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Published:
2026-03-12
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3,443
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Fire with Fire

Summary:

PWP: Seoryang is poisoned during a fight and the treatment requires dual cultivation...

“Fighting fire with fire, yang with yang; this is also an option.” Lee Cheonsang says. “Rage all you want; I can suppress you.”

Notes:

Inspired by 3TIMEV's wonderful work 梨花新雪海棠红 🛐🛐💖💖. I'm so grateful to the original author for writing and sharing! It was like finding an oasis in the desert... I had to read it with online translator, but it was lovely 🙇‍♀️💕💕

There is no plot here, just raw meat (smut), so the logic may have problems 😂 Warning for OOC.

Terminology
Gyoju-nim: sect leader (with -nim as honorific). In this setting it's technically "Cult Leader".
*Asurascans translates it as "demon lord" and Naver as "my lord" but both are a bit strange in bed so I went with the original Korean...

(See the end of the work for more notes.)

Work Text:

Demon God’s Palace, Seoryang:

“…That concludes my report.” Having finished conveying the urgent matters, all Seoryang wants to do is escape. His condition really isn’t good, demonic qi raging out of control, dense crimson energy wildly saturating the air. Sweat drips from his brow, soaking through his inner robes as his body burns up

It’s all because of that disciple of Kwak Sokyo, that Demon Queen hag. The poison she used brought him to the brink of a qi deviation and has other troublesome qualities, the reason his pants are uncomfortably tight. He didn’t want to appear in front of the Lord like this, but there was information he had to pass on before he could take care of his own matters. “May I be excused?”

“Is that all?” Lee Cheonsang’s tone is inflectionless, his attention not lifting from the missive he started writing on hearing Seoryang’s account.  

“…Yes?” There is no way Lee Cheonsang hasn’t noticed Seoryang’s state, but he doesn’t want to discuss this with him. More to the point, there’s nothing to discuss.

“An excess of yang inciting the Nine Depths Demonic Qi. It would have driven you to deviation, but you stopped the opponent before they reached that point, leaving you in this unstable state,” Lee Cheonsang analyzes, on point as always. “What will you do?”

“The physician said there’s no medicine.”

“And?”

“…There’s no medicine, but there is a treatment. Dual cultivation with Extreme Yin,” Seoryan admits reluctantly. “There isn’t anyone that qualifies who could handle it.” His partner would have to be able to withstand not only the full brunt of the Nine Depths Demonic Qi but also the Demonic Emperor Qi if their spiritual pathways are in direct contact. One demon art is more problematic than the next. Frankly speaking, it’s more likely that the other party would be wrecked.

“The daughter of the Ice Palace might survive.”

Just survive, meaning it would likely cripple her cultivation. “If I have to use one of my people like that,” Seoryang says lowly, “then there is no meaning to everything I have done until now.”

“She might agree to it.”

“Enough!” Seoryang’s voice rises, emotions surging uncontrollably under the influence of the poison. Whether it’s Sangrin or Anghwa, of course he knows they might be willing to go that far, if it’s to save him. That’s the whole reason he snuck away to see the physician at the Blood Spirit Pavilion, like a thief in his own house, hiding the qi disruption from even his faithful friend Ma Dongpil.

“You know I won’t do it, so just get to the point.”

For a few seconds, there is only the quiet swish of brush over paper.

“The treatment, I can handle it.”

Seoryang’s head jerks up, searching Lee Cheonsang’s expression, but the Heavenly Demon is as inscrutable as always.

Lee Cheonsang can’t mean…  “You don’t have Yin energy.”

Finished writing, Lee Cheonsang puts down the brush, folding the page. Dark qi swirls around the missive, sending it to its intended destination, and cold blue eyes lift to meet Seoryang’s gaze. “Fighting fire with fire, yang with yang; this is also an option.” Lee Cheonsang says. “Rage all you want; I can suppress you.”

Seoryang’s skin flares with heat, his breathing quickened. “We’re talking about dual cultivation, right?” he asks doubtfully.

“What else?”

“We’re both men.”

Lee Cheonsang’s expression doesn’t so much as flicker. “Irrelevant.”

