Shimmy back into the vent to retrieve her dress.

(chapter originally by halofan6743 at writing.com)

Taking a deep breath, Mackenzie steeled herself and slid her arms back into the vent. Her outstretched fingers searched tentatively for the feeling of fabric. She leaned in further, her head now inside the ventilation shaft. Mackenzie shuddered as the tips of her hanging breasts brushed against the cold metal bottom. Still no sign of her dress. Mackenzie huffed in frustration before resuming her earlier position. She was now half lying in the vent, and half awkwardly standing outside it, with her curvy ass and even more on display to the room behind her. Without the bunched up fabric around her hips, Mackenzie found she had just enough wiggle room to successfully shimmy herself further into the metal tunnel.

Figuring she could always back out if she needed to, Mackenzie dragged her torso further into the shaft. The cold grimy metal slid under her body as her feet slowly rose from the floor behind her. A few more pulls and the naked beauty was fully inside the ventilation shaft. And she still hadn't felt any sign of her dress! The animatronic must be able to move further down this than I realized. she thought. Maybe I should slide back out. Who knows how far this vent goes for!

Not a moment later, there was a metallic CLANG! from behind Mackenzie. She couldn't quite see in the tightness of the shaft, but was able to feel it with her feet. A metallic grate had slid over the entrance to the tunnel! Feeling a surge of panic, Mackenzie tried to press the grate with her feet, but it wouldn't budge. And in the tight confines, she couldn't even wind up her legs to give it a good kick. There was no way Mackenzie was coming out of the grate she'd come in. She thought about calling out for help, but quickly decided against it. She definitely didn't want anyone finding her in a position like this!

Mackenzie gulped, already knowing there was only one way she could proceed from here. She began her slow crawl forward, moving through the dusty shaft inch by inch. Her whole body was in contact with the cold metal the whole way. Her nipples, already hard from the cold, got the worst of it. Every time Mackenzie advanced, her sensitive tips were dragged across the stiff, unforgiving surface. She stifled a noise between a moan and a whimper and soldiered forward.

After crawling for what seemed like hours, Mackenzie was reaching her wit's end. Covered in dirt, sweat, and grime, she was whimpering with each movement now. Mackenzie was exhausted and her poor nipples felt rubbed raw by now. Dress and dignity were long forgotten, Mackenzie only craved to be free from this long tunnel that had tormented her.

"Please..." she muttered, her mouth dry. "Just end already..."

A few moments later, Mackenzie got her wish. As the ventilation shaft suddenly...