Kaneki felt his insides churn as Rezi drove her tentacles through his body. Again and again and again and again and again. He gasped as blood spilled out of him in tidal waves, the pain flaring all around his body with the force of a tsunami. The tentacles dislodged themselves from his body and he fell to the ground with a dull thud.
His breaths became labored and his eyesight blurred into tunnel vision, the edges curling in on themselves to place the object of his pain at the centre of his peripheral. Rize. She stood there, the whites of her eyes as black as an abyss and the pupil so red one might mistake it as blood. She grinned at him and he wished he was already dead.
"You're still not dead? Good." She cooed, the sound sickened Kaneki's stomach. He tried to backpedal away but the jagged hole in his stomach refused to let up and he lost all motor control to his lower body. He tried to breath again, but found that it was getting more and more difficult.
"Kaneki-kun!" Rize surged forward, looking down at him much like how a victorious predator would look at it's food. He choked back a sob as another tentacle pierced his right shoulder, ripping bone and flesh apart before it twisted like a drill.
Kaneki lost the strength to even scream, holding his breath as he wished to live. He didn't want to die, he didn't want to his last breaths be spent squirming away like an insect. Something inside him crumpled, as though it couldn't handle living anymore, before it died.
Then Rize sent one last final tentacle into his heart and now the reaper finally embraced Kaneki Ken's thread of life. His eyeballs rolled to the back of his head, his soul was about to leave the world, the scissors poised to cut his lifeline.
Then, his heart beeped again. Something inside of him, something stronger than the other piece that died, woke up. It breathed, it hunted and it consumed every part of him that was weak. In Kaneki's last breath before his eyes closed, he awoke again to the agonizing pain of rebirth.
"Oh my! You're still alive!" Rize gasped in joy but Kaneki didn't hear her. His mind was left a mess at his own screams of pain. His voice distorting within as everything he was breathed again, but it was not air that surged into his body, it was the voices of the Many. They spoke to him, they comforted him, they pained him and terrorised him. They were all dead, colder than even a hundred year old corpse. They were insane, they were broken. His body broke, his mind drowned in the sea of voices before finally, he spoke.
'Let the Hive, set you free' Then the voices ended. And the last thing Kaneki heard was the sound of metal tumbling done, a soft wheeze that he could not discern and voices spearing through the haze of post death.
'Can you do it Doctor?' A gruff male voice said, Kaneki was only barely able to realise he was speaking english.
'Perhaps, his heart was partially destroyed and I can only hope that the regeneration will be able to kick in before he dies.' Something inside Kaneki stirred and he felt the sensation of two arms wrap around his chest, one human with five fingers the other something else with four pieces of jagged metal encasing him.
'Just do as you need to Dr, Blackwatch is paying for it.' Kaneki felt his body shift and change, the human hand suddenly wrapped around his neck while the other encircled his abdomen and pressed himself close to the person behind him.
Then he felt something going inside his body, organs exchanged, blood replaced, all the while the jagged metal drew circles in his chest.
'Decide Kaneki,' A voice said, the same one that had silenced the others, 'Between two lives which path will you take. Neither is forgiving, neither is human. Your choice, however, will make it all the more simpler.'
Then the world blanked out into darkness, his mind swimming in thoughts not his own. He opened his eyes, saw the inky blackness of his mind and watched dazed as a form manifested in front of him.
It was rippled in shadows, its body writhing in flames before it died and receded to reveal his face. It was normal, neither different or new, but in a blink it changed.
His eye turned black, a red pupil so crimson and dyed in his own blood that it pierced through the darkness. Then the other side, the one with his normal eye, distorted into being. Tendrils shifted and cut through the skin, rippling his face and twisting it. Before long that side of his face was replaced with a mesh of flesh and metal, his one normal eye now shining in golden light glinting as a predators tool.
Kaneki breathed, found that the air tasted like nothing, and closed his eyes for another slumber. Another slumber deep in himself, another slumber that would bring about a new body, new mind, and in it the Kaneki Ken that was human suddenly disappeared.
ANNOUNCEMENT
So I added this little bit in so I wasn't all evil and left it off there. But I'm still debating on whether or not to turn this into a full fic. I might just leave this as simply a two-shot, with a few other One-shots of Kaneki as a Ghoul/Evolve and Blackwatch working with the CCG in eliminating Aogiri tree or other Ghouls. The story idea tho is up for adoption or if anyone wants, to take inspiration from. I have no qualms about it.