Ryan's eye was drawn to the large, bright white Adidas shoes sitting on the shelf, he felt as is he needed to try them on. He didn't know what size they were but he could easily tell they were too big for his average size 9 feet. Something was drawing him to them though, he steadily picked one of the shoes up and looked inside, "Size 13 UK" it read, "Imported from England" it read in fine print underneath. "Way too big... And imported from England?" he murmured to himself. Now that he held one of the huge white shoes in his hands, though, he felt even more drawn to put them on. "Well, they are guaranteed to fit" he tried justified to himself sarcastically, when in reality the urge to wear them was just becoming too strong to bear. He slid his shoes off and slipped his feet into the large Adidas's. Sadly his toes didn't get anywhere near the end. He leant down slightly, looking at the too-large shoes and let out an exasperated sigh; he didn't want to take them off though, something just felt... right... about wearing them. It was at this moment a bolt of electricity ran down Ryan's spine, he lurched over wondering what the hell had just struck him. A warmth started to build all though his body, he stood there motionless, worried about what he was feeling, he thought maybe he was having a heart attack. Then it hit him, the warmth exploded through him in a split second unleashing a myriad of sensations, he thrust his head back and gasped, his six inch cock stood to full attention almost immediately, pitching a tent in his jeans. The rush quickly dissipated to a tingle in his feet; Ryan panted, looking down at his tingling, sneaker-clad feet. He felt something like a click or a pop in the toes of his left foot, then again in his right. "What's going on?" Ryan mumbled to himself, slightly panicked.
The feeling as if he were popping the joints in his toes intensified almost immediately to a feeling of intense stretching and pulling, only becoming stronger and stronger, it didn't hurt, in fact it shot bursts of orgasmic pleasure through him. "Ungh! Ah! What's... hngh... happening?!" he yelled. Ryan felt his toes begin to slowly slide across the bottom of the huge shoes, stretching his socks. He shot a load into his underwear, moaning and grunting. His toes growing longer, sleeker, thickening; his soles pushing forward, widening. He could feel his feet becoming long and strong, his toes stretching and cracking; flexing as if to tease him. He continued to shoot load after load of thick cum into his underwear, overwhelmed by his change. His ever tightening socks loosened as they morphed into new white Adidas socks to match the shoes. His calves began to ripple as the energy moved upward from his feet which were still expanding to fill the huge shoes. They began to swell and fill with muscle, brown hair growing across his legs. His thighs creaked as they grew larger and stronger, he was left with the lean, muscular legs of someone who did a lot of running.
His stomach began to pulse and contract, sending orgasmic waves through his cock, prompting him to moan and launch more loads into his already drenched pants, Ryan ripped off his shirt and flexed, grinning as he began to accept the transformation. A faint six pack began to appear on his stomach as his abs contracted and grew. His chest began to push outward slightly, his pecs firming up and becoming lean and strong. "Ah, fuck yes!" he moaned. He had a thin, toned torso, almost no larger than what he had, but definitely far more toned and strong. His shoulders cracked as they broadened, his biceps and triceps heating as they contracted, each time becoming more toned and muscular. His forearms inflated with muscle, hair growing down them as his hands flung open, fingers splayed outward, cracking and popping. His palms expanded outward, growing larger and stronger as his fingers began to push out longer and longer, thickening and strengthening leaving him with rather large hands for his unchanged 5'11" height, just like his new feet which were somehow still gradually expanding.
He felt his adams apple grow as his moans deepened and his facial structure began to change shape slightly. His ears growing larger, nose broadening ever so slightly, jaw strengthening, his hair retracted into a sort of buzzcut. His cum soaked underwear suddenly felt dry, he looked down in surprise to see his jeans and underwear having changed into a pair of tracksuit pants and boxer briefs. He arched his back as the remaining energy shot into his cock. Ryan quickly pulled down the front of his pants, his rock hard six inches sticking out, as it began to throb and stretch. He screamed out as his growing cock fired load after load onto the wall, each time thickening and lengthening. Seven inches, cum shot across the room, a foreskin regrowing over the thickening head. Eight inches, Ryan moaned and grunted as more cum fired out of his expanding cock. Nine inches, he couldn't take it any more, grabbing his huge cock with his large hands, thrusting into it, enjoying the regrown foreskin, feeling it grow in his hand, pushing his longer fingers apart as it expanded and throbbed. Ten thick inches.
His mind began to fill with new knowledge, working out, his life in London, being a bit of a chav, growing up gay. And at that moment he stopped changing, he wiggled his long toes in his size 13 shoes as he shoved his huge cock back in his pants, picking up the polo shirt that had appeared on the floor next to him and left, smirking - keen to convert his old mates into new ones.