The Old Switcheroo
It was a very surreal moment when Meryl and Vash awoke. Two screams echoed through the house.
"You- me? How?" Meryl-as-Vash wailed. They thought back to last night.
Milly. Knives. Drinking.
"Knives must've lost control," Vash-as-Meryl said. "We can't do anything until he wakes up."
"You mean I have to stay like this?" Meryl-as-Vash shrieked.
"Come on, it'll be okay!"
"Fine. Touch my body and I will make yours wish it had never been born." Meryl-as-Vash said, storming off. After she left, Vash-as-Meryl jumped up and down experimentally, watching as Meryl's boobs bounced.
Maybe this wasn't so bad after all.
Yes, there are plot holes big enough to drive a Mac truck through. This was a challenge, and the prompt was "Vash is Meryl, Meryl is Vash." But I couldn't explain away why Vash couldn't do anything about their situation in 100 words. Sorry if this bothers anyone!