The pair leapt from building to building, trying to pinpoint the demon's location. ''It's close.'' Y/n mumbles. ''Its aura is getting stronger..'' she explained. The two ran down a street and turned into a corner. There wasn't a demon. Instead, there were roots, clinging onto the walls of the alleyway. ''Help me!'' a desperate cry rang from the air. The pair looked up to see a boy slowly being wrapped up by the roots.
''Help! I..I can't move!'' The boy pleaded. Without another word, Muichirou sprang up and sliced the roots apart, allowing to boy to be set free. However, he didn't think this through, The boy started to fall 10 feet from the air. Lucky, y/n jumped in and caught him.
''Are you alright?!'' Ys/n asked. The boy slowly opened his eyes to meet hers. ''I must be dead already, being carried by an angel.'' He stutters. Out of disgust, y/n immediately drops the boy and crosses her arms. On cue, Muichirou stepped in, ''You're getting in the way, go hide somewhere.'' he spoke in an uninterested tone, not even sparing a glance at the boy.
The boy nodded and quickly fled from the scene. Y/n examines the roots as it starts to regenerate, connecting its broken parts together in a matter of seconds. '' Demon blood art...'' Muichirou spoke as if he read her mind. Y/n nodded as she continues to observe the roots movements tracing it back into the building.
''There.'' Y/n indicated, pointing at the demon's location. ''It's hiding in a building. What a prick, let's go.'' Muichirou said, drawing his blade as he climbed the building and into the window, not wasting any second. The aura around Y/n was turning into a huge mess, she knows that this fight is going to be ugly.
Without wasting another moment, she followed behind Muichirou and entered the window. The room was a mess, tables flipped over, books and papers scattered, bookshelf leaning on one another. ''Was this a library?'' Y/n thought to herself as she picks a book up. She wonders how many books there were here, destroyed.
The aura in the room was still a huge mess, she knew the demon's close, watching their every move. ''Keep your alert high Muichirou..'' She warned. The boy nodded as he walked further into the room. The room was horribly dark and the only light was the silver moonlight shining in through the windows.
A chill ran down Y/n's spine as she heard the sound of a blade slicing flesh. Y/n immediately turned her attention to the sound, desperately looking for the mint eyed boy. ''Tokitou!'' She shouted, hoping for a reply. No response. She frowned, hoping nothing bad has happened o him yet.
''Aww you're worried for me.'' A cold voice whispered into Y/n small ear from behind. Startled, Y/n spun around and thrust her fist towards whoever was there. ''Wo woa it's just me.'' Familiar mint eyes stared back at her violet ones as his palm holds onto hers. It's only been two years and the boy has already grown taller and stronger. (or maybe y/n is just short)
''....I know it's you. I was just making sure.'' Y/n defended. ''Uh-huh.''Muichirou answered wearing an unimpressed expression as he lets her hand go. Y/n felt the aura growing heavier and heavier, feeling it as it sped towards the pair. ''Muichirou, your left!'' She shouted.
Obeying, the boy turned to slice an incoming root just in time, preventing it from hitting him. The pair stood back to back, waiting for yet another attack. Y/n drew her katana, her grey blade shining with the moonlight. Within seconds, multiple roots attacked from many different directions. The pair split up and attacked their own roots.
Using her breaths and forms, Y/n skillfully sliced up the roots, leaving them to drop lifelessly onto the wooden floor. However, the more she sliced, the more roots attacks her. ''This is no use...They'll just regenerate.'' y/n thought she the roots she had just cut up, growing back together. As her focus was on the newly formed roots, she didn't notice one coming for her leg from behind. It wrapped itself around her thin ankle and pulled her forcefully, making her facepalm onto the wooden floor.
''Oof!''
The root retracted, bring her along, closer to wherever these roots at coming from. Focusing her breath, Y/n used her forms to cut up the root holding onto her. Now free, she stood up and scanned her surroundings. Muichirou was nowhere to be seen and the sound of his blade slashing was getting faint. The aura around her was heavier than before. ''The demon is definitely closer now.'' She thought.
Holding her blade in front of her, she waited for an attack. From behind, a root shot towards her. Y/n spun around to land a blow on it, but it dodged, it fricking dodged. ''Fuck.'' she thought as the roots sliced across her waist. ''Ah..'' she groaned, placing a hand over her wound as her thick and warmblood flows out of it.
''Damnit. These roots are sharper and smart than those before.'' She concludes as she wraps her kimono around her waist, trying to stop the bleeding. Fortunately, it wasn't as too deep. Y/n focused her sense of the demons aura, trying to predict its next move.
Meanwhile, at the other side of the library, Muichirou leapt from bookshelf to bookshelf, dodging every attack. There was no use in slicing these roots, he would have to go straight for the demon. His mint eyes scanned the room for not only the demon but for y/n as well. He prayed that she isn't harmed in any way. He needs to protect her.
While distracted in his thoughts, a root reached for him, wrapping him in an instant, only leaving his head exposed. ''Ho Ho Ho, they've brought me another delicious meal haven't they?'' A sharp voice rang from a distant, giggling. The mint eyes boy, however, still wore a calm expression, not fighting the roots.
Muichirou tried moving his arm, trying to get his blade to cut the roots, but his struggle only makes the roots tighten around him, crushing his bones. Slowly, a figure emerges from the shadows, ''Looks like I'm eating good tonight.'' the demon smirked, holding out a person's dead torso, showing it to the boy before taking a bite from it, chewing delightedly.
A mischievous grin spread from its lips as he licked it clean of blood. Its eyes fixed on Muichirou as if he was a helpless prey. The demon drooled, ready to taste the boy, sinking its teeth into his flesh and spilling its blood.
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(A/n)
Heyyy Its the author here. Erm, I dunno if anyone actually read this or if there's actually anyone reading this at all. Hahahaha, I am not surprised if there's no one reading so since I made this book cuz I was bored.
But if you're reading this, Thank you :) Thank you so much and I hope you enjoy it so far.
- WritingBlanks

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Lifetimes
FanfictionA Demon Slayer fanfiction (kimestu no yaiba) Muichirou X Reader - Does love really descent through lifetimes? Is it really that powerful? ! Spoiler alert! [This story follows the manga] This story contains some mature content! - The drawing of th...