Jufdy and Sam relaxed in the changing room after what seemed to them the best orgasm they ever had. Judy lay on top of Sam and was unaware of the changes going on.
If she would have stood she might have noticed that she was shrinking. Especially her C-cup breasts became smaller and smalle while Sam's A-cups increaed their size. But this was not the only thing becoming smaller. Her whole body shrinked untill she was only 4'3 tall. Her arms and legs changed to match the size as did her breasts. Finally she was looking like a girl of some 11 years.
In the meantime Sams breasts grew to the C-cups Judy lost just as they had jumped from her body to his. He felt more changes going on when finally his body turned into that of a 16 year old goirl.
"Hey! Samatha!" Judy shouted. "Are you ready now? I want to go out to the beach at once"
"Calm down, sis" Samantha answered. "You are still as naked as I am. Lets both jump into our bikinis and then we can go