The Luminary (H.S. Fic) | Part 1: Light Essence
General Masterlist ANGEL / DEVIL AU (Angel!Harry x Devil!Reader)
Summary: Devils aren’t supposed to go up to Heaven. Devils definitely aren’t supposed to befriend a grumpy angel named Harry. But you were never like most devils—and, honestly, Harry wasn’t supposed to enjoy your company as much as he does.
A/N: I KNOW I literally said I wasn’t going to start another series and would stick to one-shots, BUT I had this idea and couldn’t let it go. I swear after this I’ll behave and go back to one-shots. AND DON’T WORRY—I’ve been writing nonstop since Thursday, so I already have almost half of the story done. (At least 4 parts)
Word count: 2.5k
Warnings: Angel/Devil AU; mentions of Hell, Heaven, demons, angels (all purely fictional—nothing heavy or biblically accurate); mentions of witchcraft, conjuring, etc. (IT’S NOT A SCARY STORY.)
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Heaven was quiet the way it always was: a soft, humming stillness, pale light stretching across the marble corridors. Harry liked mornings like this. Predictable. Controlled. Empty.
He belonged to the Luminary Scholars, an elite circle of angels who existed to illuminate understanding across the celestial hierarchy. His knowledge didn’t just store information—it clarified it. When he entered a room, the atmosphere shifted; even senior angels straightened, knowing his mind functioned at a level few could match.
He was also hypersensitive to every shift in his surroundings, which was exactly why he knew something was wrong the moment the air shimmered behind him.
He didn’t turn. He didn’t have to.
“You couldn’t pick a worse place to break into,” he said, resisting the urge to sigh.
A familiar voice answered, bright and delighted.
“Aw, don’t be grumpy. I missed you.”
Ah, you.
You were a devil of order, not chaos. Your role in Hell was to make sure demons and other infernal beings had the power they needed to do their work. That meant you knew every ritual by heart—conjuring, ancient forces, forbidden prayers, even the precise mix of potions and old witchcraft. You weren’t the strongest, but you were one of the most knowledgeable, the one others came to when they needed something done right. And in Hell, that made you invaluable.
He finally rotated his head—slowly, because giving you immediate attention felt like rewarding bad behavior—and there you were. Leaning against one of the pillars as if you owned the place. Wings tucked tight, a grin sharp as a spark.
A devil. In Heaven. Again.
“Get out,” he muttered. “Before someone sees you.”
“That’s a very dramatic greeting, even for you,” you said, pushing off the pillar and strolling toward him like you had all the time in the world.
He stepped back. Heaven’s light slanted over your shoulders, bending strangely around your shadow-touched aura. Your wings were tucked neatly, not by choice, but in this atmosphere they were shy.
You weren’t supposed to be able to walk this far in; only someone stubborn or reckless could manage it. And you were both.
“You’re reckless,” he said quietly.
“And you’re adorable when you pretend you’re not happy to see me.”
He exhaled hard, jaw tightening. “What do you want?”
For once, your smile faltered—just barely. Then you held out a small glass vial, empty and clean.
“I need more,” you said. “Of the powder.”
“No.” His answer was instant.
“Harry—”
“It’s dangerous. For me to give. For you to use.”
You stepped closer, shadows flickering around your hands where the light didn’t quite touch.
“Please. Just a little. I’ll owe you.”
He hated the way that word pulled at something inside him—something he wasn’t supposed to feel for someone like you.
He looked away. “You shouldn’t come here.”
“But I do.” You tilted your head. “And you always talk to me anyway.”
Silence stretched between you, heavy, humming with something he didn’t want to name.
After several long seconds, he reached into the inner fold of his wing, plucked a single glowing feather, and brushed it lightly between his fingers. Light essence dusted into the vial like falling stars.
He handed it to you, avoiding your eyes.
“Take it,” he said quietly. “And go.”
Your grin returned, brighter than anything in the room. “Knew you’d miss me,” you teased, taking the vial. “Thanks, angel.” Your voice softened for a heartbeat—so quick he barely caught it. “You’re always invited down there, you know.”
“I’m not going to Hell.”
“Everyone says that at first.”
And then, with a ripple of shadow and warmth that didn’t belong in Heaven, you vanished.
His room fell silent again.
Harry stood alone, fingers still glowing faintly from the feather he’d taken… and tried very, very hard not to think about how he already missed you.
.
Getting out of heaven was easier than getting in. Passing through the doors and saying goodbye to the guards was almost fun for you; since you were already headed back down, there was no point in them trying to capture you. They were simply left there, stunned and furious.
Hell was warm — of course — warm and crowded. You walked like you had all the confidence in the world, but the truth was you needed to get to your room quickly. The vial in your pocket was leaking a faint shimmer of light into the air. Demons paused. A few stared at the glow. Light essence didn’t belong here — and some of them knew you were the only one bold enough to bring it.
