Beta’ed by Dacian Goddess.
No money is made by writing this.
“As you’d thought, the Dark Lord was delighted to know that the previous headmasters’ portraits are bound to serve the headmaster in charge. He relies on you as a source of information about the Order,” Severus said to Dumbledore’s portrait. “He never thought it could be the other way around: that I would be serving a portrait.”
“Very good, Severus,” the painted Dumbledore answered. “This will give us a certain advantage.”
Suddenly, they heard voices from the staircase. They hadn’t even reached the door when a deafening chorus of snores resounded in the study: the portraits had dutifully fallen asleep.