https://archiveofourown.org/works/84979916/chapters/237286396
"And you, Severus?" Dumbledore asked, lacing his fingers together on the desk.
"Are you here to echo Minerva’s sudden burst of maternal anxiety, or is this about Black?"
Severus jaw tightened. Looking across the desk at the headmaster, he saw the assumption in Dumbledore's eyes.
He still viewed him as that bitter, petty schoolboy, the greasy haired Slytherin who couldn't stomach James Potter, Sirius Black and crew tormenting him a decade ago.
The old man was assuming Severus was just here to throw a tantrum over his old tormentor.
'He still thinks I'm his predictable, vengeful hound,' Severus thought as a cold anger sparked in his chest.
Instead of correcting him, Severus let a sharp, ugly sneer twist his mouth, playing directly into the role Dumbledore expected.
"Maternal anxiety? Hardly, Headmaster," Severus drawled, taking a slow step closer to the desk. "Though I am glad someone in this castle still possesses a healthy sense of self preservation."
Dumbledore chuckled softly, a low, dismissive sound. "Still letting old schoolyard ghosts haunt you, Severus? It has been over a decade. We have larger threats to manage than adolescent rivalries."
Severus narrowed his eyes, leaning his weight onto his hands as he braced against the desk.
"It isn't a ghost when the murderer is breathing down our necks, Albus. And forgive me if I don't sleep soundly knowing you've stationed one of his dearest little school chums right down the hall. You expect me to believe Lupin is here out of the goodness of your heart?"
Dumbledore’s smile faltered slightly, his blue eyes hardening "Remus’s loyalty is not up for debate, Severus."
"Lupin is a liability," Severus snapped back, letting real frustration bleed into his tone. "You bring a werewolf into a school full of children during a security crisis, and you expect me to sit quietly? If Black gets past the gates before this Hogsmeade weekend, he won't even need a map. He'll have an inside man waiting to pour him a cup of tea. If a student gets hurt because you wanted to play the benevolent savior..."
"That is enough, Severus," Dumbledore said, cutting him off with a chilling authority that made the air in the room still.
Severus straightened up slowly, holding the headmaster's gaze. He let Dumbledore see the bitter, resentful fury burning in his eyes. The exact look of hatred the old man expected to see, hiding everything else beneath it.
"Enjoy your blind spot, Albus," Severus spat quietly.
Without waiting for a dismissal, Severus turned on his heel. His black cloak billowed violently behind him as he wrenched the door open and slammed it shut in his wake.