Open Up--!! Demon King--!!! (2)
My name can be whatever now.
A twenty-two-year-old man.
On the night I was standing sentry duty at the guard post in my unit, I ended up making a bet with the buddy on shift with me.
Thud.
"Ah, fuck."
"Hey...?"
Shoving my dick into the gun barrel.
"Ah.. it won't come out.. ugh...!!"
"It really went in?! How micro is your dick?!"
"The author's just draft-dodging so it fits--!! Common sense size would never...!!"
Bang---!!!
And just like that, I died from massive blood loss after the bullet accidentally discharged.

"A warm welcome to the heavenly realm~!"
When I opened my eyes again, an angel who looked like she was about to hand out a cheat ability was standing there.
"Whoa... check out those tits."
"........ Death sentence."
The moment those words left my mouth, I was dropped into another world.
I clearly meant it as a compliment, yet I still cannot figure out why she suddenly lost her shit.
On top of that, just because I brought up her breasts, she turned me into a woman.
Insanely massive tits were now hanging off me, and the dick that should have been blown to pieces by the bullet was gone without a trace.
With that, the dream of conquering a straight harem in another world became impossible... I sank into deep despair.
That despair, however, did not last long.
The ability granted to me was Creation and Application.
"Oh god--!! Ohgogogogogogogok--!!"
Thud...!!!
"Super Resonance Dildo...!! An absolute monster weapon that forces an orgasm no matter where you stick it has been born...!!"
Using this power, I began recreating the weapons that appeared in adult webtoons one by one.
The world came to call me the Hero, and of course I eventually set out for the Demon King's Castle to defeat the Demon King...
Thud--!!
"Never thought I'd get to see the face of the Hero who took down the Four Heavenly Kings."
The moment I stood face-to-face with the Demon King, Firva, I understood.

"Strip for the toys--!!!"
She and I were soulmates.
"There is no way we are soulmates--!!"
"Well, who told you to have a body that gets people that horny?"
Back in the present, the Hero had the Demon King testing adult products day after day.
"Since this is chapter one I spent a fair bit of word count explaining my situation. So without further ado, please test it."
"I refuse..."
Crack. Craaaaack.
That instant, massive fissures began spreading through the Demon King's castle.

"You seem to have forgotten. I played along for a while and now you think of me as your underling..."
Two minutes later.
"I am the underling...!!"
Firva leaked as she collapsed onto the floor, desperately begging the Hero.
"See? If you'd just listened quietly none of this would have happened."
Slap. Slap.
The Hero walked straight toward Firva's lower half.
"W.. what are you trying to do..."
"Gotta insert it. The Ice Sea Cucumber."
"S.. stop it...!! Please, not today...!!"
Swish.
Ignoring Firva's pleas entirely, the Hero yanked her pants down without hesitation.
"Haa... No matter how many times I see it, what a beautiful ass. Is this really the Demon King's backside..."
The Hero marveled as her hand also reached for the red panties.

