Dungeon-Succubus-Tester 239

Chapter 239 Power of the Drill-C*ck and the Dungeon Construction Dept*


Edited by: Kanaa-senpai


 ”That monstrous c**k… first, I have to make sure it’s safe. As your first concubine, it’s only right that I put my body on the line,” Sheena said.


 She began to peel off her negligee, her eyes shimmering with raw anticipation as she stared at my new Drill-Cock.


 ”Heh, fine. I’ll let you experience it firsthand. Just try not to break, alright?”


 ”Mm… just looking at it has me… please, Master, hurry…”


 Sheena stripped down to her blue lace panties and sat on the sofa in the service room. She spread her legs wide, sliding the lace to the side to beckon me. She really was a woman who knew exactly what I wanted.


 Seeing her glistening heat through the shifted lace sent a surge through me. I moved in, pinning her down and pressing the head of the Drill-Cock against her entrance.


 ”I’m going in.”


 ”Yes… please, shove that wicked thing into Sheena’s lewd p**sy,” she replied.


 The moment she spoke, I thrust the meat-stick inside.


Squelch


 The drill-head ground its way into her soaking-wet depths. I could feel the ribbed walls of her v**ina locking into the spiral grooves of the shaft, a twisting friction that felt incredible.


 ”Ah! Nngh… i-it’s insane!” Sheena cried.


 She looked shocked, yet clearly overwhelmed by the sensation. I buried the entire length inside her.


 ”Ah… it’s hitting deeper than before… and it’s so hard…”


 ”I’m going to bore right through you with this. Get ready.”


 ”P-please… AHHHH!”


 I grabbed her ankles, forced her legs wide, and began slamming my hips into her with everything I had.


Slap slap slap slap slap


 With every withdrawal, the drill-grooves scraped out the overflowing fluids, drenching the sofa.


 ”Ah! Ah! Oh—it’s hitting the back! W-wait… please… AHHH!”


 She was being excavated. The sheer intensity of the pleasure had her eyes wide and unfocused. She reached out to try and slow me down, but I couldn’t stop. Every thrust sent the ridges of her internal walls sliding through the grooves, giving me the most intense stimulation of my life.


Dammit, this Drill-Cock is too much. I’m not gonna last… but I can’t stop!


 ”Kh… Sheena, I’m c**ming!”


 At record speed, I reached the limit.


 ”Ah! Oh! Hah… let it out… please… I’m… I’m going to lose my mind!”


 Sheena’s head thrashed back and forth, her hair a mess, her eyes fixed on the ceiling as she cried out. I collapsed onto her, kissing her deeply as I unleashed everything deep within her womb.


Squelch! Splurrrrrt!


 It was a massive, unending release unlike anything I’d ever experienced.


 ”Nngh… mmmmnnn!”


 The volume triggered a forced orgasm in Sheena. She choked on my tongue, her legs locking out straight as her whole body convulsed.


Splurt! Squelch!


 A second wave hit. My mind went blank from the sheer bliss as I pumped my seed into her. By the time the second wave finally eased, I was slowly grinding my hips to squeeze out the very last drops.


 ”Afu… nnn… haa haa haa…”


 ”Phew… that was incredible, Sheena,” I said.


 I finally broke the kiss and slowly withdrew. Sheena’s entrance clamped shut immediately, refusing to let a single drop escape.


 ”That was… more than I ever imagined,” she whispered, smiling up at me while tracing herself.


 ”Yeah. It felt better than I expected, too.”


 Actually, it felt too damn good. This is a problem. The grooves concentrate the stimulation, doubling my sensitivity. If I’m up against a woman with a Meiki¹, this Drill-Cock is a double-edged sword. At this rate, Kyoko’s gonna ask me why I’m always in Quick-Draw mode. I don’t need an ability that makes me finish faster—give me one that doubles the woman’s sensitivity!


 ”Master… now, let’s confirm how it feels from behind.”


 Sheena pulled off her drenched panties, grabbed the back of the sofa, and presented her backside to me. Her large cheeks and tail swayed enticingly.


 ”Yeah, alright.”


 She clearly wasn’t satisfied yet. It stung a little—it felt like she was saying I finished too early. Fine, I’ll just have to keep going. I looked down at “junior,” but he was looking a bit limp.


That’s weird. Usually, I’m back up in seconds. Is it because I did twenty rounds before bed?


 Wait… what is this? I can feel Mana Capacity flowing into my balls? I was confused—a new pathway had opened up, allowing me to channel mana directly into my testicles. Can I use Physical Reinforcement on my manhood?


