You Become A Tsuguko

You were holding Zenitsu, Tanjiro, and Inosuke. Inosuke and Tanjiro on your shoulders and dragging Zenitsu... well until Nezuko 'Mmm'ed at you to carry him properly, to which you then were basically forced too. When you got to the estate, the agents took them inside and went in. Miki came rushing out to you, and luckily it was night time when you all arrived. "Y/n! Are you okay?! I heard what happened!"


"I'm fine, I'm fine." You numbered and took off the top of your robe. Nezuko blushed and looked away. You pointed to the scar on your chest. "Still got this scar, but it's the only one."


"From what I heard, you're supposed to be a torso and a head." Miki crossed her arms and you scratched your head.


"Yeah, Grandpa saved me..." You then half squinted your eyes with a bit of annoyance. "He did put his hand in my heart but that's besides the point."


"You must have scared Nezuko." Miki said as you looked at Nezuko, who was still holding your hand. She clenched on to it and nodded. She didn't know if you knew this, but you weren't seen as Nezuko's family. You remained that same in her mind. Not that she could tell you that, but if you knew(which you did), you'd probably blush and not say anything anyway, which you did. Miki slapped you on the back. "That's something you gotta work on!"


"I've been meaning to ask you, aren't you part demon too?" the question was asked and she scratched her face.


"Well, yeah but... I didn't go through your training so, I doubt I'd be any help in the field. I mean, I experimented a bit with mom's now but nothing much." Miki stated as you crossed... actually no, you didn't. Nezuko finally let go of your arm but you looked at her in confusion. She shrank so much that you didn't even hesitate to put her on your shoulders. You then gained a serious face as Nezuko ran her fingers through your hair.


"Sis, where is Shinobu?" You asked her as she was trying to take you seriously... as much as she could.


"Uh...In the medical bay..."


You then walked to the medical bay and saw Shinobu leaving. "SHINOBU!!"


"Hmm? Oh, Y/n." Shinobu said her usual smile and looked you up and down. "I'm glad your in a stable condition."


"How are they looking?" You asked and she sighed.


"Inosuke's poison... there's nothing I can do but try and extract it. But he shifted his organs around so that makes it even more complicated." Shinobu explained as she closed the door to the beds. "Tanjiro is in a coma, but stable. Zenitsu is already healed, but sleeping."


"Good... that's good. I have a favor to ask..." you got down on your knees and Shinobu was shocked. You put your head to the ground. "I know this is a lot to ask of me. But can you take me under your wing?"


"To say I'm shocked is to say the least. I most certainly wasn't expecting your favor to be so dire that you had to get on your knees." Shinobu teased but held genuine confusion. "What makes you want to be under me?"


Your mind went back to the fight. "After the fight with Daki and her brother, I learned that I'm so dependent on my form, and I've gotten sloppy with my skills. Urokodaki would've slapped the shit out of me if I blew it. But, I also learned how dangerous posion was."


Images of Inosuke being stabbed, Uzui's small cut, your body being sliced off. "I need to kill my enemies slowly without them realizing it, but the only way I could learn that skill set is through Insect Breathing, right? This is the only way I can feel certain that I can kill a demon for good."


"Although your courage is well spent, I have to advise against it." She gained a more serious tone but kept her smile. "Insect Breathing is a Breathing Style for me specifically because I can't cut through a demon's neck because of my lack of physical strength... but you can."


She faced towards you and looked down at you. "You could go through all this training, become my Tsuguko along with Kanao, learn all this, and at the end, it may not even succeed. Will you keep going knowing this?"


At first you were silent. She was right, you had the physical strength and power to push through demon heads. The whole reason you couldn't learn Water Breathing was because your lack of a calm mind. And could you really pull back your strength and go away from the main points of Demon Breathing?


You didn't know for sure, but either way. "Heh, you say that like you doubted me."


You smiled and looked up at her as Nezuko was watching from around the corner. "I accept."


