When Bryan came back from the bathroom, he was glad to find that Sara had not changed anything. She was simply looking through all the different options that the Chronivac allowed. "Hey, Bryan, I had an idea.", said Sara, turning around in her chair. "What?" "What if we played a game where we take turns transforming each other with this? We could use it to test out the features and stuff." Bryan thought about it and figured it would be good for a laugh. "Okay. But I want to put some restrictions into the machine first."
"Okay, so here are the rules.", said Bryan. "We take turns transforming each other with an option of the Chronivac. We can only use one option at a time, but I'll allow certain advanced options if they're relevant, like changing clothes for a gender or size change."
"Whatever changes we make, we must be able to use the Chronivac at all times. That means we need to keep the same intelligence and same size fingers to use it. We also won't have any drastic mental changes, like making one of us forget who we are. The only mental changes we can make are slight personality changes. Other than that, I guess anything goes."
"So, we'll choose who goes first by flipping this coin." Bryan took out a quarter and showed both sides to Sara to prove it wasn't a double-sided trick coin. "Heads, I change you first.", said Bryan. "Tails, you change me first." Bryan flipped the coin and let it land on the table. They looked and saw that the coin landed on...