“We don't know for certain that she's a warlock, Jessie," said Will.Jessamine ignored him. "Is it dreadful, being so evil? Are you worried you'll go to hell?" She leaned closer to Tessa. "What do you think the Devil's like?"Tessa set her fork down. "Would you like to meet him? I could summon him up in a trice if you like. Being a warlock, and all.”

“Tessa set her fork down. "Would you like to meet him? I could summon him up in a trice if you like. Being a warlock and all.”

“Would you like to meet him? I could summon him up in a trice of you like. Being a warlock, and all.”

“But he would understand,” he said dazedly. “If we explained it to him. If we told him…he would understand.”She made her voice as cold as she could. As calm. “Told him what?”Will only looked at her. There had been light in his eyes on the stairs… And it was going now, fading like the last breath of someone dying. She felt as if she were watching the life bleed out of Will Herondale. “Jem would forgive me,” Will said, but there was hopelessness in his face, his voice, already. He had given up, Tessa thought. “He would,” she said, “He would never stay angry at you, Will; he loves you too well for that. I do not even think he would hold anger toward me. But this morning he told me he thought he would die without ever loving anyone as his father loved his mother, without ever being loved like that in return. Do you want me to go down the hallway and knock on his door and take that away from him? And would you love me still, if I did?”“Then…please, Tessa, don’t tell him what I just told you…”“I will tell no one,” she said. “I swear it…”

“If you do not help me," Tessa said to Jem, "I swear, I will change into you, and I will lift him myself. And then everyone here will see what you look like in a dress." She fixed him with a look. "Do you understand?”

“Then, if you love him," he said quietly, "please, Tessa, don't tell him what I just told you. Don't tell him that I love you.”

“Haven’t I?” Magnus said, and then smiled at him. “Will, you treat me as a human being, a person like yourself; rare is the Shadowhunter who treats a warlock like that. I am not so heartless that I would call in a favor from a brokenhearted boy. One who I think, by the way, will be a very good man someday. So I will tell you this. I will stay here when you go, and I will watch over your Jem for you, and if he wakes, I will tell him where you went, and that it was for him. And I will do what I can to preserve his life: I do not have yin fen, but I do have magic, and perhaps there is something in an old spell book I might find that can help him.”