Then someone stepped in front of you. Your devil wings opened in caution
“Why do you smell like Heaven?”
Liora was a devil whose skin was marked with black sigils that moved like ink beneath the surface. She was calm, sarcastic and pretended not to care, but she’d rewrite an entire demonic contract if you needed her.
She wasn’t just any devil — she was one of Hell’s Contract Weavers, the kind who handled the fine print of damnation itself. Every pact, every oath, every soul-bargain passed through hands like hers. She could read intentions the way others read handwriting; she sensed loopholes before they existed, outcomes before they unfolded. Some said she didn’t just predict the future — she edited it.
Nothing happened in the underworld without Liora knowing first. She always caught the scent of trouble before it took shape. Which was exactly why she could spot Heaven’s lingering trace on you the second you stepped inside.
“I don’t,” you said, continuing your walk.
“Oh yes you do!” Liora reached quickly into your pocket and pulled out the vial. “Oh my god!”
“Liora!” You snatched the vial back, shoved it deeper into your pocket, covered it even more, and kept walking toward your room.
“Where did you get that? … You went there again, didn’t you? You saw him again, right?” Liora said, following close behind.
“It’s getting warmer by the minute here. It’s lovely, isn’t it?” you said, ignoring every word she threw at you as you stepped into your room.
“Y/N! You can’t—” She stopped to close the door behind you both. “You can’t go up there…”
“I know,” you said, placing the vial on your work table.
“Then why did you go again? And why did you talk to him again?” Liora pressed.
“Li… it’s not a big deal. I needed something. Quick and easy. In and out. Sadly, nothing was damaged,” you said with a shrug.
Liora stared at you like you’d just admitted to bathing in holy water.
“Nothing was damaged?” she repeated. “You were in Heaven. You. The walking violation of every border treaty ever written.”
You pulled off your gloves and tossed them onto the table. “Relax. No alarms. No summons from the Thrones. No angry angels chasing me with spears. I was careful.”
“You’re never careful,” she muttered. Then she pointed sharply at the vial. “And that — that is the opposite of careful.”
The vial pulsed faintly, star-dust glitter gathering at the bottom. You could feel the heat of Hell pulling at it, trying to smother it, and the essence pushing back, refusing to dim.
It shouldn’t survive this deep underground.
But it did.
Because it was his.
You turned away before your expression could give you away. Liora, unfortunately, had the observational skills of someone who spent centuries reading half-truths off demon contracts.
She narrowed her eyes. “Oh. Oh no. You’re attached.”
“I’m not,” you said instantly but your wings shivered a bit.
“That was too quick.”
“I’m not,” you insisted, grabbing the vial and adjusting the seal so the glow dimmed.
Liora leaned against your bedframe, crossing her arms. “You keep going up there. You keep coming back with that look in your eyes like you just tasted forbidden fruit and aren’t sure if you want more or want to throw up.”
You rolled your eyes. “I don’t have a look.”
“You do. It’s very annoying.”
You pressed your palms against the table, grounding yourself in the familiar heat of the iron surface. “This isn’t emotional. It’s practical. I needed essence. He had it. Transaction finished.”
Liora snorted softly. “You don’t risk Heaven for ‘practical.’ That realm kills demons for blinking too loud.”
You ignored her and began pulling ingredients from the shelf—obsidian shards, dried drakevine, a strip of fallen-angel parchment from centuries ago. “I have work to do.” “Why don’t you work with the stuff down here, you have everything you need down here, what on hell are you down with light essence?” Liora said “Just a special potion someone asked for” you said hiding the truth “Ugh! and you keep lying, you know what, when you are done lying come back to me…and behave for devil’s sake!”
Liora then stormed out — muttering curses in three dead languages — the room fell quiet.
Not peaceful. Not with the vial glowing like a heartbeat on your table.
You exhaled slowly, dragging a hand down your face. Liora wasn’t wrong. You were lying. And you hated lying to her more than you hated the way your chest tightened every time you remembered the way Harry’s fingers glowed when he crushed light into the vial.
You set the vial in the center of your worktable.
The light essence was already fighting the glass, tiny sparks tapping against the inner walls like impatient fingers trying to break out. Harry’s feather had been too pure, too potent; it wasn’t meant to be contained in anything made down here.
“Stay inside,” you muttered to it, as if reasoning with celestial matter ever worked.
You retrieved a set of iron-bound tongs and lifted the vial carefully. The glow flared, bright enough to throw your shadow against the wall. Even Hell’s heat couldn’t smother it — if anything, it made the essence more stubborn, more reactive. Light hated being underground.
You uncorked the vial only a fraction, the tiniest shift, just enough for a single mote of essence-dust to slip out. It drifted upward like a floating star, resisting gravity, resisting the room, resisting you.
