"Let's each try a different vial out," Mary suggested. "We can explore them twice as fast now."
"Couldn't have said it better myself," her duplicate agreed. "I think I'd like to try the cow vial again. I feel funny saying this, but I miss that tail and udder."
"Ooh, I know what you mean," Mary said truthfully. "But we should probably go with something different. Tell you what, let's keep it a surprise from each other and pick vials at random."
"Good idea," her other self said as she reached for the box. Her head was turned the other way, so she couldn't see what she was picking. As her duplicate's hand groped for a single vial, Mary took the chance to pull out the Age drawer and quickly grab one of the vials from it. Finally, her other self turned around after picking an unknown vial.
She was about to open it and take a swig, but Mary interrupted her. "Why don't we take each other's vials? To make it more interesting."
Her double nodded her head. Mary began to wonder if she suspected her of cheating. Considering they were almost the exact same person, it was a good possibility. Perhaps the other Mary really was a copy, not completely exact as the original? At any rate, Mary knew who was soon going to be the one in charge. "You first," she said.
Now her double shot as suspicious look at Mary. "YOU first."
"Okay, okay," Mary said, trying not to sound suspicious. "On the count of three, we'll both do it. One, two, three!"
They both upped the contents into their mouths, each swallowing about half the vials. Both were suspicious of each other at this point, and Mary wondered if her double had purposefully picked out a vial for her as well, despite her head being turned.
As the two placed their vials on the table, Mary saw a distinct change in her duplicate's appearance. Her hair was growing shorter, and she was shrinking slowly. The other Mary held her hands to her breasts, seeing them become smaller. "Funny," she said in a cracking voice. "I was hoping I'd find one of the age vials to use on you." She had now completely lost her breasts, looking around the age of fourteen.
"Guess we really are cut from the same cloth," Mary said. Her voice sounded a bit different as well, and as a warm tingling spread over her body, she noticed the first of her changes...