On a cold, winter day, the first time Tanjiro accompanies his father to the town at the base of their mountain home, they encounter a very hungry, very angry, very lonely Genya.

Giyu cooked ohagi for Sanemi. Sanemi took Giyu out for salmon. or) snippets of post canon queerplatonic SaneGiyuu

After supposedly dying at the hands of Upper Moon One, Genya finds himself shot 500 years into the future, and into the body of a hot headed teenager with an all too familiar voice.

On the eighth of February, a child with bright blue eyes and strands of ebony hair is born in Nogata. He is the second of two children. On the twenty ninth of November, a child with starkly white locks and strangely defined eyelashes is born in Chuo. He is an only child, but dreams of a little brother. For whatever reason, they remember their past lives. SaneGiyuu BnHA Reincarnation fic

the AU where Genya doesn't die after the battle with Kokushibo because of sheer stubborness.