Incendiary
pairing: ⸝⸝ Diluc Ragnvindr x Fem! Reader ⸝⸝
word count: 2.1k (2,158)
warnings: SMUT ahead, explicit depictions of oral sex and suggestive themes, power dynamics, public/semi-public s3x, alcohol consumption, dubious consent, size difference, rough intimacy (he's down bad for you), secret relationship(?)
The moon hung low and heavy over Mondstadt, a silver coin tossed against the raven black of the night sky. Behind the Angel’s Share, the world felt smaller, reduced to the rough texture of brick against your back and the overwhelming heat of the man pressed against you. The muffled sounds of laughter and clinking glass from inside the tavern were a distant sound, drowned out by the heavy, uneven thrum of your own heart and your shared breathing.
You were exhausted. Being Varka’s right hand wasn't just a title; it was a relentless cycle of managing the logistics for the expedition in the frozen wastes of the north while simultaneously acting as the backbone for Jean here. Your days were spent buried in maps and casualty reports, your nights spent ensuring the Knights didn't crumble under the weight of their own bureaucracy. But here, in the shadows of the back alley, you didn't have to be the pillar of the Ordo Favonius. You didn't have to be anything at all.
Not when Diluc’s hands were on you before you could catch your breath.
They weren't gentle. He gripped your waist with a ferocity that bordered on desperation, his fingers digging into the leather and fabric of your uniform as if he were trying to anchor himself to you. He had always been a man of controll, but when it came to you—to this—the control always seemed to burn at the edges.
"You smell like the office," he murmured, his voice a low, gravelly vibration that sent a shiver straight down your spine. Not sure if that fact turn him off but he didn't wait for a response. His mouth was upon you, crashing against yours in a kiss that tasted of sweet grape juice and the dark, smoky heat that seemed to follow him everywhere.
Just like his grip on your waist, the kiss wasn't either. You let out a muffled moan, your fingers tangling in the thick, unruly red silk of his hair, pulling him closer until there wasn't a single breath of air between you.
This was the only place you could be this honest, this raw. You’d grown up together, chasing each other through the vineyards of the Dawn Winery with wooden swords, sharing secrets and your dreams. Now, you shared this: a frantic, periodic hunger that neither of you knew how to name, but that fact stopped neither of you.
Diluc groaned into your mouth, a sound of pure want. He shifted his weight, and suddenly, he was hiking his thigh up between your legs, his knee pressing firmly into your heat through the layers of your uniform. The friction was sudden, making your head snap back against the brick wall. You gasped, your eyes fluttering shut as a jolt of electricity raced through you.
"Diluc," you breathed, his name a plea and a challenge all at once.
"Shut up," he whispered, though there was no real bite to it. He was too busy trailing his lips down the column of your throat, his teeth grazing the sensitive skin right above your collarbone. "For once, just stop thinking about the Knights. Stop thinking about Varka. Just stay here- with me."
He moved his hands from your waist, one sliding up to cup the back of your head, his leather-gloved fingers weaving through your hair to hold you still for his onslaught. The other hand stayed low, pinning your hip against the wall while his leg continued that rhythmic, torturous pressure against you. Every time he shifted, every time his thigh pressed upward, you felt your world tilting on its axis and the heat growing down there increase with every movement.
As a Pyro vision holder, he always ran warm, but in moments like this, he felt like a literal furnace. A stark contrast to the cold stone at your back and the chilly night air biting at your exposed skin. You felt like you were melting into him, your body instinctively molding itself to his larger, harder frame.
You managed to get one hand free, sliding it beneath his vest, feeling the solid, rippling muscle of his chest through his shirt. His heart was hammering just as fast as yours, a frantic rhythm that betrayed the stoic, calm mask he wore for the rest of Mondstadt.
He pulled back for a second, his chest heaving, his eyes dark and blown wide with a heat that had nothing to do with his vision. He looked at you with a mix of frustration and another emotion you couldn't put your finger on that made your stomach do flips.
"You're going back to the headquarters after this, aren't you?" he asked, his voice barely a whisper.
"Eventually," you said, your voice sounding foreign and wrecked to your own ears. "The morning reports—"
He didn't let you finish. He captured your lips again, fiercer than before, as if he could kiss the duty right out of you. His hands moved with a renewed urgency, roaming over your body with a familiarity that only years of friendship—and months of these secret encounters—could produce. He knew exactly where to grab, exactly how much pressure to apply to make you lose your mind.
