Bellatrix gasped; Narcissa seemed to lose her nerve.
“I only meant… that nobody has yet succeeded… Severus… please… You are, you have always been, Draco’s favorite teacher… You are Lucius’s old friend… I beg you… You are the Dark Lord’s favorite, his most trusted advisor… Will you speak to him, persuade him—?”
“The Dark Lord will not be persuaded, and I am not stupid enough to attempt it,” said Snape flatly. “I cannot pretend that the Dark Lord is not angry with Lucius. Lucius was supposed to be in charge. He got himself captured, along with how many others, and failed to retrieve the prophecy into the bargain. Yes, the Dark Lord is angry, Narcissa, very angry indeed.”
“Then I am right, he has chosen Draco in revenge!” choked Narcissa. “He does not mean him to succeed, he wants him to be killed trying!”
When Snape said nothing, Narcissa seemed to lose what little self-restraint she still possessed. Standing up, she staggered to Snape and seized the front of his robes. Her face close to his, her tears falling onto his chest, she gasped, “You could do it. You could do it instead of Draco, Severus. You would succeed, of course you would, and he would reward you beyond all of us—”
Snape caught hold of her wrists and removed her clutching hands. Looking down into her tearstained face, he said slowly, “He intends me to do it in the end, I think. But he is determined that Draco should try first. You see, in the unlikely event that Draco succeeds, I shall be able to remain at Hogwarts a little longer, fulfilling my useful role as spy.”
“In other words, it doesn’t matter to him if Draco is killed!”
“The Dark Lord is very angry,” repeated Snape quietly. “He failed to hear the prophecy. You know as well as I do, Narcissa, that he does not forgive easily.”
She crumpled, falling at his feet, sobbing and moaning on the floor.
“My only son… my only son…”
“You should be proud!” said Bellatrix ruthlessly. “If I had sons, I would be glad to give them up to the service of the Dark Lord!”
Narcissa gave a little scream of despair and clutched at her long blonde hair. Snape stooped, seized her by the arms, lifted her up, and steered her back onto the sofa. He then poured her more wine and forced the glass into her hand.
“Narcissa, that’s enough. Drink this. Listen to me.”
She quieted a little; slopping wine down herself, she took a shaky sip.
“It might be possible… for me to help Draco.”
She sat up, her face paper-white, her eyes huge.
“Severus—oh, Severus—you would help him? Would you look after him, see he comes to no harm?”
“I can try.”
She flung away her glass; it skidded across the table as she slid off the sofa into a kneeling position at Snape’s feet, seized his hand in both of hers, and pressed her lips to it.
“If you are there to protect him… Severus, will you swear it? Will you make the Unbreakable Vow?”