A few days passed, how many exactly you couldn't be sure. Time flied by in the hazy bliss of sitting on the shelf as a pair of big, size 11.5 running shoes. But, one day, someone took notice of the store and the doorbell dinged.
You could hear two voices: Mike's, and a different softer, male voice. Mike gave the same, blunt and unusual explanation of the store to the customer that he had given you. The other man uncomfortably brushed aside Mike's tales of transformative shoes and socks and people turning into footwear in the back room as insane or some stupid joke. But, just like you, the man felt the same strange urge to remain and look around.
The man browsed the small selection. Unsurprisingly, the "Muscular stud gym shoes" label Mike had placed in front of you on the shelf caught the man's attention. He pulled off his own shoes and dropped you to the floor. It felt incredible having his socked feet slip inside you, despite the fact they were far too small to fill you up. Like Mike had said would happen, with this man wearing you, you gained an awareness of his senses, his body, and his mind. You knew now his name was Jim. He was 25, a computer technician, quiet, shy and not very confident. You could clearly see his thin, short body in a t-shirt and some of the skinnest jeans you'd ever seen. Quite the average nerd. Mousy, weak, and plain; and nothing like the tall, lean gym stud you were when you were human. You could hear his thoughts too, which were mostly him wondering what the hell he was doing trying on these shoes.
You thought about the last thing Mike had said to you, that someone wearing you would turn into you. It was a totally alien concept when you were human, but now you really did have that power. It felt instinctual, like you had natural access to Jim's very physical makeup; and you felt compelled to use that to change the weak, young man into.... You. And so you did. Pleasure filled you, your new power rushing into Jim instantly fell to the floor with a loud moan as you started with his size 8 feet that were inside you, commanding them to grow and transform. You heard Mike laugh loudly in the background. In a panic, Jim tried to pull you off his feet but you weren't going anywhere. All he could do was endure the feeling of his feet growing to fill the shoes... To fill you.
He grunted in resistance as you made his legs start to stretch across the floor, all the while his small toes burst through his socks, long and thick, filling you up completely and now the mirror image of yours. His legs pumped up with growth and blond hair, the same you had always had. The thighs and calves tore the seams on his pathetically skinny jeans. New golden blond hair, the same you always had, poured out from the broken stitching. His hard cock pushed out the side of his underwear, stretching down his leg against the tight denim while cum squirted down the muscular thigh.
Jim held his head and screamed in pleasure. His back grew longer like his legs had done. His stomach tensed and released in waves as abs grew into the identical shape and size you once had. Pecs followed and soon his t-shirt was strained by two decently sized pillows of muscle. You shared in Jim's pleasure as you forced his arms to grow stronger and beefier, shredding his sleeves. Every one of his fingers shivered as his hands also grew significantly larger. Soon they looked exactly like your own.
Not much was left of the old Jim now. His head shifted like the rest of his body had. His face warped and moved like clay. His weak features gave way to your better looking ones. A better nose, a manlier jaw line, smaller ears, and stunning blue eyes. Even his unstylish brown hair turned lighter and swooshed upward into the same trendy cut you always got.
The pleasure faded from both you and now Jim was a carbon copy clone of you when you were still in human form. Mike pulled him up with a helping hand.
"You like that body, boy?" Mike asked, pointing out the larger, hard dick in Jim's ripped jeans.
Jim checked himself out in the reflection of the store's dirty mirror. You were never a bodybuilder, but those years in the gym really paid off and it showed, and now it was Jim's to enjoy. And enjoy it he did. He couldn't help but feel up his meatier form and appreciate your better looks. For some reason it turned you on seeing him as you and enjoying it.
Once Jim had finished admiring himself he turned around to see Mike with his huge socked feet up on the counter once again.
"Now do you believe me?" Mike laughed.
Jim wondered what he would do next. The store surely had more to offer, or he could take what he got and leave with you and his new body. So many possibilities, but eventually you could hear the decision being made in his mind, which was to...