You set the device and the ray hits you, as you suddenly feel yourself getting smaller, younger and more energetic. Your pants and underwear fall off completely as you regress, and your shirt just barely manages to hang onto one of your shoulders.
In a few moments, you're exactly five years old again. Standing in the oversized shirt you look down at your tiny body. Youthful energy seems to pour through every vein inside you and it's hard to resist the urge to just ditch the device and go play with something.
You're still mentally an adult, but for some reason just being younger makes you feel care free.
You try to walk around in your new body, causing your shirt to finally release from your shoulder and fall down off you and land at your feet. You're now completely naked.
You can't help but giggle. Your adult mind knows you shouldn't be running around naked, but even if you think like one you know you're physically a kid, and it might be fun to act like it so you decide to ditch the shirt completely and not bother with clothing.
Upstairs you have family that's home, and you have to wonder how they're going to react when they see you, since you set the device they'll know you're supposed to be older. It might be fun.