"I was planning to wring it out just with my chest, but you went and used my mouth."
The Demon King wore a displeased expression. Her adorable look made me chuckle despite myself.
"So, my son. Feeling a bit better now?"
"Huh?"
"I can't read your mind, but your face has smoothed out somewhat."
"Oh."
It seemed my expression had been pretty awful. Even if it was the same as usual, she probably noticed anyway.
When I first awakened and gained the ability to speak, I asked her why she went to such lengths to revive me.
"Because I fell for you, my child—no, my son. You may have first seen me in this castle, but I've been watching over you for a long time."
At first, I thought she was joking, but gradually, I had no choice but to believe her.
She cherished me that much.
She had spent eighteen years caring for the man she loved. Sometimes I wondered if she knew more about me than I did myself. Unless I was determined to hide it, there was nothing I could keep from her.
After a brief hesitation, I slowly opened my mouth.
"I had a dream."
"A dream?"
"Yeah. A dream of the day I was betrayed."
Only then did she understand my expression.
My original goal was revenge.
But as the price of survival, I'd become a baby, endured multiple awakenings, and waited through long years. Even now, she sometimes worried that I might suddenly leave the Demon King's castle. That anxiety probably made her even more devoted to me.
I knew quite a bit about the Demon King too, if not as much as she did about me.
Sensing her unease, I stroked her head with a smile.
"Don't worry. I still want revenge, but right now, I'm the Demon King's son. I won't just up and leave on my own."
"...That's a relief."
The Demon King let out a sigh of relief.
"But it's about time to make a move."
Her relief was short-lived; she furrowed her brow at my next words.
"Make a move?"
"You said it yourself, right? In two years, when I reach adulthood, you'll make me the next Demon King and launch another invasion of the continent."
"...Yes, that's true."
In truth, those words had been a ploy to keep my revenge-driven self from leaving alone.
In the past, she had cried out for continental conquest out of ambition and duty as the Demon King. But now, she was just a woman in love. She prioritized her son and lover over any continent.
That wasn't the only problem.
The demon tribes were struggling even more than the continent's anti-demon alliance to recover from the war's damages—and not just because they'd lost.
Demons had long lifespans, but the time to reach adulthood varied with their power. The stronger the power, the shorter the pre-awakening period. On average, it took fifty years to mature. In short, they lacked manpower that could serve as real combat forces.
"I never fight battles I can't win. Whether it's one-on-one or full-scale war."
"Hmm."
"For that, I need more than just power—preparation. I'm planning to destroy the continent from the inside."
"You mean right now...?"
The Demon King's eyes widened.
"Yeah. I'm going to infiltrate the continent."
"That's too dangerous."
Eighteen years had passed since the war ended, but anti-demon sentiment still boiled among humans. Having been reincarnated, I was practically a demon half-breed. Demon traits couldn't be fully hidden with magic.
That was why the Demon Army had never managed to send a proper spy into the continent.
"It's fine. I've been preparing for years. Today's dream was just the trigger."
"...I see."
Sometimes I'd sneak off with subordinates for some scheme, and it turned out it was all for infiltrating the continent.
I explained everything I'd thought of and prepared.
The Demon King listened silently, her eyes growing wider as the story progressed.
There were uncertain parts and some gambles involved. Still, if it succeeded, it would reliably cripple a huge chunk of the continent's power.
Some aspects were a stretch, but the lovestruck Demon King placed infinite trust in me.
'Thorough research and analysis. A plan that even utilizes his own abilities and personality. Probably impossible if it weren't him.'
She was struck anew by how amazing he was.
From raw power to brains, skills, and temperament—nothing was lacking.
As expected of the man she'd fallen for.
"Then do as you wish, my son. But if it gets dangerous, come back immediately. ...I'll be lonely, so send word often."
"Got it. I'll bring a few subordinates anyway."
"That's reassuring. So, when do you depart?"
"Tomorrow."
All preparations were complete. I'd contingency plans for every scenario.
All I needed was a reason to leave the Demon King's castle.
And today, as if pushing me forward, I'd dreamed of the past.
It was more than enough to reignite my thirst for revenge.
"In that case, I guess I won't be putting you to sleep tonight."
The Demon King's expression shifted back to that of a female in heat.
Earlier had been more about soothing her lover's mood than satisfying lust.
But now, it was purely her carnal desire burning.
I felt the same.
"Mmm, slurp, smack..."
I grabbed the back of her neck and pulled her in for a fierce kiss.
I might lose to her adult body in stamina, but my youthful one outdid her in raw lust. Two rounds wouldn't quench it.
"Slurp... Pwah. I came in your mouth just now—is that okay?"
"Why ask when you know? Of course I used magic."
Even if it was my lover's mouth, no man wants to taste his own semen fresh.
So I rinsed her mouth with a simple spell before kissing her.
"Heh, your magic has really improved."
