Volume 4 Chapter 6 Tentacle Slime Surprise꞉ The Spa Treatment Goes Rogue
Edited by: Kanaa-senpai
”This looks like one of those treatment tables from a beauty salon, right?” Himari asked, tilting her head.
”Yeah, maybe this is—?” Kairi stopped mid-sentence, her usual practicality replaced by curiosity.
Himari and Kairi had just stepped through the gate Ecoa opened, finding themselves in a specialized room. When they saw the sleek, clean table, they naturally thought of a relaxing spa session. They couldn’t have been more wrong.
”Well, look at this. It says, ‘Please undress completely and lie down on your back,’” Kairi sighed, sounding resigned.
”…Guess we have to, then.”
Near the table, a small sign detailed the instructions. The two girls quickly glanced at it, then began to remove their clothes, letting them fall in a pile. Completely undressed, they climbed onto the table, lying on their backs in anticipation. The entire scene was visible on the main monitor for the others.
”Heh-heh-heh.” Hibiki giggled, clutching her stomach.
”Do you think they’ll be okay…?” Kirino asked, her eyes full of worry.
”They don’t suspect a thing, do they?” Koharu observed, her tone a mix of fascination and mild anxiety.
While everyone knew Hirose wouldn’t be performing the treatment himself, the two adventurers had no idea about the monsters involved and couldn’t possibly imagine what was coming.
”—The session is starting now.”
Ecoa confirmed the girls were on the table via the monitor, then raised her right hand. Instantly, a small, squishy slime appeared at the far end of the table. It split into two wiggling blobs, which sprouted numerous tentacles. The tentacles stretched out, slithering toward the girls.
”Oh, wow… it’s so warm,” Himari whispered, a faint smile on her lips.
”It feels just like… Hirose’s hands…” Kairi breathed out.
A light blue, semi-transparent tentacle gently brushed against each girl’s cheek. Strangely, it felt remarkably similar to Hirose’s touch.
”The sensation is copied from Hirose’s memories,” Ecoa explained formally.
”Seriously?” Hirose gasped, stunned.
”Yes. Even though they’re slimes, they act like extensions of Hirose’s limbs.”
”Man, it’s like I turned into a slime or something,” Hirose mumbled, rubbing his temples.
While the slimes looked nothing like Hirose, their touch was undeniably like his. But then, the initial confusion turned to alarm as Himari and Kairi noticed something strange.
”Huh… why does it feel like there are way too many hands?” Himari murmured.
”But it feels… so good… ah!” Kairi choked out, her breath catching.
Giving in to the pleasant caresses, both girls opened their eyes, only to see countless tentacles pressing softly against their skin.
”Gyaaaaaaaahhh—?!” they screamed in unison.
They tried to leap up but couldn’t. The tentacles had already wrapped tightly around their waists, wrists, ankles, and thighs, holding them firmly in place.
”What?!” Himari yelped.
”This was Hibiki’s idea,” Ecoa explained calmly.
”W-What did you suggest?!” Kairi demanded, her voice shaking.
”This is based on Hirose’s ‘Skin Quality Improvement’ skill. Hibiki asked me to optimize it for intensely pleasurable sensations.”
”What the heck does that mean?!”
On the monitor, the girls struggled against the tentacles, their faces flushed. The effect had started, making their skin overly sensitive.
”Oh, man, you’ve got to be kidding me…” Hirose mumbled, shocked.
”Hey, Hibiki! You—you little troublemaker!” Himari screamed, realizing they’d been made into test subjects.
But Hibiki just laughed, clutching her sides.
”No, no, no! This is bad!” Kairi pleaded.
”Wait… is that thing going to—Mphh?!”
The tentacles pulled their legs apart, exposing them. More tentacles floated toward their mouths, silencing their screams, while others clamped onto their chests.
”Mmmph—!!”
The tentacles began to move over their bodies, cleaning their skin. Himari and Kairi frantically realized what was happening.
(Like this, completely exposed?!) Himari thought.
(No way… are they actually going to?!)
The last tentacles moved toward their most private areas.
”These slimes are sterile, ensuring cleanliness. The posterior area is excluded from the treatment,” Ecoa’s voice rang out, offering little comfort.
But that wasn’t what the girls were worried about.
(That’s not the important part!) they screamed internally.
The tentacles stretched toward their lower bodies.
(Oh no… this feels… too good…) Himari’s mind raced.
(This is… bad… but it feels like Hirose…) Kairi thought breathlessly.
The slime tentacles were slightly moist, triggering a powerful effect. Hirose’s original treatment was just simple rubbing, but Ecoa’s slimes were designed for maximum impact.
(Oh no… this is too much… I can’t… I’m going to…) Himari’s body tensed.
(No, no! Don’t, don’t, don’t! NOOOO!!) Kairi shrieked internally.
Both girls reached their limit almost instantly, their bodies convulsing violently.
The onlookers, finding the scene too explicit, asked Ecoa to turn off the monitor.
”They’ll be fine,” Ecoa assured, though no one was convinced.
* * *
—Session Terminated.
The treatment was initially meant to last only six minutes, but Ecoa had extended it to a full hour to give the adventurers a more thorough and enjoyable experience. While Hirose and the others enjoyed tea with the monitor off, they already knew what they’d find. When the screen flickered back to life, the two adventurers were exactly as predicted.
”I cahn’t… taik it annymore…” Himari whimpered, barely coherent.