 I tried flowing the mana. I felt a sensation of something accumulating.


 ”Whoa!”


 Junior shot back to life instantly. I felt a wave of lust so intense I wanted to tear Sheena apart. So, if I pump in mana, it generates semen? Is this another Rank-Up effect? Does this mean as long as I have mana, I can go as many rounds as I want?


 It used about half the mana of a standard reinforcement spell. At C-rank, I had enough for 50 spells… so 100 rounds?! I’m C+ now, so it’s definitely more. If I chug a Mana Potion, I could hit 200. Not that I have enough partners for that. Even the whole Harem couldn’t take that much.


 So this is the power of an Incubus. Now I get why Freya said I’d be fine even if I got hit with aphrodisiac magic. With this kind of stamina, I’m basically a biological stud for the Succubus management. It’s a little scary, actually… I’d rather keep my sanity while doing this.


 ”Master?”


 ”Ah, sorry. I’m coming in.”


 I shook off the thoughts of my new ability and moved behind her. I could test the limits later. Right now, I had a rabbit to satisfy.


 ”AAAAHHH! It’s so deep! You’re gouging me out!”


 I spent the rest of the night boring into Sheena’s p**sy until the sun came up.



* * *


 Dungeon Core Room


 ”DAAAAH! DAMMIT! Another 10-pull and nothing! Wait, I’m out of stones?! Top up! Buy more! Hey, what do you mean I hit my daily limit?! Hey, Gazer! You hear me? Tell No. 2 to go buy more gift cards!”


 Tch! I was only 20 pulls away from the Tenjō² for the limited UR weapon! It takes forever for those charmed humans to go out and buy physical cards. It’s so much faster with a credit card. Next time, I need to make sure they kidnap someone with a higher credit limit.


 ”Manager… are you playing those social games again?” one of the staff asked.


 ”I heard the guy No. 1 was using went totally bankrupt. No. 2 is gonna be broke soon too, you know.”


 ”Seriously. It’s getting harder to snatch new guys with all those Earth soldiers on the surface.”


 ”Was it Earth? The mana is so thin there that the Shadow Wolves we send out are basically disposable. We’re already burning resources changing the Dungeon specs; don’t waste high-rank monsters on your hobby.”


 ”She’s right, Manager. If The Queen finds out you’ve been retooling the Dungeon based on game mechanics, you’re toast.”


 I sat with my feet on the desk, lighting a cigarette as five of my staff nagged me in unison.


 ”Shut it! If I didn’t have games, I’d die of boredom in this job! And don’t talk to me while you’re sitting there eating snacks and playing cards in front of the monitors!”


 These slackers… the Dungeon is built, so they’ve totally checked out. Not one of them is looking at the fifty surveillance screens!


 ”Ahaha, well, there’s nothing to do.”


 ”Think of this as comp time for all that overtime we did during the re-spec.”


 ”That was brutal. Why did we have to play social games just to study gacha mechanics?”


 ”Most stressful project ever.”


 ”Did you see that archer girl yesterday? The one who totally got Bakushi³ on her pulls? Her luck was so bad we were all dying.”


 ”Yeah, we were howling.”


 ”When Remia’s team did the beta test, nobody failed that hard.”


 ”Oh, speaking of—did Remia get promoted?”


 ”Yeah, she pulled a ‘winning’ tester. She got a huge bonus and a rank-up. She’s been treating everyone to drinks.”


 ”Huh, is that so?”


 Remia, huh? I think she’s the one handling that guy in Room 1. Yakumo, was it? I heard she came from a poor family and had it rough. Good for her, I guess.


 As for that Yakumo kid… I’ve been keeping an eye on him. He jumped into the Dungeon without a second thought and already bought a bunch of 1st-rank slaves. His ‘gear’ looked pretty decent too—good rim, looked like he’d be a fun ride.


 I can see why Lanora likes him. I’d love a taste myself, but as a High-Succubus and the Princess’s top aide, I can’t exactly go ‘Wall-Butting.’ Lanora would just lecture me about professionalism again.


 ”That bitch Lanora… She really lucked out, sliding right into that department head spot for Wall-Press.”


 I kicked my feet off the desk and stared at the screen. Here I am, stuck just watching the monitors. I’m so jealous it hurts!


 Come to think of it, Freya was weirdly obsessed with that guy, too. Actually, she had the look of a woman totally in love.


 A Succubus Manager falling for a human, huh? There were a few of them back in the world of Alke. Most of them just ended up accidentally killing the guy mid-act. They’d be left crying and swearing they’d never love again.