"It's fun once you learn it properly after sneaking around."
I'd picked up some magic as the Hero, but started too late to master it. Plus, I had to watch my party members, and war left no time for broad study.
My swordsmanship was already top-tier on the continent.
To grow stronger, I chose magic.
The world of magic was deeper and more varied than swordsmanship. Hundreds of spells, plus techniques within each category. Having learned only three before, its endless depths were intoxicating.
"Fluid Magic must've been tricky."
"How could I claim to be the next Demon King without mastering this?"
Her sly grin drew a chuckle from the Demon King.
"Haha, that's reassuring."
"More importantly, that's not what matters now, right?"
I tilted my head down and nipped her nape.
"Ahh♡"
She let out a cute moan in surprise.
I licked and sucked her ears and neck, sticking to her like glue. My smaller frame made it look like a child throwing a tantrum, but it was pure seduction to arouse the female.
Her body quivered with each rustle. My hand slid down to her panties—black silk that screamed luxury, already soaked.
The cause was obvious.
The Demon King's arousal fluids.
Her pussy was gushing nonstop.
"Haa, ngh, hngh."
I slipped my hand inside. Parting her neatly trimmed bush, I teased her hypersensitive clit.
"Nngh...♥"
The Demon King trembled, savoring the pleasure with her whole body.
Her arms wrapped around my back; my tongue now sucked her nipple. Every move stimulated her intensely.
Skilled fingers.
I knew her body too well. I'd spent over a century as the Demon King developing it as a woman's.
"Haa, haaah."
Her heated breaths spilled out.
My insistent fingers delved into her depths.
"Heek!"
Electric signals raced up her spine; she climaxed lightly.
Twitch, twitch.
"Haa, haa..."
The Demon King buried her face in the smaller boy's shoulder, writhing.
"My son... that was more intense than usual, haa."
"Is the naughty boy mad and needs punishment?"
"Ngh."
She knew exactly what I meant—a callback to her paizuri taunt.
"If my son wants that play, I won't refuse, but right now, I want to be your lover, not your mother."
"Huh?"
Playing it like that, huh.
Making it sound like my idea—cute, but cheeky too.
"Plotting against me...? You need a real punishment."
"Hey, shut up!"
Not dodging, but truly craving lover's sex, the Demon King sealed my lips. Her thick, flavorful tongue invaded.
Her lips tasted of loneliness. A kiss to memorize her lover's taste before long parting, imprinting his scent on her body.
Realizing that, I let her lead silently.
In an instant, her hands stripped my top and her panties. Now naked, we embraced. Our mingled body heat fueled the fire.
"Ahh, haa."
"Aren't you too worked up?"
"How could I hold back with my son being so lewd?"
Her panting was near hyperventilation. Her words made me laugh—shouldn't I be saying that?
"Don't laugh, my son."
"Ah, sorry, really."
Even trying to stay serious, her loveliness cracked me up. Maybe becoming the Hero was all to meet her. Such thoughts crossed my mind.
Days of incomparable human happiness.
"Meeting you was my greatest stroke of luck."
"Not just that—it is luck. ...And the same for me."
Embracing, we smiled in unison.
Our lips met. At first, a tender rub of lips. Soon, we devoured each other like beasts.
It took little time for the pair to become feral, locked in passionate kisses.
"Mmm..., chup, haa, slurp..., chuup...♥"
As if betting how long they could last on lips alone, they refused to part. The loser? The Demon King.
Eyes half-lidded, she shoved her son onto the bed and straddled him.
"Oof!"
"Haa, haa, ...haaah♥"
Her belly pressed against the hot rod. She ground against the scorching pillar like it might burn her.
"So hot... haa."
The Demon King lifted slightly, rubbing the glans into her navel.
"Nngh..., hngh, ...haa."
An odd sensation. Too big to fully enter, but the pressure on her belly defied words. Each press teased her womb and bladder inside.
Not typically pleasurable, but she was a demon.
Long-lived races shared low pregnancy rates. Demons evolved differently to boost birthrates.
Their bodies hypersensitized during arousal, including some organs. Womb, bladder— all erogenous.
Demon bodies were optimized for sex.
"What a perverted body."
I grabbed her lower breasts.
"Ngh, aren't you the one who made me this way?"
Among such bodies, hers was elite. Developed by me, it rivaled any succubus.
"You'll pay for creating this body!"
I thrust harder into her navel, biting a handful of breast.
"Haaah—!!"
Tormented to the brink, her bladder squirted.
Splurt! Splurt!
Not urine, but close—her fluids gushed as she shuddered in ecstasy.
"Haa, haa, haaah...."
"Cumming easier than usual today?"
"W-what are you saying."
Regaining composure, she lifted her hips. One hand gripped my shoulder; the other spread her mound, exposing her hole.
Target: one place.
The throbbing man's cock.
"Now the real fun begins."\
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