Cassie got up and went to the door. Marco sounded the same, albeit with a slightly deeper voice. 16 to 20 was a decent bit of time to go without knowing someone. When she opened the door, it was as if someone had put Marco through one of those computer aging programs. He was definitely Marco. Whether or not he had a Yeerk in him was a different story entirely. It was at least Marco's body.
"Come in," she said, opening the door a bit more widely to allow Marco through. She wasn't going to be inhumane about this. All she wanted was to make sure Marco was not being controlled by a Yeerk. When she figured that one out, she'd open up a bit more. But she'd picked a reasonably comfortable looking chair that would be easy to tie him up to and hard for him to escape from.