"I'm going to finger you until you're just about to come – and then I'm going to stop," Draco said crudely, caught up in Hermione's gleeful mood. Her mouth made an "o" and she pinked, chest heaving with a sharp breath. "I'll leave you right on the brink. And if you don't agree to never tell, I'll do it again, and again, and again. And eventually you'll be so desperate for me to let you come, you'll agree to anything, let alone something as minor as promising to never tell Weasley I called him halfway competent. And then – and then, I'll make you come so fucking hard you'll forget your own name."