He lightly held his finger on the button so that the change would be continuous but gradual. She started to grow younger again, entering junior high territory. The last traces of adulthood faded from her face and her hight quickly dropped several inches as she passed backwards through puberty. When her skirt slipped off her narrowing hips, she let out a squeak of surprise and dropped her book as she reached to grab her falling clothes. She blushed. Then she looked worried. Finally, she noticed.
She wondered how her skirt could have become so loose all of the sudden. Then, she noticed that the rest of her clothes seemed to be getting bigger and looser on her. The sleeve of her sweater hung down past her empty hand. She reached up to touch her chest to find her bra completely empty. Pulling open her collar, she looked down where her breasts once were to find a pair of small pink nipples on her flat chest. Her glasses fell off her face. She started to take a step back in horror and stumbled as her foot came out of a shoe many sizes too big for her now tiny foot.
Looking up, the book shelves seemed enormous to her now. "What's going on?" She said and squeaked again at the sound of her childish voice, octaves higher than it had been in years.
He guessed she was about 9 years old now, only four feet tall. He wondered how much further he should take her.