((This came out much longer than intended. -.-' Shion should probably look over it, in case something is wrong, since I go to quite a bit of detail and make a lot of assumptions.))
Xu Bai was used to getting a lot of attention. A well-dressed man of his looks was bound attract attention, no matter where he went. That's why it always amazed him how no one noticed when he simply vanished into thin air. Or turned invisible. Or switched dimension. Whatever.
It had been a sunny afternoon, a really nice day for a walk. A good day to die, too, Bai hoped, for the sake of whoever was dying right now in the third floor of the building before him. A moment ago he'd been walking in the street like any other man going about his business, but then he'd felt it. Death. It called to him, an irresistible promise of a soul to harvest - and an even more irresistible duty to do it. While walking, his form became ethereal and he shifted partially to another dimension, disappearing from the sight of other people. No one seemed to notice, not even those who'd had their eyes on him. That's how it always worked, it was as if his exitence was removed from reality every time he changed, and no one remembered he'd even been there.
Then came the pain. You never get used to feeling your own body high-speed rot all the way to a skeleton, no matter how many times it happens. Of course, after a while you no longer feel anything, your nerves are dead, but the beginning is... indescribable. Then came the equipment. Bai had long since stopped wondering about his clothes blurring and changing into ragged black robes, and a huge scythe materialising out of nowhere when he outreached his hand and gave the weapon a brief thought.
It was done, then. Xu Bai had changed into the very image of death, so terrifying that had the transformation not taken most of his feelings away, a glance in a mirror might make him tremble in terror. His existence had shifted partially to another dimension, a much darker one, where the sun seemed as weak as a lightbulb. He could still see everything that happened in the real world, although everything seemed... different. Slightly blurred maybe. Or maybe it was just the darkness. He wasn't sure if it was all in his eyes, which were now just a couple of ghostly lights burning in the darkness of his empty eyesockets, or if the distortion and abnormal darkness were caused by his existence between two dimensions.
Matter was now somewhat... subjective to him. He walked on the ground like everyone else, yet he had no need for doors. He walked through walls like they didn't exist. Maybe they didn't, not in the other dimension. Yet the stairs, oddly enough, did exist. Common sense was useless in this dark realm, its natural laws were different - yet logic and reason were all Bai had left, since his emotions had been taken from him.
He entered the room where the "stench" - if it could be called that - of death was strongest. He walked right through the wooden door, to find an old man lying on his bed. His soul - an ethereal, almost transparent twin of the physical body - was floating over the unmoving body. It was almost completely separated, there was only a thin silver cord tying them together. The old man had died peacefully in his sleep, his heart stopped, and the silver cord would snap any time now.
Normal humans couldn't see him, but a separated soul could. It noticed him, its eyes widend and its mouth opened to scream. It was right to be afraid - after all, a reaper has come to take it away. Before the soul could make a sound, the reaper's scythe swung, severing the silver cord. For a moment, there was a shocked expression, then the soul lost its form and became a floating ball of light.
It was pure and strong, full of energy. Bai suppressed his hunger and reached his skeletal hand towards the soul. An hourglass materialised on his palm, golden and ornate, with blood-red sand inside. The soul let out an inhuman screech as it got sucked into the hourglass. One more poor soul to be taken to the devil. It was the third one: the next one would be Bai's.
Xu Bai turned to leave the room. There were two reasons to leave quickly: one, pure souls like this attracted others besides reapers. Bai had no desire to meet an angel after taking a soul from right under its nose. Two, now that the presence of death was weakening, he'd soon change back to human, and it was always a good idea to get away from the dead body before that. The guilt could hit really hard otherwise, and there was always a chance of witnesses.
The process of returning to life was pretty much the same as the process of changing to a reaper, only in the opposite direction. His scythe and hourglass vanished, his clothes returned in place of the robes, and flesh was born out of nothing, knit over his bones and finally kickstarting his vital functions back to operation.
Bai gasped for air. It felt wonderful. As did the heart pumping in his chest. Feeling anything at all felt wonderful. Even the pebble in his shoe. Then he opened his eyes, expecting them to be assaulted by strong sunlight, forced to squint.
"...Oh. Damn." He wasn't back to the human world. He was in the city of his employer, the devil. "What do you want now?" he asked aloud, unsure if he'd be heard. Usually he was dragged here when the devil wanted him to turn over his collected souls, but this time it'd only been a few weeks since the last time, he hadn't had time to gather many souls yet. The devil was usually more patient than this.
Sighing he started walking in a random direction. It didn't matter where he went, the devil would find him when it wanted to.