Seven Sins System Chapter 606. Final Sin

Seven Sins System Chapter 606. Final Sin

I don’t know how long we’d been doing this.

Minutes? Hours? It didn’t matter anymore.

Everything blurred into one endless rhythm of thrust and cry, groans and moans, sweat and heat and need that refused to die down. I hadn’t pulled out even once. Not even a second. It was like some primal force inside me had snapped, decided that once I was inside her, I was never leaving.

We’d climaxed—again and again.

It didn’t stop me.

Didn’t stop her.

My erection never faded. It kept twitching inside her, pulsing, aching, demanding more.

At some point, my system lit up like a festival firestorm—flickering notifications hovering at the edges of my vision in warning-red and gold text.

[Warning: You have broken one of your core seals.]

[You are now eligible for Tier Ascension: Final Sin]

[New Skills Unlocked: ??? – Awaiting Stabilization]

[Caution: Remaining Seal Will Break Under Continued Divine-Demonic Fusion]

[Caution…]

I blinked at them. Ignored them.

‘Sex first.’

I was that horny.

Besides, who the hell cared about a Tier Ascension when a literal goddess was riding me like her life depended on it?

And not just any goddess.

The Goddess of Chastity.

My enemy. My equal. The one I wasn’t supposed to touch, much less do this with. And yet here she was, her hands on my chest, thighs clamped tight around my waist, grinding down on me in raw ecstasy while her divine light tangled with my darkness like we were rewriting creation with every thrust.

And I wasn’t even in my human disguise anymore.

This was my true form.

My battle form.

Hardened skin. Demonic armor cracked with glowing purple. Obsidian horns, claws, a body forged for war—not love. Definitely not sex.

Even Ivy—sweet, wicked Ivy—never touched me like this in this form.

This body was made to kill. To tear.

And yet here I was—flat on my back on warm stone, letting Puriel take dominance over me. She rode me like a queen reclaiming her throne, her hair sticking to her shoulders, her eyes glazed in need, her body soaked in sweat and pleasure. She moaned with every bounce of her hips, every time she dropped herself down and took me to the base.

And… I moved with her.

I thrust up into her with each rhythm, my claws digging into the rock, trying not to lose it as her divine warmth squeezed me again and again.

The cave groaned.

I barely noticed.

Until I glanced around again—and saw the cracks.

They weren’t small anymore.

The walls looked like shattered glass now, glowing from within with leaking power. Divine and demonic mana spiraled through the air like ghost-light, wrapping around the stalactites, the floor, the edges of the room.

My brow furrowed.

“Puriel,” I managed through clenched teeth, still moving, still buried inside her. “I think the cave is crumbling…”

She moaned in response.

A long, high sound that vibrated against my skin as she leaned forward, her hands pressed flat on my chest, her hips slamming down again with no intention of stopping.

“I just came a minute ago,” I hissed, shuddering as my core trembled again. “And you’re… riding me again.”

She arched her back. “I… can’t stop,” she whispered, her voice strained and breathless. “You feel too good…”

Damn it.

This was so wrong.

The cave, the magic, the energy—none of it was stable. Something was going to break. Probably us if this kept going.

“Puriel,” I said, grabbing her hips to still her. “Listen to me—”

But she leaned down, kissed me again, desperate and full of heat, her tongue invading my mouth like it had every right to rule me.

And help me, I kissed her back.

Because I wanted her. Every part. Every second.

But—

I couldn’t let this keep going.

I could feel it—deep inside me—that something final was about to give. The last seal. The core that kept my full form restrained. If I let it go in this state… I didn’t know what would happen.

To me.

To her.

To the world.

With a snarl of regret and a final groan that ripped from my throat, I flipped us.

Swift and hard.

My hips thrust one last time into her as we moved—then I pulled out.

Fully.

For the first time.

She gasped, her body shaking as she reached for me, confusion—and a hint of panic—flashing in her eyes.

“Why?” she whispered, still flushed, her lips trembling, her thighs slick and twitching against the stone beneath her.

I hovered over her, panting hard, my arms shaking from restraint, my cock still hard and glistening between us.

“You need to come back to your senses,” I said, forcing every word past my lust. “The cave’s breaking apart. We can’t keep doing this. Not here. Not like this.”

She blinked.

Looked around.

Saw the fractures. The glowing mana bleeding out of the walls. The shimmer in the air.

And for the first time since we started…

I saw fear in her eyes.

Not from me.

But from what we’d done.

What we’d awakened.

The cracks weren’t just cosmetic now. The walls pulsed with unstable energy, leaking divine and demonic magic like veins torn open. The cave groaned around us—alive, angry, unstable. I could feel it in the stone, in the air, in the way our very presence warped reality.

She reached up, brushed my face with trembling fingers, her palm soft against the rough plates of my true form. Her touch was gentle, but her lips quivered.

“I’m sorry,” she whispered, voice breaking. “I didn’t want to stop…”

“I didn’t either,” I said, lowering my head until our foreheads met. Our breath mingled—fast, hot, and laced with everything we hadn’t said. “But if we don’t stop now—we’ll never leave this place.”

She blinked up at me. “Do you think it’s… because of us?”

“I know it is,” I said, voice low, grim. “We weren’t supposed to do this. Not here. Not like this.”

Her gaze flicked to the pulsing ceiling, the splitting floor. “What if we already crossed the line?”