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alexsteev · 6 days ago

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Heat of the Beast

Warnings: nsfw, rough smut, rutting instinct, size difference, mild breending kink, use of devil fruit (zoan hybrid form), possessive dominance

Word Count: 3275

Pairing: Rob Lucci x AFAB!Reader

crossposted on AO3

The signs had been there all day.

You had seen it in the way Lucci watched you — those intense, slow drags of his green-gold gaze across your body like he was memorizing you, branding you. The way his fingers lingered too long against yours when passing a cup of tea, the way his breathing had become almost imperceptibly deeper, slower, more deliberate.

Heat. You knew what it meant by now. Once a month, his animal blood overpowered even his iron will, dragging him down into a storm of instincts he usually despised. He hated losing control. Hated being reduced to nothing but the primal urge to take, claim, breed.

Tonight was worse. You could feel it in the air between you — thick and heavy, almost buzzing. And even now, as you sat on the bed, pretending to read, you could feel him looming just beyond the doorway. Watching you.

Waiting.

"Lucci?" you called softly, heart pounding, pretending not to hear the way your own voice trembled slightly.

There was a long pause — and then the slow, deliberate thud of his boots across the floor. He stepped into the room, and the air shifted immediately.

You swallowed hard.

He wasn't fully shifted — not yet — but you could see the signs: the sharp gleam of his pupils narrowing into slits, the slight enlargement of his canines when he exhaled slow through his teeth, his muscles tensed and coiled tight under his black shirt.

When he spoke, his voice was lower than usual — rough, thick with restraint. "Come here."

Not a request. A command.

You set the book down with trembling fingers and stood. Your steps were hesitant — not from fear — but from the electricity that seemed to snap between your bodies as you approached.

You barely had time to inhale before he seized your wrist — gently, but with a grip that brooked no argument — and pulled you close, pressing your smaller form against the broad, tense wall of his chest.

He was burning to the touch. Heat radiated off him in waves. His scent — deep, musky, wild — curled around you like smoke, dizzying and addictive.

His head dipped low, his lips ghosting the shell of your ear.

"You smell like you want me," he murmured, voice a dangerous rasp. "You know what I need. Don't you?"

You nodded weakly, breath hitching, body already betraying you — arching into him, thighs pressing together.

He chuckled low — a dark, rumbling sound from deep in his chest — and his hand slid possessively down your side, over the curve of your waist, pausing at your hip. Holding you there.

"Say it," he ordered softly. "Tell me you’ll let me."

You shivered — half from nerves, half from the way his dominant presence swallowed you whole.

"I’ll let you," you whispered, barely audible. "I’m yours."

A growl vibrated against your body in response — approving, pleased — and then suddenly the heat between you ignited.

His body began to shift against yours — taller, broader, heavier — as the beast inside him took over. Muscle thickened under your palms; black-spotted fur prickled against your fingertips; claws pricked the bedsheets when he caged you against the mattress.

His hybrid form was terrifying — breathtaking — devastating.

A massive leopard-man looming over your much smaller frame, his green eyes burning down at you with pure, unfiltered hunger. He bent over you, nudging your cheek with his nose, inhaling deeply.

"Mine," he rumbled — a savage, reverent declaration.

You whimpered when his clawed fingers gripped your thighs and pushed them apart — rough but careful — as though he barely trusted himself not to tear you apart.

His mouth grazed the sensitive spot below your ear — and for a moment, he simply hovered there — breathing hard, muscles trembling with restraint.

"Last chance," he rasped, voice breaking with need. "Tell me no, and I’ll walk away. I’ll fucking tear myself apart if I have to. But if you say yes..."

You tilted your head back, throat bare to him, surrendering completely. "Yes," you breathed.

And that was all it took.

He surged forward — kissing you bruisingly hard, hands everywhere — dragging you down into the primal, raw hunger he'd bottled up for too long.

You moaned into his mouth as he manhandled you effortlessly — lifting you, spreading you, grinding the massive, throbbing heat of him against your core through the thin barrier of your panties. Still clothed — but barely — the friction between you was overwhelming. You could feel the hard outline of him, huge and leaking through his pants, rutting against you in slow, desperate rolls of his hips.

Your skirt bunched up around your waist; your panties were soaked through in minutes.

Lucci's claws shredded the front of his own trousers enough to free himself — thick, slick, dripping precome already — and he pressed the blunt, hot head against your trembling entrance.

