face burning crimson, I stammered the lie. Ye-eun snickered and left the stall. I locked the door fast and slammed down the toilet lid, collapsing on it.
"Ahh... She left it on again..."
The rotor still buzzed annoyingly inside. If it were real business, it'd annoy me—but now, perfect.
Trembling hands pulled out my smartphone. Excuse was "business," so I had to muffle moans.
Only one way to fool the two outside: I turned on a game stream I often watched.
Max volume, phone jammed against the door—the stall filled with blaring game effects. This noise should drown my gasps and squelches.
"Haa... haa... I'm losing my mind..."
I wedged the phone in the door crack and slid both trembling hands between my legs.
As I grabbed the rotor's string to pull, reason flashed a final warning: Sure you won't get caught? Getting busted now ends everything.
But reason couldn't tame my beastly heat.
"Screw it... If I don't get caught, it's fine...! Hoot...!"
I yanked the protruding string, popping the rotor free. Then shoved two soaked fingers deep into my pussy.