Shinobu smiled even more and put her hands together. "My, what a unusual outcome. But I can't say I excepted any  less from you, Y/n. Training begins early in the morning, should be enough time, yes?"


"Um... Shinobu...!" You shouted and she turned back to look at you, after she started to walk away. "I'm sorry... for... you know... when we first met..."


"Oh, you mean the name calling and the trying to kill each other part?"


"When you say it with a smile but your raging on the inside, I can't tell whether to agree or deny it..." You weighed your options as she shook it off.


"It's in the past now." She said but you handed her the ore. "...?"


"Oh, that's the ore I got from the Final Selection. Since I had the Tessaiga, I never needed to use it." You said and Shinobu got the message.


"I understand, although... I won't send it to him just yet. We need to see how your technique is first." She said and walked away. You looked at you fist and clenched it standing up.


Your ears then twitched as you looked at Nezuko. "Oh yeah, I need to make sure the box is fixed."


You led Nezuko to your room in the estate... more like the shared room you all had.... Okay you led her to a room. "Wait here for a min."


She didn't listen and hopped on your shoulders again. You put her down again and she seemed rather annoyed you were trying to get rid of her and grew. She leaped on you put you held her up by her robe and placed her down. "I'm only gonna be gone for a second."


She crossed her arms as you sigh and picked her up. You put her in your shoulder and she beamed up. Patting your hair as you tried not to blush or sigh again. You picked up the box and went out into the forest. You took out the Tessaiga and sliced the bamboo with ease. You actually looked at your strength with confusion. "Even though I know I'm stronger than bamboo... it's weird. It feels like I've gotten years of experience after facing the upper moon. But being close to death was not..."


You tried not to say anymore because Nezuko held your face with worry even more. "Sorry I scared you, Nezuko. But you scared me too! When you went full Demon, you gave me a hell of a show."


She held on to you more with sad eyes. You just smiled at her as Nezuko saw a flash of your black haired self. "It's fine, maybe you'll learn to control the form like me."


You finished cutting the bamboo and taking supplies and effectively put the box back together. You gained a smug smile. "HAHAHAHA, praise me, Mongrels!"


Nezuko clapped slowly in amazement but it was more of a pity clap. You soon went to lay down but you gained the courage to lay down on Nezuko's lap. "?...!"


"Hehehe." You smiled as Nezuko cupped your face and slid your hair. There was something about Nezuko's touch that just made you sleepy. You soon fell asleep Nezuko put her lips with her new gag to your forehead, to sneak a kiss goodnight. When early morning rolled around, you were on a pillow and Nezuko was in the box. You suddenly shot up with a scared look. "A LAP PILLOW IS MORE LIKE A THIGH PILLOW!"


You then looked at the time and looked around. "I guess my body woke me up at the right time..."


You leaped up and brushed off the specks of dust off you. You then picked up the Tessaiga and went to leave but then you heard scratching. Your face naturally darted to Nezuko's box. You went to leave again and the scratches got louder. You smirked and got ready to leave again before you decided to stop teasing her and picked her and the box up. "Alright, that's enough teasing for today. We really have to make a scratching code for you so you can talk."


You walked out of the hall to go outside, but there was no one out there. You tried to smell for Shinobu's scent and made your way back to the medical bay. There you saw bowls, flowers, and some herbs along with Shinobu. "Oh, Y/n. You finally arrived."


"Uh... what's all this?" You asked and Shinobu sighed.


"You can't piece it together already? You need to learn how to use the poison with your swordsmanship." She explained and she gestured for you to come closer. She then picked up the scabbard of her sword. "However, unlike majority belief, I do not coat my blade in poison. When I create the poison, I keep it in the scabbard of my sword, which I have modified to inject the poison upon contact. As a result, Insect Breathing generally involves more thrust attacks to ensure proper poison delivery. Even a tiny cut can kill the lesser demons but higher rank demons can easily resist it."


