Jim realized that he had only one real choice. He couldn't spend the rest of the night as a kid, since he needed to meet up with Rick behind the school to reverse the spell, and he couldn't do that if he was constantly being shooed back into the classroom with the other kids every time he tried to sneak off. Being caught by Mrs. Moore was also out of the question, since she would most likely drag him into the principal's office in front of a group of middle-aged teachers (bad idea), who would either be wondering how he changed into an adult in a matter of seconds (if the spell allowed them to notice him change) or why an adult was sneaking around a high school dance (if the spell brainwashed them into thinking he was always the person he changed into). Jim didn't know either way how the spell would work, so he had to be discreet in how he got changed.
Jim looked at the group of attractive girls walking down the hallway and shuddered. Oh well, he thought. It looks like I've got high heels and tits in my immediate future.
Jim walked briskly from the cafeteria doorway towards the group of young girls conversing with one another, but before he could complete his short journey, a hand suddenly grabbed his shoulder. He turned around and saw with dismay that it was Mrs. Moore.
He had been caught! And just like he figured, he was taken to the principal's office. And also just like he figured, the office was filled with three teachers, as well as the principal himself.
As he came within ten feet of them, he felt his body begin to change ...