The forest clearing glowed under the full moon, the air thick with the scent of pine and distant battle smoke.
Kyojuro Rengoku had been patrolling alone after a grueling mission when he heard soft, pained sounds coming from a small cave. He rushed in, flames flickering along his Nichirin blade, ready for a possible demon ambush.
Instead, he found her; Nezuko Kamado, no longer the small box-dwelling girl.
She had grown into her adult demon form during a recent fight: taller, with fuller curves, long wavy black-to-flame-orange hair cascading down her back, a single elegant horn curling from her forehead, and delicate pink vine tattoos tracing her arms and thighs. Her pink kimono was torn and bloodstained from the battle, clinging to her generous breasts and wide hips.
"Nezuko!" Rengoku called out, voice warm and concerned as always. "Are you hurt? That was a fierce battle you fought back there. Your brother would be proud!"
Nezuko looked up at him with those big, expressive pink eyes, now framed by a more mature, beautiful face. She couldn't speak, but she nodded, then winced as she tried to stand.
A deep gash on her side was healing slowly, and the pain made her body tremble. Without thinking, she stumbled forward and pressed against his broad, muscular chest, seeking comfort like she once did with Tanjiro.
Rengoku froze for a second, cheeks flushing bright red under his wild yellow hair.
"Young Kamado! This... this is improper! You are a lady now, and I am a Hashira. We must maintain decorum!"
But Nezuko didn't pull away. The adrenaline from the fight mixed with her demonic instincts had turned the pain into a different kind of heat. She nuzzled closer, her soft breasts squishing against his hard abs, a tiny needy whimper escaping her lips. Her small hands clutched his uniform, and she looked up at him with hazy, pleading eyes.
Rengoku's golden eyes widened. The Flame Hashira was all passion and heart. He couldn't ignore someone in need, especially not this brave young woman who'd fought so fiercely beside him.
"If... if it eases your suffering, then allow me to help you, Nezuko! With all my fiery spirit!"
Nezuko rose on her toes and pressed her lips to his in a clumsy but eager kiss. Rengoku hesitated only a moment before kissing her back fiercely, his big hands settling on her waist as the heat between them exploded like one of his breathing forms.
Rengoku pulled back from the kiss, breathing heavily, his usual bright smile turning into something hungrier.
"Nezuko... you're so beautiful like this. Your strength, your spirit; it sets my heart ablaze! But if we're doing this, I want to make you feel incredible."
Nezuko let out a soft, breathy "Mmmh~" and nodded, her fangs peeking out as she smiled shyly. She sank gracefully to her knees on the cave floor, hands already tugging at his pants with surprising strength.
When his thick, heavy cock sprang free, long, veined, and already rock-hard with a flushed tip, her eyes lit up with pure demonic curiosity and desire.
"Ohhh.. so big..."
She was still relearning how to speak, but the hungry little moan she made said everything.
Rengoku groaned deeply as she wrapped both soft hands around his shaft, stroking slowly from base to tip.
"Nezuko... ahh, your hands feel amazing!"
She leaned in and dragged her warm tongue along the underside, tracing every vein while looking up at him with those innocent-yet-filthy eyes.
Then she parted her lips and took him into her mouth, first just the head, sucking gently with wet, slurping sounds.
"Mmmph... mmmh!"
The vibrations from her moans made Rengoku's hips buck.
"Fuck— yes, just like that! Suck my cock, Nezuko... you're doing so well, taking me so eagerly!" He threaded his fingers gently through her long hair, not forcing her but guiding her rhythm.
Nezuko bobbed her head deeper, hollowing her cheeks as she worked half his 7inch length into her hot, wet mouth.
Saliva dripped down her chin, coating his balls as she hummed happily around him.
"Nngh! Mmmph... glk... mmmh!"
Rengoku's head fell back with a loud, passionate groan.
"Your mouth is like fire! So warm, so tight... ahhhn, swirl your tongue right there. Yes! Good girl!"
Glk!
Glk!!
She worshipped him thoroughly; licking and sucking his balls one by one while pumping his shaft with both hands, then taking him deep again until the head bumped the back of her throat.
Nezuko gagged softly but kept going, eyes watering with pleasure as she moaned nonstop around his cock.
"Mmmph! Glk-glk... ahhhn!"
