On one of the racks you see a pair of shoes that are enormous and look completely out of place. Pulling them out, you look at the tag. "Size 20? Who's wearing these boats?" you joke. Even so, you carefully slipped one on, though it didn't require much effort - your foot disappears into the shoes quite easily.
Standing up, you attempt to walk around in the shoes for a few seconds. You can barely move because if you lift up your feet, the shoes start to drop off your legs. Sighing, you sit down to remove them but before you do, you feel hot all over. "What's going on..." you whisper. Suddenly, you feel a sliding sensation on your feet, almost like they're inching along... inside the shoes? As you look, your feet seem to be getting bigger - slowly swelling up to fill the giant shoes. You gasp - you were only a Size 8 before!
As you stand up, you realize a second thing - your head is just slightly higher than normal. Realizing you're growing, you quickly run (as best you can) over to a measuring stick. Your suspicions are confirmed - slowly, you can see your head is rising up and up. You had been 5'7" previously but now you were 6 feet tall - and still growing! "This is awesome!" you cheer.
Suddenly you feel your feet bump against the end of your shoes, and you gasp. That meant your feet were completely filling the Size 20 shoe! Now that you could walk perfectly fine, you place your old Size 8 sneakers next to your new shoes. They weren't even close in size! You wonder what else will change, besides... your height! Standing back up, you reach 6'5" on the height measurement. While you enjoy the growth, you wonder when you will stop - Size 20 shoes would indicate someone tall...
Suddenly you realize that your clothes have not grown with you - they're tighter than you've ever felt before. As an indicator of your growth, your shirt rips in the shoulders, an indicator of your shoulders widening. It also hangs much too high, exposing several inches of your chest. Looking closer in the mirror, you realize - you have abs! Your chest is defined in a way that would suggest you're athletic.
Your shorts haven't been spared either. Thankfully the basketball shorts you wore that day are stretchy, but they ride high on your legs now. You notice that your legs are much longer and have much more hair on them than you previously had. They also look more thickly muscled.
Standing back up, you are struck by how much taller you are. Glancing over at the height measurement, you do a double take - you're now 6'11"! You feel a bit dizzy as you tower over everyone in the store. And you're still growing!
As you pass 7 feet tall, you become aware of an increasingly heavy mass in the front of your shorts. Pulling them back reveals why - your cock and balls are swelling inside your briefs. Your cock lengthened out to what must be around 9-10 inches, with your balls the size of large apples. Although you replace your shorts, there is a sizable bulge in the middle.
Suddenly, the hot sensation finally clears, and you are able to survey your new self. There's almost no record of your old self, save for your old Size 8 shoes and your torn and stretched clothes. Gone is your 5'6" scrawny body, instead you have the towering body of a basketball player, athletic but not bulky. Standing at 7'2", your head is uncomfortably close to the ceiling. Of course, you're blessed in the cock department as well.