Seven Deadly Sins
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Sloth
I had waited too long. Too long to contact my ancestor. Too long to plan the attack. Too long to kill my best friend. Too long to kill my clan.
Lust
I wanted her. So I took her by force. While she was sleeping, I covered her mouth and forced myself upon my lover. And as I came, I crushed her windpipe and watched her writhe in both pain and pleasure. As she died from lack of oxygen, I forced myself upon her once more.
Gluttony
I was hungry. So after I killed my uncle and aunt, I took some bread from their store. They wouldn't miss it anyways.
Wrath
I was angry. Angry that my parents are raising another me in the form of my younger brother. I took out my anger on the clan. They didn't survive. None of them did, except my brother.
Pride
I was proud. Proud of my power, proud that even my exalted ancestor was afraid of me. I was proud that I could hold blackmail over the very foundation of Konoha. But most of all, I was proud to be the best. The most powerful in the shinobi world.
Greed
I was greedy. Greedy for the medication that would prolong my life, so that I could grasp at more and more power. I wanted to live forever. I wanted the world, but it was denied to me by my sickness. So I had to grab at whatever I could take hold of. Everything belonged to me. Nothing escaped my reach.
Envy
I am envious. Envious that my brother is going to live, even as I die here. But I must surpass my limits, to give him this one last gift. This is a choice I made when I rose out of my sloth, gave into my lust and gluttony, expended my wrath, watched my pride fall, and given into greed. This choice had been years in the making. I will imprint these sins onto my brother, so that he will not repeat them. The sins that I have made, the sins that I have chosen to make, they will not be repeated. He is my second chance. And he will bring me out of the darkness.