It does seem true to Lee Cheonsang’s character to not care about something like this, but it’s still unexpected.

“That would be fine with you?” Seoryang asks, more to buy time to think than anything else. “Between two men… are you even interested?” Fuck. He hadn’t meant to say the last part.

“I find you interesting,” Lee Cheonsang says, striking directly at the heart of the issue. “Gender is inconsequential.”

Seoryang swallows thickly.

Laying down for Lee Cheonsang. It’s just for medical treatment, but is something like this okay?

“It’s an offer, no need to complicate it,” Lee Cheonsang says. “The consequence of not taking treatment is damage to your cultivation that would require ten years of recovery, five if I intervene.”

Seoryang’s cultivation would be crippled. His emotions and thoughts are a jumbled mess, but five years is too long. He has reservations about doing this with Lee Cheonsang, but not to that extent.

He.. wants this, and Lee Cheonsang is willing.

It’s just sex, not even something to be endured.

**

…Is what Seoryang thought, but the act itself is more mortifying than he imagined.

Seoryang’s out of control demonic qi is no longer a problem. Not since Lee Cheonsang let out his Demonic Emperor Qi, the dense power rolling out to blanket the room, thickening the air until it was difficult to breathe. Seoryang has come a long way, able to suppress most others himself, but Lee Cheonsang’s dark spiritual pressure is immense, stifling his crimson demonic qi until it can only struggle weakly, rebellious but futile, unable to act out.

It’s the rest that Seoryang finds difficult to endure. They are in the Heavenly Demon’s bedroom, the paper lamps burning low. Lying on gold silk sheets, Seoryang’s legs are to either side of Lee Cheonsang, the lord of demons preparing him to receive.

When he first undressed, Seoryang told Lee Cheonsang “you can just put it in”, wanting to have it over and done with. Lee Cheonsang didn’t answer him with words. He simply disrobed, letting Seoryang see for himself. At nearly seven feet tall, Lee Cheonsang is huge, tall body and broad shoulders with a magnificent physique.

And… that part of Lee Cheonsang is proportional, as unfortunately impressive as the rest of him.

Which is why Lee Cheonsang is currently two knuckles deep inside Seoryang, the slick sounds of oil on flesh as his entrance is worked open. It feels strange, but the toxin has made his body sensitive, every caress of those long fingers along his inner walls sending shivers of pleasure down to his toes. Precome dribbles from the head of his cock, his skin heated with desire.

The effects of the venom creep into his consciousness, blurring the edges of his self-awareness, eroding his inhibitions. He wants to spread his legs wider, wants to rock down onto Lee Cheonsang’s hand and fuck himself open. He struggles to rein in the humiliating desires, panting for breath as he tries not to moan. Unable to look at the other, he turns his head to the side, an arm thrown over his face.  

The fingers moving inside him slow, then withdraw.

Is Lee Cheonsang already going to put it in? That… doesn’t seem to be enough for the size of that thing. Seoryang steals a glance at the other person, only to find Lee Cheonsang already looking at him.

Lee Cheonsang’s clean hand closes over Seoryang’s wrist, moving the covering arm to the side, exposing Seoryang to his gaze. The other palm rests on Seoryang’s thigh, a brand of proprietary heat.

Gyoju-nim?”

“Don’t conceal yourself.”

Seoryang stares. He really wants to tell Lee Cheonsang: counting my past life, this is the soul of a middle-aged man about to be fucked for the first time. Can you spare me this once, gyoju-nim?

Lee Cheonsang releases his wrist, hand drifting over to trace the stain of red on Seoryang’s cheeks. “So you know shame.”

“What kind of comment is that,” Seoryang mutters, not knowing how to react to the almost tender gesture. He doesn’t even know why he is getting worked up over this.

No… he does know why. Intimate relations are not the issue. It’s because of this person, his complicated emotions for him thrown into further disarray by the poison. “It’s a trivial matter.” That should be the case for Lee Cheonsang, the half-immortal who can rightfully be called a Demon God, a being who has seemingly shed his humanity, and earthly desires with it.

“It’s trivial,” Lee Cheonsang agrees. “But it’s not trivial to you, nor is it to me.”

