"How about this?" Amy asked. She noticed a bottle in the drink aisle labeled "Time Reversal." "If we evolved from apes, this should set you back into one, right?"
Lina took the bottle and examined it. "I don't know..." she said. "What if it just sends me back in time?"
"I don't think even magic can do that," Sam piped up. "It's been proven that nothing can travel back in time. It's impossible."
"And catgirls are supposed to be impossible, too," Amy chimed. She put her hands on her furry hips and swung her tail about.
"Well, even so," Sam defended. "Even if this stuff can change our DNA or however it works, what's in the past is in the past."
As the two argued, neither noticed Lina uncapping the bottle and taking several swigs. "Uh...I feel funny," Lina said in a shaky voice. She dropped the bottle, but Amy's reflexes got her to it before it hit the floor. She picked the cap off the floor and tightened it on the bottle. Then she looked at Lina, who began to change...