Lily frowned when her son mentioned the possibility that she might have a better idea, and shook her head. "Short of tapping Horace for his thoughts on the matter, which I'm certain you would not have me to, I don't - Hermione's plan makes the most sense. It's dangerous, far more so than I'd like for any of you to involve yourselves in - but it makes sense."

Turning her head towards the counter she looked at her wand, left waiting there after being used to get the kettle to a boil for tea, and considered for a moment before turning back to her son.

"Of course, I can't let you do this unprepared either Harry. I'll write to Dumbledore and see about getting you a pass to go home for the weekend. I'll show you what I know, and you can show your students." Lily certainly couldn't be the one leading a clandestine DADA course but she would be damned if her son was put to the task without knowing everything she had to teach.