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Chapter 17: Making the Underworld Tremble; Manipulating Fate
🕑 Added 2025-03-31 16:40:22 +0000 UTC“That lad, Yamamoto Tatsuya was it? What's his background?”
The Familiar Master watched the siblings leave and turned to Rias. There was something in his eyes that made Rias uncomfortable.
“He's a human born with great strength and Immortality stronger than the Phenex.” Rias didn't bother hiding much.
Tatsuya's fame in the Underworld had already begun to foster. With the millions of online spectators and his clips that would begin circulating in the DevilNet, no Devil would not know of him in the future.
“Human born?” The Familiar Master narrowed his eyes in suspicion but he didn't say anything else. It wasn't his place to meddle in other people's matters.
Ten minutes passed in silence before Ichika walked back outside.
“You're back!” Rias and her peerage excitedly surrounded her.
The reason being the salamander-like lizard in her hands. It yawned while breathing out hints of flame.
“It's quite cute.” Akeno patted the head of the lizard as Rias nodded. Koneko's eyes glittered as she looked at the lizard.
“Hehe, I wonder what kind of Familiar Onii-chan will choose.” Ichika rubbed her head bashfully as she shifted the topic to Tatsuya.
“If he finds the Nine-Headed Hydra it shouldn't be a problem for him to subdue it.”
The group discussed excitedly.
…
An hour passed.
An hour.
This wasn't normal.
Rias looked towards the Familiar Master who shrugged, “I can't really tell what your friend is doing inside the forest but if he was fighting or subduing any creature we should've felt the magical fluctuations by now.”
Rias was concerned but not too worried.
Tatsuya's Immortality was quite literally broken. His Immortality was not like the Phenex where it stopped once his Demonic Energy was depleted, instead, it seemed endless and infinite.
Otherwise, his Demonic Energy which barely touched the ceiling of a Low-Class Devil wouldn't have lasted considering the damage he took.
As they continued to wait the silhouettes of two people became vaguely clear, walking towards them.
The group was stunned as Tatsuya emerged from the forest with a stunning blue-haired woman. Her features were so gorgeous that it caused even Rias and her to blush for a moment.
But after admiration confusion settled in.
“Who's this Yamamoto…?” Rias asked, her voice a bit miffed. Since her attention had been on the both of them she didn't see the trembling figure of the Familiar Master who was quietly slipping away.
Tiamat glanced at him for a brief second before ignoring him.
She looked at the Princess of Gremory who was staring at her with a hint of hostility.
Has Lord Chaos already charmed this little girl? She couldn't help but sneer inwardly while pitying their fate.
“It's my Familiar. The Chaos Karma Dragon, Tiamat.” Tatsuya spoke casually as if his words hadn't caused the Rias and the rest to freeze on the spot.
“T-The Chaos Karma Dragon!?” Rias stuttered, unable to believe it.
Why had the Strongest Dragon King become a Familiar to her peerage member?
This made no sense!
Koneko, who was a cat yokai, trembled beneath the gaze of Tiamat. It was as if she was going to be swallowed whole.
“Tiamat.” Tatsuya's voice cut in sharply as he noticed the growing tension in the air.
“Yes, Master.” Tiamat took a step back and crossed her hands in front of her like a maid.
If Tiamat becoming Tatsuya's familiar was shocking then the current scene in front of her made Rias almost faint from shock. She seemed to be in a daze.
She looked at the incredibly beautiful woman standing behind him obediently like a slave, like a servant willing to obey any command her Master throws at her.
A faint sense of danger enveloped Rias’ heart as she did her best to compose herself.
“We… It's time we leave and report our Familiars to the Head of the Family.”
Actually, there was no need for any such step but the family had to be informed immediately.
Just as Rias unfurled her wings Tatsuya placed a hand on her shoulder, stopping her.
Rias was confused but her lips twitched as she saw Tatsuya's lips move in the direction of the Chaos Karma Dragon.
She nodded and jumped back.
Tiamat’s human form began to ripple, her porcelain skin shimmering with an otherworldly glow
A cascade of azure and golden scales erupted from her flesh, each one glinting like polished gemstones, overlapping in intricate patterns that pulsed with raw, chaotic energy.
Her arms stretched and twisted, bones cracking and reforming into massive, sinewy claws tipped with talons sharp enough to rend steel.
From her back, colossal wings unfurled with a sound like thunder, each membrane a mix of deep blue streaked with veins of molten gold, their span so vast they cast a shadow over the entire clearing, the tips crackling with uncontrollable frost.
