My Sister Stole My Mate, And I Let Her

Chapter 500: Chapter 500 GO FUCK YOURSELF

SERAPHINA’S POV

The darkness did not stay contained to Jack’s former form.

It pressed in from every side of the courtyard, swallowing the fractured edges of reality until there was nothing left but a vast, suffocating expanse of black.

The manor, the Lockwoods, Catherine’s composed manipulation, even what was left of Jack—they all blurred and dissolved as if they had never been anchored to anything real in the first place.

Only Kieran remained.

His hand was still locked around mine, the only point of warmth in a world that had turned frigid.

I clung to him with everything I had, as though the simple act of letting go would mean losing the last thing tethering me to my own existence.

But even he began to flicker at the edges as the darkness shifted again.

And then it spoke.

Not with words at first, but with intent—pressure against my mind that weaved through my thoughts.

‘Accept me.’

The darkness was no longer just a presence. It had a will now, a hunger that felt disturbingly intimate, as though it had been waiting for me specifically, patiently, across time I couldn’t measure.

Kieran tightened his grip, his body shifting in front of me, and I could feel him trying to become solid enough to shield me from what could not be fought in any ordinary sense.

But the darkness only laughed—a mocking, cold sound that turned my insides to ice.

It rippled outward, and suddenly the courtyard was gone entirely. There was no ground beneath us anymore, only a suspended void that stretched in all directions like a black hole mirror of reality.

And in that void, the darkness took form again.

Not a shape I could understand, but something vast and coiling, like a living hurricane stitched together from corruption and rage and hunger.

Its presence pressed against my skin, against my mind, against every sense I had.

And then it spoke again, clearer this time.

“Choose.”

The word reverberated through me, not as sound but as command.

“I will take you,” it continued, voice folding into itself like layered echoes, “or I will take everything you know.”

Images flickered through the blackness—Kieran being torn away, Jack’s unstable form collapsing into nothing, Catherine’s manipulative warmth shattering like glass under pressure, my family going up in flames.

“Accept me as your mate,” it said, and the word ’mate’ sounded like something stolen and corrupted, “or watch them be erased.”

Kieran’s hand tightened, his voice low. “Don’t listen to it.”

But even as he said it, I felt the strain in him. The way the bond between us trembled under the pressure of something more powerful than either of us.

My throat tightened.

This was the same feeling as before—Catherine’s warmth, Jack’s pull, the Lockwoods’ rejection—but amplified until it became unbearable. Until it felt like every version of my life was being peeled apart at once.

The darkness leaned closer.

And then it smiled—if something without a face could still manage the concept.

“You are already alone,” it whispered. “You always have been. Accept me and let that agony end.”

Something inside me cracked at that.

In a way, it was true. All my life, I’d only ever been able to count on myself. The concept of family and friends had never meant the same for me as it did for others.

And I hated the part of me that hesitated, wondering, just for a moment, if surrender would truly finally release me from the loneliness and pain.

My hand trembled in Kieran’s as he turned to me, his back to the darkness.

“Look at me,” he said, but his voice was fading in and out like someone was fiddling with a dial.

His form kept flickering, and all I could see was the bottomless depth of his dark eyes.

“I don’t know what this is,” he said, voice ragged with equal parts fear and conviction. “But I know you’re mine.”

His free hand clamped my shoulder, desperation and urgency flowing through his touch. “You’ll never be alone again, Sera, I swear on my life.”

In that moment, he solidified, and I saw him clearly for what he was.

Someone who had stepped between me and every force trying to define me. Someone who had looked at me—not as a disappointment, not as an experiment, not as a possession—but as me.

And he wanted me.

The hesitation died.

I tugged, pulling Kieran behind me, and then glared up at the darkness.

“No.”

My voice was small at first, almost swallowed by the void, but it steadied as I spoke again.

“Whatever you are, I will never accept you.”

The darkness stilled, and if something disembodied could express shock, it did.

“You refuse?”

“Yes,” I said, firmer now, even though my heart was hammering so hard I thought it might split my ribs open. “I refuse. Kindly go fuck yourself.”

The pressure increased violently, as if reality itself were recoiling in anger. The void around us distorted, stretching and twisting as if trying to force itself into my mind and body.

“Then you will watch them all die,” it snarled. ”And then I will kill you, slowly, intimately. I will have you begging for mercy with your final breath.”

Before I could react to the threat, the darkness surged like a tidal wave of collapsing existence, rushing directly toward us with the force of something that had never known obstruction.

The impact alone felt as if my senses were being crushed inward, like sound and sight and thought were being folded into a single point of unbearable pressure.

Kieran lunged to meet it.

But I saw it clearly—he wasn’t strong enough for this. Not alone. Not against something that wasn’t even properly real.

“Kieran—” I started.

And then everything changed.

The moment the darkness struck, something inside me...answered.

A presence I didn’t know how to name surged upward from somewhere deep beneath my consciousness, breaking through the fractured layers of everything Catherine had tried to rewrite in me, everything Jack had pulled me toward, everything I had been made to believe I was.

The world snapped.

The darkness froze mid-motion.

Kieran turned sharply, his eyes widening as he looked at me. Within the fraction of a second, I saw his expression shift from confusion to recognition, and finally to relief, his lips parting in a shaky breath that sounded like laughter.

“There you are.”