 Even the Young Lady… When she was undercover as a merchant in that human town, she was absolutely head over heels for him.


 That was a mess. Of all the people to pick, she had to fall for a human Hero.


 If only that bastard had at least slept with her before he went off to die. Thanks to him, the Young Lady is still a virgin, even after becoming the Queen.


 Part of it is that she can’t stand those fat, arrogant Incubi. But mostly, she just can’t get that guy out of her head.


 Even if it’s gross, I bet if she took about ten thousand loads from the Incubus with the highest Mana Capacity, she’d finally conceive.


 But if she still can’t forget him after a hundred years, we might never see another Queen candidate or King born.


 If the Young Lady’s experiment succeeds and we get a Half-Incubus, it might finally fix the Succubus birthrate crisis.


 I guess I’ll have to put my faith in the testers. Speaking of which… that guy Yakumo. He reminds me of him somehow.


BEEP-BEEP-BEEP-BEEP-BEEP!


 I was just sitting there, thinking about all this while waiting for my top-up card to arrive, when suddenly a buzzer screamed through the Core Room. Every monitor flashed blood-red.


 ”W-what?! What’s happening?!”


 I demanded an answer from the staffer closest to the screens.


 ”S-sir! It’s a Rare-Pole Alert!”


 ”What?! Where? Which room?!”


 A Rare-Pole Alert. The alarm that triggers when a legendary c**k shows up in the Dungeon. I’m not talking about just some “huge” one. It’s a specialized trigger the Young Lady set to go off only when her Succubus Factor awakens and a p**is actually mutates.


 It meant her experiment was a success.


 ”Wait! Uh, we have a hit in Room 1!” the staffer said. “Eh? P-Pattern: Spiral! It’s King-class!”


 ”What the hell?! T-the texture?! The length?! Is it actually spinning?!”


 ”Uh! No ridges! Length is roughly eighteen centimeters! No horizontal rotation confirmed!”


 ”I see… so it’s just a sub-par Quasi-King-class.”


 Now that I knew it was only Quasi-King, I forced myself to calm down and sat back in my chair.


 ”He’s currently mid-penetration with a Rabbit Beastman,” the staffer replied. “Should I put it on the main screen?”


 ”Yeah. Do it.”


 In an instant, the man named Yakumo appeared in a full-screen close-up, working over a Rabbit Beastman on a sofa.


 ”It’s definitely a spiral type.”


 A black, glistening, corkscrew-shaped c**k. But compared to the Incubus King’s spiral, “sub-par” was exactly the right word for it.


 I tapped the Magic Crystal to pull up Yakumo’s stats. Rank C+, huh?


 He did this in just over a hundred days? Even for a solo player, that’s fast—but he’s doing it while training slaves and summons. Incredible.


 Based on the other testers, I thought Earth’s humans had lower Mana Capacity than the ones in Alke. I figured C-rank would be the ceiling for most of them.


 I get it now. No wonder Lanora and Freya-sama are so interested in him. This Yakumo guy… his compatibility with demonic energy must be through the roof.


 He really is like that Hero. That guy had a freakish affinity for magic, too. A-rank, if I remember right.


 The Young Lady and I were the same rank back then.


 If he’d only realized we were Succubus Managers in human form, he could’ve at least given the Young Lady a night to remember before he checked out.


 ”Let’s meet in the next life,” my ass.


 Acting like some suave prick and then dying in a mutual kill with the Demon General. A hundred years. It’s been a hundred years, and the Young Lady is still guarding her virginity, waiting for the off-chance she’ll run into your reincarnated self.


 The only reason she even started researching the Succubus Factor was to find a way to turn you into an Incubus.


 Well, at least that research might save our race from extinction now.


 ”Alright! Crank up the difficulty from the 16th Stratum onwards!” I said. “I want him at his limit. We’re going to farm that rank and evolve that spiral c**k to the max!”


 ”Yes, sir! We’re going for a Completed Spiral form!”


 ”Exactly. If he dies, he dies. Just bump the difficulty for Yakumo’s party.”


 He’s the only one far enough ahead for it anyway. Raising his encounter rate won’t mess with anything else.


 In exchange, I’ll swap his drops for those new Magic Stones we just finished developing. One of the women in his group had a Magic Gun, right?


 Worst case, if he dies, we can handle it. The Young Lady will understand.


 I need to know if he’s really got the makings of a King. I need to know if he’s the one who can finally break through the Young Lady’s Orichalcum hymen.