Shinobu then put down the scabbard and picked up the wisteria flower. "As you know, the demons hate these flowers and usually stay away from it..."


She then waves it in your face but nothing happens. "Tell me, Y/n. How do you feel?"


You looked around yourself. "I'm not really feeling anything, maybe a little itchy."


She giggled a little before taking the wisteria away and put it into a bowl and picked up a wooden block. "Still so much more to explore about Toga's side of the demons. Moving on..."


She then started slamming the small wooden block into the bowl and destroying the flower. She was moved by very, very fast. Almost as if she was taking her anger out. "Now, watch very carefully. To make the poison, I grind and slam the flower so much that it turns into liquid and then I grab some herbs from the forest to make the poison."


She lifted the block and you looked in the bowl to see purple liquid. You then saw Shinobu points to a few pictures in a book. "What's that?"


"These are the herbs you'll need to grab from the forest." Shinobu said and clapped her hands. "Get to it, young one!"


You gritted your teeth and took the book. You then ran out the door. "YOU'RE ONLY 18 OR SOMETHING!"


You leapt outside as the sisters looked at you. "Oh, good morning, Y/n!"


"GOOD MOOOOOOOORRNING!" You shouted as you took off with a huge jump. The sisters look in shock and fear.


"AAAAAAH! HE JUMPED TO HEAVEN!!" They shouted and you landed in the forest.


You looked at your back. "Hey, are you okay, Nez?"


She scratched the box and telling you she was fine. You looked at the book, finding all the herbs took at least till late afternoon when you came back to the mansion. You saw Shinobu and the sisters looking back at you. "Here, these are it."


She nodded with a smile. "Certainly, but you did take longer than I expected."


The sisters cried as they all tackled you. "WAAAAAAAAH! Y/NNNNN!!"


"HUH?! WHAT?! GET OFF!" You shouted as you tried to remove them but gave up quickly.


"WE THOUGHT... we though you jumped to heaven!" one of them said as you sighed.


"I'm not going anywhere, at least not yet." You said as they smiled and hopped off. You gave Shinobu the herbs and she finished the poison. And once that was done, you walked outside with her as well.


"So what's the actually training looking like?" You asked Shinobu as she waved her finger.


"Nuh uh uh, Y/n. It's all knowledge you need if you're gonna master this Breathing style." She said but still handed you a paper. "Aoi helped me with this considering your demon capabilities."


'Y/n's training to Insect Breathing:


Monday:  Circuit A


Tuesday: Endurance Training


Wednesday: Circuit B


Thursday: Endurance Training


Friday: Circut C


Saturday and Sunday: Sparing with Kanao.'


"So basically get my ass handed to be for two days in a row..." You looked at Saturday and Sunday. You then looked at the rest and didn't even know what some of these were.


'Circuit A, Complete 3-5 Rounds:


150 Jump Rope Skips, High Knees, or Toe Taps


60 Air Squats


100 JR, HK or TT


50 Sit Ups


50 JR, HK or TT


50 Push Ups


50 JR, HK or TT


15 Tricep Extensions


50 JR, HK, or TT


50 Wall Climbs


Endurance Training: Advanced: 5+ Miles


Circuit B
Complete 3-5 Rounds:


150 Jump Rope Skips, High Knees, or Toe Taps


60 Sit Ups with Twist


50 JR, HK or TT


50 Decline Push Ups


50 JR, HK or TT


20 Glute Bridges


50 JR, HK or TT


30 Plank to Push Ups


50 JR, HK, or TT


50 Chin Ups


Circuit C
Complete 3-5 Rounds:


150 Jump Rope Skips, High Knees, or Toe Taps


130 Wide to Close Push Ups


50 JR, HK or TT


25 Box Jumps


50 JR, HK or TT


40 Lying Leg Raises


50 JR, HK or TT


50 Dips


50 JR, HK, or TT


60 Wide Grip Pull Ups (or Pike Push Ups).'


"I'M GONNA FUCKING DIE!!!"
You gripped the paper in worry. "SHE SAID SHE INCREASED IT DUE TO ME BEING A DEMON BUT MY HOW MUCH?!"


