BackBirch’s Vow: Blood and Thorn

Chapter 6 - Bond Fever

BIRCH

The air in the sealed chamber still hums with the echo of his kiss.

Not just the press of his lips, the heat of his hands, the way my body arched into his like it was starved for him—but the truth that poured through the bond when our magic touched. I felt it all. His memories. His pain. The cold weight of duty that forced him into Lysara’s bed, the way his wolf recoiled from her touch, the nights he spent alone, fighting the heat, fighting the need for *me* before he even knew my name.

He didn’t lie.

He *loves* me.

The thought should terrify me. It *does* terrify me. Because if I let myself believe it—if I let myself *feel* it—then everything changes. My mission. My vengeance. My carefully constructed walls.

But as I sit across from him in the back of the armored carriage, the Blackthorn estate shrinking behind us, I can’t stop my fingers from trembling. Or my pulse from fluttering every time he looks at me.

We’re silent.

The only sound is the rhythmic clop of the horses’ hooves, the creak of leather, the low thrum of the bond between us. It’s different now. Not just a curse. Not just a tether. It’s… alive. Breathing. Like it’s waiting.

He watches me from beneath his lashes—gold eyes sharp, unreadable. His hands rest on his knees, calloused, strong, the hands of a warrior, a killer. The hands that held me, that kissed me, that offered me his father’s dagger and said, *“Kill me if you don’t trust me.”*

I didn’t.

And now I don’t know what to do with that.

“Where are we going?” I ask, breaking the silence.

“North,” he says. “The Veil’s thin there. Rogues have been crossing—vampires, half-mad with bloodlust, attacking hybrids in the Undercroft.”

“And?”

“And we stop them.”

“Together?”

He turns his head. Looks at me. “You’re my mate. Whether you like it or not, you’re in this now.”

My jaw tightens. “I’m not your weapon.”

“No,” he says, voice low. “You’re my weakness.”

The words hit me like a blade.

He sees it—the flicker in my eyes, the way my breath catches—and looks away. Out the window. At the darkening sky.

“We’re not far,” he says. “The outpost is just beyond the ridge.”

I nod. Don’t speak.

The carriage jolts over a rough patch of road. My shoulder brushes his. A spark jumps between us—heat, electricity, the bond flaring. I pull back. Too fast. Too obvious.

He doesn’t comment.

But I feel his gaze. Heavy. Knowing.

The outpost is a ruin.

Or what’s left of one.

A crumbling stone watchtower, half-collapsed, its roof caved in, ivy strangling the walls. Torchlight flickers from within—flickers, then dies. The wind howls through the gaps, carrying the scent of damp stone, old blood, and something else—rot. Decay. Vampire.

Kaelen steps out first, scanning the perimeter, his body tense, his senses stretched. Soren follows, flanking him, his hand on the hilt of his blade. I stay back, pulling my cloak tighter around me, the locket cold against my skin.

“Stay close,” Kaelen says, not looking at me. “And don’t do anything stupid.”

“Wouldn’t dream of it,” I mutter.

He glances at me. A flicker of something—amusement?—in his eyes. Then it’s gone.

We move in.

The interior is worse than I expected. The floor is littered with bones—human, hybrid, some too mangled to identify. Blood stains the walls, dried black in the torchlight. A broken altar lies in the center, its surface carved with the sigils of the Crimson Accord. Ritual site. They were summoning something.

“Vampire coven,” Soren says, crouching beside a body. “Old. Powerful. They’ve been here for weeks.”

“And they’re gone,” Kaelen says, voice low. “Which means they’ve moved deeper into the Veil.”

I step forward, my boots crunching on shattered stone. My magic stirs—uneasy, restless. The air is thick with residual power, like the aftermath of a storm. I reach out, fingers brushing the altar. A jolt runs through me—images flash behind my eyes: a woman with hollow eyes, her throat slit, blood pooling in the grooves of the sigils. A man, chained, screaming as fangs tore into his neck. A child, small, trembling, dragged into the dark.

