Joining the Demon Army Changed My Life

Being a fugitive wasn't exactly pleasant.

Whether eating or trying to sleep, I kept finding myself hyperaware of my surroundings.

"Damn it, why the hell did it come to this!"

Still, I had once been a hero who strove to save the world. I couldn't bear this treatment any longer. Even if it was fucking pointless, I needed to vent my anger somehow.

Thud. Thud.

Despite my resolve, days spent fleeing had conditioned me to hide at the slightest sound of footsteps.

'Who is it now?'

Almost no one would come all the way to this rural millhouse.

At most, it might be the mill's owner—though he'd already been bribed into silence.

'Demon energy?'

What I sensed was unmistakably demonic energy. That meant a demon had come.

Or perhaps someone who'd sworn allegiance to the demons. Either way, as a former hero, this was an uncomfortable encounter no matter how you looked at it.

'Should I kill them?'

Anyone carrying demon energy couldn't be good, so killing them was always an option.

I quietly rested my hand on my sword.

"Hero Kim Jin-woo."

"Who's there?"

They already knew my identity. No point in hiding now.

"So you were here after all, Hero."

Only then did I recognize who stood before me.

A woman dressed in outrageously revealing clothes—a top that barely covered her upper chest with deep side slits, wearing only the tiniest of panties. This was Reina, the Succubus Queen, one of the Four Heavenly Kings of the Demon Army. In the past, I would've cut her down in one stroke for being a demon, but now my feelings had changed somewhat. Damn, look at those tits.

Her massive chest and ample hips made me understand why the Succubus Queen had gotten the game I was reincarnated into slapped with a 15+ rating. "Did you come to avenge your fallen comrades? If that's the case—"

"No, I'm here to deliver the Demon King's message. Think of me as just a messenger."

"The Demon King? He has something to say to me?"

The Succubus Queen smirked as she stepped closer. "After the Hero Party disbanded, things must've been rough for you, no?"

"Did you come all this way just to mock me?"

I was about to swing my sword in anger when—"Of course not. The Demon King holds you, a former hero, in very high regard. I'm also here to ask if you'd consider joining the Demon Army."

The Demon Army? "You want me in the Demon Army?"

"Exactly. Given how much trouble you caused us, there's no doubt about your abilities. And since the humans cast you out themselves, you've got plenty of justification, don't you? So, what do you say? Will you come with me?"

"What can the Demon Army offer me?"

"Anything you desire. Ask for half the world, and it's yours. Demand the title of Grand General of the Demon Army, and it's yours. Want as many beauties of the demon realm as you please? Done. If you want me, that's also on the table."

Bullshit negotiations—no, there wasn't even a need to think deeply about it. Living like this, branded as the culprit behind the Hero Party's downfall—

OR

Joining the Demon Army and rising to glory. Obviously, the latter, goddammit. "Let's go. Right now."

"...Just like that?"

"Lead the way, Succubus Queen. From this moment on, I am Kim Jin-woo, Grand General of the Demon Army."

The Succubus Queen looked downright baffled. Her reaction was much the same when she opened a portal and returned. "You're back, Succubus Queen! And who's this beside you?"

"He calls himself Kim Jin-woo, prospective Grand General of the Demon Army. Also a former hero."

"...It worked, then?"

"Why wouldn't it?"

I strode past the demons without hesitation, heading straight for the throne where the Demon King sat. Asmodeus—once our enemy, humanity's nemesis. Though now, he was about to become my boss. "Everything the Succubus Queen promised—it's all true, right?"

"It is."

His short reply ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠carried immense authority, befitting his title as Demon King. "A verbal agreement feels a bit flimsy, though. Would you mind signing a scroll in your own hand?"

I immediately summoned a magical scroll. The Oath of Vows—a type of absolute magic that couldn't be broken without mutual consent. Of course, the oath itself also required mutual agreement to take effect. Asmodeus inscribed his name without hesitation. I didn't even wait for a prompt before signing mine. "From this moment on, I am a member of the Demon Army. So, what's first?"

"I'll trust you since we've made a contract, but... you were a hero, weren't you? How could a hero make such a simple choice?"

"That's personal. Should I use honorifics since you're the Demon King?"

"The Demon Army doesn't shackle itself with such formalities. Speak however you're comfortable."

"Fucking perfect."

I didn't forget to butter him up—after all, the Demon King was about to be my superior. "Then, is there anything you'd like me to do? If not, should I start with conquering the human world?"

"...Do as you please."

Asmodeus had little else to say. "Then I'll begin by wrecking the human world."

