The charm has a 5 minute filter which renders the ENF subject unaware

(All future chapters, credit to goodgirlChloe)

Just then, a voice as smooth as silk and as hollow as a drum cut through the pandemonium. "My, my! What have we here? A performance artist, perhaps? A bold statement on the freeing of the wizarding spirit from the shackles of convention?" Gilderoy Lockhart swept into the corridor, his lilac robes billowing dramatically. His eyes, however, were not on Ginny's face. They roamed over her naked body with an unnerving, calculating hunger. He saw the glistening folds of her pussy, the perfect roundness of her ass, the way her nipples stood at attention. A predator's smile touched his lips. "Fear not, my dear students! Gilderoy Lockhart is here! A simple case of a miscast Vanishing Charm, I'll wager! Stand back and witness the master at work!"

He grandly flourished his wand. "Vestis Reparo!" he boomed, aiming at Ginny.

Instead of clothes appearing, a jet of pink sparks shot from his wand and hit Ginny squarely in the chest. Ginny, who still did not understand that she was naked, let out a surprised yelp as an immense pressure seized her breasts, causing them to swell and press together, looking even larger and more absurdly perfect than before. Her nipples, already hard, seemed to grow another half-inch, standing out like ruby thorns. The effect was not to cover her, but to accentuate her nudity in the most grotesque way. She clasped her legs together with a gasp.

"Ah, a slight recalibration!" Lockhart chuckled nervously, his eyes glued to her enhanced chest.

"No matter! For a more... supportive measure, let's try Levicorpus!"

The spell hit Ginny not with a gentle lift, but with the **** of a cannonball. She was yanked into the air, flailing wildly. But the spell, warped by Lockhart's incompetence, didn't just hang her upside down. It spread her legs wide in a perfect, lewd V-shape, holding her suspended ten feet in the air. The entire corridor was treated to an unobstructed, eye-level view of her most private place. Her shaved pussy, its outer lips plump and glistening, was completely exposed. In the corridor's light, her slit seemed to gleam with a faint, golden hue, her arousal obvious to all. Her "golden snatch" was now the central exhibit in Lockhart's disastrous magic show.

"Good heavens!" Lockhart gasped, though he made no move to avert his gaze. "A bit more... aerial than intended! Finite Incantatem!"

The spell released her, but not gently. She dropped the last few feet, landing in a heap on the cold stone floor. The impact, combined with the lingering effects of the curse, finally broke through. The five minutes of blissful ignorance were up.

The fog in Ginny's mind vanished. She blinked, the book slipping from her fingers and clattering to the floor. A sudden, shocking cold washed over her entire body. She looked down and saw her own bare breasts, her own legs splayed out, her own naked mound. A sound, a strangled, guttural scream of pure horror, ripped from her throat. "AAAAAAAAHHHHHHHH!"

She scrambled to cover herself, her arms flying across her chest and one hand shooting down to hide her sex. She switched her hands back and forth a few times, trying very unsuccessfully to cover everything. She curled into a fetal position on the floor, her entire body trembling violently as a wave of soul-crushing humiliation washed over her. The laughter, the gasps, the murmuring of a hundred voices—it all crashed down on her at once.