Draco,
You must not write to me again. I cannot be the one you confide in, it's too dangerous. If the Dark Lord wants to know something about one of us, he will go to the other and no one can deceive him for long, not even me.
You must realise how lucky you are. If I, and later your aunt, hadn't stepped in, you would be dead right now. But you still walk around with your head up high and look at others with superiority like before. Have you forgotten what you've done? You've failed Him, Draco! No one fails the Dark Lord without punishment and you got off lightly.
Keep that in mind the next time you open your mouth around Him, because no one's going to step in to save you again. Don't forget the Malfoys no longer have that privileged position you are used to. And the only way to get it back is to be trustworthy.
I am telling you to be the good boy your mother believes you to be. You cannot run away from this and, Draco, you must watch when those Muggles are squirming on the floor. He'll want you to watch and enjoy it and He will know when you have looked away from your own handywork.
You came to me for help about this task, but all I will say again is: Do not write to me a second time. I offered you help with your last task and you didn't want it, afraid that I wanted to 'steal your glory'. In the end, I did because you couldn't pull through.
But this time I won't have anything to do with it. Like you said before: It's your job, he gave it to you and you're doing it.
Good luck, Draco. It's time you really do fight for your own glory. I hope for your sake you enjoy it.
Snape.