Law of Reciprocity

“I’ll show you mine if you show me yours,” he said, a smirk tugging at his lips, but the glint in his eye was dead serious.

Hermione shook her head vigorously, but her eyes kept returning time and time again to the vague outline of his growing arousal.

“No? Okay, then.” Malfoy licked his lips, as if deliberating. “I’ll show you mine if you touch yourself.”