#19 Backdoor Development (3)
Seohyun wasn't unaware of anal sex. Like any woman with a sex drive, she'd rummaged through porn sites before, and she knew that backdoor play was mainstream in the AV industry. But just because it was major in porn didn't make it normal in real life. It was the hole for excretion, always seen as filthy—that prejudice had kept her from ever touching it during masturbation.
And now, that hole was being probed by Nayae. With fingers, various tools, twisted and stirred slowly for agonizing hours.
"Haugh... ughk..."
"What should we try next?"
A long dildo with bumpy ridges along its uneven surface glistened with lube, transformed like a candied hawthorn. It slid smoothly out of Seohyun's anus, popping against her sensitive spots with each withdrawal. At first, only revulsion surged through her. A bloating fullness incomparable to vaginal insertion. As her tight rear muscles loosened, the invading foreign object wormed its way in serpentine folds, making her want to vomit.
But Nayae didn't give up on Seohyun, who hadn't reached climax yet. With patient dedication—like truly "developing" it—she'd stimulated her anus for over three hours. And Nayae's efforts were already bearing fruit. Piercing the girl's delicate sensibilities and the numbness born of denial, it had successfully kindled embers of orgasm deep in Seohyun's lower belly.
"Nayae... Nayae... just a second..."
"What's up?"
Seohyun, who hadn't made a sound beyond strange gasps, finally spoke, and Nayae paused happily. Melted down by the prolonged anal teasing, Seohyun still clung to one clear resolve: she absolutely wouldn't cum from her backdoor.
"I... I'm gonna... cum again..."
"Yeah? Then beg for it."
The camcorder, filming diagonally before, had shifted right in front of Seohyun's face. If she came from her asshole, her expression would be captured in vivid detail.
"Hesitating? Hurry up and beg like, 'I don't wanna cum from my shithole, boo-hoo~' Or I'll record your first anal orgasm and watch it with Teacher later."
"Please... I beg you... I absolutely don't want to cum from my backdoor..."
As the plea escaped her lips, Seohyun slipped into polite speech automatically. Whenever Seohyun begged humbly like that, Nayae would pause the anal training. It gave Seohyun just enough time to calm the orgasmic precursor swelling right up to her womb. She no longer even thought Nayae's attitude was too much. All that circled her mind was the desperate urge to avoid further humiliation.
"Oh? It has a switch too."
"Haugh... ugh... uhk... Nayae-nim... please stop..."
Something Nayae touched made the long, tombstone-like object lodged in Seohyun's anus start vibrating. The unpleasant scraping at the back of her gut made Seohyun shudder violently. She could feel the climax, brimming at the threshold, sloshing over like breached surface tension.
"Please... stop tormenting Seohyun's... eek!! ... ragged asshole... haugh... uhnngh..."
"Got it~"
A click, and the vibration ceased. Each time she begged for a reprieve from climax, the required phrasing grew more degrading. Now, anything short of extreme embarrassment earned no mercy—Nayae just left her hanging. Begging her same-age friend out loud was shameful, but cumming from her backdoor was far worse. Absolutely, absolutely not.
"What's with that? Begging like that over something so minor?"
Giggling, Nayae moved the camera aside and spread her legs wide, sitting in front of Seohyun. At first, she'd wait five minutes for Seohyun to calm, but boredom led to this—receiving cunnilingus from Seohyun while sating her own lust. Watching Seohyun break bit by bit had even aroused Nayae, who usually had no interest in girls.
"Good girl, so here's your reward. My pussy that you wanted to suck so bad."
"Th... thank you."
Seohyun hesitated before extending her tongue long and burying her face between Nayae's thighs. Her timid tongue delved carefully into Nayae's soaked, sex-flushed petals. Forced to swirl it not just over the clit but deep inside, her extended tongue now throbbed with numbness.
"Haa... happy now, Seohyun?"
"Yethh... tho happwy..."
Seeing Seohyun on all fours like a dog, ass up, face buried in her crotch slurping at her sex, eased Nayae's inferiority complex toward her a little.
"Hnngh... deeper..."
"Ugh... ulp..."
Nayae grabbed Seohyun's hair, grinding her entire mouth against her folds like a washcloth. Seohyun's lips, mouth, even nose drenched in fluids struggled faintly, but Nayae held tight. Tongues and lips were limited tools—pleasure fell short. Still, Teacher would surely pound her deep with something huge when he returned, rewarding her diligent training. Killing time like this, Nayae shifted back behind Seohyun.
"Next up is this."
