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Tsukasa's grin is still frozen on his face, even as his amber eyes stare lifelessly into Amane's.
The younger twins face is wet with tears, and the older twin's hands are wet with blood.
Tsukasa's blood, Amane's tears.
"I failed you... Tsukasa..." he hissed, fists clenching so hard his nails bit into his palms.
He felt dissociated from his body, as though some monstrous mental exhaustion had thrown him out of his body and forced him to watch the life of his brother end by his own hands.
The handle of the kitchen knife was slick with sweat in his hand, and its presence alone felt like Amane himself had been stabbed.
He couldn't process this. It wasn't possible. There was no way in hell that Tsukasa, chaotic, socially awkward, excitable, hyper, clingy Tsukasa, was laying on the floor.
No way he was laying in a pool of his own blood, dead.
This was a prank, it had to be. Tsukasa would wake up any minute now, 'Ha! I got you!'
A whole minute passed, and the younger twin didn't twitch. There was no telltale rise and fall of his chest.
Where was that childish laughter that came after a twisted joke like this?
Amane had spent so many of these pranks scared to death about his brother's safety, but now he refused to accept that this was any different.
"Tsukasa...?"
He knew what he had done. He knew it. He knew he couldn't take it back, never.
Yet he couldn't accept what he had become, he didn't want to.
Ignoring the blood, Amane lowered himself so that he could rest his ear against Tsukasa's chest.
He felt a spark of hope when he heard the blood pounding in his own ears, but after a moment or two he finally acknowledged the truth.
No pulse.
Tsukasa...
Tsukasa was dead.
He, Yugi Amane, had killed his twin brother.
"I failed you..." he whispered almost inaudibly.
Before any of this, he and Tsukasa had all the dreams in the world.
They would reach for the stars before going to bed, pointing at constellations they liked and making up stories about them. Tsukasa's had always been a bit twisted, but Amane was somewhat aware his brother was sick.
They planned to be the first to live in space. Amane wanted to live on the moon, while Tsukasa was more fascinated by the stars themselves, especially dying stars and black holes.
Tsukasa always made him promise that they'd go to space together, and never be apart.
Now, Amane couldn't fathom finding joy in astronomy after what he had done.
Shaking, he carefully got to his feet. Standing over his brother's body, he swore;
"I'm not going anywhere."
He smiled, a silent goodbye to his dear brother as tears rolled down his cheeks.