Draco observed with a hungry gaze as she changed out of her uniform. His erection had just abated during their argument and was now threatening to make a reappearance as Hermione bent to pull up the stretchy trousers, her arse on full display and her cunt barely covered. She’d called the knickers she liked to wear, a "thong’. Hermione had informed him that they were quite popular among the muggles.