How does Ron get out of this sticky situation?

Well.. he tries to at least..

Harry burst in and saw the situation in front of him and stared bug-eyed. "Finite!" he roared, but the spell was too strong. It wouldn't break. He grabbed Ron's shoulder, trying to physically pull him away. Finally, as the spell loosened, he slipped his own hands between Ron and Ginny. He cupped her breast pulling it away from Ron's face. and slid his other hand down her stomach, below her toned waist, sliding against Ginny's clit, to free Ron's hand. His thumb accidentally plunged into the moist interior of her lips before pulling out, allowing Ron's hand to pull away completely. The feeling was electric, and a wave of guilt and pleasure washed over her, hot and sharp, even as a dark part of her brain registered the soft, warm, wetness of her folds and the impact of Harry's thumb.

Upon feeling the thumb plunging inside, Ginny felt the full **** of being utterly naked and exposed. Her intimate parts in full display made her gush more between her legs, even more so in front of her crush Harry. Ginny squirmed mercilessly against Harry's hands now.

"Revelio Nuditas!" Millicent cast, aiming at Harry. The spell missed and hit the large sheet-covered desk in the corner. The sheet flew off, revealing not a desk, but a large, ornate mirror. It then flew across the room and positioned itself in front of the struggling Ron, Harry, and Ginny, forcing them to see their own horrific reflection: Ginny, naked and crying, with Harry's hands now fondling her most private areas.

Ginny half moaned and half whimpered, here was her crush, covering her intimate parts whilst they quivered and gushed fluids onto his hands. She desperately tried to resist the urge to cum on him as her face continued to blush deep red and her body continued to squirm and sweat.