Sirius eyes Hope and grins, "can you keep a secret?" He asks, and Hope raises her eyebrow at him, which he takes as a yes. He holds his other hand out and conjures the green flames, ignoring the tug of nostalgia at the familiar flickering. "I figured it out about half a month after he did," he admits, "but let him think I’d given up. He was so proud of himself, and I figured if he ever got insufferable about it I could always show him up and put him in his place." Sirius extinguishes the fire. "He deserved the win." He adds quietly.