This is thanks to good ol' tumblr, which gave me the idea. It's only short, but ... :)
Disclaimer: I don't own anything from Glee or Fantastic Four. Just borrowing it.
"Kurt, stop!"
Blaine ran across the rooftop, seemingly short of breath from running up the stairs. Kurt vaguely noticed that he was only wearing his pyjamas, despite the freezing wind that blew through the city. Obviously, the man had been in too much of a rush to even grab a coat. He reached Kurt in a few seconds, his breathing becoming shorter and more ragged.
"Don't do it, Kurt... You could die." Blaine gasped, looking up at Kurt with pleading eyes. Kurt ignored him, looking straight forward again, over the ledge of the skyscraper. The sounds of the night travelled with the wind, rushing up to meet him as he leant just that little bit further forward. Blaine spoke again.
"Please, Kurt. Just wait... we - we'll do more tests tomor-"
"No." Kurt cut him off, turning around once more. This time he stepped off the ledge, and Blaine let out an audible sigh of relief. Kurt took two strong steps toward Blaine and pushed at his chest, causing him to stumble. Kurt didn't give him a chance to react.
"No more tests. No more waiting. No more sitting around, waiting for the answers. I'm sick of being caged like a lab rat." Kurt's voice began to rise in volume as he continued. "Everyone already knows about us. The whole damn world does! So why the hell are we still hiding away in your stupid laboratory?" Kurt jabbed Blaine's shoulder, hard. "And you're the leader Blaine! What do you have to show for it? All these tests have gotten us absolutely no where. We won't know anything until we try these things out in the real world. So that's what I'm doing. Try and stop me."
With that, Kurt turned back around and took 3 long strides over to the ledge. He stood tall, breathing in the cool air. Closing his eyes, he concentrated on the heat. His mind searched for the fire that always burned in his body, hidden. Within seconds, Kurt's hand was aflame. The bright, hot tendrils of heat snaked over the arm of his super suit, racing for his chest. They soon covered his body, the thin flames dancing dangerously over his skin, in his hair, and through every fibre of his being. Kurt breathed in with a smile. With a last look back at a terrified-looking Blaine, Kurt jumped.
For a few moments, Kurt was in euphoria. The air rushed past him with a whistle, but the flames still clung to his skin, giving him a feeling stranger than he could ever have imagined. It was only for a few moments. Kurt soon realised that he was falling very fast toward the cold hard ground, and if he didn't do something about it in the next few seconds, he would become road kill. Panic caused Kurt's mind to seize up momentarily, but he shook it off, trying hard to concentrate. He put on more heat – the flames began turning white on his skin. His arms stuck stiffly to his sides, his eyes squeezed shut. Up, he thought repeatedly, up, up, up, up, UP!
Kurt opened his eyes to find the midnight traffic mere metres below him. He wasn't going to die. He wasn't going to die. A blast of heat resonated through his body, and just before Kurt made contact with the concrete, he shot back up – as if someone had thrown him from a slingshot. Kurt screamed in exultation, yelling out as he spun and weaved through the air. Heart beating at a thousand miles an hour, and adrenaline pouring through his veins, Kurt was elated. He was flying.
He finally decided to go back to the building, and changed direction, soaring over the river of taxis and up toward the sky. His feet found the hard concrete of the rooftop, and he stumbled on the landing, dizzy. Blaine sat in front of him, mouth open, staring. Kurt just smirked, swaggering over to the door that lead inside. When he passed Blaine, he leant down and spoke softly.
"Told you so."