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vultursvolans · 4 months ago

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— ☆ 𝐂𝐔𝐑𝚰𝐎𝐒𝚰𝐓𝐘 𝐊𝚰𝐋𝐋𝐒

𝐬𝐲𝐧𝐨𝐩𝐬𝐢𝐬: you’ve seen lucifer’s demon form but you can’t shake the feeling that’s it’s not all he is. what if there was something darker beneath his beautiful visage? you ask to see more but lucifer warns you it may be too much for mortal eyes. as he slowly unveils the facets of his true self, you wonder if you can love something incomprehensible? and more importantly, can it love you back?

𝐜𝐨𝐧𝐭𝐞𝐧𝐭𝐬: OM!LUCIFER x GN!reader, SFW but slightly suggestive, DARK ROMANCE ♥️, HORROR ELEMENTS, implied sex but no smut, established relationship but in the earlier stages, light angst, celestial war mention, he calls you ‘my dear’, demon x human, monster romance(?), ik my title is ‘curiosity kills’ but i promise no one dies 2.0k wc. | masterlist

𝐚/𝐧: woo! my first fic for 2025. halloween is long gone but spookyookyooky vibes are forever. i haven't written for lucifer (or the obey me fandom) since 2021 so please be kind! i love when artists draw the demons as monster-like so it inspired me to write this

reblogs and interactions are always appreciated ˚ʚ♡ɞ˚

They say curiosity killed the cat but nobody ever warns you what happens when the thing you seek is something you love. Sometimes curiosity doesn’t just kill, it pulls you into the depths and reminds you that some paths were never meant to be tread at all.

You knew Lucifer’s demon form. Every time he brought it out, you couldn’t miss it. No one did. Those horns curling from his head, those raven wings that stretched with an elegance befitting for the pride incarnate, the diamond birthmark adorning his forehead. He looked every inch the fallen angel. Dangerous. Powerful. But still akin to something recognisable. Something human. That was what you thought his “demon form” meant, or at least the extent of it.

But the closer you got to him, emotionally, physically—you suspected more. This was Lucifer, after all. The same Morning Star who watched the Celestial Realm itself fracture, the one who waged war and defied his own Father for his sister’s sake. Of course, there would be layers to him, parts hidden beneath polished veneers that he might not want you to see.

The revelation came gradually, though not accidentally. He’d never risk an accident with something like this. It wasn’t just about protecting you, it was also about managing what it would mean for him to be fully seen.

It began one night in his room. His usual form was already on display, horns casting long shadows on the walls as his wings arched lazily behind him. You were comfortable with this version of him, so much so that you’d leaned into his shoulder, tracing his horns absentmindedly as he read aloud from some aged, prodigious book. The question had been on your mind but you didn’t realise what you’d said until the words were out of your mouth.

“Is there more?” You asked concretely.

He stilled, halting his finger mid-sentence against the page. “More?” his voice was neutral like always.

“Of… this,” you gestured vaguely at him. “Your form. You expect me to believe this is the Avatar of Pride’s only face?”

The jest was meant to lighten the mood, but he didn’t laugh. Instead, he closed the book and turned his gaze on you. His eyes burned a little brighter—sharper. “What you see now is what I allow you to see. There are parts of me not meant for human eyes,” he said softly.

“So you’ve locked those parts away?”

“Not locked,” he corrected you. “Contained. Managed.”

That should have been the end of it but you couldn’t let it go. Not after seeing a flicker of hesitation in his face. Or perhaps it was fear. So you would’ve let it go until you wondered:

What could possibly unnerve Lucifer?

———

The first time he showed you, it was brief. Something of a test.

“Don’t move,” he instructed, “And don’t look away.”

You stood in his study, your heart pounding as he stepped back, seeing his usual form dissolve into something more. His wings expanded, shifting like spilled ink on water. His horns lengthened, spiraling like gnarled roots of an oak tree, and his skin took on a strange sheen, as though it couldn’t decide whether it was flesh or something far older.

But it was his eyes that terrified you. The whites were gone, replaced by an endless, tormenting black. You felt like you were being pulled into them, swallowed by the power of something vast and unknowable.

However, there was also heat that felt familiar, pressing into you like his breath fanning over your skin in the dead of night, when his hands explored every crevice on your body. This form, alien as it was, still carried the same possessive hunger. You had to grip onto the edge of a nearby table to steady yourself.

And then, as quickly as it came, it receded. His wings folded back, his horns shrank and his eyes returned to that familiar crimson. “Enough for tonight,” you were assailed by the sound of his shoes clicking against the hardwood as he made his way to you.

Something, he thought, was not quite right. You were shaken, yes, but not disturbed. He had expected you to avert your eyes, to flinch or look away lest the weight of his true form crush your sanity. Yet you watched him with defiance in your expression and more unsettling still, he found himself watching you back. What was it that kept you here? What had driven you to face something so unnatural and still hold your ground?

———

The second time was different.

You were sitting at the edge of his bed with your legs tucked beneath you. His shirt hung loosely on your frame as the scent of him clung to the fabric. Much like other nights, you’d spent this one wrapped around each other until exhaustion claimed you both.

Lucifer suddenly tugged at his shirt and after your eyes fell on him, you felt something gnawing in your stomach. But you were surprised when he only asked with a casual cadence,

“Do you trust me?”

You nodded like it was perfectly normal to place your earnest trust in a demon like him. You’d already given yourself to him in every way that mattered, baring your soul just as he had bared his body to you time and time again.

Fond with your answer, he stood up and smiled. “Then close your eyes.”

When you opened them, the world felt…wrong.

