After stepping onto the bike, Liam remembered that he needed to pick a new water bottle as he had lost his old one. He got back off the bike and walked back into the cycling shop, smiling at the shop assistant as he walked in. He noticed a skinny confused-looking man looking at the different bike frames in the shop, and approached him. "Hey, what's the problem?", he asked in a distinctly German accent. The man looked startled, and replied, "Uhm, I want to get into cycling but I don't know where to start. Liam grinned and said, "You've come to the right place." He grabbed a red and black BMC branded skinsuit, matching gloves, shoes, and helmet, and handed them to the man, who now had a throbbing erection from staring at Liam's meaty cock pushing through his skin-tight attire. He motioned for the man to come over to the changing room and said, "Come try these on." The two men went into the changing room, Liam taking a seat to watch.
"Do you really need to watch me get changed?"
"Of course, I need to see how well it fits."
The man sighed and undressed himself to his boxers. "You need to take it all off," Liam commanded. The man reluctantly pulled down his boxers, revealing his lacklustre hard-on. He then pulled the skinsuit up his legs and zipped up the front, the large size of it causing it to look ridiculous on him. As he slipped on the cleats and gloves, he said to Liam, "This is way too big, it barely fits." As he said the last word, he felt a warm wave through his body. His feet and toes started tingling as they slowly started to expand and lengthen until they filled out the size 12 cleats. The tingling sensation spread up his legs as his calves ballooned with solid muscle, becoming like a pro cyclist's.
He yelled at Liam, "What the fuck have you done to me!" but started moaning in pleasure as the feeling spread further up his body to his thighs, expanding to bodybuilder-like proportions and stretching the spandex of the suit to its limits. The changes reached his groin, reshaping his below-average cock to an impressive 9 inches long and as thick as a soda can, which immediately leaked precum, causing the man to groan even more. The man's chest pushed out into a new six-pack and two meaty pecs pushed out the lycra even further. His previously thin biceps suddenly bulged out to almost explode the now strained skinsuit as his forearms also gained an unbelievable amount of muscle. He started to stroke his improved cock through the material with his expanded meaty hands, before placing the helmet and sunglasses onto his head. His chin squared out and he gained more attractive facial features to befit the new professional cyclist.
Liam stood up from his seat, after wanking off furiously from the scene in front of him. He stroked the new man's penis through the skinsuit, making him moan. "So... Martin, let's ride."
Martin groaned, "Yes," in his new Swiss accent, out of breath. The two cyclists left the changing room, Martin grabbing a BMC-branded race bike and hopping on, grinning at Liam.