(This was requested by enjoy!)

~3rd pov~

Y/n L/n, a Demon Slayer member in the Demon Slayer Corps and the master of the Rose Breathing technique. The strongest Demon Slayer right behind Yoriichi Tsugikuni, her grand father being a descendant of the Tsugikuni bloodline and marrying a woman of the Ice Mountains known as the Fuyu-no-hana Clan.

Her clan was wiped out by demons sent by no other than Muzan Kibutsuji himself. By eliminating her clan, Muzan had thought to have gotten rid of the threat, but not know that one remained alive and well and more powerful than ever.

Her mother had hidden her away from the demons, covering the young baby in blood to hide her scent from the monsters attacking them. Soon being found by a Demon Slayer and being brought back to the DSC. (Demon Slayer Corps)

She planned to get rid of all demons on earth and avenge her innocent clan. Now here she was, walking alone in the woods, hunting for demons.

~Y/n pov~

I held my sword as I walked on, the sun was slowly falling. My hand growing tight around the hilt of my blade, I smelled the air and smelt blood. My legs ran, following the scent like a wolf hunting down it's prey.

I was getting closer, the scent was stronger. I could hear the flesh being ripped apart. I found the broken down home and carefully entered, quiet and silent.

My steps light and graceful as I slowly opened a door. 2 mangled bodies were there, I moved on to the next room and just saw blood.

"The prodigal daughter returns~" A voice echoed from behind me.

I snapped around and saw the red glowing eyes of the demon.

"Muzan."

"Y/n. You've grown. . . Quite stunning may I say."

"Don't try and think your way out of this. . . You will die by my blade." I threatened.

"Please. . . A flower breathing Demon Slayer? You can't possibly win."

"You've seem to have forgotten where I came from."

". . . That mark on your cheek. . . A red rose."

He was trying to distract me. I prepared my position and stared at him as I began to say.

"Fourth Form: Falling Petal That Never Reaches The Ground."

{The Demon Slayer will swing their blade, allowing it to slowly arc as they move with the breeze beheading the target in one clean silent slice.}

Muzan's eyes widened as he barely dodged my attack. My blade nearly slicing into the skin of his neck, he broke through the wall and was back outside.

He touched his neck and looked at his blood.

"Quite the speedster." He snarled before running faster than light straight at me. I needed a defense.

"First Form: Blossoming Lumine!"

{The Demon Slayer remains in place, unleashing numerous slashed around themselves to block incoming attacks and defend themselves.}

Muzan had his hand sliced into, and he backed up. My blade destroyed the walls of the house as I backed up, Muzan fled to the trees above me.

I kept my guard up and listened closely, smelling the air, tracking the blood wherever he was. He jumped from the branches and I was already prepared for it.

"Fifth Form: Swirling Focus!!"

{The Demon Slayer kneels down to the ground before springing upwards, moving in a spiral motion upwards to unleash a deadly and deep cutting slash.}

The slash sliced off his entire lower half, his yell and grunts as he fell to the floor and rolled, his blood spurting out of his detached legs. I wasn't done, my legs hit the side of the tree before I leapt off and down to him.

"Eighth Form: Thorns Descent!!"

{The Demon Slayer leaps in their air above their opponent, quickly positioning themselves above their opponent before unleashing a descending slash to strike. Alternatively, this form can also be used to gain directional control if the Demon Slayer finds themselves in free fall.}

My blade sliced right through his neck. Decapitating his head from his torso. I thought it was over. . . Until his body grew quicker than I could blink.

"Agh, this is child's play." He sighed before he shot in front of me and grabbed my throat.

Slamming me into the tree. I gagged and held his arm, clawing and grabbing my sword when he tossed it away.

"You would make a strong demon."

"No- I-I'll kill you- before you get the ch-argh!''

"Y/n. . . . Y/n, who's going to stop me?" He whispered in my ear.

I kicked his stomach and elbowed his jaw which did nothing to him, he rolled his eyes and lifted me before throwing me to the floor. The wind being slammed out of my lungs, I gasped and tried to crawl to my sword. Get my breath back, my fingers reaching the blade until it was kicked away and I was flipped over on my back.

His red eyes staring into my soul as he held my throat. His clawed nail cut open my rose marking on my cheek before he bit his hand and slowly lowered his blood to my open flesh.

