"... Emily! That was wild! At first I was confused, but then I saw that Jon was trying to casually cover one humongous 'boner'. You gave him a boner?"
"... No, you gave him the boner. I just gave him a little more to work with. Of course the complete lack of underwear might have contributed."
"...Hee hee.. snort. What's next?"
"... Just a sec while I revert everything to normal..... Ok, now we try it in reverse. I want you to pick out some clothes for Jon to try on, but 'accidentally' include a pair of panties or something in the stack. I want to see if he tries them on while he's changing. Call me when you're ready."
"... Ok. call you in a bit."
After changing into her own clothes, Karyn suggested a little shopping in the mens department. As they walked out together, Jon remarked on the sales clerk.
"They must be sisters or something working here, only the one earlier was much taller. Weird!"