Her legs thickened, muscles coiling beneath scales as they morphed into powerful hind limbs, each step she took reverberating through the ground like a drumbeat of war.
Her neck elongated, serpentine and graceful, crowned with a head that split into a maw of jagged, obsidian-black fangs, her eyes glowing a fierce crimson that pierced through the dim light of the Underworld forest.
Horns spiraled upward from her skull.
Her tail lashed out behind her, long and whip-like, adorned with spines that glowed with a faint, ominous light, the air hissing as it sliced through it.
“Get on,” Tatsuya said calmly, his voice cutting through the stunned silence as he stepped onto the ridge of Tiamat’s back, his boots finding purchase between two massive scales.
Rias blinked, her crimson hair fluttering in the breeze kicked up by Tiamat’s transformation before she shook off her shock and climbed up, her hands gripping a protruding spine as she hauled herself onto the Dragon’s back.
Akeno followed, her usual playful smirk replaced by wide-eyed wonder as she settled behind Rias, her fingers brushing against the warm, pulsating scales that felt alive beneath her touch.
Koneko hesitated, her golden eyes flickering with instinctual fear, but Ichika tugged her along, the salamander Familiar in her arms chirping as they clambered up together.
Kiba moved with grace, his sword clinking against his side as he found a spot near Tatsuya.
Tiamat shifted, her muscles rippling beneath her scales as she adjusted to the weight of her passengers, her crimson eyes glancing back at Tatsuya with a flicker of amusement.
With a deafening roar that shook the trees and sent birds scattering from the forest canopy, she beat her wings once, the force flattening the grass below as she launched into the crimson sky.
The wind howled around them, a blend of sound and fury as Tiamat soared higher, her wings cutting through the air with a rhythmic, thunderous beat.
Rias’s grip tightened on the spine, her knuckles whitening as the Underworld blurred beneath them.
Akeno let out a nervous laugh, her voice nearly lost in the gale, while Koneko buried her face in Ichika’s shoulder, the salamander Familiar puffing tiny flames that flickered out instantly in the wind.
Kiba stood on top of the dragon trying to admire the view from above. He looked at Tatsuya at the front and couldn't help but admit his elegance.
He's really cool…
Tatsuya stood at the forefront with his hands linked behind his back, his dark hair whipping wildly, his expression serene as if he were merely riding a horse rather than the mightiest Dragon King.
Below, Devils in sprawling cities and desolate villages craned their necks upward, their eyes widening in disbelief as Tiamat’s silhouette dominated the sky.
Her scales caught the eerie red light of the Underworld’s artificial Sun, refracting it into a dazzling display of red and gold that painted the horizon like a living aurora.
Her wings left trails of faint, chaotic energy in their wake, shimmering wisps that dissipated into the air leaving behind hints of frost.
The Gremory Family Estate loomed ahead and Tiamat tilted her wings, beginning a grand, spiraling descent that made Rias’s stomach lurch, her hair tangling into a wild mess as the ground rushed closer.
Her claws grazed the earth as she landed, the impact sending a tremor through the estate, windows rattling and servants stumbling as they rushed outside to see the source.
The servants froze as they laid eyes on the Chaos Karma Dragon and the human who rode her.
…
The Sitri mansion.
Serafall Leviathan was sprawled across a velvet chaise, idly swiping through her magical tablet looking for something interesting to read on the DevilNet but alas all she saw were threads and discussions about Tatsuya.
She moaned in grievance, feeling desolate that Magical Girls couldn't become as popular as Tatsuya became in a day even in decades.
Wait… what if I make Yama-chan become a Magical Girl? Won't everyone start admiring and talking about Magical Girls then!?
Just as she was scheming inwardly a bone-rattling roar shook the chandeliers.
She yelped, tumbling off the seat, her twin tails flailing as she dashed to the window—only to freeze as Tiamat’s colossal form ripped through the crimson sky, scales blazing blue and gold.
“T-Tiamat-chan?! No way!” she squealed, then her eyes bugged out further, spotting Tatsuya atop her, Rias and her peerage clinging behind him. “Wait, wait, wait—that’s Yama-chan!? Riding Tiamat?!”
Her voice hit a pitch that could shatter glass, a mix of giddy excitement and creeping dread as she imagined the chaos this would unleash.
“So-tan! So-tan!” She dashed excitedly, trying to find her sister.
Down in Lucifaad’s bustling plaza, Sirzechs Lucifer stood beside Grayfia, his usual playful demeanor sobered by duty, until the crowd’s panicked shouts snapped his head skyward.
