Word count:100
Ignorance
Regulus felt out of place. He knew he shouldn't – after all, he finally had what he wanted: a place in Hogwarts' greatest House – but he did.
It was all because of Sirius, who still hadn't looked at him. His brother had promised, hadn't he? Always together.
"Don't you know anything?" Came the mocking reproach.
"Excuse me?"
"He's a Gryffindor, you're a Slytherin. Give it up."
"…"
"Oh lay off him Malfoy. He's new; you can't blame him for his ignorance."
"Can't I?"
"No. He's mine. I'll teach him."
And if Bellatrix' grin showed more teeth than normal, well, Regulus didn't mind.
AN:
This was written for the 100 Words Exact Drabble Challenge, prompt: Ignorance.