'Toujours pur' is the motto of the House of Black: it means 'always pure' in French. Reading that, I would think that no one would be surprised that we Blacks have always been in Slytherin; well, all of us that matter anyway. Sirius, my bloodtraitor cousin, was a useless Gryffindor, and my sister Andromeda was a Ravenclaw. Useless, both of them; they were both bloodtraitors of course. Andromeda ran off with a Gryffindor mudblood, and as for Sirius, well, he was a Gryffindor, and I think that that says it all.
I, unlike Sirius and Andromeda, am a Slytherin. I, Narcissa Black Malfoy am in no way a bloodtraitor. I am, however, no a purity fanatic like the majority of my family. I may be a Black by blood and a Malfoy by marriage, but purity of blood does not matter to me in the way it matters to people like my sister, Bellatrix. You see, even though I hate Andromeda for what she did, it is not because she married a mudblood but because she fled from her betrothal and brought sham to our House.
Also, and this would surprise many, I refused to join Lord Voldemort. I personally disagree with his philosophy and methods, no matter how my husband tries to justify them. I see no reason to brutally slaughter mudbloods; we should just ban them from entering our world in the first place.
The way I see it, just because the pureblooded Houses of Black, Malfoy and Slytherin have spawned more fanatics than any other, it does not mean that we are all that way.
You see, though I am truly proud to be a Slytherin, I do not think that we should all be so prejudiced against mudbloods or half-bloods. Nor should we truly act as though we hate those of the Houses of Gryffindor, Hufflepuff and Ravenclaw (why, the only reason we must appear to hate them is because they would probably kill us were we not so cold).
Yes we of Slytherin are, in truth, completely misunderstood. We may all seem to be cold, callous, heartless and snobbish, however you would find that to be far from the truth if you even bothered to try and look. But of course no non-Slytherin would even try to understand us, so we must remain as we are, shunned by are peers… just as Slytherin himself once was.