Teen girl to executive

The girl in the jeans and tshirt changed before his eyes into a woman that could have been the girls mother. The new woman was dressed in business clothes and walking very fast now towards some meeting. He pressed again and the girl returned, very confused as to why she was walking so fast, and walked back to the Fiery Subject store she had been going to originally. John looked at the box. Now that was interesting. But how did it work? Was there a time limit? Was it permanently reversible? Could it only work on girls or would it turn anyone into an adult? And was that really what it did? "Definitely needs more testing to figure this one out..." He said to no one. He looked around for another subject and saw a grumpy looking store manager pacing the front of the store as his employees tried to clean up a box they spilled. Try it on one of the employees or their supervisor? Or was that too many witnesses? And would they even notice? He wondered...