After several long, sloppy minutes of her enthusiastic blowjob, Rengoku gently pulled her off with a wet pop.
Strings of saliva connected her swollen lips to his glistening cock.
"Enough, Nezuko... I want to taste you too before I lose control!"
He lifted her effortlessly onto a flat rock, spreading her thick thighs wide. Her torn kimono fell open completely, revealing her slick, swollen pussy already dripping with arousal. The pink vine tattoos framed her most intimate places beautifully.
Rengoku dove in like a man starved, his tongue lapping broad stripes from her entrance up to her clit.
"Ahhhn!" Nezuko cried out, her back arching sharply.
Her hands fisted in his hair as he ate her out with fiery passion; sucking her clit hard, then fucking her with his tongue while two thick fingers pumped inside her tight walls.
"Mmmh! Hahh... nngh... Kyojurooo!"
"You taste incredible," he growled between licks, voice muffled against her soaked folds. "So sweet and wet for me... cum on my tongue, Nezuko! Let me feel you shake!" His dirty words sent her spiraling.
"Aghnnn! Ohhhmmm! Ohhmmm!!!"
She moaned louder, hips grinding against his face as he added a third finger, curling them perfectly against her sensitive spot.
"Nnngh! Ahhhn! Hahh... mmmph.. I'm... ahhh!"
Nezuko's first orgasm hit hard. Her thighs clamped around his head as she squirted messily against his mouth. Her body trembled while she let out broken moans.
Rengoku didn't stop until she was panting and oversensitive. He rose up, cock throbbing and slick from her earlier efforts, and positioned himself between her legs.
"Are you ready? I won't hold back my flames for you!"
Nezuko nodded frantically, pulling him closer with a needy whine.
"Mmmh... please... inside..."
He pushed in slowly at first, groaning loudly as her tight, fluttering pussy stretched around his thick girth.
"Ohh fuck.. so tight! You feel perfect... take every inch like a good girl."
Inch by inch he sank deeper until he bottomed out, his heavy balls pressed against her ass.
Nezuko's moan was loud and shameless.
"Ahhhhhhn! So big... hahh... fills me up... mmmh!"
Her walls clenched rhythmically around him, demonic strength making the squeeze even more intense.
Rengoku started thrusting; deep, powerful strokes that rocked her whole body. Skin slapped wetly against skin as he picked up speed, pounding into her with all his Hashira strength.
"Yes! take my cock, Nezuko! Feel how hard you make me... ahhn, your pussy is gripping me so greedily!"
He leaned down to capture one of her bouncing breasts in his mouth, sucking hard on the nipple while his hips snapped forward relentlessly. Nezuko wrapped her legs around his waist, heels digging into his back as she met every thrust.
"Hahh! Kyojuro... harder! Nngh... ahhhn! Feels so good... mmmph.. Yes!"
The cave echoed with their sounds. Her constant high-pitched moans mixed with his deep, enthusiastic groans and filthy encouragement.
"You're so wet... listen to that sloppy sound! My cock is ruining this pretty demon pussy... cum for me again!"
He flipped her onto all fours, gripping her wide hips and slamming back in from behind. The new angle hit even deeper, making Nezuko scream in pleasure.
"Ahhhhh! There... right there! Hahhn... don't stop... mmmh... I'm cumming again!"
Her second orgasm crashed over her, walls milking his cock as she pushed back against him desperately. Rengoku kept fucking her through it, one hand reaching around to rub her swollen clit while the other tangled in her hair.
After what seemed like hours, his own climax built like an inferno. His thrusts turned erratic and brutal.
"Nezuko... I'm going to fill you up... take every drop! Cum with me!"
With a loud, roaring groan he buried himself to the hilt and exploded inside her. Thick, scorching ropes of cum flooded her pussy, so much it overflowed and dripped down her thighs. The sensation pushed Nezuko into a mind shattering orgasm.
"Ahhhn! Kyojurooo... mmmph... hahhhhh!" Nezuko moaned as her body convulsed and her pussy milked him dry.
They collapsed together. Rengoku pulled her into his strong arms, both of them panting and glowing with sweat.
He pressed soft kisses to her forehead and horn, murmuring warmly, "You were magnificent... my fiery little demon."
Nezuko curled against his chest with a contented, sated hum, a soft smile on her lips.
"This will be our little secret," Rengoku whispered into her ear. "Tanjiro must never know."