"Well, then you better do a good job of it, mate." He says to Zabini, stepping back, and it’s all the encouragement the other boy needs. Theo nudges her legs apart with his hands—she’d been trying to pin them closed—and Zabini dives in, licking the length of her with a flat tongue. She feels it echo up her spine, and she makes a guttural noise she can’t control, mouth dropped open. He takes it as encouragement, using flat strokes around and over her clit, until her legs begin to shake.