When his thigh pushed up against you again, harder this time, you couldn't help the high, needy sound that escaped your throat. You arched into him, your nails digging into his shoulders, trying to get even closer.
It was intoxicating- He was intoxicating. For a few more minutes, the Knights didn't exist. The expedition didn't exist. There was only the weight of his body, the strength in his hands, and the fire that threatened to consume you both right there in the dirt and the dark.
He slowed down just a fraction, his forehead resting against yours as you both struggled to find oxygen. His thumb traced the line of your lower lip, which was swollen and red from his attention.
"One of these days," he muttered, his breath hot against your face, "I’m not letting you go back."
You smiled, a small, tired thing, and reached up to cup his face. "Yes, you will. You're just as stubborn about your work as I am."
He let out a huff of a laugh, a rare, genuine sound that softened the sharp lines of his face. He kissed your forehead, a lingering, surprisingly tender gesture that hurt more than the biting kisses did. Then, as quickly as the fire had flared up, he began to pull back, rearranging his coat and mask, the walls going back up before your very eyes.
"Go," he said, though his hand lingered on your waist for one last second. "Before Jean sends a scouting party to find her best officer."
You straightened your uniform, your body still humming from his touch, the phantom pressure of his thigh still burned into your memory. You stepped out of the shadows, looking back one last time to see him standing there, a dark silhouette against the tavern lights. You knew you'd be back.
Because in a world of ice and duty, Diluc Ragnvindr was the only thing that actually kept you warm.
The morning had come far too early, the sun bleeding through the windows of the Knights of Favonius headquarters like a personal affront. Your head had throbbed with the ghost of Diluc’s touch, but there was no time to dwell on the heat of the previous night. Duty waited for no one—even if that duty involved babysitting the Spark Knight.
By mid-afternoon, you were covered in soot, lake water, and regret. Klee had that look in her eyes—the one that promised explosive results—and somehow, she had convinced you that "fish blasting" was actually a sanctioned ecological survey requested by the biology department. You’d been standing on the shore of Cider Lake, watching a particularly large trout achieve orbit, when the shadow of the Acting Grand Master fell over you. Jean didn't need to yell. She had just pointed toward the headquarters with a look of profound, soul-deep disappointment.
That was how you ended up spending four hours in solitary confinement, sitting on a tiny wooden stool next to a very energetic Klee, who spent the entire time explaining the different fuse lengths of her "treasures."
By the time you were released, your nerves were frayed to a thin wire. When Kaeya and Rosaria cornered you near the fountain, suggesting a "debrief" at the Angel’s Share, you didn't even put up a fight. You needed a drink. Just one.
The tavern was packed per usual, the air thick with the smell of roasting meat and fermented grain. Diluc was behind the bar, his expression as unreadable as a closed book, though his eyes followed you the moment you stepped through the door with the Calvary Captain and the sister of the Church. He took in your wrinkled uniform and the smudge of ash on your cheek, his jaw tightening almost imperceptibly.
"The usual for the hero of the hour," Kaeya teased, sliding onto a stool and gesturing for Charles to bring over a round. "I heard you and Klee had quite the afternoon. Jean looked like she was about to develop a permanent twitch."
Rosaria leaned back, her sharp eyes scanning the room. "Better her than us. Drink up. You look like you need it."
Now the problem was, you were a legendary lightweight. It was a well-kept secret among the higher-ups, mostly because you usually had the sense to stick to grape juice when Diluc was watching. But tonight, the frustration of the day won out. You took a long, heavy pull of the Death After Noon Kaeya had ordered, and within twenty minutes, the world began bleeding into pretty colors.
The chatter of the bar became a dull roar. The warmth of the room intensified, turning your skin flush. You felt heavy, your limbs turning to lead, and eventually, you couldn't keep your head up anymore. You folded your arms on the wooden surface of the bar and buried your face in them, letting out a soft, incoherent groan.
"Oh, dear," Kaeya chuckled, though there was a note of genuine surprise in his voice. "I didn't think one glass would do it. Hey, little Knight, still with us?"
A shadow fell over you, blocking out the light of the chandeliers. You didn't need to look up to know who it was. The air around you suddenly smelled like cedarwood and grape juice.
"She’s done," Diluc’s voice cut through the noise, cold and final. "Kaeya, Rosaria—stop plying my customers with drinks they can’t handle."
