AU. This is just the prologue, normal chapters will be quite longer.
Prologue
"How many times have you done it?" It was more of a statement than a question. The deep, matured voice resounded through the room of an undeterminable size. The only source of any light was the small light bulb hanging on the ceiling for dear life as it swung like a demented metronome. Even the dimness was enough to nearly blind the young boy seated in the chair, arms cuffed before him. He didn't dare move or make a sound to defy the demon. Everyone in these parts knew what happened if you defied an aged monarch.
"Gone back," The boy lightly cursed under his breath. He would converse with the demon, if only he could. His vocal chords were near complete destruction as well as the rest of his body. He could swear that the demon wasn't talking if his bloodied ears were even slightly more tattered.
"Tried to save them?" The footsteps grew louder as the man came closer. His shined dress-shoes shamelessly disturbed the eerie silence that filled the dark room. The boy knew this memorable scene all too well, and it always ended the same, as he controlled it. He could end it any time he chose with just the small, insignificant sound of glass breaking. But he remained cuffed on the chair once again, his own reasons nameless. Maybe the warm feeling of nostalgia, or just his own memories collapsing on themselves, he did not know.
"How do you do it?" The demon dared stepping closer once more. His breath flooded through all the blood, sweat, and grime to trace the boy's neck, sending a shiver down his spine. The irritating sound of electricity formed oh-so-quite-soon after he asked the simple question, just like every damned time before. The demon stepped cautiously around the chair and kneeled to face the boy.
"Enlighten me." The sound of electricity grew louder as he watched it spark around the demon's hands. He knew what was coming, and it didn't even really hurt anymore. It was more of a bothering sensation that one had experienced hundreds of times. Because in reality, he had. Or maybe it wasn't reality. Who was keeping track, anyway?
The demon would never receive his response, he never did. The boy turned his palm upward and revealed a small glass ball. It was just greater than a marble. In the blink of an eye, the boy crushed it in his fingers, the glass burying itself into his calloused skin. It was over. No. It was over again.
Adventure Time: Our Darkest Hours