It isn’t… to Lee Cheonsang? As incomprehensible as Lee Cheonsang is, he has always been a pragmatic person. Administer the treatment and move on—that’s what Seoryang expected. Not… this.

“I’m the problem,” Lee Cheonsang concludes with that frightful perceptiveness of his.

Seoryang has nothing to say to that.

“The path to ascension requires that you fully experience the five desires and seven emotions, first achieving harmony as a human in order to cast off worldly concerns.”

Right… Seoryang remembers that lesson.

“Since you haven’t experienced sensual pleasure before,” the hand on Seoryang’s thigh drags a slow, hot path over his hip, skirting tantalizingly close to his dripping arousal without touching it, “why not immerse yourself in this desire now?” Lee Cheonsang’s palm splays over the skin of Seoryang’s pelvis like a claim, nearly spanning from one side to the other.

With induced lust broiling in his veins, it’s all Seoryang can do not to push into the touch, to drag Lee Cheonsang down and make him stop talking. And Lee Cheonsang wants to give him a lesson under these circumstances? Unbelievable. He even discerned that it’s his first time… Seoryang isn’t even surprised anymore. “Why do I feel like you have other intentions?” Whether Lee Cheonsang is acting as a lord or a god, he has the bad habit of instigating Seoryang just to see his reaction. Isn’t this the ideal setting to do that as much as he likes?

“Mm. Well, you aren’t wrong.”

Seoryang thumps his head against the pillow, staring at the canopy above. What’s wrong with this guy?

“It’s been some time since you hid yourself from me,” Lee Cheonsang comments. “I’m somewhat unused to it.”

“You never talk this much when it’s not about cultivation,” Seoryang retorts. “I’m also somewhat unused to it.” But… he’s noticing it now. It’s not just him that’s restless.

“What you’re concerned about; they’re useless worries,” Lee Cheonsang says, watching him intently. “My opinion of you can’t be changed by something like this. As long as you are true to yourself, I won’t tire of you.” Leaning down, he takes Seoryang’s lips, the movement slow. The long strands of his hair fall forward like a curtain of silk, shading out the light.

Breath hitching, Seoryang lets Lee Cheonsang coax his mouth open and kiss him more deeply. Attention tunneled down to the slick, unhurried exploration of each other’s mouths, he doesn’t realize his legs have unconsciously drawn up, hooking around Lee Cheonsang’s waist to bring him closer. Being kissed by this person is so inconceivable to Seoryang that he almost wonders if it’s a hallucination, if he’s already in qi deviation.

When they part, Seoryang’s face is flushed, his chest heaving.

“Do you want this?” Lee Cheonsang asks in a deep voice, so close Seoryang can feel the other’s breaths on his lips.

“…I do,” Seoryang admits hoarsely.

Lee Cheonsang rewards him with another kiss. A fast learner, Seoryang doesn’t passively receive this time, turning the kiss aggressive, vying for control. His demonic qi surges in response, roiling restlessly beneath the domineering oppression of Lee Cheonsang’s power. The palm on Seoryang’s pelvis moves down to fist his cock, thumb teasing the leaking slit until Seoryang is arching into the touch, moaning into Lee Cheonsang’s mouth. He is allowed a single gasp of air before Lee Cheonsang dives in to steal his breath again. It doesn’t take much before Seoryang is spilling over into Lee Cheonsang’s hand with a muffled cry, white liquid spurting onto the ridges of his abdomen.

“Yes,” Lee Cheonsang says, the cool silver-blue of his eyes no longer calm, “I am the same.”

This time, when Lee Cheonsang moves down to push three fingers into his hole, Seoryang opens for him, pliant in the afterglow, drugged with sweet kisses. The sudden stretch stings, but Lee Cheonsang rubs over a spot inside that lights up Seoryang’s nerves. His thighs tense at the shock of pleasure, knees digging into Lee Cheonsang’s sides.

