"Collin relax. It's not a real heart."
Not a real heart... The words buzzed in his head. It was just a robot. No sweat, right? But it looks so real... Collin was never a normally squeamish person to begin with. He watched gory movies, he had played violent video games... But actually doing the killing, it was nothing like he experienced. He felt numb. His vision blurred and he felt lightheaded. The only sense he had intact was his touch of the heart.
He heard his friends saying various things, and they all sounded like words of appraisal. However, Collin's mind had muffled the shouts due to the shock. It was ironic, how he had been complaining about not having a cool power to himself the entire time and now, when he did something "cool," he tensed up and froze.
As this thought ran through this head, his vision came to and looked at the heart, which had changed. The shock must have distracted him from it, but when he snatched the heart from the robot body, it began to deteriorate. It was at a slow pace and the changes were only small at first, but now with some time, significant changed had happened. The heart's mechanical origin was clear now, as it had rust around the edges and parts of the metal were crumbling off. The lump in Collin's throat was finally cleared, and he could finally say what he had wanted to all this time.
"What the fu-" Unfortunately Collin was cut off again and his eyes went wide, as a purple gas exuded from his mouth and slowly filled up his immediate airspace. Collin's eye went wide, and he went back to his natural reaction of complete horror.