In The Bleak Midwinter

"Humans are your family. Always remember that." He doesn't remember who told him that, nor why the words continue to burn within his soul, flickering with memories of warmth, life, and a child's smile. But he remembers them. For lack of anything else to remember, he remembers those words. And for the first time in centuries, a demon turns away from human blood in disgust. Or, the one where Muzan messes up big time and turns Seto Kaiba into a demon. His memories may be gone, but Seto Kaiba is still Seto Kaiba, and after being given a compulsion to protect humans as fiercely as he did Mokuba, how could he not be the biggest pain in Muzan's backside?