Jeff pointed the device at Dean, scanning him into the system so his stats cam up on the display. "Okay, how about making you an adult? See what you'll look like when you're older? But, uh, how old should we make you?"
"25." Dean said it without any hesitation. "I mean, I don't want to be old, but it's old enough to drink without being scrutinized, right?"
"Drink? You're not planning to do anything, you know, wrong while you're older, right?"
"Right." Dean waved impatiently at Jeff. In fact that was his plan, after he was older he was sure his friend wouldn't be able to resist, then they could sneak out and hit one of the bars downtown.
Jeff set the age parameter to 25 and stopped before hitting the start button. "You might want to, you know, strip. This might damage your clothing if you grow while wearing it." Dean eyed his friend skeptically, but couldn't argue, so he removed his clothes and stood nude in the middle of Jeff's bedroom. Dean's body was just as average as the rest of him. No real muscle development, other than what you might expect from a fifteen year old who's not very athletic, and his only body hair was a patch around his rather average penis, which he was hiding behind his hands.
"Hurry up, I'm getting cold." Dean's skin was prickling with goosebumps, as much from a draft as from excitement. Jeff nodded and finally hit the start button.
The changes in Dean started almost instantaneously. It seemed Dean would soon be hitting a growth spurt as it was, because right away he seemed to shoot up several inches, from 5'6" to 6'1" giving him a stretched out bean pole look, but soon the rest of him was catching up, his shoulders and hips widening to match his new height. That wasn't the only thing about him that got bigger during the growth spurt, he was now rather unsuccessfully, despite bigger hands, failing to hide his cock. Dean wasn't average it seemed, just something of a late bloomer.
The faint shadow on his chin and lip began to darken, growing along his jaw to meet with his thickening side burns. The few dark hairs on his arms and legs spread outwards, covering his forearms and shins in hair. It even grew past his knees and up onto his thighs. His pubic bush thickened as well as growing upwards forming a treasure trail that creeped along his stomach.
His face started to become more mature and adult looking. Everything becoming bolder and more angular, almost ruggedly good looking, where on his younger face his bolder features just looked awkward. He filled out with some muscle as more testosterone flooded his still growing body. And while he still didn't look like a muscle bound jock, he developed a good layer of muscles, with slightly defined pecs, and a flat four pack on his stomach.
More hair was growing in on his chest, around his nipples and in between his pecs. It stretched out until it connected with that around his nipples in a light dusting across his chest. Soon his treasure trail met with his chest hair, forming an unbroken like to his crotch. His stubble grew thicker, going from late teenage scruff to a full beard, that actually seemed to trim itself into a neat goatee, even his hair style changed, from his boyish ear long cut to something shorter and spiked. The hair on his stomach thickened, going from a line to a strip to a patch of hair that covered his entire abs. His chest hair also spread out, and up towards his collar bone, covering his entire chest. The light dusting of body hair then thickened into a curly fur that mostly hid the skin beneath.
The growth slowed, only little changes visible once he passed what looked to be 22, a little thickening of body hair, a loss of a bit of body fat. Soon a twenty-five year old Dean now stood completely naked in the middle of Jeff's room. He lifted his hands to explore his older body, seemingly uncaring that his 6 inches of soft cock was hanging loose for Jeff to see. "Damn, this feels awesome." He flexed one of his arms, and while it wasn't really that impressive, it was better than what he had before. "You should give it a try, man."
Jeff was still staring mesmerized at his friend, unable to look away. "I dunno." Jeff looked down at the device in his hands, thinking about what he should do.