The strain is greater when it comes to the main event, Lee Cheonsang lining himself up. The thick head breaches Seoryang in a shallow thrust, and gradually presses in, parting his flesh as it goes, the virginal passage worked opened with small, patient motions. Seoryang gasps and writhes beneath Lee Cheonsang, feeling as if he’s being split open. But there is also a hot, searing pleasure to it that drives his arousal higher, especially when Lee Cheonsang grinds over that spot inside. Groaning, his spine bows, heels digging into Lee Cheonsang’s back. “Hurry up,” he demands, power flaring erratically as the unnatural craving to be filled overrides both pain and sense.

“…Hurry up?”

The odd tone is the only warning Seoryang gets before Lee Cheonsang bottoms out in a single thrust. It wrings a cry from his throat, nails raking bloody furrows down Lee Cheonsang’s back as physiologic tears spring to his eyes.

“Hm.” Lee Cheonsang studies his dazed expression. “I was being careful, but I guess I don’t need to be so careful with you.”

Sixth sense prickling with danger, Seoryang rushes to say, “Wait, gyoju-nim—Ah—!

Lee Cheonsang tilts Seoryang’s hips up with one hand, the other palm laying over his core as he steadily drives into his body. “Circulate.”

It’s impossible to get used to, with Lee Cheonsang mercilessly targeting the spot that sends waves of pleasure through him, making his toes curl.

“Concentrate,” Lee Cheonsang chides.

Dammit, this bastard—!

Following Lee Cheonsang’s instructions, Seoryang passes his chaotic, tainted qi to him. On making the connection with the other, he immediately understands why gender is irrelevant. Seoryang’s corrupted qi is no more than a cupful of water, poured into the vast, boundless ocean of Lee Cheonsang’s qi. The Heavenly Demon’s power is a deep sea without end.

“—to the danjeon meridian—” Lee Cheonsang continues to murmur instructions to Seoryang, his fingers tracing the path on Seoryang’s skin, even as he soundly fucks him into the mattress. All the while, he sends his own clear, refined demonic qi into Seoryang’s meridians, the purity unmatched.

Seoryang’s body is driven to the peak of ecstasy, so intense it borders on pain, while his vessels are continuously infused with potent, undiluted demonic power. The violent turbulence in his qi is forcibly subsumed beneath the absolute dominance of Lee Cheonsang’s Demonic Emperor Qi. The combined chaotic sensations of body and spirit are overwhelmingly intense, wiping every last thought from Seoryang’s mind. Feeling as if he is simultaneously soaring and dying, he doesn’t know anything except the deep voice in his ear, guiding him through the wind and waves.

They change positions several times, Lee Cheonsang arranging Seoryang’s limbs to his liking. He puts Seoryang on his knees, face pressed to the sheets, driving in deeper, slow and relentless; then carries Seoryang in his arms, head lolling back on Lee Cheonsang’s shoulder as his body is plundered at a punishing pace—

**

Heavenly Demon’s Residence, Lee Cheonsang:

Inhibitions crumbled away, Seoryang’s moans are wanton, his eyes glassy and his mouth hanging open, saliva trailing from the corner of his mouth. Consumed by pleasure, his body opens beautifully for Lee Cheonsang, hips rolling sensually as he moves with him.

With Seoryang’s usual willfulness, and the strength and endurance of a martial artist at the Ultimate Demon Realm, this sweet yielding is not something that can be achieved with normal methods. Getting to see this view is a result of that poison and some additional effort. It’s a shame that the poison’s effects are crippling; he wouldn’t mind having Seoryang like this again.

Trembling in Lee Cheonsang’s arms, Seoryang’s body abruptly pulls taught, head thrown back and legs clamped around Lee Cheonsang’s waist as he climaxes. His cock jerks, but he has already been fucked dry, a pitiful amount of clear fluid dribbling out. Lee Cheonsang fucks him through it, Seoryang whimpering and clinging to his shoulders. Nearing his own peak, the snap of Lee Cheonsang’s hips turns erratic, and then he is hilting himself deep, pouring his seed into that deepest place.

When Seoryang reaches for him, Lee Cheonsang obligingly leans down for a kiss, indulging him. While Seoryang tangles their tongues, Lee Cheonsang circles his wrist with his fingers, sending in his qi to check his circulation. The poison had been oddly persistent, sticking to Seoryang’s vessels with annoying tenacity, but the last of it has finally cleared.

