Archive of Our Own ^beta

Chapter Text

 So uhm, hi! This is a Giyuu kibutsuji book, as well as a Giyuu and Aoi sibling relationship. So basically the three tomioka's or, kibutsuji-tomioka's, are the children of Kibutsuji Muzan (Obviously) And Rei Kibutsuji(Muzans *fake wife idk if thats her name tho). So like- A bit after Aoi, the last child was born, Muzan killed Rei. And so he took the kids to the care of his uppermoon demons (Ik this makes no sense but pls bare with me). So, Daki and Nakime ended up taking care of them the most, as Muzan didn't trust the other uppermoons as much. The kids loved Daki, (T: 12, G: 6, A: 1) as she had them play cool games and stuff, while Nakime was the one who had fed them and put them to bed and took care of them and stuff while daki was working. So uh, find out the rest as you read through the story! (This makes no sense I'm gonna kms this is so mischaracterized)

Chapter Text

February 7th, 18XX.

It was just a Normal day for the Kibutsuji family. They had gone out for a walk together when it started getting dark. Muzan said it helped with the pregnancy. It was around dinner time when they got back home (Like around 8:00 or smth. It was dark out), and Rei started to make dinner, while Muzan went out to do something alone(his human dinner😼). Just as Muzan had come back home, he heard a loud gasp coming from the kitchen, so he quickly walked over to the kitchen. Once he entered  he saw his wife standing over a pool of something, and Rei's eyes were wide open. It was just then that Muzan had realized Rei's water had just broken.

Tsutako's POV: 

"Where are we going daddy?" I asked him. I was just playing around with my stuffed bunny, when daddy said we had to go somewhere. "Your mommy's having a baby!" Daddy said with a smile on his face. "Really? Baby brother is finally here?" I said with excitement. I was really happy because i'll finally be a big sister! I'll share with my toys and take really good care of him! Just then we pulled up to a big building, and daddy help mommy out of the car (those old fashion cars or smth they had idk). We went inside and Daddy started talking with another person. Then they took us into a room and mommy was changed into something. We were there for a long time. It felt like hours had past.(it's actually like 10:53 but she's 6 ok?) I started feeling really tired, then some nurses came into the room and I could hear mommy crying. I covered my ears while being held by daddy. Just then I fell asleep. 

February 8th, 18XX

Rei's POV: 

"You can do this Rei, I just need you to push a little harder sweetie." Is what the nurse was telling me. I've been in labour for almost 2 hours. It's worse than when I had my first. Tears were streaming down my face from all the pain i'm in. Giving birth isn't easy. I've been holding his hand this whole time. It just hit 1:00. The baby's slowly coming out. About 30 minutes had past when I finally heard the sound of crying. Then they placed him on my chest. My baby boy. Then they took him again. They had to clean him up. After a while, they brought him back. I tried to get him to latch onto my breast so I could breastfeed him, with the help of a nurse. After I finished, the nurse asked,"So, you guys thought of any name for the baby?" I responded, "Yes actually, we've decided on the name, Giyuu, Giyuu Kibutsuji-Tomioka." I said with a smile plastered on my face as I stared at my newborn baby. "That's a lovely name, I'll go write that down for you guys." She said as she walked away. "He's beautiful." I said. "He looks like like you." Muzan said. The baby then opened his eyes. Beautiful blue eyes. "He has your eyes, just like Tsutako." I said as I looked up at him. I then yawned. "You tired hon?" He asked. I nodded my head. He took the baby from my hands and him in his crib. I then closed my eyes and fell asleep.

Chapter Text

Tuesday, July 31st, 18XX

It was a normal day. Everyone was peacefully sleeping until the beautiful silence was broken with the sound of loud crying that awoke everyone from their sleep. It was Giyu, and he was hungry. Rei had gotten used to the routine. 7:00 am, wake up to a hungry baby and make a warm bottle, and then feed the baby. 8:30 am, once everyone is fully awake, start to make breakfast while the baby is being watched and taken care of. 9:46 am, get the kids ready for any errands they were doing that day. 10:50 am, actually leave the house. Today was grocery shopping day, Rei's least favorite day of the week. 

Rei's POV: "Ooo Mommy can I get that?" Tsutako asked as she pointed to one of the candies on the shelf. "Sorry sweetie but mommy's only here groceries, maybe we can get that on the weekend okay baby?" And as I said that, she pouted. We walked towards the dairy section of the store. "Hey, how about we buy some ice cream instead, how does that sound?" And as soon as Tsutako heard that, she perked up and a big smile formed on her face. "Can I choose the flavor?" She questioned me. "Of course," As I nodded my head she sprinted towards the Ice cream section. While she did that, I headed towards the milk. After 5 minutes or so, Tsutako came back with a small bucket of ice cream, enough to last for at least a month. "I didn't know which flavor to pick so I just chose Oreo!" Tsutako said as she dropped the ice cream into the cart. "And we got everything we need! Let's go to the checkout." I said as we walked towards the checkout. The cashier got everything and we paid. 