"No! Get off!! Don't change me!! Let me go!!!" I screamed as I tried to kick him off. But I felt his warm blood drip into my blood.

I yelled as he wiped more in. I soon passed out from lack of oxygen since he was holding onto my throat too tightly.

~~~

I woke up in a soft bed and warm silk robe. I groaned and moved my hands, but soon realizing that they were tied up to the bed post. I coughed and felt itchy all over my body, it was hot and unbearable. I snarled and whined at the burning heat in my body.

"Looks like the transformation is working." Muzan said.

"AGH!!" I screamed.

"Loud and vocal. . ." He sighed.

"WHAT DID YOU DO TO ME?!" I shouted.

"It's transforming you into a demon. . . Not like the others I've made though. . . I'm making you into my bride. And for the transformation to end quickly, I'll. . . Need to mate with you." He said as he unzipped his pants.

"AGHHH!!!"

"Unless you want to reject me and let this process torture you for a while."

"HOW LONG IS THE WAIT?!"

"5 years."

"GAAAHHHH!!!" I yelled in agony.

But I didn't care, I'd rather burn in this torture then to let him have my body. It was tingling my body, I felt my core growing wetter by the second.

I felt his hand touch my leg and slowly trace up my thigh.

"No!!!" I snapped.

"Let me show you how easily I can make the pain go away." His hand grazed over my wet heat, I shivered from the cold of his finger before he pressed his fingers inside of me.

I moaned immediately feeling relieved from the aching pain. Until he pulled out his hand and the pain came flooding back.

"AHHH!! FUCK!!" I shouted.

"I can help you.'' he purred as his licked my fluids off of his finger in front of me.

I panted harshly with sweat and gasps, he killed my family, I can't- but it hurts, it hurts so much.

"AHH!"

"Make your choice, Y/n."

I growled and spread my legs.

"Do it! Just do it now!! Fuck me and get rid of it now!!"

"Such an impatient little slut~ I'll help you." He smirked, he moved faster than ever and soon I felt something penetrate my pussy.

A loud gasp fell from me as his cock tore through my body, the pain almost faded away immediately. His strong body grinded against mine, his teeth bit my shoulder as I shut my eyes. Letting myself enjoy the moment of relief.

"Ah~~"

"You better now?" He chuckled in my ear as he rolled his hips.

"Y-You're still a c-coward- AGH!~" I yelped when he bit my breast.

Drawing blood from it as he held my legs open and shoved himself all the way inside of me. He made his cock grow larger inside of me on purpose, I screamed feeling the pain mix with pleasure in me.

"Muzan~ Agh!~ Faster! Fuck me faster now!~" I cried, never in my life did I ever think about having a demon fuck me.

He snapped his hips inside of me, his grip on my legs was painful, his dick almost pressing against my uterus. My toes curled and my breath shortening.

My orgasm shudder through my body, his cock invading me as he kept grinding his hips. Our flesh smacking against each other, I snarled and bit his shoulder without him realizing it.

He kept this up for hours, I'm pretty sure I was losing feeling down there. He was drooling on my breasts, my wetness spread on his groin, he bit my lip and stuck his tongue inside of my mouth. Cutting my moans out with his lips, he broke the ropes and turned me on my side, hugging my leg and fucking me like a dog.

He pulled my hair back and kept moving. His dick was inhumanly huge, I saw how I pushed against my skin when I looked at my stomach.

"Muzan! Muzan!~ stop!~ I'm done~"

"I'm not!" He growled.

He was destroying my body, he bit down my on chest and left marks everywhere on me. Finally he pulled out and painted my entire chest with his cum.

I coughed and fell limp, my core was sore and shaking. Muzan sat on his knees and took deep breaths.

"Now. . . You'll be my bride." He said.

". . . Muzan. . . I'd rather die than be your bride."

He chuckled and thrusted his fingers inside of me again.

"Gah!~"

"You will be my bride. You will do what I say and whatever I say no matter what. You are my Demon only. . . What are you muttering about?"

He didn't hear my whispers, but he'll regret it.

": Rose Spring!!!"

{This form is used to disorient their opponent by cloaking themselves with a storm of petals and also by manipulating their own movement.}

He yelled as flower petals surrounded me and blinding Muzan.

When he looked to see me, I was gone.

_________________________

Hope you enjoy it!!

Stay tuned and seeya soon guys gals and non binary pals 💜💙💖