You notice that there's a large selection of costumes in Uncle Jack's shop. You see werewolf costumes, cave man and woman costumes, Star Wars costumes, Power Rangers, ghosts, pirates, goblins, nurses, doctors, and even what looked like anthro dino costumes. You were impressed by the large selection of costumes Uncle Jack had. Finally you came across one that you thought would be a good joke. Picking up a fairy costume that looks like it would fit you you say "Enchanted my ass." You take the costume back to one of the three changing rooms.
Once in the changing room you strip until you are completely naked without knowing why. You normally wouldn't strip naked to try on a costume. It wasn't exactly hygienic. You shudder a little thinking how many people have tried this costume on. Hopefully they weren't completely naked as you were now. "Might as well try it on" you said to yourself as you take it off the hanger. There were three pieces to the costume, the wings, a pair of panties, and a dress with an open back for the wings. The panties and dress were pink while the wings looked like pink translucent butterfly wings with clear plastic straps to hold them in place.
You take the wings and slip them on over your head, putting your arms through the straps. Next you decide to put the dress on. With the wings on you needed to step into the dress. You're surprised by how nice it feels and you don't even notice that you can feel the dress where the straps for the wings are. Finally you pull on the panties. Once you were done you look in the mirror and couldn't help but smile at the sight of yourself in the costume.
Your first hint that your uncle might not have been joking was the wings starting to flutter. This confused you as you didn't think there was anything that would make the wings flutter. Then you noticed that your hair was growing longer. "This isn't possible" you said to yourself in shock. You watch as your hair continues to grow until it's down to just above where the wings meet your body. Then it begins to lighten until it's a platinum blond. Your eyes change from their usual hazel to an electric blue. Your eyebrows thinned becoming more feminine. Your face became softer and more feminine looking. Your Adam's Apple disappeared. The change moved down to your body which lost some of the muscle mass you had gained since you started puberty making it look more feminine. You look at your slim hands and notice that your fingernails were growing longer until they were feminine nails. Two breasts began to push out of your chest until you think they were a B cup.
You hadn't felt any of these changes and you reached a trembling hand under the hem of the dress to feel if your dick was still there. Unfortunately all you felt was flat skin through the panties. Gulping you feel between your legs and confirm that you were now female. "What the hell!" you nearly screamed. "This can't have happened!"
To your horror you find that the changes weren't done yet. As you look at yourself in the mirror you find that you're shrinking. You've gone from five foot four to five foot in a few seconds and you were still shrinking. Down you went in size past four foot, three foot, two foot, one foot, five inches, until you were just two inches tall. You couldn't believe this. Not only were you a girl now but you were only two inches tall. Looking in the mirror you noticed that your body remained proportional so you looked like a two inch tall fourteen year old girl that just happened to have wings on her back.
You don't know how long you just stood there but it had to have been long enough for your uncle to come looking for you since he knocked on the door and asked "What do you think of the costume John? It's neat how my magic works sin't it?" When you didn't answer your uncle asked "Are you ok in there? Did you put on an inanimate costume?" When you still didn't answer he said "I'm coming in there. If you can move make sure that I don't hit you."
Your uncle opened the door slowly so as to give you time to move if you needed to. Fortunately you weren't in the door's way. You saw your uncle look into the changing room but seeing that you weren't your normal height he looked down. When he saw you he got a sad look on his face and asked "Oh John, why did you pick that costume?"
His tone and look told you that something was wrong. You didn't know if he could hear you so you flapped your wings and flew unsteadily up so you were in front of your uncle's face. "I thought you were joking about the costumes being enchanted" you explained. "I put this on as a joke. Please tell me you can change me back?"
Your uncle took a deep breath and said "Well..."