”Felt too good, huuuh…” Kairi mumbled, her voice slurred by pure ecstasy.
Their bodies twitched and spasmed, faces twisted into expressions of complete, blissful exhaustion, as if they’d been given every joy a woman could know. A spray of liquid was scattered all around the table, a stark visual testament to the sheer intensity of the treatment.
”Oof…” Hirose just stared, completely speechless.
He had seen similar sights from his own ministrations, of course, but witnessing it from a third-person perspective was a shock.
”Wow… they look like they had the time of their lives.” Hibiki marveled, still thoroughly pleased.
”I mean, that is true, but it’s still kind of sad for them.” Kirino observed with a touch of pity.
”Aba-baba-bah…” Koharu choked out, her face flushed.
”Ahem. …We should really thank Hibiki-san’s friends.” Hirose coughed, trying to regain his composure.
Each of the spectators sighed in relief, grateful that they hadn’t been the ones subjected to the experiment. But one person in the room was starting to feel a different kind of heat.
”I might be kind of interested, actually.” Koharu admitted, her voice low.
”Koharu?!” the others gasped in unison.
”There’s no way to escape it, right?” she pressed, eyes sparkling.
”It would be nearly impossible, even for a powerful adventurer, no doubt.” Ecoa confirmed.
”Huh…” Koharu’s cheeks were noticeably pink.
”Well, let’s put that aside for now,” Hirose interjected quickly. “I gotta say, though… usually, tentacle monsters are all about dissolving clothes, attacking, and causing harm. It’s strange that this one can be used for beautification.”
Koharu, with her knowledge gleaned from reading erotic manga, talked about the difference between this slime and the tentacles she knew from fiction.
”Imagine finally making it to the dungeon’s goal, only to be stripped naked like that,” Hibiki said, treating the entire affair as if it were happening to someone else. “Adventurers sure have it rough.”
”Y-Yeah, I was thinking about that, too,” Hirose conceded. “Maybe we should have a place for them to wash up? Like the hot spring Ecoa first suggested, or at least a simple shower.”
”That’s a great idea! Most esthetician’s¹ offices have a shower room!” Kirino agreed instantly.
”Then I shall construct one.” Ecoa stated.
”It’d be nice to make sure they can go home feeling relaxed and comfortable in the end.” Hirose concluded.
At this point, the entire setup was drastically different from any typical dungeon. The party couldn’t help but wonder what the first real adventurers would think. But for now, the experiment was over, and they understood exactly what the Tentacle Slime Treatment could do. The Methodology still needed further tweaking, but the next topic was setting the entry fee and usage conditions. The dungeon creation project was far from finished.
—
Summary:
The chaotic debut of the Tentacle Slime Treatment left adventurers Himari and Kairi in a state of ecstatic, nude exhaustion. What started as a simple dungeon spa treatment turned into an intense, full-body sexual assault by pleasure-optimized tentacles, secretly arranged by the mischievous Hibiki and flawlessly executed by the AI, Ecoa, using the sensations from Hirose’s powerful ‘Gift’ for enhanced gratification.
The sight of their friends’ total physical surrender to the monster’s explicit pleasure sent shockwaves through the observing party, especially igniting a surprising, deep desire in the quiet Koharu. Now, with the method tested—to an extreme degree—the team must finalize the dungeon’s rules and amenities, like a much-needed shower, before the first real fantasy adventurers arrive.
—
Character Insight:
The shocking scene provided deep insight into the party dynamics. Hibiki is revealed as an actively mischievous instigator, happily prioritizing extreme fun over her friends’ initial comfort. Koharu, the quiet bookworm, is unmasked as the party’s resident masochist, showing an explicit, heated attraction to the idea of inescapable, monster-delivered ecstasy. Meanwhile, Hirose struggles to reconcile his gentle ‘Gift’ with the explicit sexual chaos his friends and his AI create, proving his original power is far more potent and dangerous when weaponized for pleasure.
—
Behind the Scene:
The primary goal of this scene was to test the limits of Hirose’s ‘Skin Quality Improvement’ skill when applied to a monster-based automated system, and to introduce the Recoil Effect in its most potent, explicitly sexual form. Ecoa’s ability to extract tactile memory from Hirose and apply it to the slimes is a key technical function, ensuring the tentacle massage feels ‘just like Hirose’s hands’ despite the shocking visual. The team’s discussion at the end serves to transition the focus from explicit experimentation to the logistical problems of running a sexually charged dungeon spa, moving the plot toward the next stage of fantasy world-building.
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T/L:
1 [esthetician] ↩: A beauty therapist who performs cosmetic skin treatments, similar to a beautician. The term is used here to emphasize the initial, clinical expectation of the treatment.
Notes:
• Ecoa – The Guardian of the Dungeon Core, a beautiful entity with long blonde hair, slit eyes, and distinctive pointed ears reminiscent of an elf. She initially appears in black ceremonial robes, which instantly transform into a revealing, classic black maid uniform. Her existence was previously undetectable by ‘Appraisal’ Gifts. Her sole purpose is to serve and support the Dungeon Master, Hirose.
• Kirino – Strikingly beautiful with blue long hair (F, 168cm), Kirino is gifted with ice magic and feels isolated because of her appearance. Hirose’s Beauty skill helps her improve her self-image and social comfort, directly affecting Kirino’s relationship with her family and classmates.
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Edited by Kanaa-senpai.
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