That’s done then, Lee Cheonsang thinks, wiping the tears from Seoryang’s face with his fingers. He is about to pull out when Seoryang mumbles something that has him going stock still.

Up to this point, Seoryang has been calling him gyoju-nim. But now, strung out and near delirious, his insolent disciple says, “Lee Cheonsang,” squirming beneath him and tugging at him pleadingly. When Lee Cheonsang dazedly lets himself be pulled, Seoryang loops his arms around his neck, hugging him close for a kiss. “Cheonsang,” Seoryang murmurs against his lips, pleading, and Lee Cheonsang’s control snaps. Gripping Seoryang’s chin, he tilts him for a devouring kiss.

“I was going to let you off,” Lee Cheonsang says hoarsely, feeling Seoryang shiver around him, warm and inviting. “Provoking me like this…” His hands slide down Seoryang’s thighs, feeling the muscles quiver beneath his fingers as he pushes them up and out, “you’ll have to bear the consequences, Seoryang.”

**

Young Leader’s Residence, Anghwa:

Sweeping the courtyard as is her morning routine, Anghwa can’t help but fret about her young master. This is the third day since Seoryang returned to the cult from his outside mission, and she has yet to see him. She did receive a letter from the Demon God’s Palace informing her that Seoryang was receiving treatment there, and would be delayed, but she can’t help but worry. If it was any place else, she would be hovering on their doorstep to wait for the young master, but the Demon God Palace isn’t a place where just anyone can go.

Sighing, Anghwa puts away the broom. Maybe she could send a letter or inquire with guard Dongpil…

The little maid is debating the best course of action when she walks into the young master’s room to do the daily cleaning. Opening the door, she nearly has a heart attack on seeing a tall person in the room, dressed in a long black robe, and lets out an alarmed squeak. She didn’t even sense anyone in here! It takes a moment for her to realize who it is: the cult leader, the Heavenly Demon. And he is carrying someone in his arms—

“Young master!” To Anghwa’s relief, Seoryang looks healthy, if tired, wrapped in a plain white robe. Belatedly recovering her senses, she hurriedly falls to her knees. “The Divine Cult’s teachings are absolute! All demons prostrate before you! This servant, Anghwa, pays respects to gyoju-nim.”

“Mm.”

The lord walks to the bed, a rustle of sheets as he lays Seoryang down.

Anghwa cautiously asks. “Gyoju-nim, is young master alright?”

“He’s fine. Let him rest until he wakes.”

The lord’s tone is impassive, but something in his voice gives Anghwa the strange impression that he’s… in a good mood? Her contemplation is interrupted by a fancy jade wine bottle that floats down to her.

“Take it.”

Anghwa hurriedly receives the bottle with both hands. “Gyoju-nim, this is…?”

“Medicinal wine. Tell Seoryang if he likes it… he can come find me for more.” With a swish of his robes, the lord is gone.

If the young master likes the medicinal wine?

Anghwa tilts her head in perplexity, carefully examining the precious bottle.

Is medicinal wine supposed to taste good?

**

Young Leader’s Residence, Seoryang:

Seoryang wakes in his own bed with no inkling of how he arrived there. Lee Cheonsang must have brought him back. He feels… pretty good actually, considering how he was tossed about for what seemed like an eternity. As if triggered by the thought, a few memories trickle in. Instantly, Seoryang’s ears go hot, burying his face in the pillow with a groan.

Lee Cheonsang fucked him until he couldn’t even get hard anymore. Is that guy a beast?!

After trying and failing to exorcise the lewd memories, Seoryang drags himself up to sitting. He’ll just check his condition and then go find Anghwa. Crossing his legs, he closes his eyes and circulates his qi.

…!!

That can’t be right.

…Did dual cultivating with the lord of demons have benefits? He thought that only worked with yin-yang cultivation pairs.

Brow furrowing, Seoryun checks again, but the results are the same, leaving him speechless. A hefty increase in his Demonic Emperor Qi, of peerless purity… Lee Cheonsang nearly fucked him into a new realm! Crazy…!

Notes:

Thank you kindly to everyone who commented, kudos'd, or even just read this work. Everyone's kind comments gave me the courage to leave this up, so it will be staying :)