“They’re using hybrids as offerings,” I whisper. “To strengthen the Veil. To feed their magic.”

Kaelen turns. “You can see it?”

“Fragments. Echoes.” I press my palm to the stone. “They’re not just crossing. They’re *invading*. And they’re not stopping until they’ve taken everything.”

He exhales. “Then we stop them before they reach the Spire.”

Soren nods. “There’s a tunnel system beneath the outpost. Leads into the Undercroft. If they’re moving troops, that’s how they’re doing it.”

Kaelen looks at me. “You stay here.”

“No.”

“Birch—”

“I’m not staying behind. I’m not your prisoner. I’m not your *pet*.”

His jaw clenches. “You’re not equipped for this.”

“I’m a witch. I’m a fighter. And I’m *yours*—whether you like it or not.”

The words hang between us.

He stares at me. Gold eyes burning.

Then he turns. “Fine. But you stay behind me. You do *exactly* what I say. No heroics. No sabotage.”

“Wouldn’t dream of it,” I say again.

He doesn’t smile.

But I see it—the corner of his mouth twitch. Just once.

The tunnel is narrow. Low. The air is thick with the stench of mold, damp earth, and something metallic—blood, old and new. Torchlight flickers from the brackets on the walls, casting long, shifting shadows. The stone is slick beneath our boots. Water drips from the ceiling, echoing like a slow heartbeat.

Kaelen leads. Soren covers the rear. I walk between them, my daggers drawn, my magic coiled tight in my chest. The bond hums—steady, but strained. The deeper we go, the heavier it feels, like chains tightening around my ribs.

“You feel it?” Kaelen asks, not turning.

“The bond?” I say. “Yeah. It’s getting worse.”

“Bond-sickness,” Soren says. “If mates are separated too long, the body rebels. Fever. Pain. Hallucinations. Death.”

“We’re not separated,” I say.

“No,” Kaelen says. “But the magic here—it’s corrupt. It’s interfering with the bond. Making it unstable.”

I press a hand to my temple. A dull ache has started there, low and insistent. My skin feels too tight. My breath comes short.

“We should turn back,” I say.

“No,” Kaelen says. “We’re close. I can smell them.”

And then—

The ground shakes.

Not an earthquake. Something deliberate. A *boom* from deep below, like a detonation. The walls shudder. Dust rains down. A crack splits the ceiling.

“Run!” Kaelen roars.

We move.

Too late.

The ceiling collapses.

Stone crashes down, blocking the tunnel behind us. Dust chokes the air. I stumble, coughing, my vision blurring. When it clears, Soren is gone—cut off on the other side of the rubble.

“Soren!” I shout.

“I’m fine!” his voice echoes. “Stay focused! The tunnel ahead—it’s unstable. Get out!”

Kaelen grabs my arm. “Move.”

We run.

The tunnel twists, narrows, the walls closing in. The air grows thinner. My head spins. The ache behind my eyes becomes a *throb*, sharp, relentless. My skin burns. My breath comes in gasps.

And then—

Another explosion.

This one closer.

The floor heaves. I fall. Kaelen catches me, pulling me against him as the world shakes. Stone crashes down, sealing the tunnel ahead.

We’re trapped.

Trapped in a narrow chamber, maybe ten feet across, the only light coming from a single flickering torch. The air is thick with dust, with heat, with the scent of our fear.

And the bond—

It *screams*.

“Kaelen—” I gasp. “I can’t—”

My legs give out.

He catches me before I hit the ground, lowering me gently, his hands cradling my face. His eyes are wide. Gold. Human.

“Birch. Look at me.”

I try. But my vision swims. Shapes blur. The torchlight splits into stars. I see my mother—her face pale, her lips moving in the old words. I see Lysara—smirking, wearing his shirt, whispering, *“He moans my name in his sleep.”*

“Hallucinations,” I whisper. “Bond-sickness.”

