Slytherin's bra

As the two girls roll around on the ground, struggling against each other, many other people in the queue turn to watch.

You wait for the perfect moment, as several phones point in their direction and a couple of shouts of "Cat Fight" come out. That was when you chose to strike. Ravenclaw got momentary advantage and rolled, pinning Slytherin to the ground at the exact same moment you snapped your fingers. A slight alteration of reality and Slytherin's bra was suddenly front clasping, and the clasp snapped open, both her shirt and bra hanging wide open her bare breasts suddenly exposed to everyone in the queue, a scream coming from her lips, but unable to cover up, with Ravenclaw still pinning her down.