Rat Girl

Eric went through the arbitrary procedure of reading the instructions for the medallion. He then set about coming up with a plan for a costume that would wow everyone.
He could be anyone with just a sample of their clothing. The trick was to be able to reveal who he was at the end. He became curious about the mention of partial transformations.
What if he changed everything but his face and wore a mask?
That still left him in search of a body.
He went to his room and started looking online.
He got a quick IM from his girlfriend Gina, MermaidTaco.
He IMed back under the screenname CentaurStick.
They flirted for a little while then she had to go.
He still had no idea what to be.
He looked around his room and saw his Certified Authentic and worn Elvis shoes that his crazy uncle had gotten him. What a nut job.
His rat started to run in it's cage and he pulled it out to play with it. The rat almost got away from him and he elbowed the medallion box off of the table. The medallion rolled under the bed into his souveneir underwear from his summer fling Amber. She was older than he was but he lied well for his age.
"Shit!" He said. The rat reacted and bit him. He dropped it and it ran under the bed.
Eric got down on his knees and reached for the rat. The rat backed into the corner with the medallion and the panties and....