If you recognize it, it's not mine. Characters belong to JKR. Quote from Starkid.
"Good morning, class," Remus trumpeted as he meandered towards the front of the room. "Settle down." The class desisted their prattle and bestowed to him their utmost attention.
"Today," Remus hesitated as he acknowledged a girl in the back row. She resembled a girl who may have been in his class, but wasn't quite familiar enough. She possessed bombastic hair, tinged a color Remus couldn't quite see on the end.
"Professor," she challenged in a wail of a voice that was a vexation to the boy beside her; he blanched as she spoke, "could, like, a person be a portkey?"
"Pardon?" Remus inquired, stumped. He deduced that she was paying homage to a current fad, but was dumbfounded as to which one.
"Never mind," she smirked at his confused visage and proceeded to take notes like an obsequious student would.
"Alright," Remus,slightly bewildered, pivoted towards the board, the sleeve of his tweed suit grazing it as he did.
As the lesson continued, Remus discerned that the boy next to the strange girl in the back became increasingly timorous of her. This seemed out of character to Remus; the boy was usually one to promulgate his ideas.
After the lesson, the strange adolescent sauntered up to his desk. "So, Professor," she simpered at Remus, who recognized, then, the color on her tips: pink, Nymphadora's epithetic color.
"Nymphadora, why are you impersonating my students?" She grinned like a cheshire cat as she morphed back to normal.