Chapter 9 The Erotic Fantasy Shop’s Prototype꞉ The Tremble D**do-kun Test
Edited by: Kanaa-senpai
”Alright, I guess that’s about right…”
After submitting a material-gathering request at the Adventurer’s Guild, I hurried back to the shop and immediately started crafting the first prototype of the Tremble D**do-kun with the materials I had on hand.
I’d brainstormed a bunch of designs, but for the first test run, I decided to go with a simple internal mechanism: pushing a Metag stone¹ that I’d attached to the tip of the d**do, right up from the base, would make the Pororo Snail’s shell start to vibrate violently. It’d be fun if I could make a switch-operated version someday, or even something with a remote control, you know?
”Hey, Lily, the first one’s ready.”
”Already, Master!? You’re so quick, as expected!” Lily cried, her voice bright with praise.
”Heh, it’s not exactly ready to sell yet. C’mon now, take your shoes and socks off and get over here.”
Feeling pretty great from her compliments, I gestured for her to come closer. She, as usual, whooshed them off in one go and plopped right into my lap, feet bare. She’s like some kinda defenseless cat, I mused, poking her super-ticklish soles as is my habit. Yup, the reaction is absolutely fantastic.
”Mmm…♡ Honestly, you’re such a pervert, Master…” she squeaked softly.
”Why are you acting surprised now? Don’t you prefer having a pervy master?” I teased back.
”I plead the fifth!” she insisted with a playful pout.
We kept up the light banter as my free hand grabbed her ankle. The sensation of that ridiculously ticklish foot was instantly hilarious. I traced along the arch, enjoying how she instantly squirmed. Scraping lightly under her toes, I targeted the spot that always made her lose it, watching her try to hold back giggles.
”Haah…♡ You get me laughing in no time at all, I swear…” she gasped in an intimate murmur.
”…Did you say something?”
”It’s nothing, honestly! See, now tickle my earlobe too!”
”Alright, you got it.”
I didn’t need to be told twice. I kissed the side of her neck while tenderly wiggling a finger behind her ear. The hand on her foot didn’t rest either; I scribbled right under her toes with my fingernail. The giggles poured out immediately, and though I tried to shush her, they just kept coming, refusing to stop.
”Seriously, you’ve got ticklish feet, don’tcha?”
”Ugh! Master, that’s not a nice thing to say! You should be saying things like, ‘That’s my Lily‘ or ‘You’re so sensitive and cute,’ like you can’t hide your sweet, possessive side!” she pouted, clearly worked up.
”Yeah, yeah, you’re cute, you’re cute,” I humored her, brushing aside her indignation.
I paid her no mind, grabbing the Tremble D**do-kun-kun prototype. I flipped the mechanism, and the d**do began to vibrate with a low, churning rumble—“Veeeet!”—just like the electric feather from my old world. I honestly didn’t think I could reproduce the function so perfectly.
”Th-This is the Tremble D**do-kun-kun…!” Lily swallowed hard.
”Yep, pretty cool, huh? I figure if you press this against a ticklish spot, you’re gonna laugh pretty hard.”
I could feel her tense up in my arms; she was clearly bracing herself. I decided to start by touching the tip of the shaking vibrating d**do to her earlobe.
”Agh!♡♡♡ Wait, Master!♡ Wh-What is this?!♡” she shrieked, totally taken aback.
”That’s the vibration feature. How is it? Does it tickle?”
”Tickle?! No, it’s…! I-I’m shaking, I can’t handle it!♡ No, stop it, please!♡♡♡” she begged, her voice high and desperate.
I caught her hand as she twisted and writhed, gently prodding her dodging earlobe with the tip of the Ochimpo-kun. Each contact made her react with a massive TWITCH! Her response was even better than I’d imagined. I paused the device to get her feedback.
”So, first impressions so far?”
”Haah…♡ Haah…♡ I-It’ll sell. No doubt about it!” she gasped, utterly spent.
”Hold on, that was just your earlobe, though, wasn’t it?”