And so, the training arc begun.


You were seen with the three sisters as they span the vines you found in the forest fast. "100! 102! 104! 106!" "Are you girls counting by twos?! That means I still got half to go!!!"


You then did the air squats and you could definitely feel it in your legs. And after that it was knee highs, that was rather easy. Unti... "Higher!"


"Huh?" You looked at Shinobu as she smiled.


"If you can do it with ease, you're not doing it right."


And so you did as told and you could feel your muscles stretching. It was almost if your demon side wasn't helping you at all during this process. After that it was just sit ups, over and over and over again. And you pushed through it all, and you were out of breath. "You can do it! Nice first run!"


"...First...?" You looked at the Paper again, and it did indeed say 3-5 rounds. You got up. "AHGHHHHHHHHHH!!!"


At least Endurance Training was much easier than the others, actually when those days came... you loved them. You weren't breaking your back or running up walls. Just leaping and running to get to a point. Nezuko even did some of the training with you at night so you both got stronger. Unfortunately, Saturday came quicker than you thought. You were approached by Kanao. "..."


"...Do you need something?" You asked her as she seemed hesitant. You couldn't tell if it was because you were a demon... but you assumed it was because you almost killed her when the two of your first met. You were timid as well, knowing just by looking at her that she was on your level if not more. You grabbed your sword and looked at her. She quickly put her hand on hers in her sheath. "Thank you for agreeing to help me."


She nodded and smiled a bit. You then decided to see how powerful she really was and quickly drew out the Tessaiga but didn't transform it. She proved to be a formidable foe instantly as you immediately had to block a strike before yours even connected. "Hehehe, alright. I should never start out by testing. This is training after all, and I need to treat this as a real fight...!"


She nodded again and still didn't say anything. You dashed towards her and she did the same. You went for a low slash but she seemingly predicted this and hopped over it before turning the blade downward, you smirked and went to kick her but she dodged it again. You pushed off the ground with your hand as she went for a similar low slash before she jumped extremely high incredibly fast to catch up with you. You smirked and you immediately span your body to the left in the air, she missed her attack. You slammed the transformed Tessaiga into her blade and pushed her back to the ground. You used Demon Breathing 3rd Form: Whirling Death to twist your body into a vertical spin aimed for her. The Tessaiga generated an effect of swirling demonic energy around it. You sped at her incredibly fast but she side stepped the attack, making you slam the attack into the ground... or so she thought, you then twisted your body at the last second to spin your blade instead of your body after you reached the ground, deflecting Kanao's thrust at you.


"She's super powerful! And if I'm going to win, I need to stop her vision. She's predicting my movements, Urokodaki did the same thing so it's nothing new to me. Observing the subtle shifts of my muscles, joints and the slight movements in my eyes. This allows her to make effective counterattacks and dodges and stay ahead of her opponents." You smirked as you closed your eyes. "Unfortunately for her, I trained my senses to the max. I doubt I'm going to win, but I can adapt!"


"Oh~? Did he figure it out already?" Shinobu watched from afar. "I must give more credit to his observation skills."


You used your demon form and harnessed it, Kanao immediately sensed something changed and tried to strike at you. You dodged at the last second so she could predict your moves. She went for another thrust and once again you used your smell to find her. You blocked her attack at the last second and countered with a kick. But Kanao was extremely fast and every time you pushed her back, it was almost as if she never left. You went for a neck slice, knowing she'd block it to which she did. You then span the Tessaiga around, forcing Kanao to keep a steady grip as you headbutt her. The unexpected attack sent her back but not injured at all. When she looked back up, she didn't see you. "Her speed and reflexes are definitely faster than mine. Not to mention her stamina and endurance are off the charts. I can't even question why she isn't out there fighting with us."


