John wondered exactly how he'd manage to get the whole school to come within 20 feet of his emitter, and then he remembered. Course registration occurred in the same office for all students.
He snuck into the teacher's office who was in charge of this and planted the device on a desk and set it to "on".
He then waited a few minutes. Early registration was to occur in 15 minutes. The first girl to walk in was a tiny freshman girl. As she talked to the teacher, her voice began to change pitch and her appearance began to change.
Within minutes she was a perfect blonde 17-year-old. And her mind would be called a tabula rasa if Voltaire had been there to describe it.
"Like, are there any courses on fashion? I love pink, are any of the classrooms pink?"
This repeated for every girl who walked into the office. They had no idea what was happening to them, but giggled a lot and were presumably happy. Then a guy walked in. To John's dismay, he too was turned into a 17-year-old female blonde. "Like, totally pick my classes for me" the perfect 10 said to the teacher.
John then realized how bad this really was. He too had to go into that office! He got into line outside of it, and asked if he could transfer schools. "Go into that office you are standing in line in front of." He was told by a passing teacher.
One by one, his classmates all became giggling blonde morons. He made his way to the back of the line, but eventually it was his turn. John couldn't run home, the doors of the building were locked and guarded. He had no choice but to enter.