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Horny Ghosts	By : PineWreths Category: +G through L > Gravity Falls Views: 10661 -:- 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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Dipper groaned as he began to slowly awaken. The dream he’d been having was heavenly, imagining a warm mouth arousing him, and-
Funny; Mabel doesn’t normally make this much noise in the dreams.
Dipper looked up, and gave a slight shriek of embarrassment.
His cock was out, erect and gently swaying. He had been sitting in the lazyboy in the living room of the Mystery Shack, and drifted off to sleep while another rerun of “The Duchess Approves” played on the TV.
Now, the TV was off, but the overhead light was on, revealing his pants had, somehow, slid to the floor, and he was fully visible should Grunkle Stan come wandering through the door at any minute. The warm pleasurable feelings from the dream were still incredibly strong, but Dipper was more worried about his Grunkle than he was about finishing off a happy daydream. He frantically looked around and grabbed a pillow, jamming it down over his exposed erection.
That caused a very unexpected sensation as something blocked the pillow; He felt the warm dream-mouth abruptly cough and partially bite his penis, causing him to yelp. The sucking sensation withdrew sharply, and as Dipper finally managed to squish the erection flat under the spare pillow.
Ok, definitely not dreaming. The dream-girls never bit Little Dipper.
“Ow, Dip, what gives?”
Mabel’s voice emanated from midair directly in front of Dipper, but he couldn’t see anything. He squinted, pinching himself mentally to see if he was still asleep, when there was a quiet sound of feet on carpet, and a warm mouth enveloped his.
He recognized her taste immediately; Mabel still preferred vanilla-bean lipgloss, and the enthusiasm her tongue had for his was certainly familiar as well. The kiss broke, and Dipper flopped back into the chair, now with more questions than answers as he realized his sister was honest-to-goodness invisible.
Mabel must have seen his look, because a giggle emanated from thin air, and he could feel a weight settle on the arm of the chair, as she said in a conversational tone “Brobro, Gravity Falls has a lot more weirdness than just what Grunkle Ford had in his journals.”
He cocked his head, intrigued and his heart pounding for a variety of reasons, one of which he was fairly sure was naked and less than a few inches from him. He reached out a tentative hand, gently brushing it where he expected her to be, and-
There.
His hand touched flesh, and he could hear her shivering breath as he ran a hand up the side of her bare thigh. “Well now, mister, I thought after the-ahah,” her breath caught as Dipper’s hand shifted to the inside of her thigh and continued its ascent. “I thought after the head-pillow earlier that you weren’t interested.”
Dipper chuckled, saying in an equally low voice “Well, I hadn’t particularly imagined that I’d wake up to getting a blowjob from my sister’s ghost,” his voice taking on a tinge of teasing as his hand almost found its mark.
Now that they were both in college, visiting Gravity Falls was a solidified tradition each summer, and Dipper and his sister had been enjoying each other’s “company” most nights for years. As a result, even essentially blind, he was fully familiar with exactly how best to tease and please Mabel, as a combination revenge and thank-you for the invisible sucking.
Mabel’s voice continued to be calm, but with the occasional hitch in her voice as his hand lingered and caressed at the top of her thigh. “There’s-ah-there’s a cave, on the far s-side of the lake,” she said, stuttering a bit as one finger lingered daringly close to her before returning. “It’s got a waterfall thing, one that runs over a set of these really pretty silver crystals. I was-ooh, mhmmm-I was following some squirrels, and could hear them chittering but couldn’t see them. Ducked under the water to get a better look, and bam! Invisible Mabel.”
He chuckled again, saying “It’s still three hours until dinner; Let’s go take a look-see, shall we?” He removed his hand, causing his twin to give a whimper of disappointment, but as he stood and reached one hand for his pants, he could hear her move, and felt a shove to the center of his chest. He fell backwards into the chair with a “Whoof!” of air.
Suddenly, the smell of Mabel’s skin was very close, and he could hear her whisper huskily into his ear “Oh, we have hours before we run out of daylight. Just sit tight for a second, little bro, and let Little Dipper do his thing.”
With that, he felt her hand grab his shaft, and with a few strokes he was rock-hard again, the confusion-induced flaccidness melting away as his breathing sped up, matching the little breaths he could hear his sister making right next to him.
Then, with a happy moan, he could feel Mabel maneuver his cock, rubbing it teasingly along her once, twice, three times, eliciting a pleading whimper from him before she sat heavily, engulfing him entirely as she let out a groan of pleasure.
Dipper reached forward, feeling the smooth skin of her back, and wrapping around to cup her breasts, teasing the nipples gently as he thrust his hips upwards. Mabel let out an appreciative “MHMmph oh yessiree,” her hips slamming back down to meet his thrusts, each causing her to let out a little involuntary blissful “Ah!”
He opened an eye, and his jaw dropped. For all intents and purposes, it looked like Dipper had his hands forward like a hug-oriented zombie, pants around his ankles as he thrust into midair. He let out a snort of amusement at the sight between groans of effort, and Mabel slowed to rock against him. He could feel her shift, probably to turn and look towards him.
