Heidi seemed to have nothing to say about pranking Shawn, but both Chrys and Jacob both seemed to offer ideas. Peter, sitting down quietly next to Heidi, looked over to the girl questioningly. "Is this how he always is?" His russian accent was thick and rough, his words sounding like  he had just been studying up on the english language. 

He was a little bigger than a normal thirteen year old would be, but he already seemed to be growing into his body well. His hair was buzzed, cut as short as can be while he wore only a simple yellow t-shirt with a red hem, and blue jeans. He wasn't exactly shy, but he was rather soft spoken. There was nothing that he, personally, could offer to the situation. Not that he was enabling the pranking, but becoming a large, metal man would not be all that helpful in tricking the older boy. "We could... Pretend that he slept into the future. Everyone abandon the theater and leave him here with myself."

"Oh?" Kurt tilted his head. "And how vud zis trick him? You may be new, but you hardly look enough to insinuate such a thought."

Peter stood from his seat and took a breath. He had to remember to breathe, to feel, to flex muscles that only existed to him. It was so tricky, activating his mutation on his own without something triggering it to happen. Slowly, his body began to bulk up and grow, his skin growing a ghostly white, then sparkling silver, then finally turning to some metal. Everything he was became metal, his hair, his eyes, it was all like he was the liquid metal terminator. His loose clothing now fit him properly, Kurt even looking at him evenly from his position on the stage. 

"I no longer look as human as I did. I could be ah robotic creature. He would be unaware of the situation." Peter explained himself, looking amongst the students shyly. He was unsure how the others would react to him transforming as he did, even if they were all mutants together. Perhaps they could combine all of the plans together for something great? He was unsure.