You find a pair of shiny silvery gloves inside of the box. They seem to be made out of metal but as you pull take them out, they behave like regular gloves. Deciding to put them on you notice how long they are. They almost reach to your elbows or even further. Wait, they actually grow, getting longer and longer by the second engulfing more and more of your arms. In panic you try to pull them off, but to no avail, they seem to be stuck like your own skin. Touching them you notice how hard and cold they feel, very much unlike how they used to be. Your arms feel like they were made out of solid metal. Gradually the changes spread up to your head and your chest. At first everything is getting dark as the metal seems to cover your eyes, then you can see again. Between your eyes you notice a shiny object, far to close to be seen accurately, you reach up to your head and find that it must have grown some odd protrusions. As you try to get to the nearest mirror you feel your clothes getting tight around your expanding chest. As they burst you see that your chest and stomach having expanded to a compact motorcycle engine. Or actually you can't see that as a sizable heat exchanger is in your way. Quickly you try to at least safe your pants and shoes by pulling them off. Under them your skin already feels metallic. As you try to get up you notice that during all of this you must have grown significantly. You'd estimate that you are around 8 feet (2,4 meters) in hight as you walk to the living room where your full size mirror is. Gradually the changes become slower and seem to come to a halt.
Looking back at you in a mirror is a vaguely anthropomorphic fox creature. The eyes that look back at you seem to be simple headlights, their reflector cones merge with the semi spherical upper head painted in a bright shade of metallic red. Large ears protrude from it, and under your eyes there's a stylized set of nose and cheeks, no visible mouth though. Taking your left arm to act as a secondary mirror you notice that a motorcycle cockpit has formed at the back of your head, including a set of handle bars previously obscured by your ears. Looking down further you see a tank and a seat which you can barely make out because of the angles. Then you suddenly notice your arms. What used to be smooth metal now got more structure to it. Joints and shock absorbers have formed, with the springs being visible through openings and vents in them. Your elbow has developed a sturdy joint and the hands itself look like they wear another set of gloves. Of course you try puling them off, but it is no use. Your fingers now have little joints of themselves. The palm and the fingertips have black rubber on them, contrasting with the chrome rest of the hands and gloves as well as your red arms.
Your front now looks like the underside of a motorcycle. Rather plane, but seemingly well protected. As you fumble around it you find a foldable kick stand and foot pedals, clearly you are able to be ridden. On the sides there are openings probably meant for cooling the engine. Turning a bit you finally get a better glimpse at your back. There is in deed a red leather seat back there. It extends to a metallic tail, also red with a white end. Your legs look like beefed up versions of your arms, also sporting joints and shock absorbers, but boots instead of gloves. As you take a closer look you see that they are also chrome, but with thick rubber soles, looking even closer you notice that both of them have a grove between the pad and the heel and in that groove you can just make out what appears to be a gear.
Suddenly you realize something. You rush back the the packet, carefully avoiding any lamps and door frames, and look inside of it. There were still things in that box. Below a lot of Styrofoam flakes you find one 27 inch motorcycle wheel, then another. Instinctively you put them on the ground sitting down in front of them. Pushing your heel groove onto the axles you feel the strange sensation of grabbing them with your feet. Trying the same with the other foot you're finally putting some weight onto it. You balance and turn around with your hands on the ground, reaching for the front wheel. First you try your left hand. Clutching the axle feels strangely natural to you, requiring no effort at all. Then, carefully trying to keep the balance you put your other hand on it too.
Bang! You fall over falling on your side. "Damn! I should have used my kick stand.", you cry out before you realize that you can at least still talk. You release the wheels and get up again.