Demon slayer Fanfic "The story of the Speed and Nature Hashira"

In a Snowy village in the mountains lived a family of four the father and mother we're both gymnastics and they had two children who wanted to be just like there parents one was a brown skinned boy with red hair and a scar next to his eye and had red eyes and a girl with ombre hair half black half red with yellow eyes but what the children didn't know about there parents was that they were both highly skilled Hashira of the Demon Slayer corp to keep there children from getting involved in the Demon Slayer corp and the man eating demons they kept there double life a secret from there kids until one day the village was massacred by the Upper Rank 3 Demon Akaza who followed the two Hashira home the lone survivors was there children Ari and Agana after these terrible event the two were determined to find the demon who is responsible for killing there Family, Friends, and there Home and make him PAY!!!