”I-I can’t fight the tickles… It feels like ‘laugh attacks’ are being forced right into me! This is seriously dangerous… Isn’t this gonna get regulated by some law eventually?” she worried, trying to cover her still-tingling earlobe.
”You think so? I just think you’re extra ticklish,” I observed.
She was still rubbing her ear, trying to soothe the lingering buzzing sensation—it was a huge shock to her, seeing as it was her first time with a vibrating object.
”A-Are you going to use this… down there too?” she asked, eyes wide.
”Of course. That’s why I built it into the d**do in the first place.”
I opened her legs while I spoke, pulling her into a ‘manguri-gaeshi’² pose. Her bare soles, now facing upwards, were even more vulnerable than before, the arches practically begging to be tormented.
”M-Master…? If I say stop, you will stop, won’t you…?”
”Hmm, well, I’ll think about it.”
”Just thinking about it isn’t enough! Hyaaah!♡♡♡ Agh!♡♡♡ Aah!♡♡♡ AAAGH!♡♡♡”
I gave her a half-answer and pressed the Tremble D**do-kun-kun right against the center of her sole, and Lily instantly started thrashing, laughing uncontrollably. I could see the tension in her muscles, but she didn’t pull her feet away—the pride of my tickle guinea pig was clear.
”Hey, what’s it feel like?”
”Agh!♡ No!♡ I’m c-coming apart laughing!♡ Stop, pleeaase!♡♡♡”
It seemed like she was thoroughly losing it. Lily was flailing her hands and legs, trying to find a way to escape the tickle hell, but the inverted pose kept her mostly pinned. Only her feet were scrunching and wiggling like crazy.
What if I increase the stimulation? Curiosity got the better of me. Lily was starting to drool from laughing so hard, so I twisted the Tremble D**do-kun-kun and pressed it in a little harder.
”I’M C-COMING!♡♡♡ I’m gonna explode laughing!♡♡♡ Stop it, stop it!♡♡♡” she pleaded, tugging at my clothes.
Oh, she looks so pathetic. She’s just so adorable when she’s like this. I almost wanted to keep pushing her until she was a complete mess… Oops, hold on, I gotta stop. Realizing I was on the verge of developing a new, questionable kink, I pulled back and freed her tortured sole.
”Haah!♡♡♡ Haah!♡♡♡ Hngh…♡♡♡”
I stroked her feverish cheek, which was taking a while to return to normal. I turned off the d**do’s internal mechanism and gently patted her head, which was pressed against my lower stomach. I brushed aside her pink hair and wiped the tears of laughter away. Once her breathing finally calmed down a bit, she glared at me, pouting her lips.
”T-That was terrible…♡”
”But you survived it, right?”
”It was too much. I thought I was going to laugh myself unconscious…”
”My bad. Don’t worry, though. I plan on using you for a long, long time.”
”Ugh…♡ W-Well, I guess I trust you on that…” she grumbled softly.
”Good. Now, how about we try it between the toes next?”
”Agh!♡ Are you still going to keep going?” she questioned, shocked.
”Of course. This is where the real test begins.”
Lily looked up at me, her gaze flickering around for a moment before she finally closed her eyes, took a deep breath, and sighed, “I understand…” It seemed she had braced herself. I coated the Tremble D**do-kun-kun with a bit of lotion so it would slide better and placed the tip against the gap between her toes.
”I’m gonna slide it in without turning it on first, okay?”
”Y-Yes, Master…♡”
Shluuub… The silent d**do was swallowed between her wriggling toes. Testing it in this pose let me watch her foot tense up, which was extremely funny.
”How does that feel?”
”How does it feel? It just feels like your usual Ochimpo-kun…” she said, confused.
”That’s the important part. I need to know if the vibration mechanism messes with the d**do’s basic function.”
”I see… In that case, there’s no problem at all.”
”Great. Now, I guess it’s finally time to turn it on.”
”Um, Master…?”
”What is it?”
