"Well, I think the answer is obvious," Time said, "We have to use the mirror to switch back our bodies."
"So, all I have to do is look at this mirror and think of... your sister?" she thought.
"Nah... not that easy, sadly. That would give you your body back, but my sister would now be me."
"But then you could just look at the mirror and switch back."
"Well, good point." Tim agreed with her plan, even if it meant being the last one to switch. "Take the mirror."
"...Uh, where is it?" Sarah said, confused.
"Damn, stupid me. It must be upstairs, back in the attic." They both ran upstairs and looked around.
Sarah looked at something glimmering on the ground, on top of a pile of clothes. "Tim, I found it!" she said excitedly.
"Good, now think of my sister."
She thought of his sister, and as she did, they both blinked. But the outcome was a bit of a mistake. When she opened her eyes, she was still wearing Tim's clothes, but now her body was that of Julie's... and Tim's body was again his own. "Wait... what happened?"
"My mistake." He laughed, glad to be in his own body again. He loosened his belt so that it fit well again. "Just think of your own body this time."
Sarah did as Tim said, and just like that they both blinked again. "It worked!" she yelled. She jumped once, and let go of the mirror.
Tim lunged for the mirror as it fell to the ground. Right as it was about to hit, he saved it. "Phew," he said, with a sigh of relief.
"Wait... But Tim, why would you want it? It caused all this trouble."
"But... don't you see? This is awesome. We could experiment. We could do whatever we wanted with this!"
"But... it still caused this trouble. And what if the mirror has some ability we don't know of yet?"
"Then we discover it! This could be amazing." Tim started to sound hysterical.
"Then, let's go to my place with it," Sarah suggested.
"Sure!"
- - - - - -
At Sarah's house, Tim pulled out the mirror. "So, as long as we use this responsibly, we should have an okay time."