Draco had a way of getting under Hermione's skin and staying there that she didn't care for. Seeing him outside of Augustus" house again shouldn't have been a surprise at all considering his pattern, but his presence bothered Hermione tremendously. For the rest of the night and well into the next morning, she could think of little else. It was her fault that she allowed the enigmatic wizard even the slightest hold on her life. She should've done more to push him away, to resist his surprising charm and she should have never allowed him to seduce her.