”I’m sorry if I punch you…”
”Ah… Understood. I’ll do my best not to get hit, then…”
I didn’t think she would actually hit me, but you never know what kind of desperate strength people find in the heat of the moment. I secured Lily with my legs even more carefully than before and, with a drumming heart, started up the Tremble D**do-kun-kun. “Veeeet!” The d**do began to tremble wildly between her toes.
”Agh!♡ It’s here!♡ Hii!♡ Agh-agh-agh!♡♡♡ AAAGH!♡♡♡”
She tensed up, but her reaction wasn’t as overwhelming as when I used it on her sole. Well, I guess between the toes is slightly less intense. I began to wiggle the now-vibrating Ochimpo-kun back and forth with a squishy sound.
”Aah!♡ I-It’s amazing!♡ This is gonna sell!♡ It’s absolutely gonna sell!♡♡♡” she cheered through helpless laughter, wiggling her toes like crazy.
Tears of laughter kept pouring out with every motion—she was as ticklish as always. I started changing the angle, pressing it against different spots between and under her toes. I know her feet intimately: she taught me all her weak spots during previous Ochimpo-kun experiments, and we’ve been together countless times since then.
I pressed up, then down, vibrating her known deadly spots. I utilized the head of the d**do to effectively dig and churn the gaps. Then, I finally decided to go for the main event: vibrating the most sensitive part—the hollow under her toes.
”Alright, I’m gonna push it right into the deadliest spot now.”
”D-Deadliest spot!? M-Master, please don’t forget to be gentle!♡” she pleaded.
”Relax, relax. Here we go.”
”Agh!♡ Wait!♡ Hyaa!♡ AAAAHHHHHHHH!♡♡♡♡”
As I ground the d**do under her toes and crushed the ticklish hollow, Lily’s reaction became violently intense. She let out a loud, pathetic shriek of laughter, thrashing and struggling to escape the torture. Her toes clenched the Tremble D**do-kun-kun, and the gaps could be seen twitching rapidly.
”What is this!♡♡♡ My foot! My poor FOOOT!♡♡♡” she screamed.
”What about your foot? Does it tickle too much when I shake that spot?” I asked, dominant.
”My tummy! I-It’s gonna burst from laughing!♡ This is terrible!♡ Stop it!♡ Don’t be so rough!♡♡♡” she cried.
Lily stared down at her own foot with an expression of shock, unable to comprehend what was happening to her. She even broke free of my restraint and desperately rubbed the area under her toes.
”AAGH!♡♡♡ My foot!♡♡♡ It’s my weak point!♡♡♡ It’s gonna break!♡ It’s gonna be ruined!♡♡♡♡”
Touching the area turned out to be a bad idea. The vibration became even clearer, and Lily began to shake her hips violently from laughing so hard. I didn’t care; I kept pushing and pressing down on the deadly hollow. Though she was practically paralyzed with laughter, she tilted her chin back and exploded into another fit.
”M-Masterr!♡♡♡ Stooop it!♡♡♡ Forgive me!♡♡♡ I’m laughing!♡ I’m always laughing!♡♡♡♡” she wailed, her voice thick and slurred.
”Hmm, just a little more. I know you can survive now, so next is the safety test. I’ll stop right at the breaking point, promise.”
”Nooo…♡♡♡ OOOHHHHAAAAAHHHH!♡♡♡♡♡”
I gave one final, powerful thrust between her toes, and Lily let out the loudest shriek of laughter she had today. Pshoo! Bushaa! A massive sneeze-laugh explosion erupted, spraying tears and spit everywhere. After that, I thoroughly enjoyed the safety experiment, which was really just an excuse to continue tormenting her poor ticklish feet.
* * *
”H-Ha-hee…♡♡♡ Ah, aah…♡♡♡”
Several minutes later, Lily was sprawled on the floor, a completely ruined, boneless mess. Lubrication dribbled constantly from her open, gaping entrance, and other fluids streamed down her face. Yup, the effect is absolutely profound.
”Hey, are you okay?”