Still fully clothed, panting, grinding against each other like animals in the dark. You clutched at his spotted fur, nails digging deep, gasping his name.

"Lucci—"

"Shh," he growled against your throat, grinding harder, his cock catching against your clit just enough to make you sob.

"Take it," he rasped. "Be good for me. Let me have you."

One savage thrust — and he buried himself halfway inside — the stretch nearly unbearable, so big it stole the breath from your lungs. He froze immediately, a guttural snarl ripping from his throat as he fought the urge to slam into you.

"Too tight," he growled against your shoulder. "So good—fuck, you're good—"

He rocked his hips in tiny, controlled thrusts — barely moving — stretching you slowly, agonizingly, forcing your body to take every thick inch.

Your legs trembled, wrapped around his waist.

Every movement was clumsy, desperate, still fully clothed, driven by pure animalistic need.

Lucci's mouth latched onto your throat — not biting, but hovering dangerously close — and his entire body shook with the effort of holding back enough not to hurt you.

"Mine," he rasped again. "Always. Forever."

You could only nod helplessly — body burning, nerves on fire — as he finally bottomed out inside you, filling you completely, claiming you in the most primal way possible as his cock throbbed deep inside you, buried to the hilt — impossibly thick, stretching you so full it made you whimper breathlessly against his furred chest.

And for one, trembling moment — Lucci didn’t move. He hovered there, shuddering, arms locked on either side of your head, whole massive body tensed like a bowstring drawn to its limit.

You could feel it. The primal, trembling urge inside him to just take you. To rut into you like a wild animal until you forgot your own name. But somehow — barely — he held himself still, teeth gritted, low snarling breaths rasping against your neck.

"Too small," he growled roughly, voice cracked with the effort of restraint. "You're too fucking small—"

You whimpered, squirming helplessly underneath him — but the tiny flex of your hips against him was enough to shatter what little control he had left.

He snapped.

The first thrust wasn't pretty — it was brutal, needy, frantic — a dragging pull-back of his hips that made you keen, made your nails rake helplessly down the thick muscles of his arms. When he drove back into you, it wasn't smooth — it was clumsy, messy, as if he couldn’t not slam back to the deepest part of you, chasing some feral, inborn high.

"Fuck—," Lucci snarled, forehead dropping to press against yours, his whole body shaking.

He pumped his hips in shallow, devastating thrusts — grinding you down into the mattress, holding you like you might disappear if he let go.

Each thrust was a struggle — not because he wanted to stop — but because he wanted to fuck you harder, deeper, rougher than your body could take. He cursed low and vicious under his breath in between every slow, desperate thrust.

Your thighs clung to his waist, trembling, heels digging into the small of his back, trying to keep him there — pressed so deep inside you that you felt him everywhere.

"S-so good," you gasped, arching up into him, sobbing his name.

Lucci snarled — a dangerous, wrecked sound — and bent to crush your mouth under his in a kiss that was less kiss and more claiming.

Teeth scraping. Tongues tangling. Breathless, broken gasps between the slamming of hips against hips.

"Say it," he demanded raggedly against your mouth, pounding into you with short, brutal thrusts that made the whole bed shudder. "Say you're mine."

"Yours," you sobbed without hesitation, clinging to him, body clenching tight around the thickness of him.

He lost it.

With a guttural growl, he shoved one huge arm under your waist — dragging you impossibly closer, tipping your hips up at a brutal angle — so he could bottom out even deeper inside you, grinding against your cervix with every desperate thrust.

"That's right," he snarled. "That's right. Mine. Mine. Fucking—mine."

He was rutting into you like he couldn't stop — rough and relentless, making you cry out with every slam of his hips, tears slipping down your cheeks from the overwhelming stretch, the raw burning pleasure.

Your body clung to him, trembling, and it only made him more frantic — chasing the smell of your heat, the slick between your thighs, the desperate way you mewled his name like he was the only thing in the world that mattered.

"Gonna breed you," he growled against your throat, voice raw, almost mindless. "Fill you up. Knot you if I have to. You're mine."

You sobbed something — yes, please, anything — and that was all he needed.

His hips slammed into you faster, messier, all rhythm forgotten — reduced to pure instinct, rutting hard and wild and mindless, grinding you into the mattress with each possessive thrust.

