David ran into the street. Everything out here appeared to be normal. He looked over his shoulder and spotted a couple of the Speedo clad men staring at him through the window of the shop. Without looking back, David dashed into the alley way along side the shop. When he was sure he wasn't being followed, he collapsed onto a wall in despair. He didn't know what was happening or how to stop it.
David plunged his hands into his pockets in frustration but felt his heart stop. Something soft and warm brushed against his fingers. Wincing, he cast his eyes downward at his pocket and saw the tight red material of a Speedo poking outwards. Trembling, David slowly pulled it out of his pocket and held it up in front of him, unfolded. He just had to try it on, he thought. It wouldn't be so bad...he was just so tired...
David looked up and down the alley intently; no one was there. Smiling, he pushed his pants down past his ankles and kicked them with one leg to the side. As he reached for his white briefs, he gave one last look about. The alley was derelict. David grinned at how large his penis was getting at just holding the Speedo and how it was forcing the underpants outwards. He tugged off the briefs and tossed them onto a pile with his shorts. He knealt over and pulled the Speedo up around his ankles. He didn't notice any change, but if he had of looked closer, he would have seen all the tiny hairs across his legs beginning to disappear, and as the Speedo progressed upwards, a tan began to set it. As the Speedo reached David's thighs, he realised he was getting bigger. His legs had enlarged and the flabby skin he used to have across the back of his legs had tightened and became muscle. Finally, after what seemed like an eternity, David pulled the Speedo onto his crotch.
A warm sensation spread throughout his body instantaneously. He opened his mouth in both surprise and anticipation. David's arms elongated until they were perfectly preportional to his man-legs. His t-shirt began to hug his body tightly.
"Oh," David murmered in slight pain. The voice that came out of his mouth was a lot deeper. He felt his throat and sure enough, an Adam's Apple could be felt. He rubbed his hands against his chin, but no stuble formed. It appeared he was naturally hairless. He felt older though, and oddly powerful.
The sleeves of his shirt were now tearing slightly under the pressure of the biceps David's arms were developing. The front of the shirt slid up across his chest as that grew, revealing what little joy-trail the 13 year old had accumulated disappearing into the Speedo. His chest tanned, and as this was happening, mighty abs grew where a small, weak chest had been before. David heard the ripping sound of the collar of his shirt as he grew even taller. A tear appeared in the centre of his shirt. He stroked his hard-on through the red Speedo, smiling softly as the 13 year old cum surfaced through it, before being reabsorbed into the dry, crisp Speedo. David's shirt gave way under the muscle and crumbled to the alley floor, without David batting an eye lid. David felt his penis cry out to him; to go to the other men in the shop. David got up, adjusted the tight red Speedo and began to walk back to the shop.