Rob took a vial out of the box before Mary could make up her mind. He showed Mary the label, which was a picture of a mouse. "Okay, let's try this. I'll take part of a vial, then use exactly the same amount of the male human vial afterward. You said you took more of the female human vial after you had changed back completely. This will prove if that was the cause of your regression."
Before Mary could protest, Rob had downed half of the rat vial. He began to feel dizzy, and Mary moved quickly to grab him before his legs buckled. "I told you these things made me drowsy the first time," she grunted as she helped him over to the couch. He laid there, completely passed out. Mary watched him for a moment, waiting for changes, but he still looked normal.
Shrugging, Mary went back to finish the pizza. She kept glancing at Rob, then at the vials, anxious to try another before he woke up. After all, she didn't know how long he'd be asleep, and she had nothing else to do...