He actually seemed sad now, and while Astoria found something artistically beautiful about it, she didn't want him to be down either. "Wow," she said, that breathless tone back. "That sounds beautiful," she added, thinking about herself lying amongst flowers, looking happy with sadness overshadowing her. Despite what she might think of herself, it was an image she could imagine and one that she liked. After a moment, she went back to her previous thoughts and said, "Don't be sad," as she smiled and started to run her thumb over his lower lip.
As soon as she realized what she was doing, though, she dropped her hand. Not only was that forward of her, but this was exactly what she was talking about with Daphne just the other day. About liking someone that wasn't good for you because they weren't a pureblood. Then, it hadn't applied to her.