"I am not happy about this, Narcissa, but I can understand your reasoning. I appreciate the desire to protect your family; I would do anything for mine. Understand this though, if you ever cross me again, you'll find that there are curses that aren't unforgivable that can cause you just as much pain. Do we understand each other?" He glowered at her, waiting her response. She gulped and nodded, and Harry smiled at her, "Alright then, getting back to your original reason for talking with me, I agree that knowing the ins and outs of the so-called "Polite Society" would be an invaluable asset. I'm willing to meet with you on a weekly basis for your offered tutoring. I'm sure that Sirius can get you authorized to visit the school on a Sunday afternoon; if not, well, there are ways around that. By the way, I will be bringing my girlfriend along; this is not up for negotiation. The plans I've got require her to be able to swim with the pureblood sharks and thrive just as much as me."