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Severus was very annoyed to run into Black and Lupin on his way back from detention that night.
He supposed Lupin was out on his rounds, but that didn't mean Black had any business wandering about with him.
Lupin merely gave him a colourless smile and seemed content to pass by without harassing him. Black, on the other hand, did not.
"Wandering around at night again, eh Snivellus?"
"Detention, not that it's any of your business," Severus snapped. "I could point out that you seem to be doing the same. Some prefect you are, Lupin."
Lupin scowled, but said nothing.
Black, however, laughed and ruffled Lupin's sandy brown hair affectionately. "I think he's doing fine. There's bigger fish to fry than me, isn't that right, Moony?"
"Sirius!" Lupin's scowl deepened and he waved Black's hands away. "Come on, let's go. Snape here isn't one of those fish anyway. He's allowed to go back to his dormitory after a detention."
"Is that right? He seems fishy enough to me!" Black grinned like he thought he had just made a particularly witty joke.
"Lovely, Black. Really, simply stunning," said Severus dryly.
Black batted his eyelashes. "Why, Snape, I didn't know you cared."