She was going to scream. Fuck. Severus moved a hand quickly to cover her mouth, the other going for his wand to cast a silencing ward about the room, sparing them any potential visitors should she be louder than his hand could muffle.
A beat later he brought his wand to glowing so she could see that it was, indeed, him.
"It wouldn't have been much of a surprise if you knew I was coming. I'm sorry, I should have warned you."