𝐭𝐡𝐞 𝐥𝐚𝐝𝐲 𝐨𝐟 𝐭𝐡𝐞 𝐛𝐥𝐮𝐞 𝐬𝐩𝐢𝐝𝐞𝐫 𝐥𝐢𝐥𝐲 (soft yandere x y/n)

7~ calm before the storm

sorry for the short-ish chapter! exam season kicking my ass rn

narrator pov

one day, towards the end of june, ubuyashiki ordered for kyojuro, tanjiro, zenitsu and inosuke to check out the mysterious mugen train. y/n first heard of this when she eavesdropped on kanao whispering about it with aoi at the estate. "rengoku is immensely strong kanao.. ive seen him, no train demon is getting past him" aoi stated triumphantly. "i guess you're right aoi, its silly of me to doubt him." kanao sighed.

'train demon? does she mean the mugen train?'

y/n was not happy when she heard this news. in fact she was mortified, a strange feeling of dread blossoming within her. y/n knew all too well about the mugen train as it was notorious for all the demon attacks. if its come to that they have to send a hashira then its no longer to be taken so lightly.

y/n took a deep breath and ran out of the estate, heart pounding, impending doom clouding her senses. her only goal was to find oyakata-sama ,and tell him that she volunteers in place of rengoku.

she wasnt thinking straight and soon enough she ran straight into someone. "ah! im so sorry" y/n shouted as she landed on her bum. she huffed, as the person in front of her offered their hand for her to take. when she looked up, that hand belonged to no one but the flame hashira himself. "haha thats alright lovely! just be more careful next time!" rengoku exclaimed shining his signature bright smile.

y/n choked on her breath. 'i need to tell him, tell him right now!'
she got up in an instant pointing her fingers at him. "kyojuro rengoku i forbid you from going on that mission! its too dangerous and i wont allow it!" y/n commanded, puffing her cheeks to look more authoritative. however, the red head didnt seem fazed, in actual fact he flushed over how adorable he thought y/n was trying to act all supreme.

rengoku only just chuckled at her. "darling you know i cant just pick and choose my missions, but i think its cute that you worry about me." he uttered, lowering his voice at the last part. still with his big goofy grin he reached out his hand to caress y/n's cheeks, but she slapped it away. rengoku was taken aback by this.

"kyojuro theres no time to make a joke about this!" y/n shouted in a serious tone, her voice almost cracking. "listen to me, i have a very, very bad feeling about this mission. let me go in place of you, i promise im strong enough. you know that im strong enough."she pleaded with tears brimming in her eyes. "y/n, i was assigned this quest by oyakata-sama and its my job as a hashira to fulfil my duty." rengoku spoke sternly.

they both just stared blankly at each other, kyojuros eyes holding determination whilist y/n's were in despair. identifying this the flame pillar wasted no time in wrapping her up in a bear hug. y/n let silent tears slip out. "promise me kyojuro.." y/n said softly, her voice muffled by her face being squished into rengokus uniform. "what was that sweetheart?" he voiced as he moved back slightly for y/n to speak clearly.

"promise me youll come back kyojuro. promise me you wont die!" she cried, her breathing fragmented. rengoku only stayed silent. "kyojuro?" y/n asked looking up, only to be met with a stoic expression. "kyojuro! promise me youll live!" she shouted clenching his uniform. the red head remained soundless. he raised his arm up and petted her head slowly, comfortingly. a few moments passed before rengoku finally spoke up.

"i would like to be able to say ill come back, but i refuse to make promises i know cant be guaranteed. as the flame pillar i will protect everyone. thats my job." saying this rengoku only held her closer. he wanted to spare this moment with her, because who knows, this may be the final time hes able to share with the one he loves. y/n' breath caught in her throat. 'why does he sound like he's saying goodbye?'

"let me go with you!" y/n blurted out. this shocked the hashira a bit. "i can help! i promise! oyakata-sama has already approved me of being a demon slayer, im easily as strong as a pillar!" she pleaded her hands flailing in desperation.

"i wont let you." said rengoku.
the way he said this was so odd. it wasn't the silly adorable goofball everyone knew him to be. this wasnt rengoku. y/n was dismayed, and slightly frightened. rengoku looked at her with upmost seriousness, like he was a bird and she was his prey.

"kyojuro i-"
he cut her off.
"y/n im sorry but you need to understand that its my mission, that im going to complete."

"so what am i just supposed to sit here thinking you and the three boys are dead the entire time?" y/n shook with an indescribable emotion, was it fear? rage? frustration?

"i plan on surviving y/n. thats all i can do." rengoku concluded, bowing his head for forgiveness. "yeah? well so did your mother, kyojuro. and my sister." the blue haired girl stated with an unwavering tone. it was a harsh thing to say, but it had to be made known.

rengokus eyes widened at this. 'she cares. she doesn't know it, but she cares too much. its vital for a demon slayer to not cling on to people so much, for their sanity. her own compassion will be her downfall.'

"i love you, y/n." and with that rengoku leant down, planted a kiss on her forehead, and took off to prepare for the mission.

"he loves me?"