(You were walking back up the mountain to your home after selling charcoal- your family were charcoal sellers- you then smelled the scent of blood on your way up. You had a keen sense of smell. You quickly ran up the mountain and saw your whole famaliy covered in blood. All dead, you didn't have time to cry as you felt that your sibling's body was still warm. You carried them on your back but slipped off a cliff on your way due to the snow. You got up in search of your sibling and there they were, standing and looking down. You quickly got up to carry them again..but they look up at you with demon eyes.. They became a demon. Your eyes widened in shocked as they pounced onto you. You grabbed the hatchet from your side and put it over their mouth to prevent them from biting you. Your sibling's nails dug into your shoulder, once you were getting weak, someone came and raised their sword at your sibling. It was Giyu. You quickly rolled away with your sibling, holding them close. Not wanting Giyu to kill them. He got up and looked at you before rushing towards you and taking your sibling. He held their hands behind their back as they growled and hissed, trying to break free. They were hungry and wanted human blood. You kept telling Giyu not to kill them, begging for mercy as he spoke up)

.. they are no longer your sibling. I have never seen a demon turn back into human.

(He said sternly with a poker face, his sword aligning to the nape of your sibling's neck as they growled and hissed)