Twilight's smile faded as she looked at her again. Erin started feeling distinctly uncomfortable. The fear that she had felt earlier in the day, when she still half-expected the ponies to notice something odd or weird about her, started trickling back. No other pony had looked at her in any way as if she were at all odd or different, but the way Twilight Sparkle was staring at her made her wonder if this one had noticed something all the others had missed. 