"Oh." Vicky shrugged. "Well, that's brilliant..." She had to pee. She couldn't be locked in this room because she really had to pee.
"I don't want to make the most of it. I want to get out of here and find the loo," she grumbled. That sounded rude, she realized, and she flashed an apologetic smile.
"Sorry, I didn't mean to sound so... I just really have to pee. I thought this was the loo." She paused, realizing that she still hadn't introduced herself. "I'm Vicky. I think we have a couple of classes together or something."