She frowned. This was the part she was worried about. "Well, I thought about it," she said tersely. "I think you're right. They won't believe us as siblings."
She sighed before clasping her hands with mock enthusiasm. "It's going to be wonderful!" she said with a simper. "Discovery! Yay!"
She returned to her normal expression, which happened to be a scowl. "That was the worst moment of my life."
"Barely," she muttered. She paused and then suddenly seemed to remember who she was talking to, and she straightened up. "Come on," she said. "Let's go in."