 ”Even if it’s a knock-off, that spiral looks like it feels amazing…”


 ”Look at that Rabbit Beastman’s face… she’s absolutely loving it.”


 My subordinates were glued to the screen, staring at the s*x scene while grinding their thighs together.


 It did look good. Dammit! Now I’m really jealous of Lanora!


 ”Ugh, I should’ve applied for that Wall-Butt recruitment too…”


 ”I’m so jealous of Lilith and the girls!”


 ”Give it a rest,” I said. “You’re all over fifty. You wouldn’t have been hired anyway.”


 ”Urgh! You little… and after I played with Lilith so much when she was a kid!”


 ”Weren’t you the one who got the shit kicked out of you by student-age Lilith?” another staffer asked.


 ”I-I was holding back!?”


 ”Please, you’ve been running from her ever since.”


 ”Guess she’s traumatized.”


 ”She’s a beast, that one.”


 ”Well, she is the granddaughter of the Hero of the Great War.”


 ”Lilith’s grandmother was a powerhouse,” I said. “She died with a smile on her face just so the Young Lady could escape.”


 She was just a regular Succubus Manager, but she was a woman I truly respected.


 I can still see her—laughing, no matter how many times she got cut down. I was only about twenty back then. She was the Succubus hero who taught me what it meant to be a soldier.


 That’s why I kept her away from the military—her daughter and Lilith both. Out of respect for her final wish.


 They’re both terrifyingly strong, so it’s a bit of a waste, but still.


* * *


 Report to the Queen


 Well, time to go report to the Young Lady.


 A Spiral Pole is a big deal. She’s a frustrated virgin who spends all her time on territory management, trade, and gold, but even she’s got to be a little curious about this.


 I grabbed the Magic Crystal containing the recording and stepped onto the teleportation circle, heading for the Consular Castle.


 —


 Summary:


 Yakumo tests his newly evolved ‘Drill-Cock’ ability with his first concubine, Sheena, discovering that the physical changes significantly amplify pleasure for both parties. During the encounter, he realizes that he can now channel mana into his reproductive system to instantly regenerate stamina and semen, effectively allowing for hundreds of consecutive rounds. The scene then shifts to the Dungeon Core Room, where the High-Succubus Emma is raging over a failed gacha session in a mobile game. Her staff criticizes her for using dungeon resources to kidnap humans for their money to fund her gaming addiction. They discuss the recent success of Remia, who was promoted after monitoring Yakumo’s progress. Emma expresses interest in Yakumo’s physical traits but notes that her high-ranking position prevents her from engaging with him directly.


 An administrator monitors dungeon activity and laments the Young Lady’s unrequited 100-year love for a deceased human hero. A sudden ‘Rare-Pole Alert’ triggers, signaling that a tester named Yakumo has successfully mutated a ‘Spiral’ type p**is through the Succubus Factor. The administrator observes Yakumo’s progress via monitor, noting his unusually fast growth and similarity to the former hero. Seeking to verify his potential, the admin decides to artificially increase the difficulty of Yakumo’s dungeon path to force further evolution. The staff engages in crude banter while watching the footage, revealing generational divides and deep-seated traumas involving a character named Lilith. Finally, the narrator prepares to present this breakthrough to the Queen, hoping it sparks her interest despite her frozen romantic life.


 —


 Trivia:


 - The ‘Mana to Semen’ conversion confirms Yakumo is becoming the ultimate ‘stud’ for the Succubus race, which may lead to him being targeted by higher-ranking demons.

 - Emma’s addiction to ‘Earth’ social games suggests a strange cultural bleed between the modern world and the dungeon dimension.

 - The mention of Earth soldiers on the surface indicates a rising conflict between the human world and the dungeon forces.

 - The ‘Succubus Factor’ experiment hints at a desperate attempt to sustain a dying race through hybridization.

 - Yakumo being from ‘Chikyuu’ (Earth) suggests an isekai setting where Earth humans have untapped potential.

 - The mention of Lilith’s grandmother dying to save the Queen establishes a long-standing loyalty and historical conflict.

 - The ‘Magic Gun’ possessed by Yakumo’s companion indicates a mix of fantasy and technological elements in the dungeon rewards


 —


 Character Insight:


 Yakumo and Sheena’s bond is reinforced through a ‘safety test’ that turns into a marathon session, highlighting her role as his most trusted experiment partner. Meanwhile, the Succubus workplace dynamic reveals that the ‘monsters’ are essentially bored bureaucrats with modern vices.


