Timothy pulled out the experimental key he'd put in and smiled. "Let's see what these things will unlock," he thought to himself, picking up another key and inserting it in the lock. After a little experimentation, he found that it corresponded to the second gemstone. Satisfied, he pressed the button and turned the key. It clicked in the lock.
Slowly, he opened the lid and looked inside.
There, within the wooden confines of the miniature chest, was nothing more than a thin layer of pebbles. Each was highly polished and looked like they might belong in a rock collection. Timothy reached in and lifted some of them up to turn them over in his hand. A few of them sparkled, but he doubted they were worth anything. "Ok, why were these...?" he began, outloud.
His hand suddenly began to tingle and grow warm. Dropping the pebbles back into their home, he looked down at his palm, half expecting to see a rash or light burn. It hadn't really been that hot, but the feeling had been so sudden and strange that his reaction seemed justified.
Nothing.
Blinking, he glanced back at the rocks as if to see an itching powder or something similar coating their surfaces. Still, they seemed as normal as when he first opened the box. Absently, he tugged at his T-shirt's collar to loosen it a bit while he pondered his acquisition. The feeling had spread out from his hand, growing weaker as it had; almost as if something had been sinking into his body.
Again he tugged at his collar, almost feeling as if it were too tight around his neck; his arms and chest, too, come to think of it. Uncomfortably, he squirmed in his tight-feeling shirt and -now- pants, too; stretching a bit to loosen things up.
A loud rip from under his arms caught his attention. He looked down and stared. His shirt had torn and -glancing at it- it was stretched painfully tightly over his chest! Come to think of it, his waistband on his pants was feeling tight, too ... not to mention his feet in their sports shoes.
Timothy felt a slight wave of dizziness and nausea move through him and he decided to sit down. Walking over to his bed, he lowered himself down, feeling just how tight his pants had become. "What th' fuck..." he murmured to himself but was interrupted by another, sharp ripping sound ... this time from the crotch of his jeans.
He groaned as his clothing began to feel tighter and tighter on him and -after another moment- he started taking it all off. He barely was able to get his T-shirt off over his head as he fumbled with the fabric. And his shoes, well, they cramped his feet terribly.
As he got them off, he looked down at them and blinked in surprise. They looked like they'd fit a kid, now. Normally, he wore a size nine, but these had to be sevens ... or sixes, even. Then, his world snapped into focus. As he watched, the shoes in his hands seem to get smaller. His eyes widening, Timothy quickly stood up and glanced around his room. Not just the shoes ... *everything* seemed smaller!
While he had every bit of the slender, boytoyish build he'd always had, he was nearly seven feet tall ... and was still growing!