For some reason you wish to swap bodies with your secretary as your last wish. Maybe you wanted to experience her life.
"Oh god! What the hell happened?" she says really worried and upset, but you are just touching and enjoying your new body, but she (now he) couldn't keep complaining because his mind started to change as if he always was the principal and fortunately your memories didn't change, but you act a bit sexy with your chiefs and co-workers now.
Now you are stuck as Ms. Fisher, a sexy secretary who loves to flirt and have dates with a lot of men.