You decide to go with a wild idea, instead of one pair, you would try on two different shoes. On your left foot you put a mens size 12 black boot, it was big on you but why wouldn't it be, you're a size 7; on your right foot you put a size 10 women's hot red six inch heel, because if you're going to mess around, why not make it interesting.
You sit there for a few minutes and don't see anything happening, you shrug, it was worth the try, you go to take the heel off and found it wouldn't budge, your foot now fit perfectly inside it, but something odd was happening, not to you but the shoe, it was changing shape, and so was the boot, it seemed to have shrunk slightly and gained more height on it's heel. You decide this was a bad idea and fight to take them off, but the changes happen more rapidly, the heel and boot morphing to match each other, by the time it's done you now have a set of size 10 women's boots, they look like a hybrid of combat boots and go go boots, almost goth style, the changes finish as the boots reach halfway up your calves.
Then suddenly you feel your body changing, your legs, hips and but fill in your jeans, they get tighter and tighter until you hear a pop, the button on the front goes flying toward the mirror, you watch in amazement as your once hairy legs become smooth, but they gain even more definition, muscle piles on your legs so much it tears the pants apart leaving you naked from the waist down and giving you full view of not only your newly formed vagina, but the massive cock that had taken place of your own. The suddenly the pants morph, wrapping your legs once more in a pair of nearly skin tight jeans that give off the fact your packing and extra large cock now.
Your upper half begins to change your watch in the mirror as your torso and arms expand, becoming more muscular but feminine at the same time, breasts shove their way into existence, growing to twice the size of your head as you watch the changes speed up, soon enough there sitting under your normal face from the neck down was the body of the most muscular woman you'd ever seen, and it was all yours, the shirt came back to life, having been shredded by the growth of your now colossal torso, it wrapped your upper half and changed into what looked to be a v neck black t shirt, showing off both your muscles and massive bust.
The last changes were to your face, it shifted, your skin growing more pale until you were ghost like, the rest of your body following suit. your lips puffed out, growing black with your new lipstick, your hair once short grew long and black, tying itself in a pony tail behind you. When all these changes became complete you reached down for your wallet and found instead a purse, you pull out your ID to see who you are now and gasp slightly, your name had now been feminized, you were just a female, no... hermaphroditic version of yourself. You gather up the rest of the shoes and take them back to the shoe isle putting them away, no need to leave a mess, the bouncing of your alien body playing tricks on you.
You couldn't wait to get home to explore your new gothy self.