You used Demon Breathing 1st Form to hit Kanao without touching her by three firing small concentrated waves of demonic energy at her. Kanao saw the attack but not you. You then used Demon Breathing 5th Form: Adamant Barrage. The Tessaiga fired a barrage of diamond shrapnel that went at her. She used Second Form: Honorable Shadow Plum. She released several rotating sword slashes that deflects incoming attacks. She then dodged and ran away from the ones she couldn't dodge in time. You immediately appeared at her side and used Demon Breathing 8th Form; Demon Dragon. A powerful burst of demonic energy was released and took the form of a dragon, which rested on the blade of Tessaiga. You then slammed the blade on Kanao's sword, but she couldn't think of a way out except blocking. The quick and devastating strike, sent Kanao flying through some trees and she didn't have time to recover as the next attack was on its way. All she could do was block as each strike sent her back. She recovered by shifting her feet the moment she hit a tree and pushed off of it, immediately using Fourth Form: Crimson Hanagoromo. You were on guard as she unleashed single sword slash that curved and twists gracefully. You retaliated with First Form which canceled the attack out.


You both landed on the ground and Kanao immediately dashed at you, but she noticed you were slowly getting better. Even though she was predicting you the same, you were getting faster... but you were simply training your demon form as it was growing stronger. Perhaps it was your human mind with a demon body that allowed you to keep surpassing yourself, but either way, it was helping you. Kanao used Fifth Form: Peonies of Futility. She unleashed a flurry of nine consecutive attacks that flowed and weave in on themselves, which you quickly dodged and looked for an opening. You slammed your foot into the ground and swung the hilt of the Tessaiga at her, which she effectively blocked, to which you than span the sword before gripping it and using Demon Breathing 2nd Form: Wind Scar. The burst of energy pushed Kanao back and destroyed some of the forest. You looked down and wondered if you went too far, Kanao came back bleeding but still wanted to train. She must not train with Shinobu, so you figured you'd honor her wishes.


You went at her and she got a cut on your side to then you then smirked and used Demon Breathing 6th Form: Demonic rampage. You dashed towards her at incredible speeds. Once in front of her, you started attacking her three times. She gripped her sword as you unleashed one strike vertically which she got hit with, one diagonally which she blocked and jumped over, and one last devastating horizontally blow upwards which she had to block in midair sending her back. Not wasting anytime, you chained them next form, Demon Breathing 11th Form: Demonic Illusion. You creating afterimages going after Kanao. She was confused a little before going to strike the multiple afterimages when they all suddenly disappeared. You were seen in the sky, harvesting your demonic energy and unleashing it all in a devastating slash that shakes and distort the air around you. Kanao quickly blocked upwards as the strike cracked the ground and left a crater.


"Okay, that's enough." Shinobu said and you both stopped. You put your hand out.


"That was fun! Thanks for not holding back on me!" You smiled as Kanao smiled back and bowed. She then walked away as you looked at Shinobu. "...?"


"I wouldn't worry about it, Y/n." Shinobu said as she looked at Kanao looking at her sword. "In fact, I think you inspired her to work harder."


You put your hands behind your head. "I think she needs to lighten up more."


"Hmmm..." Shinobu just hummed. And soon, a month flew by. You quickly got in a routine of waking up, studying poison, working out and practicing the moves. But you couldn't use Insect Breathing no matter how hard you tried and trust me, it was a month before your stubbornness was noticed by Shinobu. "I warned you it might all be for nothing."


"It's not all for nothing." You swung the sword again at night as Shinobu approached you. Miki, the three sisters, Aoi and Kanao watched from afar. You swung the sword at subsonic speeds to the side. "I've been getting stronger from this, but I need to change something."


Shinobu smiled and walked away as Kanao is confused. Shinobu stands next to Kanao. "Kanao, you should keep an eye on Y/n with me in case anything interesting happens."


