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Horny Ghosts	By : PineWreths Category: +G through L > Gravity Falls Views: 10662 -:- Recommendations : 0 -:- Currently Reading : 0
Disclaimer: I do not own Gravity Falls, nor the characters from it. I do not make any money from the writing of this story.

Chapter List
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Mabel had pulled them into one of the empty dressing rooms, pulling the door almost-closed so a passerby wouldn’t see a floating bra and panty set, but not enough to make the employee think someone might still be in there. Dipper had wrinkled his nose in annoyance as he heard a pair of girl’s voices from a few dressing rooms down. They were quiet, full of giggles, and the pungent skunk-stink he recognized made him roll his eyes and try not to cough.
She murmured “All righty, Dip, turn around for this one.” He did as he was bidden, looking towards the wall, and could hear the rustling of paper, and several zipper noises as well as the sound of cloth sliding on skin, before a little timid voice said “Okay, you can look.”
He turned, and felt his heart skip a little, before warming with loving sympathy for his sister. The outfit accentuated the edges of her curves wonderfully, as did the fishnet arm warmers, stockings and black kneehigh boots she’d conjured out of nowhere as well. However, while it was hard to appreciate the lingerie on an invisible form, Dipper could hear her gasp and turn. He stepped forward to peek over the top of the dressing room door, and groaned.
The two girls had disappeared, leaving their still-lit blunt behind in a trash bin. Some old discarded receipts had taken objection to the ember present in their midst and burst into small, merry flames. The trash can was metal, and Dipper was fairly certain it couldn’t spread, but the fire was creating a visible grey ribbon of smoke upwards.
“Oh shit,” the twins said in unison before the sprinkler systems snapped on, alarms blaring as they could hear the employee at the counter for the lingerie shop begin swearing and running for the exit.
Mabel’s head was already becoming visible as the magical waterfall’s effect washed away, and Dipper held up a splotchily-visible arm with a groan as well. After a couple tense seconds, his sister hissed “Go! Go!” at him, waving her hand as he sprinted into the shop, feeling a full-body blush fighting against blood-drained embarrassment as he realized most or all of his nude form was probably visible flopping about.
He screeched to a stop behind an abandoned kiosk as the sprinklers continued their merry rain. Mabel was right behind him, her black sheer teddy slicked to her form, although the water now just accentuated the black rubbery material of the boots. Dipper could feel himself starting to feel a warmth down below in spite of himself, but snapped his eyes back to the entrance. There was a huge crowd just outside the door, the refugee customers and employees of the mall shops.
He groaned in desperate hopelessness. “Man, Mabes, we’ll never make it out without getting spotted.”
His mind began to whir with possibilities for breaking a window and rappelling to safety with some makeshift rope, when Mabel grabbed his shoulder, spinning him as she pointed.
“Look, where the Hoo-Ha’s was; An emergency exit!” Sure enough a looming grey double-door was visible, tucked behind a trio of other little temporary kiosks, and the small shrine erected to keep the former area of the damned animatronic amusements sanctified and uncursed.
They ran for it, with Mabel shooting Dipper a glance. Even mostly-flaccid, she was very much enjoying seeing his “Little Dipper” again, and from how it twinged when he shot her looks, he was appreciating it too.
They came up short on the door, screeching to a stop in the puddles. Dipper just strode towards the door, but Mabel still stood, and in a little playful voice said “Where’re ya going, Dip Dot?”
Dipper turned, confused, and then swallowed as he saw she had straddled a massage chair, her boots on either side matching the fake leather of the seat. As he watched, she winked saucily at him, leaning back to stretch and lift an arm lazily over her head.
You know what? Fire Department responses for stuff like this usually take a while.
He grinned, striding over to his sister to grab her hand, lifting her up and hugging her tight as his lips engulfed hers. She sighed, giggling, and he could still taste a trace of the vanilla-bean lipgloss as he sucked on and released her lip. Mabel pressed her damp form against his, a hand running over the top of his thigh before wrapping around his cock and giving it an appreciative pump.
Then she broke the kiss, cackling as she pushed him gently to sit and lean back in the massage chair. Dipper did, smiling and sighing as she straddled him, rubbing her warm, wet lips along his shaft while she trailed kisses up his chest. Dipper groaned, pleading without words in the sound, and his hips rose to meet hers.
Mabel kissed him on the nape of his neck, the heat causing him to shudder as she drew back and the cold sprinkler water froze the spot. She then lifted herself up, reaching a hand down to guide her before sitting to settle on his shaft, her hips bumping against his as he filled her.
She moaned, leaning backwards to pull his hands up to her breasts. Dipper nudged the cups of the teddy aside, thumbs playing with the nipples as she scratched her fingers down his chest. Dipper’s hips rose to meet hers, and Mabel groaned, slowing and grinding against him between sets of lifting up to settle on and around his member. When he rose forward and gently nibbled one freed nipple, she had gasped, tightening around him, and letting out a happy growl.
A few more minutes, and she had come again, harder this time as Dipper’s breath became ragged. Mabel dismounted, quickly ducking down to suck on his cock, the sudden shift from heat of her body to cold water to the heat of her mouth causing Dipper to cry out, clenching the handrests of the massage chair in a deathgrip as he came into his twin’s mouth.
Mabel just made a happy hum around him, causing him to twitch again inside her mouth, and with a final suck and stroke of her tongue, she swallowed, and gave the head of his Little Dipper a kiss, before kissing him on his birthmark.
There was a distant sound of voices, and in a flash Dipper and Mabel were standing, the afterglow fading. Dipper looked towards the grey door, abruptly aware that there might be someone, anyone, a whole crowd of anyones outside.
His sister noted his worried expression, and her eyes came to rest on one of the racks at a kiosk with an evil grin. Dipper sighed, letting out a defeated groan, and then grabbed a costume

They burst through the door into the bright sunlight of the dilapidated area behind the mall. They were alone, and Dipper sighed in relief. He pulled awkwardly at the wet, far-too-small blue sailor scout tunic and skirt; They didn’t have a lot of options, and he had thoroughly shot down Mabel’s joking proposal when she held out the Slave Leia costume from the Summerween costume rack.
Although, that gives me all sorts of ideas for fun later this summer.
He followed his sister as she ran for the treeline, Dipper appreciating the occasional flashes he got up her identical undersized pink skirt as they ran towards their clothes and the location of the enchanted invisible waterfall.
- 3
- 4
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Horny Ghosts