Both spoke at the same time, and Iblis even seized the opportunity to grab Snape's black robes to prevent him from leaving. Dumbledore nodded knowingly, not giving Snape the slightest chance to refuse.
"Ah, if it's Iblis's earnest request. Severus, won't you take good care of your student? Perhaps it will make your holiday a little less dry and boring."
Seeing that Snape was about to refuse again, Dumbledore started playing the sympathy card. "You know I'm already a useless old man. It's hard for me to find common ground with the youth of today, ah. Couldn't you discuss that charm you mentioned last time with Iblis?"
Chapter 38