A/N: This was written when I was a kid. Hiei/Kurama was my first yaoi pairing. I'm keeping this here on the basis of nostalgia. It's not a good piece of work. Please enjoy regardless though. I re-edited a few things. Of course, I don't own YYH. OOC-ness and fangirl Japanese ahead! Kokoro means 'heart' in Japanese. :)
Kokoro
Kurama held Hiei close as he sat, pressing the dark-haired demon to his chest and feeling the beat of his heart. His eyes were closed as he struggled with thoughts of loss and a nightmare that could become a reality. He felt his lover's hand grasp the arm of his shirt uneasily. Hiei stared out the open window. His eyes were half-open and he was afraid to speak, for fear of his weakness showing. He had to be strong. Even if inside, his heart quavered.
"What ..." Hiei paused, coughing. His voice shook slightly. "What if you change?"
"Instead of being Suuichi, I'd be Youko. But how could I forget?" he rested a hand in Hiei's thick black hair. "How could I not remember the love we share? I don't want ever to not love you."
Hiei buried his face in Kurama's warm shirt. Muffled, he spoke again. "I hurt you many times. It wouldn't be like I didn't deserve it if you stopped caring for me."
"Hurt me?" Kurama stroked his neck and shoulder. "When was that?"
"I stabbed you when you helped Yusuke. I ignored you and mocked you ... for my own selfish reasons, I pretended not to have these--these feelings. It--"
The kitsune cut him short, pulling up his face to look into his gorgeous ruby-colored eyes. "I won't let anything stop us. Not even death. As demon, I will be with you." It surprised Kurama to hear Hiei so shaken. 'But,' he thought, 'Only my ears get to hear these words.'
The pair had never struggled with the acceptance of others, showing their love only in times of desperation. It had been so long ... so many trials, so many heartaches. Now Kurama faced the aspect of death. It was only his human body, sure ... but what about his heart? His body may change, but would his feelings remain? Would he still want to be with Hiei?
The dark-haired demon shifted around in his arms. Thoughts also raced by in his head. He touched Kurama's silky red hair, thinking only of how much he'd miss it if-- ... when Kurama died. Then he would have shiny silver hair. No more somber green eyes or human games ... or ...
Perhaps hate would become the kitsune's only thought. Revenge ... killing ... no time to waste on his forgotten past. These horrible things almost completely faded at the mere remembrance of simple words. 'As a demon, I will be with you.'
"Hiei?" The dark-haired demon stared at Kurama's smooth hands as he grasped them.
"Yes, Kurama. I know."
"I still have doubts too about myself. But just because I have a tail and yellow eyes won't mean that I don't belong to you." He leaned down to whisper into Hiei's ear. "My body and my heart want only you."
"Stupid kitsune." Hiei smiled, with a typical insult. He turned his head and his lips met Kurama's. For a few moments at least, this fear and worry was replaced by pure love and devotion. It wouldn't matter. Youko or Suuichi. Love will remain. And now, Hiei knew that life was nothing without something to love.