Seohyun, who once screamed at even three small anal beads, could now swallow decently sized dildos. For this evolved ass, Nayae's experiment was a grotesque dildo sprouting silicone tentacles like a sea anemone. The switch suggested vibration too. What would it feel like inside? Without a word, Nayae slowly pressed the tip into Seohyun.
Thanks to hours of pistoning and her position, the anal mucosa was half-relaxed already. The dildo pierced it with surprising ease. It looked massive due to the tentacles, but the core shaft wasn't that thick.
"Eek... wha... what'd you put in...?"
An alien sensation incomparable to before. Dozens of tiny hands scraping her rectal walls—disgust made Seohyun glance back instinctively. Ignoring her, Nayae flicked the switch. Three levels: low, medium, high.
Glittering lights accompanied vibration and rotation. "Whoa..."
"Eh... ah... it's... spinning... huung...!!!"
Vibration was one thing, but rotation? From the handle, the ferocious tentacles churned Seohyun's guts. Her body writhed uncontrollably at the unimaginable feel. This was dangerous. It ignited orgasm from an unforeseen angle, instantly. No way to endure it.
"Na... Nayae-nim, wait..."
"Just the first level and you're whining?"
Nayae gripped Seohyun's twitching, clenching ass—alternating tight and loose—and cranked it to high.
-Whirrrrrr!!!
Nearly drill-like ferocity, centrifugal force stiffening the unused tentacles outward.
"Hyaek... uuuughhh... p... please stop..."
"Seohyun."
Knowing the freakish toy was rendering movement impossible, Seohyun still crawled forward instinctively, fleeing pleasure. Nayae pinned her ass, thrusting the dildo deeper. Straddling her flushed body to prevent escape, she gripped the base tight against the anal squeeze.
"I wanna see you cum from this."
"Het... uhnik... no... that's... no... please..."
"Sorry, I know we have to keep promises... but this is too hot."
Seohyun's body began trembling violently. Anal erogenous zones don't climax easily—without innate talent, it takes ages of development. Unlucky for her, Seohyun was wired to feel it intensely back there. Nayae had primed it for hours. Add the anemone dildo's assault—no escape.
Nayae had planned to make her cum anally from the start. She just obsessed over the best tool for maximum reaction.
"No... no... no no no... stop... don't wanna cum... don't wanna... uheeeong..."
Pinning the writhing Seohyun reverse-grip, Nayae plunged the dildo in and out. Rotation, vibration, thrusting—triple assault crumbled the human dignity she so desperately guarded.
"Haaang... aaaaahk... ❤"
Nearly a scream, Seohyun convulsed. So violent even Nayae's weight nearly bounced off. Yanking her ponytail to force her head toward the camera.
"Camera's rolling. Smile for it~ You're a model, Seohyun."
"Ungkit... smi... pfft..."
No mercy for Seohyun's symphony of obscene moans. Nayae kept pounding the freshly orgasmed anus. Post-climax, the female body hypersensitizes—tiny stimuli trigger peaks in seconds. No intent to end the first anal orgasm after three hours with just one. The now vice-tight dildo whipped up and down mercilessly.
-Splurch squelch squelch
"N... nooo... cumming... cumming again... so... haaak... ❤ sensitive nowww... huuk...!!!"
"That's it, good girl. Cum more~ Feel even better, Seohyun~"
"Stooop!! Stop... Nayae... ❤ stooop...!!!"
"No."
Second climax. Less thrashing from exhaustion, but pleasure twice the first. Hypersensitivity amplified the backlash.
"Huaak... puhuh... c... can't breathe... p... please stop... hiiik... ❤"
Even as she crested, Nayae sped up the thrusts instead of easing off. Seohyun was a vending machine now—insert motion, dispense orgasm. As a girl, Nayae could tell: Seohyun was in ecstasy. Vicarious thrill made stopping impossible.
"Describe your slutty state right now, and I'll stop."
"I... meee... shithole... dildo... stu... stuu... stuffed... ❤ cumming... again... againnn... nooo... no..."
Seohyun's headshake halted. Third orgasm already. The dildo motion grew stiffer. But no pause. Persistent pistoning yielded fourth, fifth in succession.
"You said you'd stop... pleeease... hyaek... ❤ ugrrrghhh...!!!"
"Count the exact number of tentacles in your ass, and I'll really stop. Take your time."
Dozens spinning wildly—impossible even for Nayae. Yet Seohyun desperately tried, unwittingly fixating on the sensation.
"One... twwooo... hiiik... ❤ cumming... againgg!!!"
"Only to two? Hehe, try harder."
Her degrading expression—eyes rolling back, hips bucking—captured perfectly as she neared blackout. Nayae kept at her "arm workout" until the tenth, when Seohyun finally passed out.