Vampire Progenitor System Chapter 27: Heavenly Oath

Lucifer leaned forward slightly, his red eyes glinting under the low light of the room.

"What if I told you... I can get you the Progenitor's blood."

Greta froze mid-step.

Her eyes locked onto his.

That usual seductive calm on her face? Gone.

Now it was pure warning.

Like she was staring at a ticking bomb.

"Don't joke with ," she said coldly.

But Lucifer didn't flinch.

Instead, a small smile crept up on his lips.

"You never asked how I died... or why I'm only a vampire," he said calmly. "If you really knew my parents, then you'd know sothing important... I was never human to begin with."

Greta narrowed her eyes, slowly processing.

"I'm guessing you think my demon side is sealed," he added. "Because that's probably what my parents would do. They made sure I lived a normal life. Human, safe, hidden. Until I died... and ca back."

Her fingers twitched at her side, but she didn't speak yet.

Lucifer took a step closer, his voice lowering like he was about to share a dangerous secret.

"So what I'm about to tell you... it stays between us. No one else. Not your witches, not your spies, not even the shadows you hide behind."

He paused.

"I need to know I can trust you."

Greta looked at him long and hard. Her expression unreadable.

Then, in a soft voice—almost like a whisper—she asked:

"...Where are you going with this, Lucifer?"

The air between them grew heavy.

The kind of tension that said sothing big was coming.

And once it dropped, nothing would be the sa again.

Lucifer ran a hand through his hair, clearly tired of explaining.

"Look... I know a Progenitor," he said, voice low. "He's the one who turned . He doesn't need the daylight ring, so he had his servant bring it to . That servant... was Temmy—the sa girl Francisca saw. You know the rest."

He exhaled, his tone turning serious again.

"If you want to keep going... if you really want that Progenitor's blood—then I need your word, Greta. Nothing we say in this room leaves this room."

Greta stepped forward, her heels echoing lightly across the floor. She looked straight into his eyes, deadly calm.

"You have my word," she said softly.

"But not just that... I'll take a Heavenly Oath."

Lucifer raised an eyebrow, curious. "A what?"

Greta smirked a little, brushing her hair behind her ear as she explained.

"A Heavenly Oath is an ancient magical vow," she said. "Once made, if I break it—even by accident—Heaven itself will strike down. Instant death. No exceptions."

Lucifer blinked, then chuckled. "That's... dramatic."

"Witches don't play around with trust," she replied with a shrug. "Especially when it involves sothing as dangerous as Progenitor blood."

She raised her hand, and the room dimd slightly—like the shadows were holding their breath.

"Repeat after ," she said, voice calm but powerful. "By the skies above... and the stars that watch..."

Lucifer nodded, following her lead.

They said it together, eyes locked:

"By the skies above... and the stars that watch..."

"I bind my soul to this vow..."

"That no truth shared in this room..."

"Shall be spoken beyond its walls."

"Let Heaven strike down..."

"Should I ever break this oath."

The mont the last word left their lips, a quiet pulse shook the air.

A flicker of golden light passed between them, vanishing just as fast.

It was done.

Greta lowered her hand, her expression unreadable now.

"...Now talk," she said. "Tell everything."

Lucifer leaned back against the wall and let out a small smirk, the tension finally easing off his shoulders.

"Well," he said coolly, "I'm the Progenitor."

Greta's eyes twitched.

"I bluffed earlier... just to see if I could trust you," he added, shrugging.

The room dropped a few degrees instantly. A sudden chill swept through, and Greta's aura exploded like a wave of icy pressure. The lights flickered above, her pupils narrowing like a predator's.

"What... did you just say?" Her voice was sharp. Cold. Dangerous.

Before Lucifer could even take a breath, his body jerked.

"Agh—!" he groaned, clutching his head as pain shot through his skull. He dropped to his knees, his nails digging into the floor as veins darkened around his neck and face.

Greta hadn't moved an inch. Her eyes glowed faintly.

"You made take a Heavenly Oath... just to lie to my face?" she snapped, fury bubbling beneath her calm surface.

"I'm not lying!" Lucifer hissed through gritted teeth, still writhing on the ground. "I'm telling the truth. I am the reincarnated Progenitor. I don't know how it happened—I just woke up in this body a few days ago. And Temmy? That girl's my servant. Has been for centuries."

His tone changed, quieter, more bitter.

"I don't have my full powers yet. That's why I'm like this. But co on, Greta... think about it. Why else would a demon beco a full-blooded vampire? Not even a hybrid. That alone should tell you sothing."

Greta didn't respond. She stared at him, silent. Watching.

Lucifer forced himself up, his face pale but his eyes sharp again. "I knew the Heavenly Oath would lock you in. That's why I said what I said. This is the truth for you. The truth you swore to protect. So even if you're angry, my secret's safe."

Greta's fingers curled into a fist at her side, but she held herself back.

"...You're a real piece of work," she muttered. "Twisting magic like that."

"Call it survival," Lucifer said, brushing the dust off his shirt. "Now can we stop frying my brain and talk business? I'm still offering you what you want."

She stared for a long mont. The silence thickened.

Then, finally, Greta sighed.

"...Fine," she said, turning her back on him. "Let's make a deal, you manipulative bastard."

Lucifer grinned. "Now we're talking."

Greta walked toward a nearby cabinet, her heels clicking sharply against the marble floor. She opened a drawer and pulled out a silver cigarette case, popping it open with one hand. A thin, red-tinged cigarette rested inside.

She lit it with a snap of her fingers—fire flickering briefly at her fingertip—and took a slow drag before turning back to face Lucifer.

"You want the ring... for your people?" she asked, exhaling smoke through her nose.

Lucifer leaned against the wall, still a little shaken but trying to look cool. "Nah. Not just for them. Make as many as you want. Sell 'em. Weaponize them. I don't care."

He raised his eyes to et hers, deadly calm.

"But I'll be taking so for myself. And whenever I want—whenever I show up—you'll hand them over. No questions."

Greta raised a brow, her lips curling in amusent. "You sure know how to make demands for soone who just got his brain nearly fried."

Lucifer gave a lazy smile. "Cos with the bloodline."

Smoke swirled around Greta's face as she studied him, her seductive features partly hidden by the shadowy glow of the room. The light from the chandelier above flickered once, casting sharp lines across her face like an ani scene just before soone makes a move.

"Tch..." she scoffed playfully, flicking ash to the side. "Fine. I'll mass-produce the rings. I've already figured out how to replicate the core. With your blood, I'll crack the enchantnt."

She stepped closer, stopping just a few feet from him.

"But don't get cocky, Progenitor. You're not the only ancient being still breathing."

Lucifer smirked, folding his arms. "Good. I'd hate to be the only interesting one left."

Greta chuckled, turning to walk toward the large crystal table at the center of the room.

"Then we have a deal," she said, looking back over her shoulder. Her voice dropped, sultry and low. "But I expect paynt in full, darling. Blood... favors... maybe even a little entertainnt."

Lucifer's eyes glead crimson. "We'll see what you earn."