“Woah…”
“Beautiful…”
“Look! Oh my go— ouch.”
Tiamat thundered overhead, her wings leaving a trail of ice behind her, and there—there—was Tatsuya, the human-turned-Devil whose immortality outshone even the Phenex clan, sitting astride her like some warlord of old, Rias and her peerage dwarfed in his shadow.
Sirzechs’s crimson eyes widened, a chill running down his spine despite his calm facade. “Tatsuya… with the Chaos Karma Dragon as his steed?” he murmured, voice low with wary awe.
Grayfia’s eyes widened in shock before her silver gaze sharpened as she whispered, “This is too suspicious… Was it really right to let him join Rias-sama’s peerage?”
Sirzechs remained silent. His figure vanishing with Grayfia following behind.
Devil work, Satan duties, Soul Reaper… nothing mattered right now.
…
At the Phenex estate, surrounded by molten pools, Riser Phenex was mid-tirade—snarling about some imagined insult—when Tiamat’s earth-shaking roar drowned him out, her silhouette blazing across the sky.
He staggered to the balcony, wine glass shattering in his grip as he saw Tatsuya, the Undying Immortal Devil, now infamous for tanking blows that’d kill a High-Class Devil ten times over, riding the Chaos Karma Dragon like it was nothing.
“That filthy monk- cough him?!” Riser bellowed, flames flaring wildly around him, his bravado masking the cold sweat on his brow. Ravel peeked from the doorway, her usual haughtiness gone, voice trembling, “Tiamat!? W-We can’t fight that… Onii-sama your revenge…”
Riser sharply looked at her, “What revenge? Don't talk nonsense or I'll throw you out of my peerage. Our fight was full of elegance and manners, my defeat is not something to weep tears of sorrow over.”
“???”
Ravel looked at him completely baffled as he strode away in a proud manner.
…
In the Bael clan’s rugged training grounds, Sairaorg Bael paused mid-punch, his knuckles bleeding from a spar, as Tiamat’s shadow swept over him.
He turned, chest heaving, and saw her descend toward the Gremory Estate, Tatsuya’s unmistakable figure atop her—Tatsuya the Undying, the human who humiliated the entirety of Pure-Blooded Devils now displaying his dominance through taming Tiamat.
To see an ageless dragon that remained free since birth become a Familiar to a newly Reincarnated Devil…
“The Old Devils… hah!”
His grin faltered into a tense grimace, fists clenching with excitement, “I should go meet Rias… It's been a while.”
Sairaorg would never admit he didn't care about Rias at the moment and simply wanted to meet the Undying Devil who used physical strength for combat just like him.
…
At the Gremory Estate’s pristine courtyard, Zeoticus Gremory was savoring a rare moment of peace, teacup in hand, when Tiamat’s landing cracked the flagstones, tea splashing across his pristine coat.
He gaped as he saw the arriving figures.
“T-Tatsuya…? Chaos Karma Dragon, Tiamat you…?!” Zeoticus stammered, voice rising in disbelief, his usual composure nowhere to be seen.
Venelana rushed to his side and she was speechless.
Rias slid off Tiamat’s back, her legs unsteady as she hit the ground, her peerage tumbling after her in various states of disarray—Kiba catching the fallen salamander, Rias feeling dizzy, Koneko having a blank face, Ichika grinning widely with a blush and Akeno smoothing her hair with a shaky grin and trembling hands.
Lastly, Tatsuya stepped down from Tiamat’s back, meeting his stare with an eerie, unshakable calm.
“W-We have returned, Father,” Rias spoke ignoring the rush of blood.
But an odd atmosphere ensued as everyone remained silent in confusion and disbelief.
It wasn't till Sirzechs and Grayfia arrived that the tense atmosphere broke.
“I believe we need to talk,” the current Lucifer didn't even bother exchanging pleasantries as he turned to Tatsuya and spoke softly.
“Indeed, we do Maou-sama.”
“Onii-sama…” For some reason, Rias felt nervous as she tried to interrupt but was met with a flat stare from Sirzechs.
Rias closed her lips and bit her lower teeth in frustration.
She hated how she had no say in these matters.
She hated how powerless she was.
And she hated the arrogant and smug look that the dragon had been giving her from the moment they met. It's as if she was telling Rias ‘I will take what's yours and you can't stop me.’
Ichika looked at Tatsuya following Sirzechs inside the estate with both Grayfia and Tiamat walking side by side like maids.
Looking at his back Ichika couldn't help but shudder. The Tatsuya from Classroom of the Elite was slowly returning. The unbridled maniac that had no restrictions to what he did.