We started walking home. I expect the house to be clean by the time we get there. "Mommy?" I Looked down at Tsutako,"Yes sweetie?" I responded, waiting for her to ask her a question. "What are we having for lunch?" She tilted her head as she asked. "How about we make... some rice balls? That'll fill you up until dinner for sure!" Her smile reappeared on her little chubby face. "Can I help make them?" She asked with joy in her voice. "Of course sweetheart." We then continued to walk home and Tsutako told me all about her friend, Tsuki. She was a short girl and had beautiful, chocolate brown hair. Her eyes were a beautiful, hazel eyes. She and Tsutako have been friends for almost a year now. Once we got home, Tsutako ran inside to hug Muzan, while I put all the grocery bags on the table. After I did that, I picked Giyuu up from his stroller and started making a bottle for him. Once it was done, I went to the living room and sat down on the couch to feed him. He was a quiet baby, he never cried unless he was hungry. He seemed to like sleeping, alot. Muzan then came into the room holding Tsutako, who was telling him all about our shopping trip. "-And we also bought ice cream!" She finished saying. "Sounds like you had a good time princess." He smiled as he put her down and looked over at me. "Need some help?" He asked,"Yes please, I need to make Tsutako's lunch." He chuckled at how quickly I responded when he asked. He walked over and took the baby from me and sat down, meanwhile I got up and walked to the kitchen with Tsutako. "Okay, what's the first step to making the rice balls?" Tsutako and I then made the Onigiri with her telling me what to do. And they turned out amazing. "These are delicious princess." Muzan said towards Tsutako as he ate one of the rice balls. "See mommy? I told you I knew how to make them!" She exclaimed. "That's nice."

Chapter Text

(I lowkey forgot the year and I'm too lazy to go back and check)

Many years had past, Giyuu is now 4 years old and Tsutako is now 10. Things have, changed, in their household. Muzan started yelling at Rei and the kids more after he found out Rei was pregnant with their third child. A month before now, Muzan had even started hurting Rei. The kids had noticed the change in their father's behavior. The two had started hiding in their room more and more since then. Now, Rei was around 37 weeks along, meaning she could burst anyone of these coming days now! The kids are excited about their new baby sister, but they worry about what their father will do to their mom, and even worse, the baby. They chose the baby name "Aoi" for their sister. 

The two kids were called over to the main living room by their parents. Rei was dabbing her eyes with tissues as some more tears formed. Muzan sat next to her with a serious face. The kids sat across from them. "Mama? What happened, why are you crying" Tsutako asked. "You two, listen up." Muzan said, "Once your sister is born, we'll be sending you three off to another village, meaning you'll have to take care of Giyuu and Aoi, you hear me Tsutako?" he explained, glaring at Tsutako. Their eyes widened in shock, "What!? Why?" Both of them shouted out. "QUIET, and it's because I've been in some, how do I say it, trouble. So me and your mother have decided that it's best that the three of you live far, far away, for your safety," He explained to them, in reality, Rei had found out about his little, demon shenanigans, and he threatened her to not say a word. Rei had first thought about the kids, and asked to protect them and to not let them get hurt, Muzan had agreed. "B-But how am I gonna take care of them?! Of myself?" Tsutako asked, not wanting the responsibility of two kids. "Well, i'll send you kids off with enough money until you're old enough to have a job yourself, and once your sister is born, i'll get you guys a nice village house." He explained as Giyuu ran to Rei's arms. "It's for the best baby.." Rei whispered as she stroked Giyuu's hair. 

Aoi was soon born, and as Muzan had said weeks prior, the kids moved villages. Giyuu now had to go to the market to get food for his sisters while Tsutako took care of Aoi. Their neighbors felt pity for them, and they all chose to help them whenever they could. Over a year had past and they were now used to this life. Aoi was now 3, Giyuu was 8, and Tsutako was 13, turning 14 soon. During one of his grocery runs, Giyuu had accidentally ran into a boy, somewhere around his age. The boy had tanned skin and pale white hair along with pale purple eyes. "I'm sorry, I didn't see you.." Giyuu apologized to the young boy and ran off back home. Later that night at dinner Giyuu told Tsutako about it. "Nee-san, I bumped into a boy at the market today, he looked like he was my age. Do you think he would be my friend?" Giyuu asked excitedly, "Well giyuu, I think he would be your friend, you're an amazing kid!" Tsutako said as she helped Aoi feed her self. "Do you really think he'd be my friend?" he asked, not very sure about his older sisters answer, "Yes Giyuu, I think he'll really want to be your friend, now finish eating it's almost time for you to go to bed." She said as she wiped Aoi's mouth, "And you are getting a bath, stinky!" She said in a baby voice to Aoi.

The next day, Giyuu went out to look for the boy from yesterday. He found him near the river, sitting alone. He walked up to him, a bit nervous. "H-Hi, i'm Giyuu, and uhm, I'm really sorry about yesterday, but I was wondering uh, if you wanted to be my friend?" He asked the boy. The boy looked up at him and smiled. "I'm Sanemi! I'll gladly be your friend! There's not many people my age around here, so it's kinda lonely." The boy introduced himself. "Well, could you uhm tell me more about yourself?" Giyuu asked as he sat down next to Sanemi, "Sure!" After that, they sat there talking for hours on end.