Your 21 year old sister Jessy

You go outside your room to find someone to swap with. You see your older sister Jessy getting out of her room. You go to her room and find one of her belongings to wear. You find a pair of sandals and put it on your feet. Once they are worn, your feet turn into those of your sister. They look dainty and well manicured. By wriggling your toes, you can confirm that they are your feet.

"I could probably try it with another clothes. Althought, is it reversible?" you thought.