“What-what is it, Dip?” she said, panting slightly as he thrust again. He let go of her with one hand, gesturing around at how he was splayed out in the chair, and she let out a snicker as she saw how odd it was too. “Well, brobro, it’s probably a good thing Grunkle-”
“Stan? Stanley, where in the blazes are you?”
Mabel let out a squeak as Ford’s voice cut her off from the direction of the vending machine. Dipper let out another whimper, this time of frustration as her amazing wetness slid off of him, leaving Little Dipper out in the cold to shiver as a breeze blew through the house.
He could feel Mabel brush past him, standing between the chair and the wall with her hip against his hand as Dipper re-shoved the pillow on top of his crotch. He had just enough time to whisk a blanket over the pillow and his obvious lack of pants, slouching back as Grunkle Ford came stomping into the room, looking around peeved.
Dipper leaned forward, saying “What’s wrong Grunkle Ford?” as he stretched, acting as though he had just awoken from a nap. Which was almost true, technically.
However, as he stretched out, his hand contacted Mabel’s hip, and he could feel her shiver, although she didn’t move and said nothing with their Grunkle in the same room. Dipper resisted the urge to smile, ideas for mischief already running rampant through his mind.
Ford had pulled out his new journal, the ink for the ‘4’ on the front still clear and unfaded, and leaned against the wall as he checked something, snapping it shut and looking around in annoyance again. “Damn it, Stanley was supposed to meet me half an hour ago for a fishing trip, but surprise, surprise,he’s late as usual.”
Dipper kept his attention focused on his Grunkle, nodding attentively while stretching again. This time, his fingers stretched too, which, by sheer coincidence and certainly not careful memorization of where he’d felt his sister standing, caused one stretching finger to run along the edge of her lips and past her clit.
Mabel let out a muffled quiet “Eeph!” the sound suddenly muffled, likely by her hand. Ford looked up, eyebrow raised in confusion, but Dipper just coughed awkwardly, finishing his stretch and again brushing his fingers over a his sister’s clit as he said “Sorry; I guess I make weird noises when I stretch.”
Ford considered this for a second, then chuckled. “Ah, well, you do sneeze like a kitten,” he said jovially, the reminder making Dipper flush with embarrassment.
It was good that his embarrassment already gave him a flush, because he could feel his ears ignite as Mabel grabbed his dangling hand, angling it slightly so one finger was nestled just outside her. He could feel the aching tension in her body, and he gently reached a finger up into her, making a come-hither gesture as he could feel her shudder, the weight of a hand suddenly on the chair arm next to him as she supported herself.
Ford was engrossed in his journal, looking at a sketch in it and grumbling before erasing most of it and reworking it. Dipper grinned slightly, when he could feel his sister shudder again, and clench around his finger, and to Dipper’s sudden terror, let out an audible “Dip!”
Ford looked up sharply as Dipper could feel his sister stumble off of him and towards the stairs. His Grunkle opened his mouth to say something when Mabel called down, sounding like she was about halfway down the stairs. “Dipper?”
Dipper squinted in confusion, before relaxing back against the wall with a snort. Mabel called down again, saying “Dipper, I wanted to show you that cave and those squirrels I was telling you about earlier. Will you be ready to go after I shower?”
Clearing his throat, Dipper called back “Uh, yeah, no problem,” thanking everything that was holy that Ford had wandered into the hallway. His Grunkle snorted out “Finally,” before stepping through the door to the awaiting Stanley Mobile as Grunkle Stan honked the horn. Before stepping out, he turned to Dipper, saying “Now remember, dinner is at seven, and if you’re late, you get leftovers, if Soos leaves you any.”
Dipper nodded, silently wishing his Grunkle out the door sooner, and the moment after Ford nodded and slammed shut the door, Dipper stood and yanked on his pants. He had just zipped up the fly when Ford slammed the door back open, causing Dip to let out a little shriek of surprise.
“Forgot the tackle box,” he said, giving Dipper a smile and a thumbs up as he grabbed a little squat green box, and then the door slammed and Dipper could hear the car peel off.
A few minutes later, a damp and now thoroughly-visible Mabel came down, shrugging on a sweater and squeezing a few remaining drops of water out of her hair. She gave him a grin, her face red from more than just the hot water if Dipper had to guess, but she did have a note of relief in her voice.
“Man, god thing the invisiwater washes out; I was worried for a minute that it woulda been permanent, and that would have seriously crimped my fashion-display abilities,” she said, posing model-style for her brother as he let out a laugh.
Giving him a wink, she jerked a thumb towards the door, before waving her hands and saying “So Dipper, you ready to become a spooooky ghooooost?,” her voice wavering mysteriously for added ghostly impact.
Dipper smiled, and said in a low, teasing voice “More like horny ghosts, Mabes,” as he strode past her her, cupping her ass as he passed. She let out a little squeal, slapping his hand away before dashing out the door.
“Last one there’s a rotten egg,” she called back, giggling gleefully at Dipper’s protesting reply.
“No fair, Mabel, I don’t even know where this thing is,” he yelled, chasing his twin into the trees.
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Horny Ghosts