Your 18 year old sister Sam

You think of who to test the power with as suddenly your door swings open and your sister Sam comes into your room. "John, I will go to the mall with some friends from school. Just tell mom when she comes home." "Sure. Have fun." And then she leaves again. You spotted your chance and run to your sister's room. You take of your socks and put on the ones of your sister that were laying around. You look down as you suddenly felt your feet tingle. You see how your feet shrink until they are as big as Sam's. You take of the socks to see two wonderfull female feet on your manly, much bigger body.

You putt your socks back on to see you feet coming back.