He took that as a cue that she was apparently capable of fending for herself and began to eat while it was still hot, because porridge wasn't the most appetizing food to begin with, but when it became cold, it was rather revolting.

"I do," he replied after a mouthful or two. "Do I take it you'd like to know what it is?" Which could be taken as a provocative answer, if not for the fact that it was coming from Snape, who didn't have a flirtatious bone in his body.