(Seeing as nobody has responded to the music box as of yet. I will do a bit of NPC control.)

Out from the halls came a teenage girl. Another experiment. The experiment who escaped. For this girl, she were about to partake of a fate harsher than any of which the guards could give. The magical tune of the music box seemed to twist and turn her cat-like ears. She knew this same tune from somewhere before. Only she didn't know that the demon which lurked deep within the clutches of her mind knew that this particular tune was a part from her past. As she drew closer to the magic box and knelt down beside it, the boy witnessed the goings on in the darkness of the halls. As night was when the demon was at it's strongest potential; not only to stay hidden within the shadows but to also because bright naked lights burn the demon at the full transformation and weaken the demon's power in it's host's body. 

The girl touched the magic box but her fingers went straight through it. She leapt up with shock, was this real? A figment of her imagination? Is she going mad? When out from the shadows came the boy, holding the teddy bear. Fright replenished her eyes as she looked upon the boy. The boy just standing there, looking directly at her in such a bizarre and plain manner. 

"What are you doing up so late?" The boy questioned, the magic box still playing in the background. 

She points a shaky finger at him. A single tear running down her cheek as her face felt frozen.

"You! Ple..Please! don't hurt me! I'll go back to my cell! I promise!" The girl screamed in terror.

She knelt down holding her legs with her face pressed against her lap. This girl had known him from experiments placed on her before. The way the boy seemed to look at you like he was reading your thoughts. Then something bad happened, but it was all under the control of the scientist and Black Angel. Now the tide has changed. 

"I think, we both know. It is too late." The boy replied in a deep manly voice. 

The girl let out a final hurtful scream before blood sprayed everywhere. There wasn't a single spot without blood on it for a good radius. Her hands went flaccid as her eyes remained opened widely. As if she died in fright and through her death she will always remember the same level of fear. The magic box tune has run flat and slowly faded away. The boy was nowhere to be seen at the place of death, only the blood plastered on the walls and the blood soaked body of the girl who walked into his trap.