"Regress" you shout focus on being 10 years younger.
Then, you hear a poof sound as a cloud of smoke appears all around you. Coughing, you wave the smoke out of your way, and walk out of the cloud.
"Who booby traps a book!?" You shout out loud, not sure that this is some type of joke. Someone probably stood by you all night whispering the words the girl spoke to you in the dream, and then set the book down, and naturally, you pick up the book and set off the trap. It was an elaborate prank one of your friends must have pulled over you.
"Well, I'll just have to find out who and get revenge...." You suddenly stop, noticing a couple of things. The first being that your voice is higher pitched than it used to be. The second is that the smoke is clearing out of your room, and your room looks a bigger. Third your bra was dangling like there was nothing there to support/. The last, is that your clothes are big on you like you are trying on your older sister's clothes.
You look in the mirror and see you are in deed 10 again. Still in elementary school. The book did what that girl in your dream told it would.
You then...