Awakening Intellect and Breaking the Limits of Mana Exhaustion
"Ohhh……! Ahn, haahng……! Nanggun-nim…… you're so deep……♥"
Shlp—! Shluuurp!
Inside the cabin bedroom of the Abyss, the lewd, honeyed moans of two women, their breath driven to its very limit, echoed in layered chorus over the violent sound of flesh slapping against flesh.
Thud-thud-thud-thud—!
The bed frame shook as if it would shatter, and Yushin's massive cock—thick as a grown man's forearm—alternated without mercy between crushing the narrow, scorching depths of Lilith's and Tia's wombs.
"Haaugh…… This one…… is about to come as well, my beloved……! Fuah, puhaaahh……!"
Silver saliva trickled in strings from between Tia's lips as the vampire princess's slender waist was lifted clear off the bed.
Lilith's eyes had rolled back, whites showing, and every time Yushin's cock hammered against the entrance of her womb, she sprayed her clear maiden nectar like a fountain.
Slap! Bam, bam, bam!
Gripping both women's smooth hips firmly in his hands, Yushin buried his cock to the hilt with the overwhelming pistoning of A-rank mana and C-rank strength, as if wringing out his very last drop.
Buurrrrt! Puuuush! Splurt!
The twin torrents of Yushin's hot, thick cum erupted without restraint, flooding deep into the innermost cores of Lilith's and Tia's wombs.
"Hyaaaahhh……!"
"Oooohhhhh……!"
The two women screamed out their climaxes in unison, their entire bodies convulsing like aspen leaves.
Long after the violent ejaculation finally subsided, Lilith's legs gave out completely and she collapsed in a heap, while Tia sprawled across the bed in a lewd spread, utterly unconscious.
From the two women's narrow, well-used cunts, the dense, milky white fluid Yushin had pumped into them overflowed in a steady stream, soaking their thighs and the bed sheets white.

And at that very moment, a welcome system notification burst into his ear.
Congratulations. Through a deep spiritual bond with powerful demon women, your Virility rank is increasing!
Virility: D-rank → C-rank.
Even after pouring every last ounce of his energy into the two women, the moment his Virility rank leapt to C-rank, Yushin's cock grew heavy and rigid once more, veins standing taut as if it had never tired at all.
Catching his breath, Yushin gazed down with warm eyes at his two wives, already fast asleep where they'd collapsed on the bed.
Lilith lay curled up, hugging the blanket tightly to her chest, while Tia still breathed deep and slow, limbs spread wide.
After gently tucking the blanket over them, Yushin stepped out into the yard beyond the bedroom and brought up his status window in the empty air.
Mana, A-rank.
In terms of pure destructive power and magical output alone, he was strong enough to stand shoulder to shoulder with the court archmages of the Arhen Empire.
And yet Yushin's brow was anything but relaxed.
"My Intellect is still stuck at D-rank…… so my total mana capacity is just too small."
Yushin clicked his tongue softly as he studied the status window.
His engine's power and output were supercar-grade, but his fuel tank and fuel efficiency were compact-car-grade.
It was a fatal imbalance: whenever he unleashed the powerful spells of his S-rank Reversion array in rapid succession, his mana drained to nothing in an instant.
His build was practically begging for someone to say of him, "Devastating burst damage, but absolutely no staying power in a prolonged fight."
Just as Yushin was seriously mulling over how to raise his Intellect, the system sprite Yurang-i delivered a crystal-clear answer, as if she'd been waiting for exactly this moment.
If you completely deplete the mana within your body and reach the state of Mana Exhaustion, the process of regenerating and recovering your emptied mana circuits will permanently expand your soul's maximum mana capacity.
This directly translates into a dramatic rise in your Intellect stat.
Yushin stared blankly at the text hanging in the air.
"……To sum that up: wring my mana out down to the very last drop, empty myself completely, and then refill."
Precisely correct. In particular, the Abyss itself is an erosive environment that continuously gnaws away at an outsider's mana, which maximizes the strain placed on your circuits during recovery—making this the most perfectly optimized training ground for raising Intellect.
A dry laugh escaped Yushin at Yurang-i's explanation.
The horrifying memory of his first step into the Abyss—his mana-less body having its energies forcibly torn out, blood spurting from his lips.
This Abyss was a brutal wasteland that devoured mana, and at the same time, the cruelest and most efficient training ground imaginable for blowing a vessel's capacity wide open.
