You've been with Bellatrix since you were a child. Being from pureblood families, your parents didn't mind you being friends at all. Perhaps that was your biggest mistake, but you felt... comfortable in her company. Everyone around you was a little afraid of the young Slytherin because of her temper and yet you smiled every time she said something silly or acted with hot head.

"The boy's got a temper," she says unhappily, probably referring to young Sirius. The poor boy had already become a traitor to the family at the age of eleven. You didn't know what to think, but at the same time you felt it wasn't your job. Soon you and Bellatrix would be graduating from Hogwarts, and probably your paths would.... a little bit apart. The prospect and sudden thought terrified you for some reason.

But before you could respond to Bella's previous comment, she flashed her eyes to the other side of the library, behind your back, and hissed unhappily while glaring at some unknown student. "What's that mudblood looking at you like that?" she grumbles and frowns. "Should I poke his eyes out?"