You barely realized you were coming until your whole body convulsed — clenching tight around him — sobbing his name brokenly into the crook of his neck.

Lucci growled— A ragged, feral sound that was half-pain, half-ecstasy — And his hips stuttered once, twice — before he drove himself impossibly deep one last time and came. The heat of it spilled inside you — endless, overwhelming — filling you up so much that you whimpered against his neck, nails raking down his back as he ground against you through the aftershocks.

Even after he came, he didn't stop moving — slow, shallow grinds, refusing to pull out, cock twitching deep inside you, his massive frame caging you down, panting harshly against your throat. Still trembling. Still barely holding back from starting all over again.

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You couldn’t breathe. Not properly. Not with the way Lucci’s massive body was pressing you into the mattress, the heat of his skin searing against yours, his cock still sheathed so deep inside you it felt like you’d never be empty again.

He was trembling. Full body, bone-deep shakes — low, ragged snarls rumbling against your throat like he was still fighting himself, even though the worst of his heat had been sated. His arms locked tighter around your waist, keeping your hips pinned flush to his.

You whimpered softly — half overwhelmed, half aching — trying to shift, to ease the heavy stretch where he was still grinding slow, instinctive rolls into your sore, soaked cunt.

The second you moved, Lucci growled — deep, guttural — and shoved himself deeper, grinding into the soft, swollen spot inside you with brutal finality.

"Don't—" he rasped, voice shredded raw from panting and snarling. "Don't move. You're not going anywhere."

You could feel the thick twitch of him inside you — the way his cock swelled slightly, as if even the thought of pulling away made his body rebel. Possessive. Wild. His green eyes, glowing faintly in the darkness, pinned you — the feral glint in them making your heart stutter and your body shiver under him.

Slowly — as if he didn't trust himself — he nuzzled his nose against your neck, dragging in slow, ragged breaths of your scent. You felt the gentle scrape of his fangs skim the soft skin there — not biting, just hovering, threatening.

A reminder. A warning. You were his. You would stay his.

"Smell like me now," Lucci rumbled hoarsely, voice dropping to a dangerous purr. "Inside and out. They’ll know who you belong to."

You whimpered — overwhelmed, trembling, brain foggy from the brutal fucking and the way his weight blanketed you.

Your fingers twitched weakly against his back — still buried in the thick fur between his shoulder blades — and Lucci purred lowly in response, pressing his entire body closer, caging you against the bed as if he could merge you with himself if he just pressed hard enough.

Even soft, even done, there was no escaping him. You were stretched to the brink around him — aching, throbbing — slickness smearing between your thighs, a messy, embarrassing wet heat. But Lucci didn’t pull out. Didn’t let you breathe.

His hips gave tiny, unconscious rocks — not to fuck you, not yet — just to keep himself inside, to keep the bond sealed, to keep your body trembling around his cock until you couldn’t remember what it felt like to be alone. His nose brushed your jaw, a rare, dangerous tenderness in the way he held you — like a wounded animal clutching its mate, afraid you might vanish if he loosened his grip.

"Little thing," he rasped, the words a broken, reverent snarl against your skin. "Took me so well."

You keened softly — overwhelmed, flooded with the heat and praise and the lingering, dizzy ache of being so utterly filled.

He shifted, lowering himself even more until your chest was pressed flush to his — your heart pounding frantic against his much slower, rumbling pulse.

Slowly, gently — he hooked one massive, furred hand under your thigh and hitched it higher around his waist, making your battered core clench weakly around him, earning a low, dangerous growl.

"Fuck—" he gritted out. "Tight still. Don’t squeeze me—"

But your body wasn’t listening — clenching and fluttering helplessly around the thickness of him, still greedy even after being ruined. Lucci’s control frayed further — he pushed into you with a shallow thrust, slow but unstoppable, grinding deep where you were most sensitive. You whimpered, head lolling back against the pillow.

He didn’t stop — moving in slow, aching, endless rolls — dragging his cock along every battered, oversensitive nerve inside you until your thighs were trembling and you were mewling brokenly against his shoulder. It wasn’t rough anymore. It was tender now — brutal in a different way — as if he was trying to mark every inch of you from the inside out, to imprint himself so deep that even time couldn’t wash him away.

The air was hot, sticky, heavy with the scent of sex and sweat and something more primal — something that made your instincts curl inward, pressing closer, submitting without even thinking.