“Down,” you whispered.
It hovered anyway.
Typical. Heaven’s ingredients always had an attitude.
You reached for your tools: a silver-threaded brush, a bowl carved from cooled volcanic glass, a pinch of powdered obsidian that clung to your fingertips like soot. Each movement had to be precise — a breath too sharp or a gesture too fast, and the essence could rupture the mixture entirely.
And blow a hole through your wall.
You coaxed the glowing dust into the bowl, layer by layer, using the brush to guide it. Every speck crackled with soft wheezing light, protesting as you folded it into the shadowy ingredients. The moment light met darkness, the mixture hissed like steam on metal, swirling with a faint, unstable glow.
“Behave,” you warned under your breath.
It didn’t.
The essence pulsed, the bowl shaking faintly, the light trying to detangle itself from the shadows you’d bound it with. You steady your hands and began the next steps: crushed drakevine, a single droplet of nightroot oil, and a spiral traced counterclockwise — not clockwise — to keep the volatile elements from splitting apart.
Your heart thudded once, hard.
This potion wasn’t for a client.
It wasn’t for a demon.
It wasn’t for power.
This one… was for you.
You kept your expression blank, your breathing steady, your hands sure. You never let yourself think too hard while making something delicate. Thinking led to feeling, and feeling led to mistakes.
Slowly, the mixture settled — light glowing beneath shadow, shadow stabilizing the light. An impossible balance, one that should not exist, yet somehow did.
You stared down at it.
Warm. Bright. Dangerous.
A little like him.
You exhaled shakily and reached for the next ingredient. You had a long way to go before it would be finished. And if Liora knew the truth…
Well.
You’d deal with that later.
.
Harry tried to focus on the archives.
Really, he did.
He stood in the vast celestial library—rows of scrolls, tablets, crystalline records hovering in quiet, perfect order—but his mind refused to cooperate. Every time he reached for a document, he saw you. Every time he tried to think of Luminary Scholar protocol, he heard your voice, smug and trouble-warm, echoing at the back of his thoughts.
This was ridiculous.
He ran a hand through his hair, wings tightening in irritation. Angels were not supposed to feel this kind of pull. Not toward devils. Not toward you. Heaven had trained him his entire life to distrust the lower realms, to fear them, to hate them in the quiet, righteous way angels did.
So why did the image of you standing in his chamber—shadow-edged and smiling—refuse to leave him?
And worse… something was wrong.
He could feel it: a faint tug in the center of his wings where he’d plucked the feather for you. A wrongness in the air, like a thread pulled too tight. Light essence was never meant to be held in Hell; its nature resisted, strained, fought. She’s using it, he thought. Or trying to.
He exhaled sharply, forcing his shoulders to relax. Not your concern, he told himself. You gave it to her. It’s hers now. But that didn’t stop the unease curling in his stomach.
He needed a distraction.
He moved through the shelves, scanning labels—Historical Manifestations, Choir Reassignments, Records of Sanctified Geography—until a file caught his eye. Tucked behind pristine scrolls, almost intentionally hidden.
CLASSIFIED: DESCENSIONS / INFILTRATIONS
He froze.
Most angels went their entire existence without even hearing about descensions. Falling wasn’t supposed to happen anymore. And infiltrations… Those were ancient, outlawed practices.
But the label pulsed faintly, reacting to his touch as if recognizing a mind authorized to parse complex knowledge. Against his better judgment, he pulled it open.
Stacks of accounts spilled out—some glowing, some darkened by age.
Case 14-A: Angel attempted voluntary descent. Motivation unknown. Returned after 3 minutes with memory damage. No punishment.
Case 29-C: Two angels collaborated to breach Hell’s borders. Intent: retrieval of forbidden artifact. Both exiled after breaking the protocol.
Case 51-F: Devil manipulated an angelic escort to cross realms. Devil escaped. Angel sentenced to penance.
Harry swallowed.
He read further, scanning descriptions of pathways, loopholes in old treaties, the thin spots in the barrier—old, unstable, fragile.
It made your earlier words echo louder in his mind:
You’re always invited down there, you know.
His hands tightened around the folder.
You couldn’t have meant that literally.
You couldn’t ask him to—
No.
Absolutely not.
He shut the file so fast the pages snapped together. His heartbeat jumped like it was trying to escape his ribs. Going down… that would be madness. Treason. The kind of crime that got angels exiled, wings stripped, name struck from the Choirs.
And yet…
He looked at his wings again, at the faint glow pulsing beneath feathers, tethered to the essence he’d given you. The connection wasn’t supposed to be this strong. He wasn’t supposed to feel anything.
But he did.
He felt you.
Felt the essence resisting something… or someone… or somewhere.
Harry closed his eyes, jaw clenched. He hated how much that scared him.
He hated even more how much he wanted to go after you.
PART 2
