"No. No. This can't be happening! I'm sorry, Fred! I'm sorry! I didn't want you to die!"
"It doesn't matter you didn't want me to die, Percy. You will burn with me. You killed me just like I killed Death Eaters. so you will burn with me, Percy. What made you think I could ever forgive you? You betrayed us all. If you had never given us up, I never would have paused to take you back. Then I wouldn't have died. I wouldn't be burning right now. But I am not truly suffering. No. I am not suffering because I know you will burn too. You will know the true meaning of suffer, Percy. You will suffer and burn because you killed your brother. What worse crime could you have possibly committed? Even Bellatrix didn't kill Andromeda. But you killed me Percy."
"No. Fred, this isn't you. It isn't. Fred wouldn't be suffering. Fred forgave me. Fred wouldn't want me to suffer."
"Really?" The spirit spoke in such a terrible way. A way Fred Weasley could have never spoken in life. He was more beautiful and terrible then he ever had been. "How do you know that, Percy? Am I alive to tell you? Or am I dead? Who are you to tell me my fate? You are the one that caused it. And so you will burn in Hell with me, Percy. Forever."
With that Percy Weasley woke up from the same nightmare he had every day since Fred died, three years ago. It was time to accept his fate. He had killed his brother and it was time to eternally atone for his crime. He aimed his wand and whispered his final words.
"Avada Kedavra."
I apparently am a very deeply disturbed person. This is not where I intended this to go but here we are. This was written for the Master of Spells Challenge.