Credit for Co-author goes to firecrackerxx. Thanks, FC?

He had hair as dark as night, skin as pale as snow, he has teeth that he must tame to resist the urge to skin the flesh of a human from their remains. His eyes were like pools of blood, glowing with hate. His mind has been ruined, maybe forever...
His name was Dante, and he was hungry for revenge... Revenge on his twin brother, Zane, who stole everything from him. His father, his only friend... Even his life. His icy blood had only chilled thanks to Zane's cruel actions. His brother had taken away his innocence, and now Dante was was going to take something away from Zane in turn.
Dante and Zane quietly tossed a ball between each other. Zane was always the favorite child. Zane was never bad. Zane was a perfect cook. Zane this, Zane that... Never did Dr. Julien praise Dante for his appropriate behavior. For that matter, Dante didn't get his praise for anything, unless Zane himself praised young Dante. Not too long later, Zane and Dante caught fireflies in the summer.
"Zane, look how many we've caught!" Exclains the ivory skinned boy. Zane and Dante had caught a ton of fireflies.
Zane cheers "There are so many in your jar! We could hang them over our beds. What do you think, Dante?"
Dante frowns. Zane's praise did not inspire him the way he thought the cheerful approval of his brother would have. Why didn't it give him that same thrill that he got from his father? Dante smiles, and says, "Sounds cool. We should give it a try!" Z
Zane and Dante skipped back to their father, both pleased and flushed by their efforts, and Zane skitters to a halt.
"Well done!" Dr. Julien's praise was obviously directed at Zane, excluding Dante. The dark haired boy felt his body temperature rise, his anger was burning his whole body. Dante's face slowly becomes bright red. His eyes became an even darker shade, almost the shade of an animal's blood, and he snarls, drawing his lips back. His fingers curl around the jar, almost shattering it. The cracks in the glass proved this daemonic strength was breaking it.
Dante stares at his father. He lifts the jar, and throws it at a tree. Zane turns around, and gasps. The paler boy was trembling, and grabs Zane's shirt. "You," Dante had snarled with fury at his blonde copy, "You are a pest! Why are YOU his favorite son? What make YOU special?! WHY ARE YOU SUCH A GOODY TWO SHOES?!" Dante feels his hands lifting in a shaky manner. He clutches Zane's neck, and tries with difficulty not to squeeze it, for a part of him wants Zane to die, but another thinks letting him live on forever is more torturous.
Zane shook with terror, not sure what to do. How could he harm somebody who had been his best friend for such a long period of time? Zane finally whispers: "Dante? Why are you doing this?" The hold on his neck was slowly tightening, but it's an involuntarily action. The platinum blonde gasps at the next sight.
Dante was fantasizing with a dark hunger. He felt Zane breathe with difficulty, and slowly fading. When Dr. Julien took a step forward to try to separate the boys, the dark, devilish boy made a silent threat. Then verbally.
"Come closer, father," He hisses, "I dare you to. Then I will crush your little pet project of a son..."
The Dante that Zane had loved was gone. It was dead and corrupted by a deep seated jealousy. Zane asks again, in a strangled voice, "Why, Dante?"
The corrupt brother stares at him, yelling: "Why? Why?! WHY?! YOU WANT TO KNOW WHY?! BECAUSE YOU ARE FATHER'S FAVORITE! BECAUSE YOU TOOK AWAY MY ONLY FAMILY MEMBER! BECAUSE I! HATE! YOU!"
He throws Zane at a wall, and sprints away, feeling his uncontrolled anger taking over him. In the back of the mind, he heard many whispers. Female and male. Young and old. Fluid and raspy. "You are stupid, Dante..." hissed one voice. Another laughed "Everyone hates you...!" Three girls each laughed. He howls "SHUT UP! SHUT UP, YOU IDIOTS!" Then a quiet female voice, beautiful and ancient like the earth, points out "You almost killed your family. You enjoyed it. Why don't you kill some more?"Dante says "...I like that idea..."