"...you'll grow an six inches, your body will grow in proportion with that inch, but your head will not, in fact, no matter how big your body gets, your head will stay the same size it is now, why? Because I have a strange fetish. At eight feet tall you'll be able to walk around naked, no one will think twice about it, and by the time you reach twenty feet tall, if your stupid enough to continue to lie that much, people will run and avoid you, except for myself, like a giant monster. You'll feel every extra inch of your body's size, and you'll be invulnerable and immortal, meaning you'll never age. And since a growing normal girl wouldn't be entertaining, you'll grow into an hourglass figure, with breasts the size of basketballs at your normal size, and hips to match."
Jen was about to laugh at him but she felt her body shifting into what Kyle described and could only gasp.
"For your dare, I've got a two parter. First, you'll like five times, your about five foot six inches, so that will take you up to.... eight feet exactly, so I can get a good look at you naked. Second, if you find me you'll transform or dare me, I might change you back or just keep you as you are at that point. Have fun with that growing body Jen."
Kyle hung up the phone, and Jen did the same, she then walked over to the mirror and opened her mouth.
"I was born a boy, I have green hair, I love football, I eat like a pig, and my name is Toby."
Jen watched as her body started to expand, her now much curvier figure grew larger in the mirror, her head remaining the same size. Her body lurched further toward the ceiling until it had finished it's growth. She raised her hand and touched her head, finding that it now could touch both of her ears with her thumb and pinkie. She bent down and looked at herself in the mirror.
"God I look ridiculous, I better be careful." She looked for a few long minutes, "I gotta find Kyle."