Whether it was the pressure, the tightness, the movement, the erotic naughtiness of fucking Hermione's arse or her own guttural noises, maybe a combination of the whole lot, but it proved far too much stimulus for poor, inexperienced Harry. He felt the surge coming from deep in his groin, gripped tightly to Hermione's waist to try and regain control, but he'd reached a natural finish point and there was no turning back. It was how Hermione wanted it for him, and if it meant finishing with anal sex, well ... there'd be plenty of other nights to make babies with him.