I'll Protect You Forever (MUZAN X SISTER OC)

A basket of Ume

Quick A/N: first, yes the header is a picrew. I shall introduce my own art slowly when I'm more comfortable. Second, I'll go over their lives with a five year time skip each time (before they became demons, then it'll be more random and then slowly stay in one area thanks to the main storyline), the exception being after Seiko turns 15 the next time skip is going to be when she's 18. Also because there isn't a lot of information off of the heian era in general I'm going to be basing most of the small heian including details in these next few chapters from The Tale Of Princess Kagura and questions I've asked Japanese expert Let's Ask Shogo on Instagram. This picrew isn't historically accurate due to it being made before I asked Mr. Shogo about the attire back then, I'll draw her more accurately at a later date! Now on with the story! >-<
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5 years have passed since their birth. The lady was very lovely and energetic and considered the hope of the household, everybody believed that she'd bring good things once married off despite being barely 5 years old. Whereas they looked at the young master, Muzan, with pity. Thanks to his simple, heinously ill condition, the Master of the house no longer even looked at the Mistress to try to conceive another son. He found her disgusting because she gave birth to muzan and only talked to her when required. The servants knew that it was absolutely dire that they tried for a new son but the mistress was okay with having just muzan as an heir. She said that if he died, she could just marry a man into the household Via Seiko. This always left the servants absolutely gobsmacked, but she didn't care. She was fond of her children, and for once, the cold hearted mistress of the house smiled.

There was a small pitter patter of feet as she ran up to the entrance of muzan's bedroom after loosing her own attendants in the house's huge layout. Upon being confronted by Muzan's 2 attendants placed at his door she simply said, "Hey! The doctor says a growing girl like me needs a lot of sweet things to grow up! So why can't it be the same for brother?" She kept pouting as she firmly stayed at her position and the maids, who had already loved the lady so much, gave in as the reluctantly let her in. As soon as they opened the screen doors she hopped in and shut them right back, dropping a single plum in the process leading to the stoic, cold faced maids, giggling in amusement.

There he was, right behind that screen covering with painted flowers and birds, you could see his small body, seated up, staring at the light from the other side. It was spring, and the air was sweet and the garden just outside his room was blooming. There where hydrangeas, chrysanthemums, tiger lilies, camellias, a patch of baby blue eyes, a small bundle of beach roses, and some andromeda. Little Seiko quickly jumped to the other side of the screen separator and pretended to scare him as he turned around to look at her. He stiffly smiled as she cupped his face with both of her hands and began to hyperactivity ramble about how pretty everything in life was, not that he'd know of anyways considering he'd never seen past his room or his garden. He was rather sick of life, but had a strong desire to survive and conquer any ailments that where thrown at him despite this.

     "Oh! Oh! Hey eat this brother!" But before Muzan could even respond a fruit was shoved into his mouth, to which he reluctantly chewed with a small smile on his face. "Mama says that if you eat good things you'll grow up nicely and become a good person! So from now on you're eating plums everyday because I think they're cool!!" She said with a big, triumphant huff.  This made him burst out in hearty laughter, despite his doctor telling him constantly "too much excitement isn't good for you!" He had a genuine grin on his face now as he spoke back to her, "But I cant eat plums every day Seiko, they're not always in season." This made her pout as she walked out onto his garden and picked a single camellia blossom, walked back to him, and placed it into his hair. "Look, it's really red. Just like your eyes. You know brother...nanny says that these flowers are able to thrive and stay abloom just like this even during winter...I want you to grow tall with me. I want you to be able to go with me anywhere I want. I want you to live a long life just like this flower, so make sure you eat lots of good stuff okay?" She said with a small smile. "And, once these flowers die their meaning turns into noble death, which is the kind of death I wish for you to have. Nobody can die a noble death if they haven't lived long enough for it! So make sure you grow up lots and lots, okay brother?"

     This made him open up his eyes a little bit and stare at her in wonder, it seems as if she had been learning really hard while he was stuck in bed, coughing up mucus and blood every week or so. This thought made him want to grow up with her just as she had wished, so to reassure her he grinned softly as he cupped her face.

"I promise Seiko. I'll grow up nice and tall, and I'll protect you forever."

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A/N: GRAAAAAAAAAHHHHHH AUTHOR TYPED UP ANOTHER CHAPTER IN ONE DAY!! sorry if it's nit the greatest chapter in the world guys, but I tried! The chapters will get longer once we get to the main story and seiko's garden building arc, so make sure you stay for the ride! I hope you'll enjoy this book as I've put in my best effort ever! Have a nice day guys!!

Your silly author,
HanHan