The sun was shining, the birds were chirping, and a slight breeze kept the leaves moving.
It was a perfect day.
And what was our protagonist, (Y/N), doing on this mighty fine day, at noon? Still sleeping of course.
A loud yelling and the front door of the Butterfly Mansion slamming shut made the boy jump onto his ass, now wide awake.
'The heck was that?! Wait.. Oh no!!' Jumping up from his bed, the (H/C) haired boy swiftly changed into his demon slayer uniform.
He just remembered that he should have arrived to Rengoku's place at 11 am and since its noon, he's an hour late, something that the flame hashira did not like at all. So he came to get the boy himself.
(Y/N) straightened out his haori and finished himself up, getting ready to head out. But there was one thing he forgor, and that was the sakura mochi on the nightstand. Since yesterday, there were only 3 left of the 6, so he just took the whole bag as lunch. Which isn't much.
Bursting through the door, the half demon boy came face to face with Rengoku and Shinobu, looking nervously at the two, sweat flowing down his face.
"You're here at last! Come now, duty is waiting for us!" The flame hashira exclaimed while turning around and making his haori swirl around for a cool effect, "I'll be seeing you around, Shinobu!" And the man left through the door.
"Bye Rengoku-san!" The insect hashira said her goodbyes and turned to (Y/N), "Since you all are recovered, you lot will go on your next mission tonight. You'll meet the others on the Mugen Train, Rengoku-san is going to give you more details on the task. Come back in one piece!"
"A-Alright, I understand.. see you soon, Shinobu-san." (Y/N) waved at the smiling hashira before quickly rushing outside to catch up with Rengoku.
"Rengoku-san! I'm so so SO sorry for not being there on time!" The half demon boy finally caught up to the hashira who was a good distance away from the front doors.
"Don't worry kid, I forgive you, but as punishment, the training you are going to go under is going to be more tiring and rigorous!" Rengoku took a stance, and spoke once more, "For the first part, try and keep up with me."
The flame hashira took off, leaving a cloud of dust behind.
"I'm getting a really strong sense of déjà vu here.. don't know why." (Y/N) mumbled to himself before taking a really deep breath and using Shadow Breathing constantly.
"Shadow Breathing, Second Form: Dash of the Evening."
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
"About time you finally got here!" Rengoku yelled out, patting (Y/N) on the back.
The poor boy was panting like a dog, having to run a really long distance while he also used Shadow Breathing.
After a few seconds, the (H/C) haired boy caught his breath, finally able to stand straight. As part of rest, he took out the pink and green bag and swiftly got out a sakura mochi before putting it away again.
"I can say that you kinda passed the first test, you kept up with me most of the way!" The flame hashira gave some praise to the boy but before he could say anything back, someone yelling and running from around Rengoku's house caught his attention.
It was Mitsuri.
"There you two are! I was worried!" The love hashira appeared with tears in her eyes.
"I just went and personally retrieved our hostage! There's nothing to worry about!" (Y/N) tensed up after hearing what the flame hashira said, already feeling the torture he's going to go through.
"It's alright, cuz without (Y/N) here, there wouldn't be anyone to train! Ooh, are you still eating my sakura mochi?!" Mitsuri's eyes sparkled, "Are they that good?!"
"Ah-! O-Oh, yeah, they're really good!" (Y/N) answered.
"I'll make some for you the next time we meet!" The love hashira set up another goal for herself.
"Alright, enough chit-chat, let's get to training!"
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
Cue training montage!
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
We see (Y/N) doing squats with weights positioned around his shoulders all the while Rengoku and Kanroji are cheering him on.
Next is (Y/N) slicing different sized fruits and vegetables that are thrown at him by Kanroji to increase his accuracy.
And last but not least, Rengoku is seen hitting (Y/N) multiple times in different areas at great strength to make him get used to pain and increase his durability in his human form.
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
After a few hours of those things, it all came down to the breathing styles.
"Alright (Y/N), watch as close as you can!" Rengoku breathed in deep, "Flame Breathing, First Form: Unknowing Fire!"
(It's all in this order, except the Ninth Form.)
Rengoku dashed forward at tremendous speeds and slashed horizontally once, flames following his blade.
Turning around, the flame hashira got ready for the next form.
"Flame Breathing, Second Form: Rising Scorching Sun!"
Rengoku slashed the air from the ground upwards in a circular motion, kind of like Water Breathing's Water Wheel, but this was vertical.
"Flame Breathing, Third Form: Blazing Universe!"
Rengoku did the same thing as before, but this time he slashed downwards.
"Flame Breathing, Fourth Form: Blooming Flame Undulation!"
The flame hashira now swung his sword in an almost complete circle, creating a wall of flames in front of him.
"Woah.. Flame Breathing really is as cool as I thought!" (Y/N) exclaimed.
"Yeah, I'm proud it was my first breathing!" Kanroji agreed.
"Flame Breathing, Fifth Form: Flame Tiger!"
Rengoku raised his katana high, and dashed forward while starting a series of slashes in front of him, taking the form of a giant flame tiger.
"Oh, wow..!" (Y/N) stood in awe from this magnificent performance put on by the flame hashira.
Rengoku sheathed his katana like a pro, looking at (Y/N), "Now it's your turn, show me what you got."
The boy grabbed his wooden sword and took his temporary teacher's place, and breathing in.
"Mimicry; Flame Breathing, First Form: Unknowing Fire!"
(Y/N) dashed forward like Rengoku did, but when he tried slashing, he realized there was no blade, only the handle. Ashes scattered around the place as his wooden sword just burnt to crisp.
"Now that's something I haven't seen yet! Here, take my sword and complete my training!" Rengoku handed over his, and (Y/N) got ready once again.
This time, he was successful. He did all the forms perfectly, though heat quickly filled the area, and the sword got pretty hot as well.
"Hehe.. you might not want to touch this katana for a bit, Rengoku-san.." The three laughed, deciding on spending the rest of the day together before going off on missions.
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
And our (Y/N) now finally also knows Flame Breathing!
Lemme know what you think of this fanfic so far, if you'd like to of course!
Words: 1091
YOU ARE READING
In His Shadow (KNY x M!Reader)
FanfictionBeing the best friend of Tanjiro Kamado, (Y/N) always wanted to help him sell the charcoal he brought with him from the mountain. But one day they had to work twice as hard as usual. This resulted in (Y/N) offering to carry Tanjiro's basket up with...