”I-I’m nah okayy…” she slurred, her voice barely a whisper.
Well, if she can answer, she’s fine. I wiped her face and gave her some water. Her whole body was limp, like a discarded doll. And the best part? No matter where I touched her, she’d twitch and let out a sensitive little “Angh!♡” or “Hing!♡” This gave me an idea for one more experiment. I started peeling off my own clothes.
”Huh…? M-Masher, whad-a-ya doin’…♡?” she slurred.
”Hmm? Well, since we’re already here, I figured I should test if we can use this for actual one, too.”
”Ha…? W-Wha’s that mean…♡”
”It means I wanna see how your already-ruined entrance feels, and what happens if I do it at the same time.”
”C-Cruel!♡♡♡ Devil!♡ Monster!♡ Inhuman!♡♡♡” she shrieked, her exhaustion instantly forgotten.
”It’s fine, it’s fine. If you break, I’ll just use a healing potion on you, okay?”
”UWAAAAAAAHHHH!♡♡♡♡♡♡♡”
I plunged in without mercy, and Lily let out the strange cry of a small, cornered animal. Her v**ina didn’t clench as tightly as usual; it was soft and cushiony, which was incredibly comfortable. That was an unexpected and welcome side effect.
”Now, I’ve been the one getting squeezed dry lately, so you’d better brace yourself, just a little.”
”Agh…♡ Agh…♡ Aahh…♡”
Lily looked up at me with an expression of utter despair. I activated the Tremble D**do-kun-kun‘s mechanism right in front of her. As the low “Veeet!” started to resonate, her v**inal entrance happily tightened and clamped down on my d**k.
—
Summary:
The Protagonist, a genius shop owner, begins testing his latest erotic invention, the Tremble D**do-kun-kun—a d**do with a magic vibration mechanism, on his loyal slave-assistant, Lily. The experiment quickly escalates into a furious, over-the-top explosion of pleasure, overwhelming her body and senses. From her sensitive nipples to the deep, shattering sensation in her womb, Lily is driven to a complete state of sensual ruin. Despite her dramatic protests, the device proves an immense success, validating its powerful effect on the female body and setting the stage for the next, highly-anticipated sex experiment with her master. This innovative adult good is a guaranteed bestseller for the fantasy shop.
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Character Insight:
Lily’s character is defined by her absolute, yet melodramatic, submission to her master and her own hyper-sensitive body. Her frantic, articulate cries of distress—even as she’s uncontrollably climaxing—reveal a humorous internal conflict between her desire to please and her inability to withstand such immense sexual pleasure. She’s a perfect ‘test subject’ for this erotic comedy as her extreme reactions provide both comedy and clear feedback on the new invention. Her willingness to submit, even when expecting to ‘break,’ underscores her fierce loyalty and trust in the Protagonist.
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Behind the Scene:
This chapter is crucial for the plot as it successfully introduces and proves the efficacy of the first modern-style vibrator in the fantasy world, a key adult good for the Protagonist’s shop. The use of the Metag stone and Pororo Snail shell establishes the world-building for magic-tech gadgets. The entire scene serves to deepen the dominant-submissive bond and the playful, sexually-charged nature of the master-slave relationship. The final segment, where the Protagonist removes his clothes, sets a hook for the next chapter’s sex experiment, transitioning from pure testing to practical recreational use.
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T/L:
1 Metag Stone: An invented material in this fantasy setting used to mimic a vibration motor or other small, responsive mechanical component, used for creating modern technological items. ↩
2 Manguri-Gaeshi: A position where a person is lying on their back with their legs pulled up and spread wide, often with the knees near the head, fully exposing the v**inal area. ↩
Notes:
• Lily – the sl*ve and primary experiment subject for the magic shop, ‘Harvest.’ She has striking pink hair, Blue eyes, medium breasts, which the Protagonist associates with being ‘wanton’. She has a working knowledge of magic, which she kept hidden from the slave trader.
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Edited by Kanaa-senpai.
Thanks for reading.
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