Oh, she doesnt know yet - but someone does..

Full credit for this work must go to @goodgirlchloe and I recommend following her work - she's incredibly talented.

As Ginny continued on her stroll through the corridor of Hogwarts, her lacy panties decided to no longer continue on your journey and they slid off her ankles and feet, remaining crumpled on the middle of the corridor floor, abandoned and with the seat pointing up for anyone to see. Still engrossed in her book, she didn’t see the Ravenclaw boy quickly dash and pocket the lacy panties having already grabbed the abandoned bra 5 mins ago.

She was now completely, utterly naked, her pale skin flushed from the cool air and a secret, building arousal she didn't understand. For the next few minutes her plump, round, jiggling ass cheeks swayed and jiggled with each step, and between her thighs, her shaved pussy lips, glistening with her own moisture, were on full display to the growing crowd of students lining the corridor and following at a distance. Her large, firm breasts bounced freely, her hard nipples pointing forward like beacons. Yet, she remained lost in her book, a picture of bewildered innocence in a state of complete public indecency.

The silence that had fallen was shattered by a familiar voice. "Ginny! Merlin's pants, what in the bloody hell are you doing?" It was Ron, his face a horrifying shade of crimson, a mix of fury, shock, and profound embarrassment. He stopped dead in his tracks, his eyes wide as saucers, staring at his naked sister as if he'd seen a ghost.

At that exact moment, Harry turned the corner from the opposite direction, laughing at something Neville had just said. His eyes fell upon Ginny, and the laughter died instantly in his throat. His jaw went slack. He saw everything: the swaying of her hips, the jiggle of her breasts, the tantalizing glimpse of her gilded sex between her legs. A heat, fierce and immediate, flooded his groin. He was simultaneously horrified for her and utterly, shamefully aroused. He felt a primal, possessive surge of desire that was quickly squashed by the sight of Ron's murderous expression.

"Oi! Stop staring, you lot!" Ron roared at the other boys, who were ogling with open mouths. "She's my sister!" But his protests only drew more attention.