Who: Millicent Bulstrode and Severus Snape
Where: outside the Slytherin common rooms and then outdoors somewhere
When: late afternoon
Millicent didn't know if she really wanted to join Professor Snape or not, but she decided in her gloomy state that she would probably enjoy the fresh air. And why not, he was her favorite teacher after all. And she excelled at potion making. It being her favorite subject besides astronomy.
She slipped on her jacket and moved through the common room with Hades at her feet.
"Hades, you're going to knock me over, you silly cat," she sneered, not really at the cat, but at those who were watching her try to maintain her balance. The cat paused and meowed up at her, looking quite cute. "Well, if you're going with me, stop pouting."
The cat followed her obediently to the door and waited for her to open it, going out before her.