Severus didn't quite look affronted when he found himself face to face with a writhing, wild-looking cat, but he was looking down his nose at it with a blank, unfathomable expression as he so often did at unlucky students - and didn't jump or flinch when it ran past him, but only followed it slowly with his eyes until it stopped, poised to pounce, on his desk. It seemed very interested in the pendulum of a nearby wall clock. He raised his eyebrow, and turned back to her.
"Well. Do come in. It seems you're both staying." He stepped aside. Part of him was irritated, but he couldn't deny that he was pleased to see her, or that he was glad to know she had wanted to come, and had wanted him to know it. It didn't make him any better disposed to the thing that was scattering fur all over his possessions, but it was enough that he wasn't in a terrible mood. "I didn't realize your charity had expanded its mission so."