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 fourth gemstone. Satisfied, he pressed the button and turned the key. It clicked in the lock.
Slowly, he opened the lid and looked inside.
Within the box were two, inset shelves made of some polished ceramic stone. Each had a small divot in it, about the shape and size of a thumb print. Timothy blinked. He could have sworn that earlier he'd heard something sliding around inside, but there didn't seem to be anything here. Maybe it had a hidden bottom?
With a smile, the young man placed his thumbs in the divots and pushed. A tingle rushed through his body, startling him and forcing Timothy to drop the chest. It clattered to the tabletop as Tim looked at his thumbs. "What th' heck was that...?" he muttered, turning his hands over and over.
As he examined himself, though, he stared. His fingers ... they were looking ... different. Broader. Softer. Blinking, he looked down at himself as he strange tingle seemed to focus on his chest and body. With eyes wide, he looked as his slim, toned chest began to grow bigger muscles ... but his belly began getting fatter!
He stepped further away from the box, staring at his body as it changed. He gasped as he felt pounds slide onto him, his shirt and pants getting tighter and tighter over layers of muscle and fat. What the hell was happening?!! It looked almost as if two things were happening at once ... he was getting more muscular and more ... chubby!
He glanced at the two divots he'd touched and realization dawned as he continued to grow...