Severus Snape froze when he heard the familiar voice, he didn't expect that voice to follow him here. Didn't he hear and see that person enough in the school's corridors? Even though he made big efforts to avoid them?
Sirius Black.
Just. Perfect.
His hand clenched harder around his bottle and dark hard eyes peaked from his cloak to look at the handsome man, who decided to sit not too far from him, making all the muscles in Severus' body tense. "What is it, Black?" he snarled, his low voice plain and with a fake tinge of boredom. "Did they kick you out of the Three Broomstick for disturbance?"
His eyes glinted mischievously: "I would have thought you stopped being a loud teenager by now..."