Chapter 685
Chapter 685
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Translator: Ebonarch
Chapter: 685
Chapter Title: Master's Challenge (4)
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A declaration of indomitable spirit and anal depravity.
It's a combination that clashes as badly as an Americano paired with doenjang soup.
Yet Si-woo wilted the moment he heard Rinne's declaration, laced with even the faintest hint of overwhelming pressure.
Was this how a demon king felt, watching a hero bulldoze through every obstacle and barrier, climbing floor after floor?
If things kept going like this, he'd be dragged along helplessly in every scenario—an urgent dread settled in.
It really drove home just how devastating the absence of pleasure could be.
Had Rinne even felt a shred of normal ecstasy, he might have broken her down into a pathetic mess and sent her packing.
But Rinne felt none of that.
She could weather every trial Si-woo threw at her, enduring mere physiological repulsion, discomfort, and a touch of embarrassment.
She was the ultimate invincible boss.
-Slurp! Slurp! Slurp!
Even as Si-woo's tongue writhed and delved into her rear entrance, nothing changed.
"Ngh... Master's ass tastes fucking divine."
"Does it?"
She didn't flinch at his lewd words or sexual harassment.
Her hole merely twitched sporadically around his tongue.
"The way it spasms like you're enjoying it is so damn slutty."
"It's twitching, but it doesn't feel good."
Just like during their standing anal sessions before, Rinne's mind remained as clear as a polished mirror.
"A-alright, then. I'm putting it in."
"Do as you please."
Such attacks were pointless.
No matter how many times he repeated this farce, Rinne's reaction wouldn't budge.
Convinced of that, Si-woo dropped to his knees behind her.
The tatami mat made his knees ache like hell.
-Schlup...!
Her rear, now loosened by his familiar tongue, took him in with surprising ease.
Even after one ejaculation, his unrelenting erection slid right in without issue.
Rinne might not have felt any pleasure, but it was a hole he'd used plenty of times before.
Unlike the early days, when it felt like cramming his foot into ill-fitting shoes, it was well-trained now.
Rinne barely complained of pain anymore.
That said, the tight, chewy elasticity was as potent as ever.
"It used to be so tight, but now it just swallows me right up. I could almost call it my personal sleeve."
"Not wrong. You're the only pervert I've ever let in there."
"Really? So, what's it like allowing your disciple such a perverse act?"
"It turns my stomach."
Without seeing her face, it was hard to tell, but her tone was as serene as reading from a textbook.
Time to crank up the humiliation a notch.
"The Sword Witch of the world, offering her ass to her disciple at night—what a pervert. People would be shocked if they knew."
This time, there was a reaction.
Her rear clenched hard, as if trying to sever his shaft.
Normally, you'd think, Oh, she's embarrassed or She's getting turned on by the naughty imagery.
But not Rinne.
Hadn't he seen it earlier?
According to her anger gauge, this was pure fury.
Her subtle tremors transmitted through their joined flesh.
"Leak a word of this, and I won't forgive you—no matter who you are. And this isn't my preference; it's an experiment for mana amplification."
"Is that so? Too bad... I think a perverted Master like you gets even more excited by it."
"......"
He had to keep pushing.
Before Rinne achieved total detachment and saw through every ploy.
Anger gauge or whatever—now wasn't the time to care.
"Deep down, you love it, right? That's why you make excuses about amplification experiments just to do it with me every day, isn't it?"
"......"
-Clench... Clench... Clench... Clench...
Her rear began reacting so intensely it almost felt excessive.
"The excuse... is spot on..."
"Pardon? Really? You'll admit it outright?"
"...Enough."
Yes—get mad.
Let your rage boil over and shatter the whole charade.
But Rinne endured once more.
"It's shameful, but... I've been making excuses every night because I crave anal pleasure with my disciple."
"......"
Forced out by his prodding, it was a lewd confession that nearly made his cock explode.
He knew it was all bullshit, yet the thrill of the illusion was intoxicating.
-Twitch!
His shaft swelled.
Sensation didn't vanish entirely—Rinne felt it too.
The fact that his lust was being sated by her, no matter what.
Then came a question that tilted Rinne's head in puzzlement.
"One question."
"Ask away."
