You finish your shower and walk back out to find dustin still naked in a now very different room. He'd been playing with his powers and made the room massive. A huge king-sized bed filled up a corner, weights another. In one corner he had a massive sofa and a huge tv with what looked like every video game console imaginable. On the other side of the room an open archway led into a massive walk in closet. Even though you can't see all of the clothes in there, you can see enough to know it's full of sneakers, workout gear, and other expensive clothing.
"Check out the upgrades," he booms, his voice shaking the mirror by the weights. "I want to go to the mall and put these powers to the test, so let's get dressed. "
You suddenly find yourself teleported to the inside of the closet, without your towel. You turn around and see Dustin naked sitting on a couch looking at you, his massive thighs spread to show off his absolutely massive dick.
"I need to decide what to wear, so you're going to model some outfits for me."
You nod, it would be stupid to do anything other than nod.
Dustin snaps his fingers and clothes appear on you. A pair of compression shorts, a tank top, and a pair of gym shoes. The shirt and shorts would have been super tight on Dustin's massive body, but were incredibly loose on you. And the shoes were so big you'd have tripped taking even one step.
"Oh this won't do!" Dustin yells. "If you're going to model for me, then you need to be the same size as me."
As soon as he finished saying it your entire body tenses. Muscles begin to inflate all over your body. Your feet grow until they're a size 14 and the shoes are a perfect fit. Your legs lengthen and grow, filling out the compression shorts until they're tight around your small dick. Just as the growth in your legs stops, you balls drop and you cock grows in girth and length, leaving you with a mirror image of Dustin's dick, one that bulges out of the compression shorts. Abs and pecs fill in across your chest and torso working up towards you biceps which now fill out the shirt perfectly.
Dustin stands up and walks over to you. "Much better," he says, looking you in the eyes. "But I think I need to be a little taller." Again, as soon as he's finished saying it, you and he both watch each other grow four more inches until you are both 6'4". "Perfect," Dustin says.
"Can we please just go the mall now," you say in a much deeper voice, desperate to get the humiliation you're sure he has planned over.
"Did I give you permission to speak?" His eyes glow bright red, demonstrating his power. "You'll keep your mouth closed unless I allow you to talk. Do you understand?" he asks.
You try to respond but find yourself physically incapable of opening your mouth so you nod instead.
"Good. Now, I can't go out in my workout clothes. Let's try another outfit," he says, snapping his fingers.
New clothes appear on you. A black v-neck t-shirt, showing off a considerable amount of pec cleavage, and a pair of shorts that are quite short, showing off your now massive thighs. The shorts are too tight though, and your dick is obviously bulged up and uncomfortable. A pair of white sneakers appear on your feet.
"I like the shirt," Dusting says examining you, "but the shorts obviously won't do for somebody built like me."
He snaps his fingers and just the shorts change this time into a pair of joggers. He snaps again and they become a pair of sweatpants. He keeps snapping his fingers, trying to find the perfect outfit. You cycle through a few different pairs of shorts, joggers, sweatpants, even just a jockstrap at one point, before settling on a pair of dark jeans. Your ass looks amazing and you can faintly make out the outline of your massive dick snaking its way down a pant leg. Dustin keeps snapping, this time looking for a pair of shoes. You're helpless as he uses you as a doll. You look down to see your feet cycling through different pairs of boots and fashion sneakers. He settles on an incredibly expensive pair of Jordans.
"Perfect," Dustin bellows, standing up you meet you at eye level once more. This time he doesn't snap or say anything. He suddenly just has the exact same outfit as you on. He's clearly becoming more comfortable with his power. He takes a few steps toward the mirror before stopping, "These underwear a bit uncomfortable." Again, both your's and his underwear disappear, leaving you both commando, which just shows off your insane bulges even more.
He examines his face in the mirror. This time just he changes. He cheekbones get higher and his jawline becomes more defined. He looks much older now. A decent amount of scruff fills out a nice beard on his face. He looks like a model now. A bit of chest hair appears on his pecs, clearly visible thanks to the tight v-neck. He turns around and looks at you and you realize he's made his eyes a brilliant shade of bright blue.
"Since you were such a good little model for me, I'll let you stay like this while we're at the mall. In fact, I'll let you be my twin as a reward for now. Behave yourself and we'll see how much I shrink you back."
Your face suddenly itches as a beard grows out of it. You look down at you pecs and see hair growing out of them too. Your face changes shape and your hair becomes styled exactly like Dustins. Your eyes also become gorgeous blue. You are now an exact mirror of your brother Dustin.
Dustin starts walking back towards the room to grab his things to go to the mall. You follow him, walking exactly like him. You feel kind of funny, but are still unable to open your mouth to tell Dustin. You're not sure why, but you feel a bit of power within your chest. Suddenly, you realize that since you're an exact twin of Dustin, you must have the power again. With Dustin facing away from you, you test out your theory. You look down at your chest and concentrate. It takes a second or two, but suddenly your pecs are covered with a thick, curly forest of hair. You quickly regress it back to match Dustin's before he turns around.
"I could just teleport us to the mall, but I thought it would be fun to drive my new Ferrari," Dustin says. Suddenly you're in the passenger seat of a brand new red Ferrari. Dustin is in the driver's seat backing out of your driveway and heading towards the mall. He obviously has no idea that you have the power once again. You make a quick wish that no matter what, your power is tied to your consciousness. You would be unable to ever lose your power again. You could take his power away from him or you could continue to play along. What will you do?