Derrick stared at the boy across from him and then back into the hand mirror. Their hair was switching color now, and he felt a tickle in his throat. "It looks like we're turning into each other!" His voice cracked as he spoke, and the new Derrick grinned and nodded. "Yeah! You look like I used to!" After a cough, his voice was Derrick's old one.
The woman placed the masks back on the table, and Derrick was startled to see that they were plain again. He had to brush some red hair away from his eyes, and felt his body starting to shift under the robe. Getting up was a little awkward, as his muscles pulled and stretched. Randy jumped up as well and they both went over to the full-length wall mirrors and dropped their robes. Derrick was a little more muscular than Randy, but they were very similar in size and weight. Randy was probably a little younger, shorter and slimmer. That was changing, quickly. As they watched, the reflections exchanged bodies as their faces had done. Randy frowned as his foreskin retracted and vanished, and his overall package got a little smaller. However, the loss there was compensated by Derrick's more muscular build and attractive face.
Derrick shivered as his own equipment enlarged and regenerated the foreskin, sliding the new appendage with his fingers as his body lost maturity and strength. The woman moved behind them and nodded in approval. "You are both taking this very well, especially you, Derrick." She patted his butt. "Not many young men would be so calm about becoming homely."
It took a little effort to concentrate, and Derrick frowned as he replied. "You said this is permanent, but you mean just for the vacation, right? I go back to being normal when we leave?"
The woman chuckled. "Hanging onto that intelligence as much as you can? I can see the change in your eyes. Just relax, Derrick. You and Randy are going to swap lives while you are here. No one else knows, and you will each get to experience a different family, a different life. You can also experience many other changes, become animals, monsters, or creatures, but as long as you are here these are your 'normal' selves."
"But.." Derrick.... the boy shook his head, feeling confused again. She had not really answered his question. Would they switch... the boy was having trouble concentrating again, and stared back in the mirror as the woman massaged his temples. Too bad his acne had flared up just before the trip. Maybe they could do something... Derrick shook his head. He didn't have acne. But, now he did. Randy had acne. And he was Randy. The other boy was Derrick. He was Randy, a 15 year-old boy who was in a special school because he wasn't so smart as other kids his age.
The other boy was staring open-mouthed, grinning as he looked at himself. "I know stuff! Math, and history, and science! And I'm good in sports! And I have a sister and a Mom and Dad! Oh! They'll be back from the tour soon. I'd better get dressed and meet them." He bolted for the dressing room, leaving Randy still confused, but feeling sorta relaxed and content.
"Did I do good?" He wanted to make the lady happy, and the other boy seemed to like being... Randy frowned again. That had been him, hadn't it? But now he was Randy.
"You did very good, Randy!" The woman checked to make sure the new Derrick was gone, then pressed her hands against Randy's temples again. The confusion cleared a little, and he remembered more. He had been Derrick. OK. He remembered being Derrick, and his family again, but this new face seemed normal to him. "Since you have been so good about this, I am letting you remember who you were. The real Randy is going to forget everything about his old life and just be Derrick. You get a lot of choices."
She took his hand and led him over to another passage. "You have no family - Randy lives in a foster home. That means you can be anything you want to be, and no one will question it. And in two weeks you can either go home as Randy, or start a new life as a beast, a monster, or almost anything else. And if you really want to, you can even be Derrick again."