Perhaps it was an illusion but Ichika knew the day wasn't far.
She had seen him controlling himself the past few days. His forced scheming, calculated plans and the dangerous risk he had taken by annihilating Grigori.
Ichika knew Tatsuya didn't make such big moves without a purpose. Something must've threatened him into acting.
Perhaps paranoia? Or perhaps…
Ichika lowered her head as she slowed her thoughts down.
Time's ticking away Ichika…
…
Tatsuya and Sirzechs sat across from each other in the sleek, modern room.
Grayfia lingered behind Sirzechs quietly while Tiamat stood behind Tatsuya with a beautiful smile.
Their eyes met for a moment, tension simmering, until Sirzechs broke the silence.
“Congrats,” he said, choosing his words deliberately, “on snagging such a… powerful Familiar.”
Tatsuya gave a slight, laid-back smile. “Pure luck, I suppose. Crossing paths with Tiamat like this—could it be fate?”
Sirzechs’ lip twitched as he glanced at Tiamat. “Didn’t expect our next run-in to look like this, Chaos Karma Dragon.”
“Same goes for you, Lucifer,” she replied, her tone light, devoid of any respect. Grayfia’s brow flicked, but she stayed quiet.
Sirzechs leaned closer, genuinely stumped. “What dragged you out of your hideout?”
How had Tatsuya managed to leash the fiercest Dragon King as his Familiar?
Tiamat’s smile turned sharp and stunning, her hand resting on her cheek as she tilted her head. Her eyes narrowed to slits, a faint flush coloring her smooth, pale face.
“It was love at first sight.” Tiamat spoke gently, her voice almost like a loving whisper “I have fallen for Lord Tatsuya and can't bear to part with him, even if it means becoming his slave. However, I do wish to become his first wife!” Tiamat declared proudly.
“...”
Question marks floated above Sirzechs’ and Grayfia’s heads.
Sirzechs wasn't one to lose his calm. There were hardly any things left that could surprise him but—
—What the fuck was this ageless dragon blabbering about?
Falling in love at first sight?
Willing to become a slave?
Wanting to be his wife?
Was this the same dragon that continuously rampaged around the world before settling down? The same Dragon King that hunted down every user of the Boosted Gear without mercy?
He shot Tatsuya a look, silently begging for a punchline; some clever ruse to make this make sense.
Then, a solid thud.
“Kneel,” Tatsuya said calmly and Tiamat dropped to her knees instantly, dignity tossed aside without a second thought.
Sirzechs and Grayfia gawked, a sharp gasp slipping out in unison.
Tatsuya didn’t spare them a glance. He lifted Tiamat’s chin, his thumb grazing her slick, blue-tinted lips... slowly at first, tracing the plump curve with a deliberate drag. He pressed harder, smearing the glossy sheen across her mouth, his thumb dipping just past her parted lips, teasing the wet coldness inside. Her breath hitched, lips trembling under his touch as he rubbed back and forth, savoring the softness, the way they yielded to him, glistening with a mix of her own spit and the faint shimmer of her natural tint.
The Chaos Karma Dragon knelt, letting a fresh Reincarnated Devil strip her bare of pride.
It was so incredibly arousing that even Sirzechs blanked out for a second.
“Is this really the Chaos Karma Dragon?” Tatsuya asked, skepticism dripping. “She seems to have a screw loose.”
“She… She is undoubtedly the Chaos Karma Dragon.” Sirzechs voice was slightly distant, since he could not understand even a speck of Tiamat's behaviour it made Tatsuya infinitely more suspicious.
If he’d messed up even once, Sirzechs would’ve cornered him for answers already.
“This isn’t love, Tiamat—it’s straight-up humiliation,” Sirzechs said, prodding her. “A dragon like you… Why sully your noble name?”
Tiamat didn’t blink. Her tongue slipped out, slow and bold, licking Tatsuya’s thumb like it was a treat. She sucked it in deep, cheeks hollowing as she slurped, wet and shameless, a low moan buzzing in her throat as she stared up at him, eyes glazed with heat, spit trailing down her chin.
“Please have some decency…” Grayfia couldn't help but interrupt unable to stand it any longer.
“Crazy bitch,” Tatsuya grumbled, pulling his hand free with a scowl. Tiamat stood up, all grace, smiling softly as she slid back behind him like it was nothing.
“What do I even do with her?” he asked Sirzechs, sounding genuinely at a loss.
