What If, Sabito Never Died (Demon Slayer AU)

The Sorrowful Wedding

“What do you think I should wear?” Tsutako was holding out a couple of outfits to her little brother, Giyuu.

“You can wear whatever you like, you know.” Giyuu wasn't quite interested in picking outfits for her.

“I'm getting married today! Can't you at least pretend to be interested?!”

“Okay fine... How about...” He picks out a pink haori, “...this one?”

“It's quite...simple. It's a plane pink haori...but, no problem. That'll do just fine.” said Tsutako.

Giyuu used to live with his sister for as long as he could remember.
Their parents had passed away when he was really young.
Today was the day her sister was getting married. He didn't showed it but he was actually happy for her.

Initially, everything was alright. But soon after Tsutako was about to get dressed up, they heard screams coming from outside.

She peeked outside the door to see what had happened.
There standing, was a demon, devouring everyone he could. It won't be too late until he notices this door here and might break into her room.

“Tsu-Tsutako Nee-San....?!” she heard her little brother's worried voice.

Her little brother.... What about him? She had to protect him from this monstrous being. She couldn't let it devour her only family left.

“Giyuu...” Tsutako called out to him, “....hide in here.”

She hid her brother inside a small and dark room, more like a basement, which didn't caught much attention from everyone.

“But...What about you...?” Giyuu asked. His voice still sounded worried.

“You know that I can't fit in there.” she said.

“No...”

“Just stay... stay in there and don't make a sound!”

He did as his big sister told him. He didn't made a single sound.
After a lot of time... when Giyuu finally came out of the hiding, he saw everyone at the wedding covered in blood. No... They were lying in a river of blood!
Including...his sister.

Today was supposed to be a happy day...her happiest day ever. Yet, THIS happened...

“Poor kid.... Surely, he is so traumatized by seeing all the dead bodies..he doesn't even realise what he's saying. Or, his mind is probably playing tricks on him. I think, he needs serious help.”

“But... I saw it! There was a demon...”

“There is no such thing as demons.”

No matter how hard he tried...it was no use. No one believed him.