 The narrator’s loyalty to the Queen is balanced by a pragmatic, almost cynical desire to see her move past her virginity for the sake of the species. The staff banter shows a workplace where personal history and combat prowess dictate social hierarchy, specifically regarding the ‘trauma’ Lilith caused her elders.


 —


 Lore And Worldbuilding Context:


 The ‘Drill-Cock’ is a Rank-Up reward from the Incubus line. High-Succubus management uses human captives as ‘billing cards’ to bypass payment limits in Earth-based mobile games.


 Succubus society is facing a birthrate crisis and relies on ‘Incubi Kings’ for reproduction. Ranks (C+, A) and specific anatomical mutations (Spiral Type) are quantifiable metrics in this world’s system.


 —


 TL Notes:


 The term ‘Dorichin’ was translated as ‘Drill-Cock’ to maintain the aggressive, mechanical nature of the original Japanese portmanteau. Gacha slang like ‘Bakushi’ and ‘Tenjo’ was preserved to maintain the corporate satire tone.


 Localizing ‘Rare-Chin’ to ‘Rare-Pole’ maintains the alarm-system aesthetic while preserving the crude pun. ‘Wall-Butt’ was localized to ‘Wall-Press’ to better reflect the common ‘paizuri’ or wall-pinning fetish tropes associated with the term in this context.



 —


 Glossary:


¹ Meiki: Literally ‘Famous Instrument,’ a trope referring to an exceptionally high-quality female body in an erotic context.

² Tenjō: Literally ‘Ceiling,’ a gacha game mechanic where a rare item is guaranteed after a set number of pulls.

³ ³ Bakushi: Literally ‘Exploding Death,’ slang for spending all currency on a gacha banner and failing to get the target item.

Shousika (少子化): The social phenomenon of a declining birthrate, a major thematic element reflecting modern Japanese demographic concerns.

Orichalcum: A legendary metal from antiquity, often depicted in fiction as the hardest and most indestructible material, here used metaphorically for the Queen’s virginity.


Notes:


• Sheena – Rabbit-kin woman, 165 cm, fluffy tail, narrow waist, wide hips, F/G-cup, white pubic hair, clad in black negligee; former slave and the protagonist’s First Concubine and “Second Wife,” fiercely devoted to him, restoring her ego through unwavering loyalty and testing his new physical limits. Cool, mature, sharp-tongued, cold to the weak, ears twitch when happy; agile, thick-skinned, carrot-loving, wields magic and a Fire Arrow scroll. Sadistic toward Lunaria, once known as the Flash-Step Decapitator of the Nightmare Guild.

• Kyoko – 180 cm tall, slender, curvaceous athletic build with long legs and rocket‑shaped upturned breasts (large pale‑brown areolas, Lust Level S). First‑rank student, silver‑medalist athlete/model, housework slave; high G‑Rank stamina, proactive in the bedroom. Mischievous, teases Yakumo, blushes when roles reverse, constantly gazes at him. Assertive combat skill, clumsy with chores, recently hit a high‑disarray intimacy state.

• Freya – A new ‘Wall-Butt’ succubus with long white hair, a high-class appearance resembling a high school student, and large breasts. She is currently trapped in a wall-style display for slave purchase.

• Remia – A cheerful and mischievous succubus with long purple hair and a massive breasts reaching ‘explosive’ levels. Acts as a guide and explains slave systems. Knows Sanada by reputation. Rank B Mana Capacity. Intelligent and persuasive.

• Yakumo – Sanada Yakumo, a 25-year-old scarred veteran and ex-child soldier, is the pragmatic Guard Captain, Nightmare Guildmaster, and dungeon master who recently ranked up to C+, gaining the ‘Drill-Cock’ ability to convert mana into stamina and semen. His battle-torn face and hardened demeanor mask a strategic mind that leads a harem of students and familiars through the 14th Stratum, manages dungeon resources, Gacha pulls, and oversees the Tester Program (Day 99), all while residing in his modern-styled “My Room.”

• Lanora – The brown-skinned elder sister succubus with white hair.

• Lilith – High-ranking Succubus from prestigious lineage, active 100 years ago—the pink-haired masochist now owning the Soul-less Doll Ranch. Former martial-faction hardliner turned submissive after human male training; often marked with ‘scribbles’ (body writing) on her skin.

• Emma – A High-Succubus and manager of the Test Dungeon Core Room Construction Department. She is a heavy gambler and social game addict who oversees dungeon resource management.


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Edited by Kanaa-senpai.
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