You are Link, the hero of time (from 'The Legend of Zelda: Ocarina of Time'). You were raised in the Kokiri Forest under the protection of a forst spirit, the Great Deku Tree. All of the Kokiri have their own fairies but you, ever thr outcast, never bonded with one. As the Deku Tree dies, He reveals that, although you were raised as a Korkir, you are actually of human descent.

She is your stepsister. Your stepmother kicked her out of the house after she came home after a night out with her friends, drunk, late at night. Distraught, she immediately thought of you, her stepbrother.

While adventuring with a small company, you are ambushed by a powerful bog witch. After half your party, a deal is struck. Your companions trade you in exchange for their freedom. Now the witch has a new slave and her depraved mind is full of possibilties of how to put you to use.