Giyuu Nii-San

This is another AU. Tomioka Giyuu is an older brother of a 10-year-old brother. The disclaimer is that I do not at all own the Demon Slayer series, their proprietary is Koyoharu Gotoge. I only own this plot and my OCs, Tomioka Kyuu and Akira.

"Tanjirou! What is going on in there?" Zenitsu cried out to his friend, followed by Inosuke. It was dark and already night, the three Demon Slayers got in a battle with a not very high demon, it was just a rookie. But when Tanjirou fended it off, something got his attention. A small boy, with spikey dark hair was cowering in there. Tanjirou believed he looked like the Water Hashira, Tomioka Giyuu, his mentor and the Hashira he had a high respect for.

"I found a boy!" Tanjirou replied, crouching down to said boy. "Excuse me, are you all right there?"

The boy nodded, but still was shaking, he had been chased by the demon for long now. Tanjirou still thought, the resemblance with Giyuu this boy had was undeniable.

"What's your name?"

"I'm...I'm Tomioka Kyuu..."

Tanjirou's eyes widened and his jaw dropped a bit at the revelation the boy just told him. A Tomioka? Giyuu's son? No, impossible, Giyuu was like 19 and didn't have a mate, and wasn't even interested in building a family of his own. But he knew he was quite interested with that nice, redheaded woman, Akira. That was undeniable, the only person besides Tanjirou, that the Hashira showed a soft personality.

"Kyuu-kun... Your last name is Tomioka. Do you by any chance know, someone by the name Tomioka Giyuu?" Tanjirou inquired, wanting to know what was the relation he had with Giyuu.

Kyuu slowly nodded his head. "He's my Nii-san. I never met him, but I knew I had a Nii-san and a Nee-san. I was hidden for the major part of my life... I never met Giyuu-Nii-san, but I could meet Tsutako-Nee-san. I've been trying search for him, maybe he's still alive."

Tanjirou placed a hand on Kyuu's shoulder and smiled softly at him. "He is very much alive, Kyuu-kun. I know him and respect him dearly."

Kyuu's blue eyes widened. "Can you please take me to him? I want to meet him finally!"

Tanjirou nodded and straightened. "Of course. But it seems that you sprained your ankle when you were running from that demon, you'll need some medical treatment for that. I can carry you." He kindly said, turning and crouching down so Kyuu could climb up. The boy got helped by Zenitsu who helped her on his back. Kyuu shakily held on, he looked so frail and sickly and pale, which worried Tanjirou and Zenitsu, Inosuke wasn't worried at all. Instead quite annoyed with the two of them taking in a random child.

"Tanjirou are you taking him to the medics after showing him to Tomioka-san?" Zenitsu asked, worriedly for the child's health.

"Of course. He seems pretty pale to me." Tanjirou stood up and Kyuu gripped him weakly, letting out a cough.

"It's a waste of time!" Inosuke as usal complained. "Why don't you just leave that brat here!" The boar guy, who ironically had a feminine face growled out, vapor coming out his nose. Kyuu whimpered at that.

Tanjirou scowled at Inosuke. "Shut up. You can easily walk ahead of us. But I will help this poor boy." He said bluntly and sped up ahead of Inosuke with Zenitsu along side. Inosuke was left shouting as he usually did, not happy he was left out.

Meanwhile, Giyuu was off walking, after all the Hashira's finished the meeting with the Master. When he heard Tanjirou's voice calling out for him and he slowly turned to the direction. It surprised him to see, as Tanjirou got closer the boy on his back, who was that child? Did Tanjirou save him?

"Tomioka-san! Have a moment to spare?" Tanjirou asked and stopped before the Hashira.

"Of course. Go ahead, Tanjirou. What is it?" Giyuu asked calmly.

"Giyuu-Nii-san?" Kyuu spoke before Tanjirou could and Giyuu widened his eyes big.

"Excuse me? Do you know me?"

"Tomioka-san, he is your little brother, according to his explanation. A demon was after him and I saved him. He said he knew you were his brother, but never met you before, but he met Tsutako-san." Tanjirou explained and Giyuu was in shock, lots of feelings mowed his mind. Why wasn't he introduced with this boy who apparently was his little brother. Why did Tsutako never told him they had a younger brother. Giyuu shook his head and approached closely.

"What's your name?"

"T-Tomioka K-Kyuu..." Kyuu answered his older brother with a quivering voice. He quivered and his blue eyes formed tears. Giyuu immediately softened his sharp gaze.

"No need to cry. I merely asked you who were you. But since now I found out my younger brother." Giyuu picked him up from Tanjirou's back and gently held him. "It's my responsibility to care for you." He looked at Tanjirou. "Thank you, Tanjirou. I shall take over from now." He disappeared out of Tanjirou's sigt and the other younger boy nodded.

"No problem, see that he gets better, Tomioka-san!"

Giyuu hurried to the Butterfly State to ask his fellow Hashira, Shinobu. As much as it annoyed him, but he didn't know where else to go.

"Kocho. Something happened. Apparently I'm not the only Tomioka here. Tanjirou found my little brother. He's bad, sprained ankle and unknown disease." The Water Hashira told the Insect Hashira urgently, or as his monotonous tone sounded. Kyuu gripped Giyuu, whimpering, he had been tearing up silently all the while, both fearful and happy his brother accepted him quick, he was thinking that Giyuu wouldn't see him as his brother, but apparently, he was way more caring.

"Ara? That's surprising. But yes, over here." Shinobu led the way to an empty room as Giyuu held his brother close and soothingly, walking hurriedly after Shinobu.

"It's going to be all right, Kyuu. I'm here."

Shinobu thought there wouldn't be the day Giyuu would sound so caring and compassive, given the man was simply an unreachable stone of no-emotions. But turned out Giyuu was very emotional, but only with a few people. She pat the bed for the Hashira to lay his brother down. Kyuu whimpering and started crying scared, Giyuu frowned and layed a hand to the kid's cheek and rubbed softly.

"It will be okay." He soothed as Shinobu took a syringe and gently injected the boy's ankle for it heal quickly. Kyuu bawled his eyes out when at the feeling of the sharp needle being administered. Giyuu patted his cheek softly, comforting the crying child. Shinobu started bandaging the ankle to up the leg gently. Then she left to prepare a remedy for whatever diseased this boy had.

"It's okay, it's all right. You'll get well soon, Kyuu-kun." Giyuu soothed him and wiped away the tears with his sleeve. He was worried for his brother's health, just recently found out he had family somewhere, he was going to protect Kyuu with all his life.

Kyuu sniffled and nodded, the needle did hurt but it was effective the pain in his ankle was slowly going away. Shinobu came back with the remedy.

"I'll need you to drink this for me, Kyuu." Giyuu held the glass close to the boy's lips, helping him drink. The boy drank without issue and his brother smile a little. "Good boy." He praised and patted his head.

"He'll need to rest for a bit here, I'm sure the next day he'll be like new." Shinobu assured and Giyuu nodded, movie a chair to sit next to his brother.

Kyuu felt secure now, Giyuu was nice and caring with him, he didn't feel intimidated at all, in fact very loved. His eyelids started to get heavy and he fell right into a deep slumber.

Giyuu kept rubbing his cheek, a very soft smile plastered in his face and Shinobu thought that was a big rarity, she left the Tomioka brother's to themselves, she would come back if she was needed, but for now the situation was under control.

"Shinppai-shinaide, Otōto." Giyuu whispered. "I'll take care of you, got my promise."

This AU is a different time from the time in New Hope, New Beginnings.

Shinppa-shinaide means "don't worry" and Otōto means "little brother".