"We didn't force her," Rosaria pointed out, though she sounded bored. "She’s just... efficient at getting drunk."
"I’ll take her out back," Diluc said, his voice dropping an octave. "She needs fresh air before she ruins my upholstery."
You felt his hands on you—strong, sure, and much more careful than his words suggested. He hauled you up, tucking your arm over his shoulder. You stumbled along, your head lolling against his shoulder, your senses overwhelmed by the heat of his body. He steered you toward the back door, the one leading to the same alleyway where he’d had you the night before.
The cool night air hit you like a physical slap, but it didn't clear your head. If anything, it made the spinning worse. Diluc led you to a crate, but you didn't want to sit. You felt a surge of drunken boldness, a reckless fire sparked by the friction of his clothes against yours.
As soon as the door clicked shut behind you, you turned into him, your hands clumsily grabbing at his vest. Diluc let out a huff of surprise, his back hitting the brick wall with a dull thud as you stumbled into him.
"Steady," he muttered, his hands coming up to grip your shoulders to keep you from falling. "You'll make a scene, even out here."
"I hate the Knights," you mumbled into his chest, your voice muffled and thick. "I hate fish. I hate solitary confinement."
"I know," he said, his voice softening just a fraction. He went to shift you, probably to lead you back to the winery where you could sleep it off, but you weren't finished.
The alcohol had stripped away your filter, leaving only the raw, pulsing hunger from the night before. You looked up at him, eyes glazed and your lips parted. You saw the way his gaze dropped to your mouth, the way his throat worked as he swallowed hard.
You slid down. It wasn't a graceful movement; your knees hit the cobblestones with a soft thud, but you didn't care. You stayed there, kneeling between his boots, your hands roaming up his thick thighs. Through the dark fabric of his trousers, you could feel him—and the unmistakable, growing hardness that belied his calm expression.
Diluc froze. "What are you doing?" he hissed, though his hands didn't push you away. Instead, they tangled in your hair, fingers twitching. "You’re drunk. Stop this."
You didn't listen. Your fingers were clumsy as you began to paw at the fastening of his pants, your touch frantic and demanding. You wanted him—not the wine-tycoon, not the hero, just the man who looked at you like you were the only thing in the world that mattered.
"I mean it," he whispered, his voice shaking now. He placed a hand over yours, a soft, half-hearted attempt to usher you to stop. "Don't. You won't remember this in the morning."
But you could feel him. Even through the layers of cloth, he was rigid, twitching against your touch. You leaned forward, pressing your cheek—and then your entire face—right against the center of his bulge.
"You're telling me to stop," you murmured, your voice vibrating against him, sending a visible jolt through his entire frame. You looked up at him through your lashes, a wicked, lopsided grin tugging at your lips. "But he’s saying otherwise."
Diluc’s head snapped back against the wall, a strangled, broken groan escaping his lips. His grip on your hair tightened, not to pull you away, but to hold you right there. The "fresh air" had done nothing to cool the fire; it had only given it room to burn.
"You're going to be the death of me," he whispered into the night air, his eyes snapping shut as he finally let go of the last shred of his legendary restraint.
He didn't pull you up. Instead, he reached down, his leather-gloved fingers finding your chin and tilting your head back so he could see the sheer, drunken devotion in your eyes. The alleyway was silent, save for the sound of his heavy, labored breathing and the distant, muffled music of the tavern.
You were still on your knees, the rough cobblestones biting into your skin, but you hardly felt the sting. The wine was a buzzing hum in your ears, stripping away the poise of a high-ranking Knight and leaving only the raw, pulsing need to please the man towering over you.
Diluc looked down at you. His hair had come loose from its tie, fiery strands falling over his eyes, which were dark with a hunger he usually kept locked behind iron gates. When you pressed your face against his trousers again, feeling the heavy, rigid length of him through the fabric, a low, guttural sound escaped his throat—a sound that wasn't the refined Master of the Winery, but the man who had been wanting you since you were both old enough to understand what wanting meant.
"You have no idea what you’re doing," he rasped, his voice cracking. It was a warning, a final plea for sanity, but his hands were already moving.
His fingers dove into your hair. He gathered the tresses together, fistfuls of your hair becoming a makeshift ponytail that he used to tilt your head back, exposing your throat to the moonlight. The grip was firm, bordering on painful, but it grounded you. It told you exactly where he wanted you.
