You take the glowing wand and tap your hand with it. Doing that sends a jolt of energy through your body, causing you to drop the stick. You then grasp onto your chest as your body heats up. "Agh! Gah!" You let out several grunts as you fall knees first onto the ground, one hand on the floor, another still holding your chest. You can feel the heat spread more evenly throughout your body. "Gah! Guh! Gah!" You visibly shake with each grunt. Your feet shake twice as hard as you start to feel the tips of your toes moving farther away from the front of your sneakers. You can feel your whole foot contract within, the socks starting to loosen up as well. Looking forward, your long sleeves, which were just a few seconds ago up to your wrist, start to pool and bunch up at the floor, covering up your hands more and more. You look down at your body as the neck hole of your shirt starts to droop more and more. Soon you can see clearly through to your upper body which is looking even scrawnier than it was before, but not only that, was getting that much smaller. "Gah!" Another grunt causes you to shiver, throwing your much too loose sneakers off your feet. You can feel the socks hang on by a thread. You struggle to look back and see that the bottom of your pants legs were taking up more and more what was visibly your socks.
Turning forwards again, you see that your sleeves are now completely covering your hands and what you could see was much more farther away than before. You could feel your boxers loosen around your waist as you dick, the only thing above average for you was getting smaller. You could even feel the pubic hair retreat back into your testicles. As you finally realized you were getting younger, your mind was starting to change. You knew you were a 17 year old teenager, but concepts were starting to change. A trip with your parents was now a trip with your Mommy and Daddy. Going to the bathroom was now going on the potty. You don't take a piss or shit. You make a pee-pee or a poo-poo. Little by little the shrinking stopped and you could gain control of your body's faculties.
You try to get up and although you find it hard to balance with your new body, you manage to stand up. Your pants and boxers immediately fall onto the floor, but your button down shirt easily covers your modesty and upper legs. You look at your sleeves. About half of it was drooping across your arms. You move towards the mirror in your room and look at your new form. You recognize yourself from old pictures as when you were 7 years old, ten years younger then you were before. As you watch your reflection in a mix of horror and confusion, you feel the need to pee. Unable to hold it in for too long, you try to rush to the bathroom only to trip and fall, causing you to start peeing. You are embarrassed, but simply let nature take its course. You realize that stick must be a Magic Wand of some kind and feel you can easily clean yourself up. You get up and take your wet shirt off and see your tiny kiddie prick dribble out some leftover pee. You sigh as you fully understand you are a child now.