AN: It's been a while since I wrote, but I was playing Ocarina of Time again, and I've always wondered how the Poe Sisters became Poes. It's never explained, so I thought that I would shed some light on how they came to be. I might continue this, if I can think of what else to add.
Once upon a time, in the edge of a forest, four sisters lived in a shining mansion. Although they had everything their hearts desired, these sisters were spoiled, selfish, and unkind. But then, one stormy night, an old beggar man came to the castle, and offered them power beyond all measure in return for their mansion. Repulsed by his haggard appearance, the sisters sneered at the gift, and turned the old man away. But he warned them not to be deceived by appearances, for even the most feeble man could be a threat unlike no other. And when they dismissed him again, the old man melted away to reveal a powerful Sorcerer. The sisters begged and pleaded for his power, but it was too late. And as punishment for declining his offer, he transformed them into Poes, and placed a powerful spell on the mansion, and all who lived there.
Ashamed at what they had done, the sisters concealed themselves inside their mansion, protecting themselves from the new owner of their mansion, and their old servants, now transformed into Stalfos. The guardian that lived there was truly a powerful force. If someone came to slay him, and did so successfully, then the spell would be broken. If not, they would be doomed to remain Poes for all time.
As the years passed, they fell into despair, and lost all hope, for who would ever think to come into the lost forest?