Lucci pressed his forehead to yours, breathing raggedly through his nose, one hand still cupping the underside of your thigh, the other wrapped tight around your back, keeping you caged and motionless under him.

"You’re mine," he whispered, voice wrecked, low, barely human. "Always. Even if you run, little thing. Even if you fight me. You're mine."

You whimpered weakly, nodding — because you couldn’t speak — because it was true — because even if you could have fought him, you never would.

You were his. And he would never let you forget it.

He nuzzled your jaw again, low growls of satisfaction rumbling through his chest as you sagged bonelessly under him — utterly, completely spent — trembling from the overwhelming fullness and the soft, endless way he rutted into you, claiming you over and over, even in the trembling aftermath.

You didn’t know how long he stayed like that — fucking you slow and deep and possessive in the dark, murmuring broken, snarling praises against your skin.

For a long moment, neither of you moved.

The only sound was your broken, shaky breathing against his massive chest, and the low, rumbling growl in his throat that hadn't fully stopped — a deep, vibrating sound of possessive satisfaction and lingering hunger.

You clung to him — fists tangled in the thick fur at his shoulders, face buried in the crook of his neck. And he buried himself deeper around you, curling his larger body protectively over yours, surrounding you in heat and scent and the heavy, primal thrum of his heartbeat.

His cock still pulsed deep inside you, a slow, lazy twitch of ownership that made you whimper softly — overstimulated, overwhelmed — but somehow craving even more.

You could feel the way his muscles trembled under the fur. Not from exhaustion — no. From restraint. From the brutal, raw effort it took not to flip you over and take you again, harder, rougher, the way his instincts demanded.

Instead, Lucci dragged in a deep, shuddering breath — and pressed his huge, clawed hand between your shoulder blades, cradling you close.

"You’re safe," he rasped into your hair. His voice was rough, ragged — the words almost a plea. "With me. Always."

You nodded weakly, still trembling. One massive hand slipped under your thighs, adjusting you so gently it made your chest ache. He moved slowly, carefully — as if he thought you might break if he wasn't careful enough. Still half-dressed, your skirt pushed up indecently around your waist, your panties hanging loosely from one ankle — but he didn’t seem to notice, or care.

All he cared about was the way you smelled — the way you felt — warm, spent, and utterly his.

His tongue — rougher in this form — rasped slowly over your shoulder, a slow, claiming lick that made you shiver again. Marking you. Scenting you. Binding you to him in ways far deeper than any ring or vow could.

You tilted your head weakly, exposing your throat without thinking. The growl that tore out of him was feral — but somehow gentle, too.

Slowly — agonizingly slow — Lucci shifted back, just slightly: shrinking down from his full hybrid form until he was still larger, still powerful, but more human in shape. Still, his green-gold eyes blazed down at you with naked, possessive adoration.

He cupped your jaw with one clawed hand, thumb stroking your cheek — a soft touch that betrayed the animalistic hunger barely restrained beneath his skin.

"You're too good to me," he murmured roughly.

You blinked up at him, dazed, body still thrumming from the aftermath. "I love you," you whispered hoarsely, voice wrecked from crying out his name.

Lucci stiffened — just for a moment — and then his mouth crashed against yours, devouring you in a kiss that tasted like desperation and devotion. When he finally pulled back, his forehead dropped against yours.

He was breathing hard, trembling slightly. "I almost lost control," he confessed in a low, tortured whisper. "You made me feel—" His voice broke off, strained.

You stroked his jaw with trembling fingers. "You didn’t hurt me," you promised softly. "You never could."

Another deep, shuddering breath from him — as if your words physically relieved something heavy in his chest. Carefully, Lucci shifted again — this time fully back into his human form — and collapsed onto the bed with you, wrapping his massive body around yours.

His green eyes watched you — not cold now, but something devastatingly raw. As if you were the only thing tethering him to the world.

One large hand splayed protectively over your belly, fingers curling as if to shield the most vulnerable part of you from the world. He buried his face against your throat again, murmuring something so low you almost didn’t catch it.

"Mine," he breathed. "Only mine."

You smiled weakly, closing your eyes, letting the heavy warmth of him lull you into a fragile, exhausted peace.Outside, the world spun on — but here, in this dark little cocoon of heat and whispered devotion, you were safe. Cherished. Claimed.

This was a little request from @potato-imouto under this post. I hope you liked it sweetheart 😘

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