"You sure can!" Jack (or is it Jake?) said, adjusting the ray with the proper fixture. He grinned at you before unleashing a blast from the futuristic looking toy, engulfing you in light and tingles.
Suddenly your stomach began to gurgle, and you watched it push out of your disgusting shirt and forward into a pot belly, and then swiftly it began to droop, becoming a paunchy gut. Your butt began to go through a similar process, stretching your pants out, causing holes to appear as the fabric stressed from your growing girth. Your thighs and legs also thickened, rubbing together as your whole body wobbled from the growth.
You felt your whole body widening as it grew to accommodate the new fat, and you felt your pecs bulge out into sizable man tits. Holding up your hands you saw your fingers get thicker, like fat hod dogs. Your neck felt odd as new flab spread down to it, adding a few new chins to your face, which began to plump up, giving you chubby cheeks and thick lips.
Your feet began to get tight in your shoes, so you slipped them off and watched as they split your dirty socks. "Man, my clothes are taking a beating." you said.
"Not to worry!" Jack chuckled as he let out another blast. Your split pants shimmered and began to reform, this time as a pair of sweatpants that had clearly not been washed in a long time. Your socks split off your feet revealing long toenails that had yellowed slightly, surrounded by plump foot flesh. You felt your shirt stretch down a bit, but not enough to cover up your gut.
"Sorry, I like the exposed belly. It's cute and suits you." he said.
You patted your new belly and then your new ass, and felt each wiggle as you did. It felt great. Looking yourself over, you saw you had to weigh at least 350 pounds.
"I'm huge." you said as the gain stopped and you felt your body adjust to the shift in gravity.
"You look great!"