He isn’t sure what it is about her, exactly. Is it that she’s the perfect swot, the goody-girl, teacher’s favourite, and so on? Is it that she has no idea how hot she is, completely oblivious to how she comes across to others? Is it just that she’s Potter’s girl, the one and only witch he definitely should not want? The one who would give his father apoplexy if he weren't in Azkaban? Is it a combination of teenage rebellion combined with the tempting nature of choosing a Muggle-born? The Muggle-born?