The Demon King's Vow

CHAPTER 3

Chains laden with magic bit into Sael’s wrists, their crimson glow faint but oppressive as they thrummed with ancient power. He sat motionless in the damp, shadowed cell, his head tilted back against the cold stone wall. Darkness pressed in from every corner, but his eyes pierced through it, unfazed.

They thought they had tamed him, broken him, bound him like some common beast to be dragged out at their convenience. Fools. He could break free if he wished, tear these enchanted shackles apart, and reduce this entire palace, and perhaps the kingdom beyond it, to rubble with little effort.

But meaningless and fleeting destruction no longer held the appeal it once did. His hands might be bound, but his mind wandered, circling the offer laid at his feet like a poisoned chalice two nights ago. The so-called rulers who held him captive had whispered promises of power, of freedom.

Empty words from trembling lips. Did they think him so naive, so easily swayed by baubles and fleeting rewards? When had a king ever bowed to another’s whims? The answer was simple: he hadn’t. Not in the days of his conquest, the centuries since his downfall, and certainly not now.

And yet here he sat, the shackles still unbroken. Not because they had won, but because their games intrigued him. The stakes were higher than they realized, and the piece they had offered to move—their princess, their heir—was too fascinating to ignore. It was the first form of entertainment offered to him since they had tried to give him a cellmate for “company” a few decades ago.

He chuckled darkly as he remembered fondly how sweet his former cellmate’s screams had been.

They hadn’t given him another toy since then.

His lips curled into a sharp smile, the expression teetering between amusement and malice. The princess. Syrrel. A name he’d only heard in passing whispers from the guards who were too scared to speak of her too loudly in his presence. They spoke of her beauty, her poise, her kind nature. A beacon of light to her people.

But Sael didn’t care for such trivialities. Beauty could shatter, and kindness? Kindness was weak. No, what intrigued him was her audacity. The woman who thought she could bind a living legend to her will, wielding him like a blade to defend her because she was too fragile to do it herself. He could already picture her face, a calm mask of royal composure cracking the moment she realized the error of her gamble.

He chuckled low in his throat, the sound reverberating through the stone walls like a growl. The deal was simple: take the vow, protect her until the (rescheduled) coronation, and he’d gain… what? Power? Freedom? It was laughable, truly.

What kind of fool believed she could control a demon? What kind of ruler would walk into the lion’s den with her head held high? He was sure he would find out soon enough, if the sounds of multiple sets of feet echoing down the hallway were anything to go off of.

For a moment, there was only darkness: thick, oppressive, and alive with the weight of his power. Sael let the silence stretch, savoring it. The flames lighting the hall outside his cell flickered weakly, cowering from him, as if they, too, understood who, or better yet, what, he was.

The door creaked open, spilling the faintest sliver of light into his domain. He didn’t move, didn’t blink, but his eyes, fierce as an unrelenting storm, pierced through the shadows like a predator stalking its prey. They locked onto her instantly.

The princess.

He felt her gaze falter under his own, the weight of it pressing down on her like an iron hand. Sael allowed the silence to stretch further and watched as her breath hitched ever so slightly, her composure wavering beneath the force of his presence.

The guards behind her were no better. He felt their heartbeats stutter at his presence, unstable and weak as if his mere gaze had reached out to crush them.

Pathetic.

His lips curled into the faintest smirk. He had seen this scene play out countless times before: fools trying to mask their fear in his presence, their courage crumbling under his scrutiny. And yet… this one intrigued him. Her fear was clearly there, but it did not consume her. He could see it in the way she held her ground, the way she fought to keep her expression calm, her body still. She was trying to be brave.

Silly little thing. Did she even realize how pointless it was? Bravery meant nothing to him. He would unravel her like he’d done to so many others before her. It was only a matter of time.

The corners of his mouth twitched as he finally broke the silence, his voice a growl that reverberated through the stone walls like the rumbles of distant thunder.

“Well…” he drawled, each word dripping with mockery. “So this is the little princess who thinks she can tame me.”

Her shoulders tensed just the slightest bit, a reaction most would have missed, but he didn’t. He saw everything. The way the guards stiffened behind her, the flicker of uncertainty that danced in her eyes before she swallowed it down.

Good. Let her squirm. He could feel her unease, her pulse quickening even as she fought to maintain her composure. It was intoxicating.

But then she did something unexpected. She stepped forward. Past the threshold. Into his domain.

The smile that crept across Sael’s face now was sharper, darker, his fangs glinting faintly in the torchlight.

Oh, this will be fun.

Sael’s fire-gold eyes burned brighter as she crossed the threshold into his cell. She walked with an air of composure, her head held high, shoulders squared, the soft rustle of her gown echoing in the suffocating stillness of the room.

Sael knew how to read people. He saw the way her fingers brushed against the fabric at her sides, a subtle motion, as though she were grounding herself. A nervous tick, perhaps?

He leaned forward slightly, the movement slow, deliberate, and menacing. The chains binding him clinked softly, the magic surrounding them flickering in warning, but his focus remained unbroken. His gaze raked over her, assessing, dissecting, and lingering just long enough to make her feel as though she’d been laid bare under his scrutiny.

So this is the princess. Syrrel. Her name turned over in his mind like a blade, sharp yet curious. She wasn’t quite what he’d imagined. Her form was wrapped in royal finery that seemed almost like a mockery in a place like this, yet there was something in her eyes that caught his attention.

They weren’t wide with fear, nor were they brimming with the arrogant superiority he so often despised in royalty. No, hers were steady, calculating. Not entirely untouched by fear, but laced with something far more dangerous: determination.

Interesting.

He leaned back against the wall, the cold stone pressing into his skin as his lips twisted into a cruel smile. He could almost feel the tension radiating from the guards at her back, their hands tightening around the hilts of their swords with every movement he made. He dismissed them as insignificant gnats. His focus remained on her.

“You have courage,” he crooned, eyes alight with amusement. “Or, perhaps stupidity. The two often walk hand in hand.” He tilted his head, gaze narrowing as he studied her. “Do you know what happens to those who enter a monster’s cage, Princess?” He used her title, but not in any way that could be considered respectful. No, his tone dripped with disdain as the word rolled off of his tongue.

Her jaw tightened ever so slightly, a flicker of a reaction that didn’t escape him. Her voice, when she spoke, was surprisingly steady. “I suppose it depends on the monster.”

Sael laughed—a sharp, mocking sound that echoed off the stone walls. “Good answer.” He shifted again, the chains rattling as he moved, his face partially illuminated by the faint glow of torchlight. “But tell me, Princess, what makes you think you’re any different? That you’ll be the one to walk out of here unscathed?”

He could see her throat move as she swallowed, but she still didn’t falter. “Because I’m not here to cower before you,” she said, her voice firming with each word. “I’m here to strike a bargain.”