"Good…… I picked an amazing practice range after all."
Yushin sat cross-legged in the middle of the yard and drew a deep breath.
What he needed now was not an elegant, mana-conserving magic circle.
Quite the opposite—he needed an extreme discharge, the crudest and fastest way to squander his mana into the empty air and gut his dantian.
"Haahp……!"
Yushin seized the entire A-rank mana pool in his dantian, hauled it up, and began blasting it into the air with no attribute and no form whatsoever.
Diffusion-type mana release.
Fwoooosh—!
The colossal storm of blue mana erupting from every inch of Yushin's body scattered in all directions through the Abyss's crimson atmosphere like smoke.
The air warped, and the surrounding mana currents surged into violent turbulence.
And before more than a few minutes had passed, the moment came when Yushin's dantian was drained absolutely dry.
"Ugh……! Kuh……!"
It was agony unlike anything he had ever known—the extreme pain of true mana exhaustion.
Nausea surged up as if his guts were turning inside out, and a vicious headache and dizziness slammed into him like a steel hammer to the skull.
Feeling went dead starting from his fingertips, and strength drained from his whole body in one long rush.
His legs buckled like a trembling aspen, and he nearly collapsed to the ground.
His eyelids sank leadenly, and a murderous drowsiness crashed over him—the kind that felt as though he might tumble straight into eternal darkness at any moment.
If you lose consciousness and fall into deep sleep in this state, your soul's mana circuits will collapse and your life will be in extreme danger!
"I know…… dammit……!"
Yushin bit down on his lip hard enough to draw blood.
The briny taste of iron flooding his mouth, the sharp sting of pain.
Using that agony as his anchor, he desperately clung to the fraying thread of his consciousness.
If I fall asleep now…… it's over, right then and there!
Gripping one of the cabin's wooden pillars as if he would snap it in two, Yushin forced his body upright.
The edges of his vision darkened like spilled ink bleeding outward, but through gritted teeth, Yushin flung his dantian wide open.
An enormous mana pool, utterly emptied.
And from the very bottom of that void, the Abyss's demonic energy pierced through Yushin's skin, settling calmly into place and beginning to weave a fresh skein of new mana.
Ssssssshh.
Like a long-awaited rain seeping into a paddock cracked dry by drought, a clear, deep energy filled the hollowed-out circuits from within.
His heartbeat slowly found its rhythm again, and his clouded vision blazed bright and clear.
"……I did it."
Yushin clenched his fist, then slowly opened it, exhaling a long breath of admiration.
His mind felt as clear as if someone had dumped ice water over his head, and the flow of mana pooling in his dantian was being controlled with a precision and weight beyond any comparison to before.
His firepower remained at A-rank while his fuel efficiency and total mana capacity had leapt more than twofold—a flawless balance.
As Yushin idly tested his new control over his mana, quiet, gentle footsteps sounded behind him.
When he turned around, Tia and Lilith had already woken and were standing there in their robes, worry written across their faces.
"How long have you two been up?"
Tia narrowed her crimson eyes and studied the tips of Yushin's fingers.
"Just woke, my beloved. The mana all around us was fluctuating in a positively dreadful way…… You were pushing yourself through harsh training alone again, weren't you?"
Tears brimming, Lilith ran to Yushin's side and clutched tightly at his sleeve.
"Nanggun-nim…… your face is so pale! You looked like you could barely even breathe, it was terrifying to see……"
Lilith's small hands were trembling.
Tia came to his other side and rested a hand on his shoulder.
"A man's choice—to drive himself to his very limits for the sake of growing stronger—this one will not condemn as wrong. But my beloved, forget this one thing: that you are never alone, for I and Lilith are always at your side."
Lilith nodded and buried her face against Yushin's chest.
"She's right…… I really, really hate it when you carry all the pain by yourself, Nanggun-nim."
The two women's heartfelt love and concern melted warmly through Yushin's chest in the cold night air.
Yushin chuckled softly and stroked both their heads with tender affection.
"All right. That's enough for today—I'll rest properly."
A gentle smile spread across Tia's lips, and Lilith let out a sigh of relief as she hung onto Yushin's arm.
"Then tonight you have to sleep nice and deep, right between me and big sister Tia in bed!"
In the darkness of the Abyss, cradled in the warm embrace of his two wives, Yushin sank into deep repose, feeling the power of his soul grown stronger yet again.