She considers the possibility that Draco is some sort of incubus who's placed a lust spell on her. But she doesn't think that's the case. For one, now that she's awake, she feels a lot more clear-headed about him, and surely a lust spell wouldn't have dissipated so quickly. For another, while she'd have to be blind not to consider him attractive, she isn't attracted to him. She can't be. He wields his sexuality like a weapon, not an asset.