Suddenly you notice that you are shrinking. And becoming slimmer. Your jeans and t-shirt are becoming outwardly baggy and your pants threaten to slip off your hips. Actually, they eventually do and you shriek, clasping it to your belly. Your boobs shrink and disappear, leaving two nipples, from before the onset of puberty. Your hips are very narrow, and your crotch loses all its pubes and plumpness, retracting to a simple and modest slit, awaiting any surge of puberty develop, content to just wait for it and not bother about sex. Your body is thinner and juvenile. The one you possessed before you reached puberty, in fact. You touch your hair. It's longer and you have bangs on your forehead. Much you never had, even as a kid! You're a kid again! Why did the fairy do that? How old are you, even? You are drowning in your own clothes here!
"There!" says the fairy in triumph. "Perfect! Except..."
With a swish of her hand, your clothes vanish. You are naked, but just for an instant. New garments drape around you. Pink panties with My Little Pony characters. Frilly while socks. A sky blue dress reaching your knees and with short puffy sleeves. A bit of lace on it. A red ribbon wraps itself around your head and forehead and ties itself in a bow. A pair of bright red flat shoes appear on your feet. And an apron, crisp and ironed and white ties itself to you, along with a red ribbon around your waist. A ridiculous outfit. What is this, the dress put on a good little girl for a family wedding, back in the olden days?
"Ooooh! So pretty!" gushes the fairy. "Adorable! Absolutely adorable! You'll be perfect!"
"For what?... What did you do to me?" you stammer.
"You are now seven, and I slightly changed your initial appearance at that age, like making you skinnier and your eyes wider. Little alterations. You are now at your cutest. I'll leave you in these fairy woods. Fay creatures simply ADORE little mortal children, especially girls. And you're dressed in what they find the most endearing. You'll find someone fast to take you in as a pet or to adopt you. They'll pamper and molly-coddle you to no end! You will attract your new mommies and daddies in no time! And make them so, so happy!"
She laughs and zooms away, leaving you in fairy woods to wait for the first creature to snatch you. A little girl at the mercy of strange creatures. With everything to make them thing adorable. Which isn't good. You need to go back to your normal size and age! So you start running after the fairy, losing yourself in a very short time and making enough noise to attract other fay beings.