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 stared at the suddenly tall, athletic, and handsome guy 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 that should have been 16 proper.
The two said nothing, but Dustin was trembling in fear. "As you may have guessed, I can do pretty much whatever I want now." Ty grinned. "I don't know if I have a limit, but let's try a test..."
Dustin gaped as Ty shut his eyes and concentrated, then opened them again.
"There." Ty smirked. "Let's see if it works."
"If... what... works?" Dustin said meekly. His question was answered seconds later as his body jolted with an incredible burning energy. Dustin cried out, clenched his fists, and collapsed ass first onto the floor, squirming. "W-What's... happening to me?!" Dustin groaned, his eyes closing tightly in shock. The energy grew to a burning yawning sensation, and the smaller boy gasped.
Ty stood and watched in amazement. "Yes..." He breathed heavily in excitement. "Yes! It's working! I can do it!"
Dustin gritted his teeth and held on, immobilized by the sensations. His body suddenly felt lighter, strange. He opened his eyes and was shocked to see he was shrinking, but it was more than merely regressing in age. He was transforming! As the shrinking continued, Dustin saw his legs getting longer, skinnier, his toes growing longer and clawed. He was getting bird feet!
By now Ty was wide eyed himself, watching the process with delight. Dustin was becoming an animal! He leaned in for a closer look as Dustin got tinier and tinier, with long yellow legs ending in clawed bird feet.
"Ty!" Dustin screamed. "No, please! Make this stop! I don't want to be a freak!" Still unclear on what exactly was happening, the helpless shrinking teen watched in horror as his mouth began to grow, lips turning into a solid yellow beak. There was a sudden poof and green feathers erupted from under his shirt sleeves, overtaking his slendering arms.
Ty watched in more than astonishment, now, kneeling over the changing Dustin.
"Ty!" Dustin screamed, his eyes widening more as his beak grew longer, thicker, more like a duck. He shrank and shrank, body losing mass but gaining fluffy feathers. His clothes were now blankets. Soon his hands had warped and wings had completely overtaken his arms. It soon stopped, but not before Dustin's head and body were enveloped in green mallard feathers.
Dustin blinked, looked across his beak. He held up his wing/arms to his face and flexed feather fingers. He blinked again, and stared up at Ty, who seemed impossibly ridiculously large. "Ty..." Dustin spoke, his voice higher pitched and now somewhat nasally. "I-I'm a duck." He stared down at his feet and noted the big orange webbed flippers.
"An anthro duck." Ty corrected, reaching down to remove Dustin's clothes from around him. "A little two foot tall anthro duck, to be exact. Now let's see how you look."
Indeed, as Dustin got a better look at his body he was somewhere between human and... duck. It had been a weird day to begin with, now it was just surreal. The worst part was it was actually kind of cool... and... and...
Ty picked up Dustin's far too large underwear and grinned with a blush. "It looks like you like it." Ty pointed, giggling at the little pink shaft that was sticking out between Dustin's crotch feathers.
"Uh..." Dustin stared down in alarm, then back at Ty in horror. "Uh... it... it's now what it looks like! It just felt good, is all."
"Uh huh, I bet." Ty looked down in mirth as Dustin's wings suddenly swept over his crotch to hide his shame. Looking down on the little creature all embarassed like that, it was hard to believe this had been his domineering bully step brother. He was so cute as a little duck person! It was so weird, but Ty had wanted to make sure he could do whatever he wanted.
More testing was in order, perhaps...