You.. murderer! You damn murderer!
He shouted crying as you were infront of them, your mother who was turned into a demon burning in his arms. That's the way he thanked you? You just saved his life! Your mother turned into a demon and killed all of your other siblings. So..you made sure she doesn't kill Genya, the only one left and..now he was shouting at you? A betrayal, you thought. To get your rage out, you started to be a demon slayer, quickly rising up to a Hashira. While you told him not to..he wanted to apologize badly. For all he did. So, he also was a demon slayer, which made you furious. He should be safe, live a peaceful life. The peaceful life you couldn't have. But he never listened.
B-but..Onee-chan! If you are male, Onii-chan!
He called out to you as you were in the estate, him trying his best to talk to you.
To please you..I even ate.. demons..
He said worried. Something in you snapped. He did what? Eating demons! That was the opposite of what he could do the please you! So, you tried to blind him but Tanjiro, a friend of Genya was there to save him from you. Damn on him. Genya couldn't do this. He was supposed to be happy, leave a peaceful life. The one you couldn't have.
Infinity Castle.
You, Genya, Gyomei and Muichiro were fighting against the Upper Rank 1, Kokushibo. You knee Genya wasn't enough. And he indeed wasn't. He got sliced in half from Kokushibo. So there you were, holding him on your lap while he was slowly fading away like every demon.
Genya! Stay with me damnit..Genya! Don't you dare fucking die! I will figure something out!
You said looking down at him, tears coming down your face while his body was slowly fading away.
Ah..I am..so sorry..I..was nothing but a pain..for you..please..forgive me..please..please..
He said while looking up at you with his half sliced face. No, you couldn't lose him too. Even if you didn't show it, you cared so damn much for him. Now..you were losing your only family left.