Before Dustin had much time to react, Ty had barged into his room and now the door was closed and locked behind them.
Dustin simply stood and stared at the suddenly tall, athletic, and handsome teen his step brother had become. He felt even punier and smaller than before, suddenly self conscious of his ill fitting clothes hanging off his 13 year old body. He gulped loudly and began to tremble.
The two said nothing as Dustin shook. Ty smiled smugly and finally leaned closer. "So. This has turned into an interesting birthday, huh?"
"Y-You shrank me." Dustin whimpered, clutching his hands against himself. "You made yourself big and you made me smaller. How did-"
"Shhh." Ty held his finger up. "How about this? I promise I'll grow you back to your old normal self, okay?" Ty knelt down and grinned at Dustin's eye level. "But you have to do something for me."
"Y-Yes?" Dustin's eyes widened eagerly. "Anything. I feel so small and helpless."
"Okay. Good." Ty nodded. "Then I need you help me figure out just what I can do with my new... talent." Ty stood back and looked down on Dustin, considering. "I wonder what I should try first. I know I can make people younger and older. I know I can change things to what I want. So..."
Dustin gulped again. He was about to regret helping.
"Let's see..." Ty began, thinking about the kind of transformation he wanted to effect. Suddenly it came to him and he grinned broadly. "I know! Let's see if I can..."