I Know I Ought Not to Be Here
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Narcissa Malfoy: I know I'm not to be here. The Dark Lord himself forbade me to speak of this...
Severus Snape: If the Dark Lord has forbidden it, you are not to speak... Put it down, Bella. We mustn't touch what isn't ours. As it so happens, I'm aware of your situation.
Bellatrix Lestrange: You? The Dark Lord told you?
Severus Snape: Your sister doubts me. Over the years I've played my part well, so well I've deceived one of the greatest wizards of all time.
Bellatrix Lestrange: Huh!
Severus Snape: Dumbledore is a great wizard. Only a fool would question it.
Narcissa Malfoy: I don't doubt you Severus.
Bellatrix Lestrange: You should be honored Cissy, as should Draco.
Narcissa Malfoy: ...He's just a boy.
Severus Snape: I can't change the Dark Lord's mind. But it might be possible for me to help Draco.
Narcissa Malfoy: Severus...
Bellatrix Lestrange: Swear to it... make the Unbreakable Vow. It's just empty words. He'll give it his best effort, when it maters most. He'll just slither back into his hole... coward.
Severus Snape: Take-out-your-wand.
Bellatrix Lestrange: Will you, Severus Snape, watch over Draco Malfoy, as he attempts to fulfill the Dark Lord's wishes?
Severus Snape: I will.
Bellatrix Lestrange: And will you, to the best of your ability, protect him from harm?
Severus Snape: I will.
Bellatrix Lestrange: And, if Draco should fail, will you yourself carry out the deed the Dark Lord has ordered Draco to perform?
Severus Snape: I will.

Narcissa and Bellatrix visit Snape so Narcissa can ask Snape to protect Draco.