With a confident yet trembling hand, you worked the fastening of his trousers. The leather and heavy fabric gave way, and when he finally sprang free into the cool air, you let out a small, shaky breath. He was magnificent—thick, twitching, and radiating that signature Pyro heat that seemed to turn your blood into liquid gold.
You didn't hesitate. You were inexperienced, your movements clumsy and guided more by instinct than knowledge, but the alcohol gave you a fearless edge. You leaned forward, your tongue darting out to lick at his tip, the taste the salt and the faint, musky scent of him filling your tastebuds. Diluc’s hips lurched forward involuntarily, his breath hitching in a sharp, ragged sob of air at the contact.
When you finally took him into your mouth, the sensation was overwhelming. He was so much larger than you’d imagined, filling your mouth completely, stretching your lips as you struggled to accommodate him. You looked up at him, your eyes watering from the sheer size of him, but you refused to back down. Instead, you pushed further.
Diluc’s hand tightened in your hair, his knuckles white as he guided your head. He expected you to recoil, to choke as he pressed deeper, but you didn't. You took him in, deeper and deeper, your throat opening up with a natural ease that seemed to shock him. There was no gagging, no hitch in your breath—just the wet, rhythmic slide of him disappearing into you.
"Archons," he choked out, his head slamming back against the brick wall again. "You... you're incredible (Y/N)."
The praise only made you bolder. You began to move your head in earnest, hands gripping his strong thighs for leverage. You weren't practiced, so you made up for it with enthusiasm, using your tongue to swirl around the head before sinking back down until your nose pressed against his dark curls.
Rivulets of spit began to run down your chin, glistening in the faint light from the moon that peaked through clouds, threatning to expose you to anyone that might pass by, but neither of you cared about that right now. This was messy and desperate. Diluc’s breathing turned into a series of broken groans, his hips beginning to meet your thrusts with a frantic, uncoordinated rhythm of his own.
He was losing his mind. You could see it in the way his eyes rolled back, the way his usual stoic composure had disintegrated before your own eyes. His grip on your hair shifted, your hair falling messily against your back as his palm pressed against the back of your head to urge you faster, deeper. The heat coming off him was intense now.
"Faster," he pleaded, his voice a wrecked whisper. "Please, just like that."
You picked up the pace, your throat slick and welcoming. The sound of it—the wet, slapping noise of your lips against his skin—continued to fill the quiet of the alleyway. You were focused entirely on him, on the way his muscles corded in his legs under your palms and the way his hands shook as they held you in place.
Diluc’s movements became more erratic, his thrusts losing their rhythm as he neared the edge. He pulled your head back for a second, looking down at you with a face full of love and pure, unadulterated lust.
"I'm not going to be able to stop," he warned, his voice thick.
You didn't give him a verbal answer. You simply looked him in the eye, reached up to swipe a stray drop of saliva from your lip, and took him back in, even deeper than before.
The end came in a rush of heat and a strangled grunt that Diluc stifled by biting his own lip. You felt the surge of him, the hot, heavy release filling your mouth, but you didn't pull away. You held him there, swallowing every drop with a devotion that made his knees finally give out.
He slumped against the wall, sliding down until he was sitting on the ground in front of you, his chest heaving as he fought for air. He looked completely undone—clothes disheveled, hair a mess, and his eyes finally clearing as the haze of pleasure began to recede.
For a long moment, there was only the sound of your shared, ragged breathing. You sat back on your heels, wiping your mouth with the back of your hand, the alcohol finally starting to settle into a warm, sleepy glow.
Diluc reached out, his hand trembling as he tucked a lock of hair behind your ear. He didn't say anything at first; he just looked at you with an intensity that made you feel more seen than you ever had in the bright lights of the Favonius headquarters.
"Fresh air," he finally managed to say, a ghost of a smirk playing on his lips despite his exhaustion. "I'm a terrible liar."
You leaned into his touch, your head heavy. "And a very loud wine tycoon."
He laughed then—a real, chest-deep laugh that made the stress of the day feel a million miles away. He tucked himself back into his trousers before pulling you into his lap, wrapping his heavy coat around you both, shielding you from the cold.
Behind the Angel’s Share, amidst the scent of wine and woodsmoke, the Right Hand of the Knights and the Master of the Winery finally found a moment of peace, anchored to each other in the quiet dark.














