"Oh, get stuffed! If you remember what Dad taught us last year, about sensing a person's magical strength? I took a look at Hermione when she first came in; and, that girl, Muggleborn or not, has a tremendous amount of power, and, even better, she has an even bigger grudge against society. Combine the two, and throw in her obvious intelligence, and we have either a formidable ally, or the worst enemy we could imagine. I'd prefer her as an ally Honestly; we're going to have enough problems when the time comes without asking for more. And, besides, the time is going to come when "The Boy Who Lived" is going to require a public girlfriend, and it only makes sense that she be Muggleborn, considering Voldemort's mania about purity of the blood. And," he smirked, "if what Percy says about that Ravenclaw are true about smart girls in general, they are absolutely wild in bed!"