If I was Yours

Sora's Decision

Vincent was a proud man, but he knew when to back off and retreat. The girl was far more clever and powerful than he'd first predicted and he could feel his body waning against the strength of her light and the strength of her heart. 

"You win this round, little girl. Mark my words, this isn't over." 

As he disappeared into the dark Sora straightened herself out and let the keyblade fade from her grasp. Her eyes narrow at the vortex and she glanced back at her companions. 

"We move forward. We have to find Riku and warn him!" 

All of them nodded in agreement, and together they stepped through the glowing vortex and followed Vincent into the deepest part of the castle.

~Meanwhile~

It was too late for Riku to be warned... the dark entity that had taken hold of his body kept him silent and sealed off. Though Riku could see and hear everything that was happening, he couldn't speak, move, or interact at all. 

"You lied to me..." He spoke aloud, the dark entity chuckling with his deep sinister voice. "You said the darkness would give me the power I needed to protect Sora... but this power isn't mine." 

"It is yours... but you don't know how to use it yet. I'm her to show you how. Observe..." 

Dark Riku lifted his eyes up so he could see all that came into the opening of the grand coliseum hall. They were surrounded by walls...  no openings, no doors, no windows, the only way in and out was the Vortex of darkness. Vincent came through the darkness panting and silently cursing his weakness.

"Do you need some help?" Dark Riku said with a slight snicker in his voice.

"Shut up! I don't need..." he gave a growl as the rushing footsteps of Sora and her friends cuts him off. 

"Sora!" In the void of darkness, Riku stretched his arms out. "Get out of here! It's a trick, that's not me! Sora!" 

"Riku?" Sora jerked to a stop and held her heart. She heard his voice just now... but it sounded so distant and muffled. Yet there he stood, adorning the dark garb and holding an obsideon black keyblade. "Is that..."

"Yes, a keyblade. Unlike yours, Sora, mine has the power to unlock people's hearts." Dark Riku smirked, loving the look of shock and disbelief on her face. "Allow me to demonstrate." With his eyes glowing with such cruel excitement, he pierced the end of his blade into Vincent's chest. All around gasps echoed, terror and shock trembling in each of their voices. "Now, surrender yourself to the darkness! Become darkness itself!"

"Riku stop!" Sora cried out but her voice of reason was ignored... the cold press of darkness surrounded Dark Riku, and he vanished into it. 

Vincent stared at himself, the power the dark keyblade had unleashed driving him mad with greed and pride. His hands glowed with it... his aura a deep sickly green and yellow, the black of his cape melting to his skin and he laughed. The laugh was full of madness.

"Yes! This is it. This power!" HIs eyes went animalistic, slitting like a cat's as he eyed the group of heroes. "Darkness..." he hissed between his teeth. "TRUE DARKNESS!" His body expanded, the bones and flesh stretching and contorting. HIs laughter turned to fierce roaring, and Sora had to jump out of the way to avoid a massive claw from pinning her down.

"Dragon!" She screamed, backing up and away. Donald and Goofy stood behind her, shocked at what they were seeing. Fire exhumed from the massive beast, it's mouth seemed to smile cruelly as it stared at them hungrily. The tail whipped around and thundered down onto the floor causing a small quake.