Re: Harry and Ginny's arrival
Snape stepped forward, out of the doorway leading to the kitchen. He inclined his head to Ginny and replied blandly, "As we're not at Hogwarts, do call me Severus." He turned to Harry and gave him another of those nods of greeting. "Harry. I trust you both are well," he murmured politely.
Snape was absolutely determined not to be the one responsible for any deterioration in the evening.