Snakes Over Wolves
Her expression maniacal, she shrieked, "So what if I'd stolen Winnie's potion?! No matter how gifted she is, she's nothing more than my stepping stone!"
Then, turning to smile at Sirius, she gloated, "Do you think I really love you? Hell, no! You're just the tamest and stupidest mutt at the kennels, believing everything I say every time, even taking away eight of Winnie's lives because I said so!"
Seething, Sirius kicked her to the ground as he roared, "You bitch!"