The instant he gave her permission, Chas' grin widened. Brilliant. A quick flick of her wand and the man was bound up, magical ropes tying his hands behind his back, and binding his legs together. She would have liked to get him in a chair, tie him down and really play, but ten minutes wasn't enough time for that. Instead, another spell levitated him in the air, and the man began to scream... at least, until Chas knife was at his throat, drawing blood. "Not too loud yet, mouse! Or I'll have to sever your vocal chords..." She gave a mock pout and added, "And that's no fun at all. I much prefer it when my toys make noise."
Smirking, she cast a quick silencing charm so no one outside the room could hear them. Only then did she turn her attention to her captive again, a flick of her wand spinning him onto his back. Her knife was at his chest but dragged quickly down, the blade slicing through his shirt. To Chas, his chest was like a canvas, and she began working on it with her knife, making patterns in his flesh, drawing blood and reveling in the way he moaned and cried out with each flick or swirl of her knife. Salazar she loved this.
Her eyes drifted to Barty after a moment, because she was somehow enjoying this even more with him watching her. After a second's thought, she offered him her knife, handle first, something she never did, and raised an eyebrow in offer. "Want to play a bit, boss?"