Silent killer

Prologue

As Dez walked home from school, he got the itch again. The tingle in the back of his mind that wouldn't go away. The painful scratching, chipping away his sanity second by second. He walked faster hoping to reach his home in time, but he knew it was to late for that. 

     "Dammit!" He started to run, full speed, into the woods away from people in hopes it would stop. It didn't, it only grew stronger, the urge gaining more and more control, flipping his sanity switches off one by one. Eventually he gave in, eyes seeming to be swallowed by blackness, and a purple glow appeared in the center of his eyes. His steps got lighter, his breathing softer, and he walked towards a lone house slowly. He was grinning in a way that should not seem possible, lips twisting into a tight curl, giving him a feline look. He scaled a tree lightly, and jumped onto the balcony with a small 'thump' that was barely noticeable. He clicked open the lock on the window, and crawled in, immediately spotting his prey. It was a girl of about 13, laying on her bed with soft brown hair. He looked at her for a minute, then grinned and leaned over her. He took out his knife and trailed it down her arm, watching her shift uncomfortably. He brought his hand to her mouth and his knife to her stomach, and stabbed her viciously. He dragged his knife upward while he watched the girls eyes widen in terror, and she tried to scream.  He muffled her with his hand, and pulled out her bloodslick organs out one by one, throwing them onto her bed. He finally grabbed her heart, and with one hard jerk, he ripped it out of her chest, watching the blood squirt out of it, feeling the beats start to slow, watching the quivering mass of muscle reduced to nothing but meat. He watched as her eyes dulled, all life leaving her eyes, and removed his hand from her mouth, watching her full lips part as her jaw went slack. He giggled and took a bite out of her heart, loving the warm metallic taste that filled his mouth, and dripped stickily down his chin. He chewed slowly, savoring the chewy flesh and lovely flavor, and once he was finished, he licked his fingers clean. He pulled out a paint brush and on the wall he wrote 'why doesn't it stop beating' on the wall with the deep red, sticky substance called blood. The treasure of the body in a locked cage, needing to be spent all at once. He signed at the bottom with the letters SK,  and wrote down a number. #4. 4 out of the 15 people were now dead, and he was just getting started. He grinned and left through the window, jumping off the balcony and landing without a sound. He stalked off into the woods silently, not knowing that he was being watched.