Kanao's face had much confusion to your motives, visibly not understand why you are so hard. Shinobu chuckled. "Haha, it's okay if you don't understand Y/n, it doesn't seem like an easy thing to do. But at the same time, he's so see through."


You started moving faster and faster with your swings as you imagined demons attacking you and you fought them. Shinobu continued. "Y/n is the type of man to see things through to the end, even if he's the only one to do so. I don't believe he cares about the statuses of the Hasira's, Upper Moons, even Muzan. All Y/n cares about is protecting his family and friends, no matter who they are or how significant they've hung out or talked, Y/n sees almost everyone as his friend, that includes you and I, Kanao."


Kanao started to understand more as Shinobu looked back at you. "And so, Y/n trains in order to protect them, and I suspect he knows the only way to stop that is going through Muzan. He may be a bit to foolish to push himself to the limit, but that's how we humans have evolved."


Kanao felt the air shifted as Kanao noticed you stopped moving. Shinobu Shinobu smiles, knowing you were finally understanding. You gripped the Tessaiga and panted. "I can't use Insect Breathing, it's not use. It won't work for him because I am actually able to kill the demons."


You looked at the makeshift poison holder you added to the Tessaiga, but it made you not be able to transform it. It would break otherwise. "So you're giving up?"


"Mom..." You saw Moroha, your mother as she sat down.


"I was going to give you my sword as Miki already had my bow and arrows, but with that spirit, I might as well just give it to Towa." She said as you looked at her.


"Oh yeah? Go ahead, it's not like you can give it to me anyway." You said as you kept swinging. She twitched her eyes in annoyance and kicked you down. "OW! WHAT THE HELL-?! AREN'T YOU A GHOST!?"


"Spirit Yokai, but that's presides the point." "No I think that's pretty important to discuss." You interrupted her as Miki smiled.


"Looks like she finally got the guts to talk to him." She said as Kagome smiled with nod.


"It was only a matter of time really." Kagome said as she looked at the roof. Inuyasha was watching you carefully.


You got back up as Moroha pointed to your chest. "Think back to when you started this journey. Miki was working on the train, you had the seal on, and you were normal. Even if you had the seal unlocked, without the people around you, you would've died at the waystation. Think about the whole reason you wanted this training and use it to create something new."


You nodded as she smiled. "Thank you, mom." You ran up and hugged her as she was taken back. "I'm sorry I never got to know you..."


She went wide eyed before she smiled and hugged back, closing her eyes and ruffling your hair. "It's fine, kiddo. We'll meet again after it's all over."


She then broke the hug and whispered the location of her sword. "Huh?! Why would you keep it in a Blacksmith Village instead of with Miki."


"Your aunts were insistent that I didn't keep the two together." She said before she started to fade and walk away. "Remember my words, Y/n. I love you."


"I love you too mom." You said as the others disappeared too. You look at the Tessaiga on the ground. You picked it back up and Nezuko came out, looking at you as you close your eyes. You gripped your sword as the demon energy mixed with the poison to make it bigger and expand. Everyone looks at your blade and it looks like it's dripping with purple posion as it drips on the ground. You took a brand new stance, the Ko Gasumi. You thought back to all your friends and mentors, all your enemies and allies."Poison Breathing First Form: Y/n's Claws...!!"


You swung your sword forward in a blur multiple times, forming a very large amount of poison in five massive waves shaped like a claw. The claw shaped slash then slammed into the tree with great blunt force, and started to eat it away. You looked at the attack before you leapt up in the air with a smile. "YESS!! I DID IT!!!"


Nezuko lit up and dashed towards you before you could see her. She hugged you and tackled you to the ground hugging you. You were worried since your new Breathing style was all about poison. "Wait! Don't get too close! I'm not sure it doesn't have any lasting effects!"


She hugged both anyway, humming in a way that told you a good job. The others couldn't help but smile as well as Inuyasha smirked. "Watch out, Muzan. My grandson is gonna be a thorn in your side."

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