There were a few people I needed to wreck. I couldn't be sure exactly who the culprit was, but the bitch who spread ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠the rumor about me being impotent was definitely one of the Hero Party members. Since they were all women I'd had bad blood with, it was hard to pinpoint exactly who it was. Well then, I'll just have to hunt them down one by one.

"Perfect timing. I was just planning to conquer the Stein Empire."

"Then it's settled—you'll serve as the Grand General of the Demon Army."

"Sounds good. But... won't there be any issues?"

Even if I was now officially part of the Demon Army, my past as a former Hero couldn't be ignored. The number of demons I'd cut down could fill a truck and then some, so it wouldn't be surprising if they found it uncomfortable to suddenly serve under me.

"Don't worry. Demons respect strength above all. As long as you've got the power, you can do whatever you want."

"Really, whatever I want?"

"Most likely. Though, what exactly are you planning?"

"Hmm... rape? Or maybe murder and extortion?"

"That's pretty standard."

Standard? Well, I guess that's the Demon Army for you. "I like it here already. I'll get going, then."

This marked the historic first day of my life after quitting the damn Hero Party and joining the Demon Army.

***

The quarters I received after becoming part of the Demon Army were luxurious. The bed was plush, the fridge stocked with fine alcohol—it was so lavish that even high-end hotels wouldn't dare compare.

"Welcome, sir."

At the sudden presence, I turned my head to see a woman standing there, her beauty rivaling even the Succubus Queen I'd seen earlier. Her outfit—if you could even call it that—was practically just lingerie, leaving little to the imagination. The intricate markings on her stomach, the bat-like wings on her back, and the tail curling from her lower half made it obvious: she was a succubus.

"What brings you here?"

"I am Ria, a succubus. By the Demon King's command, I am to serve as your attendant."

"Attendant?"

"Yes, that's correct."

Holy shit.

That was my first thought—and even after collecting myself, it was still the only thing on my mind. She was gorgeous, with a perfect figure and ample curves. And she was assigned to be my attendant?

I love the Demon Army! No—long live the Demon King! All hail His Majesty!

"So, what exactly does an attendant do?"

"Various tasks—waiting on you, preparing meals, among other things."

"That's it?"

My interest plummeted. With a body like that, just doing chores felt like a waste.

"Of course, if the Grand General desires... other services are also possible."

"Other services?"

"For example... helping you change clothes, or... other forms of assistance..."

The way her face flushed as she spoke told me I wasn't too far off in my assumptions.

"Good. Then help me change first."

"Right now?"

"Well, I am part of the Demon Army now. ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Shouldn't I dress the part?"

"Understood."

Ria quickly brought over the uniform. The only downside? The Demon Army's fashion sense was atrocious. Whoever designed this must have had an obsession with purple—every inch of it was drenched in the color.

But my dissatisfaction was short-lived. My attention was immediately stolen—by the sight of Ria's chest swaying right in front of me.

Damn...

Her figure was too perfect to resist. Before I knew it, I'd grabbed her wrist.

"You said you assist me, right? Does that include... this?"

Ria's gaze trailed down to where my hand led—to the unmistakable bulge straining against my pants, screaming that it couldn't hold back any longer.

"...It's possible."

Ria's outfit already left little to the imagination, but she discarded the few scraps of fabric that remained. My eyes raked over her body. Her ample breasts looked well beyond an E-cup. Her skin had an exotic hue, and she was impeccably groomed—not a single hair out of place.

"Let me undress you..."

She stepped closer, clad in nothing but her panties, and began stripping me down. The moment she did, her eyes widened.

Her gaze was locked onto my cock.

Thanks to the 50 points I'd invested in my Virility stat, it stood at full attention—thick and unyielding. It was undoubtedly one of the more impressive sizes even within the Demon Army.

"First time with a human?"

Ria nodded.

I immediately cupped her breasts and whispered, "Then let's make this one count."

Firm, yet soft...

It was almost bewildering how these two sensations could coexist. Moreover, they were so enormous that a single hand couldn't possibly contain them. "Your figure is truly exceptional."

"Thank you."

Before I knew it, Ria had begun gently stroking my cock. Being a succubus, her hand skills were nothing to scoff ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠at. But letting her finish me off with just her hands was out of the question—I immediately counterattacked by flicking her ample breasts. After lightly grazing them once, my hand went straight for her lower half. The dampness was so pronounced I could feel my fingers getting wet. Without hesitation, I straightened my fingers and slowly pushed them inside her pussy. "Hnggk!"

After hearing her moan, I gleefully thrust my cock into her. The inside was incredibly tight.