Ahah, told ya'll I would upload the nice ending! Here it comes:
…But just as her claws touched the vein, an explosion of light emerged from Sora's heart, sending her flying into the nearby wall.
The streets filled with light, and in the middle of all of it, Sora's body was flaoting in the air, with the single vein connecting it to the heart.
The light became even stronger, and in a glimps with the same shine as the sun times… uh… many, his heart was reunited with his body.
The wounds and his broken back healed, and just as the light was fading, Sora's spirit, restored by the power of the light, returned to him.
He opened his eyes, just to see another attack from the dragon.
'You just don't know when to quit!' he shouted, and when she launced her attack, Sora grabbed her hand with almost over human strengh.
The dragon looked frustrated, and tried to escape his grasp, but it seamed like the light had given him more power.
He lowered her hands, and in a kascade of light, she disapperaed, and the only thing left, was a midnight-black heart shaped diamond.
The end.