"What?"
Severus was now glaring at her as if she was the one who had done something wrong. She hadn't. They were her nightmares, she should be allowed to deal with them her way. And her way might mean not dealing, but that was her decision.
"I won't talk to her," she repeated firmly.
"Minerva is your friend. What's the harm?" Even though Severus' voice was calm, his eyes showed how angry he actually was. Most people would find the look in his eyes frightening, but not Hermione. Hermione knew better than to find him frightening.
"The harm is it's my decision, not yours."