"Why do you refuse vaginal sex?"
This was it.
From what she'd observed, her disciple Shin Si-woo was a lecher among lechers, unable to resist any hole between a woman's legs.
The entrance for normal intercourse, the one that properly aroused any man's interest—it was right there.
To favor her rear so exclusively, never once touching the front? It was suspicious.
"Ah, well, you see..."
He answered calmly at first, but Rinne's question struck right at the heart.
Yeah—this was the danger.
Rinne wasn't stupid.
She'd sensed the unnaturalness of their ongoing dynamic would catch her eye eventually.
Just as the sudden silence grew awkward, Si-woo blurted out,
"Because it turns me on more."
"I don't understand."
"Sure, conquering both holes has its thrill. But pounding only the ass while leaving that hymen intact? There's something perversely exciting about that too."
"...?"
Rinne demanded more explanation for the incomprehensible answer, but what followed was even more baffling.
"Just groping Master's body at will gets me mentally revved up. It's taboo—forbidden, a betrayal of trust."
"......"
That much she could vaguely grasp.
Though she couldn't fathom what this 'sense of betrayal' was or why it translated to pleasure.
"Master knows how twisted anal is, right?"
"I do."
"Exactly. A proper woman should get normal treatment, but instead, you've only known men through the hole perverts crave. If you can't grasp the depravity in that, oh well."
She still didn't get it.
To Rinne, his so-called betrayal fetish seemed like the mangled corpse of some amorphous mutant creature.
But one thing was crystal clear.
His sticky, perverse desires had long been aimed at her.
He'd been eyeing her with that lewd, obsessive gaze.
"Master's just my personal ass cum dump."
She'd never thought of it that way before.
She'd merely permitted use of one of her body's holes.
Yet based on his vulgar phrasing, she realized it now.
She'd been treated like an object, violated as such.
"......"
Suddenly, a sharp pang stabbed Rinne's chest, furrowing her brow.
Ridiculous.
She'd never truly acted as his master.
Never demanded the respect due a teacher from her disciple.
Shin Si-woo had been nothing more than a stepping stone to strength.
Yet mere skin-on-skin contact a few times, and his words stirred an inexplicable sense of betrayal.
"I at least saw you as my disciple."
As if she'd over-immersed in this master-disciple roleplay.
A betrayal so deep it dragged insincere words from her lips.
Si-woo's movements halted abruptly.
"Ass cum dump" had been a bit extreme, sure.
But he'd never expected a reaction like she'd been genuinely hurt.
Of all people, from Rinne? Those frail words coming from her was the real shock.
"M-Master?"
"......"
Si-woo had two options.
Ignore her subtle reaction and press on with the humiliation until she crumbled on her own.
Or clarify it wasn't true and comfort the possibly wounded Rinne.
Her tone and voice pitch were as steady as ever.
He wasn't even sure if his words had actually hurt her.
Still, after all their history, pushing the degradation casually felt off.
"Whew... Master."
"......"
"You know this is all just roleplay, right? No one's seriously thinking like that."
"Is it?"
"Yeah, yeah. I just prefer the ass; the rest is flavorful setup."
"You're one weird bastard."
Rinne replied in a tone that betrayed no shift in her mood.
Was she over it now?
Or had she even been upset to begin with?
The awkward silence thickened the confusion.
Even Si-woo's fully erect cock softened a bit.
This was awkward.
Like bringing a date to a DVD bang, only to watch some sappy laptop movie and kill the vibe for hooking up.
Maybe it was for the best.
"It's gone a bit soft. Things were heating up too."
"......"
"Should we call it?"
As Si-woo flashed an embarrassed grin, ready to bail on the night,
Rinne flatly refused.
"Don't pull out."
"Sure, if you say so... But in this mood, I doubt the mana amplification will kick in."
"Keep going."
"Alright, fine."
The mood might've turned weird, but Rinne's body hadn't changed.
As he resumed thrusting, savoring the sticky grip and oil-slick fusion,
A strange voice suddenly echoed.
"Ahng. Ahng. Ang. Ahng."
It was Rinne's moan.
Holy shit.
"Haang. Haang."
Like an electronic dictionary's text-to-speech function, it was the stiffest, most robotic moan in existence.