Sirzechs stumbled for a reply. “Well… she’s a plus, right? She’s one of the strongest beings in the world—nobody’s messing with you with her around. At least not in the Underworld.”
Tatsuya’s interest sparked, eyeing Tiamat like he was reassessing her. “Stronger than you, Maou-sama?”
The air froze immediately.
Tiamat’s face went frigid; Grayfia’s grin flashed for a split second.
Sirzechs kept it cool, voice even. “Nope.”
Tatsuya’s eyes shone with respect, and Sirzechs felt a felt a bit proud inwardly.
Tatsuya noticed something.
Sirzechs was also tossing a subtle hint— I’m your real backup. Don’t pick the wrong side.
“Ahem! Since the matter isn't as urgent as I thought it was I'll have to take my leave. There's so much work to do…” Sirzechs sighed, returning to his usual demeanor. He slid across the table as if blaming the world for all his office workload.
“Lucifer-sama, please behave yourself.” Grayfia's lips twitched.
“Sigh, always so rigid Grayfia.” Sirzechs exhaled before getting up.
A magic circle appeared beneath him as he disappeared.
He really was quick to arrive and leave.
Wait… why did he fly over here if he could've just used a Magic Circle?
Tatsuya kept his confusion under wraps, his face smooth as he glanced at Grayfia.
“Sorry about that little show earlier, Grayfia-san,” he said, voice steady. She hesitated, then nodded. “It’s fine, Yamamoto-kun. Not your fault.” Her eyes flicked to Tiamat with a scowl, still wondering how a dragon that noble could sink so low. “I’ll head out too.”
“Sure thing. Oh, and could you set up a room for Ichika right next to mine? I’d like the current one just for me and Tiamat.”
Grayfia was halfway to the door when his request hit. Her lips tightened briefly. “No problem, I’ll handle it now.”
She started walking again, and Tatsuya’s gaze trailed her every step.
At the doorway, Grayfia froze for a split second. She clenched her jaw, feeling his stare rake over her—hungry, shameless, lingering on her ass like he was staking a claim.
She was an Ultimate-Class Devil. She could damn well feel the heat rolling off him.
But she didn’t turn to call him out. She just kept moving, slipping out of the room.
The second she was gone, Tiamat let out a low disdainful laugh.
“She's way too rigid for her own good. Lord Chaos, do you intend to use this against her?”
Tatsuya snorted, “Of course. She's probably going to report my lust-filled gaze towards her to her husband… The way she behaves the next time we meet will be Sirzechs’ answer.”
“They don't seem to believe my heartfelt words though…” Tiamat sighed in mock sadness and Tatsuya rolled his eyes, “With the level of retardness in your actions they're most probably going to think I've somehow brainwashed you.”
“But isn't that what you wanted too Lord Chaos?” Tiamat tilted her head in confusion. She looked quite cute like that.
“That is fine, now they can't move against me rashly, lest incline towards the Old Faction. The caution they hold will work in my favor. Can't move rashly against the beacon of hope they created in the first place, after all.”
“As expected of Lord Chaos, having all these Devils under your thumb.” Tiamat flattered, her voice containing a hint of seduction.
She half-wondered if he’d pin her down right there, flood her with more Chaos strands, claim her in the heat of it.
But Tatsuya didn’t bite. He went quiet instead, and it threw her off.
His face blanked out—like he’d checked out of his own head. Tiamat blinked, caught off guard.
A shiver crawled up her spine as his eyes flickered back to life—one sharp and burning, the other dull, dead, and eerie.
“Finally… it’s done,” Tatsuya muttered, standing up slowly, staring at the ceiling like it held secrets.
Tiamat’s breath hitched, her whole body locking up at what came next.
The ceiling—
From the ceiling!
Strands of Chaos—hundreds, no, thousands—swirled around him, coiling tight before sinking into his skin.
For a hot second, she wanted to lunge, rip those strands for herself but her dragon instincts screamed no, slamming her with dread.
Cold sweat dripped down her neck as she dropped her gaze, heart pounding.
Tatsuya didn’t even spare her a glance, too busy soaking in the rush of World Essence flooding his veins.
Kaguya’s voice chimed in his head, smooth and sweet as silk.
[Fate has been broken. The world has veered off it's original course. Reward—25,000 units of World Essence.]
Comments
ImmortalSkyDxddy
True haha but looking at it only two days have passed in these 19 Chapters lmao
CrowThingz
"Rias closed her lips and bit her lower teeth in frustration. She hated how she had no say in these matters. She hated how powerless she was." She needs to become stronger lol
