Derek stilled himself, looking up at Stiles in surprise, but then he nodded, mouth turned down. "Okay, yeah, I can. Hold on, let me think..."
After a moment he smirked. "Let me tell you about my sister. Cora, the youngest one, she was fine. A little sassy but not too bad. Laura, my older sister, she was...something else. She liked pranks. I have to check every door I open from now until my dying day."