You look at the costume in your hands, it is a little girls woodland fairy costume, in sort of leafy colors. You get up to your feet and try to put it back on the hanger, but you can't seem to let go of it out of your hand.
You're afraid of anybody seeing you like this and thinking you are some kind of weirdo, so quickly rush into the changing rooms at the back of the shop.
Luckily you are the only person there and nobody saw you accidentally go in the female changing rooms you were in such a hurry. You enter the nearest cubicle and pull the curtain shut. Then things start to get really strange.
You find you can now release the costume, so you place it on the bench at the back of the cubicle, but it seems to be calling to you willing you telepathically to put it on 'Wear me, I'll make you look so cute and pretty'. You try to fight it, 'No, I'm not a little girl, I won't', 'It's tiny anyway, it'll never fit, so get out of my head' you think to yourself.
Like you where on auto-pilot you have already stripped out of most of your clothes except for your dark blue boxer shorts. You sit down on the bench still not in control of your actions and pick up part of the fairy costume, some light brown tights. You can move your head a bit and glance at yourself in the full length mirror to the side, watching as you bunch up one of the legs of the tights, like you have seen your girlfriends doing. You slip one foot into the end and pull it over it. 'What the....', you think to yourself as you cannot speak, the foot in the little girls tights changed as you put them on, shrinking to less than half the size of your other foot, changed into a little girls foot. You now realize what is going to happen, but are powerless to stop it. All the costumes fit because they change you! You start to pull one leg of the tights up towards your knee watching as it melts away all the muscles you had built up with 10 miles of cycling a day, removing all the hair making the skin on your legs soft, smooth and youthful, reforming your leg into a slender girls leg, looking like a stick compared to your other leg, but soon they will both match.
You stand up your weak lower legs straining against the weight of your upper body, noticing things seem a little higher to you than before. You pull them up your thighs, watching as they thin rapidly to match the rest of your legs, loosing over a foot of your height. As you pull them over your boxers, they change into a pair of pink panties and you feel a pulling and tugging at your groin as your genitals reform into a more feminine pre-pubescent configuration, you notice in the mirror how they fit so flush at your crotch, so flat at the front. The top band of the tights rests on your waist, which it now makes impossibly tiny, emphasizing the girlish curve of your hips. You almost start to cry, partly because you now look like a freak and partly because of the weight of your muscular upper body straining your little girl lower half.
You sit back down on the bench to get the weight off your feet, which works as they no longer reach the floor sitting on the bench now. You now pick up the dress part of the costume and start to slip it on over your head, your head and neck shrink down to the size of a child, but still look the same. As with your legs, the muscle, body hair and rough skin just melts away as the dress goes over your torso. Leaving you with a delicate, weak girls frame, tiny waist, narrow shoulders, stick like arms, all smooth and baby soft. Your pecks, now soft and ever so slightly puffy showing just the tiniest hint of what they would develop into when this body reaches adulthood.
You hop off the bench and pull the skirt part of the dress down, it rests just above your knees. You cannot believe how much you have shrunk the top of the cubicle now seems miles away. Facing the mirror you almost look like a little sissy boy in a dress, if it wasn't for the 20 year old mans face with stubble and the girlish shape to your legs and the rest of your body. That all starts to change as you don the antennae, as you rest them on your head, you watch as your cropped hair suddenly sprouts out at an amazing rate, becoming wavy, you feel the silky locks tickle your bare shoulders and top of your back. You watch as all your stubble just disappears and your face becomes softer, smoother, more youthful & innocent looking, more girly, your neck becomes more slender and your adams apple melts away. Looking back from the reflection is a little girl in a fairy costume YOU.
As you don the fairy wings, new thoughts start to flood your mind as old ones slowly start to leave..
Suddenly the curtain opens and...