What you saw had to have been a dream-picture because his form was towering enough to barely fit the space and his wings no longer looked like they belonged to anything earthly. The feathers were shifting, like they had been replaced by shards of black glass catching onto nonexistent light. His horns gleamed like molten metal and his face wasn’t entirely his. It was flickering between the Lucifer you knew and something you couldn’t name but felt in the deepest part of your being.

The diamond on his forehead began to glow, its light blotting shapes in all angles. And then it split, revealing a vertical slit of an unblinking eye that stared into you—not at you, but into you, through you.

Somewhere in between you must’ve hauled yourself onto the floor and stumbled back because your knees were not on the mattress anymore but on wood. A pressure built in your chest but you simply couldn’t look away.

Lucifer didn’t speak, he just watched you like before but this time you felt as though every secret you’d ever buried was laid bare. It wasn’t until he eventually spoke your name that you realised you were crying.

“Breathe,” he said, kneeling before you. His voice was echoing like it was coming from inside you. “I told you it wasn’t meant for human eyes. We can stop.”

“It’s okay, it’s just…a lot,” you said, trembling but not from the cold.

He approached you, his hand eerily warm against your cheek as he wiped your tears and helped you to your feet. “You’re doing better than most would. I’m proud of you.”

“Does it ever hurt?” you swallowed hard, like there was rough rope lodged down your throat. The change was not as graceful as you thought it would be. It came ripping out of him like it was something he constantly suppressed.

“No,” you heard a break of vulnerability in his display. “But it can be lonely.”

“Lonely?”

“It is a grave reminder that demons exist to fear. Sometimes to worship. But never to love.”

Never to love because defending love was what made him this way.

Once respite had settled, a look of sullen reflection had overcome Lucifer’s face, wondering if this left you with little desire to see more.

———

Before the third time came, he warned you about the strain it might put on your mind, “This time might be dangerous.” But you insisted and he remained cautious.

When it happened, it wasn’t in the confines of his room but outside, beneath the yawning void of the Devildom’s starless sky. He told you it would be safer this way. For both of you.

His transformation hit you like a violent wind. Lucifer didn’t just change, he expanded uncontainably into something monstrous, his body shimmering like a dark mirage. His horns were jagged spires, sharp enough to cleave through the Celestial Palace itself and you couldn’t see where his wings ended and began—only that they were folding and unfolding like obsidian knives.

Then, there was his mouth that stretched wider than it should have, revealing rows of teeth too sharp, too numerous. They weren’t made for smiling, they were meant to tear and consume, a predator’s maw lurking beneath his visage. And his eyes—or the absence of them—were blackened husks whilst the unblinking eye on his forehead sat like an all-seeing sigil.

Shadows pulsed into your vision, pooling at your feet and reaching for you like they knew your name. The sheer magnitude of Lucifer’s form left you breathless. If this was the strength of someone who served second to Diavolo, then what maddening power must the Prince of the Devildom truly possess? And beyond even that, the Demon King himself—origin of all darkness. The thought had chills coiling around your spine and you thanked the Heavens he was resting in his indefinite slumber.

Yet strangely, in all that horror, there was beauty. Lucifer’s voice called to you like a melody and his vibrating presence, for all its terror, might have even felt soothing. It was magnificent.

“Are you afraid?” he asked from everywhere and nowhere. A question that wasn’t meant to frighten but rather a lifeline, a chance to retreat before you fell any deeper.��

You should have been. Any rational being would have been. But instead, you took a step closer and reached out to the impossibility of his form. You touched something, though whether it was his face, his chest, or his soul, you weren’t sure.

“No,” you said between awe and surrender. “Never.”

At that moment, you understood what it meant to love a creature who stood at the precipice of an existence that could shatter you with mere thought.

“You are the first to see this and not run. You reach for the flame, knowing it will burn you,” he spoke like the deep roll of a bell.

“How could I not?” You didn’t step back, what was left of your willpower rooted you to the ground. “You’ve never been anything less than this. I could feel it.”

For a fleeting second, you saw the disintegration of his monstrous form, red eyes flickering through black ones as his pride briefly softened in the quiet between you. His wings faltered, a deep inhuman sigh escaping his lips. It was the first time you'd seen him so... uncertain.

“You think you know me so well? They say I am nothing but contradictions. Do you think love could redeem something like me? I could destroy you without meaning to,” this time he laughed but you knew this wasn’t anything he found funny. In fact, it hurt him to think there was any part of him that could cause you to recoil from the truth of what he was.

“But you haven’t because you don’t want to.” Again, his figure quickly distorted into something you were more familiar with. “Has it ever crossed your mind that I never wanted perfection, Lucifer?”

“Then what is it you want from me, if not to run?”

Your heart wound tight, it wasn’t difficult to tell him but you weren’t entirely sure if he’d even believe it. “Just you.”

He said nothing whilst your nostrils flared. “Just you,” you repeated.

Lucifer's unblinking eye narrowed, its glow dimming just slightly as if your words had managed to reach that inscrutable part of him. “You walk the line between courageous and naive, my dear.”

“Then I suppose it’s naive of me to hope you’re walking with me.”

A faint pause. His wings shimmered behind him, his hesitation was palpable but not binding. “If you would dare to take such steps, then you will not tread alone.”

It was resolute, his words settling like an oath.

Curiosity, they said, kills the cat. But in this case, it didn't. It brought you to a place you'd never thought you'd find. Lurking in the darkness of his true form, where love had no place for so long, you found the first glint of light.

A dark, dangerous light, but a light nonetheless.

more a/n: i’m fascinated by eldritch/lovecraftian horror, can you tell?

divider: @/adornedwithlight

networks: @pixelcafe-network @houseofsolisoccasum

tagging you bc you kindly asked eep @sugurouge