"Pleeease...?"
Slap.
Something ice-cold pressed against Firva's entrance.
"Hiiik--!!"
"Now it begins~! My dream~! Training for my dream~! Firva~!"
Slurrrrp--!!
A sound that belonged at a ramen table began echoing from between Firva's legs.
"Kyaaaaaaaaaah--!!!"
Firva's entire body convulsed as she freaked out.
"Alright, it's fully sucked in. Now for the contraction and expansion..."
Bwooooooom--!!!
In that instant Firva's abdomen ballooned at terrifying speed.
"Uooooooooh--!!"
Firva clutched her belly, now swollen like a watermelon, and screamed.
"Fucking incredible--!!! I never imagined the expansion would get this huge--!!"
The Hero gushed with admiration while snapping photo after photo of the inflated stomach with her camera.
Click--!! Click--!! Click--!!
"D.. don't take pictures... Uoooooh--!!"
Bwak--!!!
The Ice Sea Cucumber contracted inside Firva's womb in a flash, and her belly snapped back to normal size.
"C.. cold... I.. I have to get it out right now..!!"
Swish. Swish. Swish.
Firva frantically shoved her own fingers into her entrance, desperately trying to dig the sea cucumber free.
"Hehehe... Did you know this, Demon King?"
"W.. what are you talking about--!!"
Firva demanded, face burning with fury and humiliation.
"The only way to remove the Ice Sea Cucumber is to transfer it to someone else!"
"What?!"
"If you press your pussy against another person's pussy, the Ice Sea Cucumber moves on its own..."
Slam--!!
"Eh?"
"You take it toooooo--!!!"
Firva seized the Hero's shoulders and smashed their entrances together.
"W-w-w-wait a second--!!"
Sploosh--!!!
In that split second the Ice Sea Cucumber shot straight into the Hero's crotch.
"Kyaaaaaaaaaah--!! What the hell do you think you're doing?!"
"Kha.. hahahahaha...!! Did you think I'd just keep taking it--!! Now you get to feel exactly what I went through..."
Bwooooooom--!!
"Nngoooooh~~~♡♥︎♡♡♡!!"
That very moment Firva's abdomen swelled up once more.
"W.. why...?"
"Hehehe..."
The Hero wore a meaningful smile as she spread her own entrance.
Slap.
A red sea cucumber and the Ice Sea Cucumber both plopped onto the floor.
"Y.. you idiot..."
The Demon King could only stare in absolute horror at the scene unfolding before her eyes.
"When you have sex you wear a condom, right? Thanks to planting the Fire Sea Cucumber in advance, I expelled both it and the Ice Sea Cucumber together--!!"
"Y.. youuuuu--!! How dare you toy with me...!!"
Bwooooooooom--!!!
"Nngiiiiiiiit--!!"
Firva's sea cucumber contracted yet again.
"P.. please take it out... I'm begging you... Nngoooooh--!!"
Bwooooom--!!
"Well~! If you join the next test I might be willing to remove it!"
The Hero looked down at Firva with a thoroughly malicious smile.
"I get it...!! I get it so please just take it..."
"Then next chapter preview--!! I'll administer the 'It Goes In, You Say?' potion I bought from the mages~!"
"W.. what is that this time...!!"
Bwaaaaaaaaaak--!!!
"Kyo oooooooh--!!!"
The next day.
This place was the Braitry Kingdom.
A gathering spot for countless adventurers.
Right in the middle of the bustling street that linked the royal palace and the adventurer's guild stood a small shop that always had a long line out front.
The Hero's All-Purpose Adult Toy Shop.
No flashy signboard, no grandiose advertising, yet it was the most famous store in the entire kingdom.
Crafted from materials nearly impossible to obtain anywhere in the world, nobles and commoners, adventurers and knights alike all flocked here.
Today was no different.
"Next customer, please come in~!"
The Hero seated at the counter greeted the next guest with a bright smile.
A white-haired old man approached leaning on his cane and bowed repeatedly.
"Hero... thank you so much. I never dreamed in my wildest dreams that this old man's thing would stand again."
The Hero gave an awkward laugh and waved it off.
"Don't mention it. How's the body feeling?"
"Yes! Now I can even jerk off together with my grandson."
"Haha! That's great news! Though I really don't want to see that!"
The old man left with reddened eyes, still pouring out thanks.
Right after him a knight in full armor strode in.
"Hero! Thanks to the aphrodisiac you gave me last time I saved my life!! Because we held an orgy out on the snowfield, every last member of the unit made it back alive."
"Glad to hear it. That's a disgusting story so never bring it up again."
"Understood!"
The knight also bowed deeply and departed.
Even after that the stream of customers never stopped.
"My son's hip work got so much smoother!"
"My husband's semen tastes better now!"
"Our kid's size went past thirty centimeters!!"
"As expected, anything the Hero makes is on another level--!!"
The shop filled with gratitude and laughter.
Quite some time later, when the crowd finally thinned, a young woman dressed as an adventurer carefully raised her hand.
"Um... may I ask something?"
"Yes?"
"With performance this high, the development process must have required enormous amounts of testing..."
The surrounding customers all pricked up their ears.
She was voicing the question everyone had been dying to ask.
"Could it be... that you manufacture and test everything yourself, Hero?"
The shop fell silent in an instant.
Every gaze locked onto the Hero.
She blinked once, then let out a soft snicker.
"Me?"
She shook her head left and right.
"Nope. Making them is me, though!"
"Then...?"
The corner of the Hero's mouth curved upward in a slow, mischievous, thoroughly meaningful smile.
"There's a separate test subject~!"
"...Excuse me?"
"No need to worry."
The Hero skillfully arranged the products while wearing a sweet smile.
"Effects, side effects, duration, taste... I verify every last detail thoroughly."
The customers were impressed.
"As expected of the Hero."
"So there's dedicated test personnel."
"That's why the quality is this high."
"I kind of want to apply myself?"
Some assumed she received support from the kingdom's research institute. Others figured the royal knight order helped with the trials.
But the Hero never bothered to clear up that misunderstanding.
"Hehe..."
She simply swallowed her laughter on the inside.
At that same moment, thousands of miles away from the Braitry Kingdom, inside the Demon King's Castle.
Demon King Firva, clad in a black dress, stared down at the mountain of wooden boxes piled before her.
Every single box bore the same message.
It's a new product. Please be sure to drink it and leave a review! — From the Hero
Firva sighed as if thoroughly used to this routine.
"What did you make this time..."
She picked up one of the bottles.
A gaudy rainbow liquid sparkled in a thoroughly unpleasant way.
After a brief hesitation she finally twisted the cap open.
"Please... just let tomorrow be the end..."
Gulp.
No one knew of that scene.
That the dedicated test subject who personally verified every effect so that the finest adult toys of the Braitry Kingdom could be born was none other than the Demon King herself.