“I know,” he says, voice rough. “But I’m here. I’m not letting go.”

He strips off his coat—thick wolf-fur lined with leather—and wraps it around me. His scent floods my senses—pine, iron, heat. It should comfort me. It doesn’t.

My skin burns. My blood sings. My magic writhes, desperate to break free.

“We have to touch,” I gasp. “Skin to skin. Or we’ll die.”

He doesn’t hesitate.

He pulls me into his lap, my back against his chest, his arms wrapping around me, holding me close. His heat sears through the fabric of my clothes. His heartbeat thunders against my spine.

And then—

His hand slides under my shirt.

Warm. Calloused. *Alive*.

He presses his palm flat against my stomach, just below my ribs. The contact is electric. A jolt runs through me—pain, pleasure, need, all tangled together.

“Don’t move,” he murmurs, his breath hot on my neck.

I don’t.

Can’t.

My body arches into his touch, seeking more. My breath hitches. My pulse races.

“We’ll die if we don’t touch,” I gasp.

“Then we won’t stop,” he says.

His hand moves—slow, deliberate—sliding higher, his fingers brushing the underside of my breast. I gasp. My hips roll. My magic surges, responding to his touch, to his heat, to the bond that *screams* between us.

“Kaelen—”

“I know,” he says. “I feel it too.”

His other hand comes up, cradling my face, his thumb brushing my cheekbone. His lips graze my ear.

“You’re so fucking beautiful,” he whispers. “Even like this. Even broken. Even hating me.”

“I don’t hate you,” I breathe.

“Then why do you fight it?”

“Because I’m afraid.”

“Of what?”

“Of needing you. Of wanting you. Of *loving* you.”

He stills.

Then—

He turns me.

Not rough. Not forceful. Gently. Carefully. Until I’m facing him, my legs straddling his, my hands braced on his shoulders. His eyes search mine—gold, burning, *human*.

“Then stop fighting,” he says. “Let me in.”

And before I can answer—

He kisses me.

Not like in the forest. Not like in the archives.

This is different.

Soft. Slow. Aching. A surrender. A promise.

His lips move over mine, gentle, coaxing. His hands slide up my back, under my shirt, his palms warm against my skin. My magic flares—bright, hot, *alive*—and for the first time, I don’t push it down. I let it rise. Let it meet his. Let it *merge*.

The bond *explodes*.

Not pain.

Not fire.

Pleasure.

White-hot. All-consuming. It pours through me, through *us*, a river of light and heat and need. I gasp into his mouth. My fingers dig into his shoulders. My hips grind against his, seeking friction, seeking *more*.

He groans. His hands tighten. His cock presses against me—hard, thick, *alive*—and I arch into him, desperate.

“Birch,” he breathes. “We can’t—”

“I don’t care,” I whisper. “I don’t care if we die. I don’t care if the world burns. I just want *you*.”

He looks at me. Eyes wide. Chest heaving.

And then—

He pulls back.

Just enough to speak.

“Not like this,” he says, voice rough. “Not trapped. Not desperate. When I take you, it’ll be because you *want* it. Because you *choose* it. Not because the bond forces you.”

My breath hitches.

“And if I choose it now?”

“Then I’d be a liar,” he says. “Because I’m already yours.”

He leans in. Kisses me again—soft, sweet, *devastating*.

And then—

The torch sputters.

Dies.

Darkness.

But I don’t let go.

Can’t.

His arms are around me. His heat is in me. His heart beats against mine.

And when the walls tremble again, when the dust rains down, when the world shakes—

I don’t fear it.

Because for the first time—

I’m not alone.

And when the rubble shifts, when light filters through, when Soren’s voice calls from the other side—

I don’t pull away.

I stay in his arms.

And I know—

This isn’t just survival.

This is the beginning.

Of everything.