You decide to try on the BMC racing team skinsuit so you take it off its hangar and go to the changing room.
In the changing room, you strip off all your clothes and lay down the skinsuit in front of you. You put your legs into the legs of the suit, moaning when the Lycra rubs against your erect cock. You pull the suit over your arms and zip up the front, and put on your shoes and helmet. You check yourself out in the mirror, thinking that the skinsuit looks quite good on your slim body. However, when you're about to leave, you feel the skinsuit get uncomfortable for a second. You check the fit and suddenly realise that your thighs are growing! You try to do something, but you stop yourself when your expanding thighs rub against your penis. They swell bigger and bigger until you think that they're going to burst out of the skinsuit. You try shouting for help when you realise that the growth has finally stopped, the Lycra on the brink of exploding. Occupied by your growing thighs, you fail to notice that your calves have been growing as well, and are now the size of rugby balls. Your feet have also almost burst out your cleats, now size 12. As your cock was being massaged by your Lycra-clad thighs, you thought you were just getting an erection, but your dick was actually lengthening down your skinsuit leg to an incredible 12 inches, stimulated by being crushed between your magnum thighs and the tightening Lycra. Distracted by your cock, you don't realise that your chest is tightening into a six-pack and your flat pecs are pushing out until they look like a bodybuilders'. Your biceps start expanding much like your thighs, and you flex and squeeze them, enjoying the experience this time. Eventually they get to the point that you're slightly concerned, but you don't care because your dick is rock hard. The sleeves of your skinsuit are also strained now, making it look like it's about the burst with all of your new muscles. Your biceps finally stop growing, and you start rubbing yourself off, causing your already larger forearms and hands to grow further. As you jerk off, you look your magnificent new body up and down in the mirror, eventually cumming violently in your own face. You rub it in with your large, smooth hands, causing your chin to become strong and angled, your cheekbones to become more defined, and your nose to become a strong, masculine shape. Panting, you admire yourself one more time in the mirror before leaving the changing room and taking a BMC branded bike from the display. You take it outside and hop on, cycling down the street. The pumping motion of your massive thighs against your sensitive cock causes you to suddenly cum in your skinsuit, attracting disgusted and flirtatious looks from people on the street.