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Helping Hand	By : Nastyzak Category: +G through L > Gravity Falls Views: 4143 -:- Recommendations : 0 -:- Currently Reading : 1
Disclaimer: I don't own Gravity Falls or the characters from it, and I make no money from writing these stories.

Chapter List
- 8
- 9
- 10
9 Mystic Crystal Boob Inflation
That afternoon, Mabel demanded that Dipper lead the way through the woods to the small clearing where the size-changing crystals came pushing through swampy soil or fastened themselves to damp, scattered volcanic stones. He insisted on taking a weapon along, though it was only a magnet gun from gruncle Ford’s lab. She said she already had her weapon of choice—“Grappling hook!” she reminded him.
After packing a few tools, Dipper donned his frayed, worn oldest backpack, though he had to loosen the straps. “Put on some pants and let’s go,” he told his sister.
Mabel gave him a pouty glance. “What? Why should I have to wear any stupid pants? Don’t you like staring at my bouncy butt and my juicy pussy?”
Dipper nodded. “Yeah, but so might gnomes. Or even worse, manotaurs. You know what gnomes can do when they assemble, and manotaurs just go rut-crazy when they get a little bit aroused. I’m not going unless you—”
“Okay, okay! I’ll wear some pants!” Mabel had not really unpacked, so she dug out a pair of panties and some soft, worn, comfortable jeans from her roll-on suitcase. “Anything else, Fashion Meister?”
“Yes. You shouldn’t wear ballet flats. There’s some rough, wet country out there and at least one steep hill. How about wearing your sneakers and some athletic socks?”
Fastening her jeans, Mabel put her fists on her hips and glared. “We’re not going to Timbuktu, brobro!”
Dipper sighed. “Look, I’ve got to find a way through the woods. I know the general spot, but it’s been years and I’ll have to find it again. On the way we’ve got to cross rocky outcrops, go up and down hills, and walk through wet, weedy patches. Cockleburs, sticktights, and possibly poison oak grow along in there. So if you don’t wear thick socks and sturdy shoes, you’ll have scratches and maybe bruises all over your ankles and your feet will look ugly when Wendy—"
“Enough already, I understand. I’ll wear the shoes,” she said between clenched teeth. “But you owe me again!”
Muttering, Mabel dug out her hand-decorated, colorful rainbow sneakers, made of heavyweight canvas, and pulled them on over a pair of thick white socks. “There,” she said when she had put them on, stamped them to make sure her feet were all the way in, and tied them. Anything else or are we finally ready?”
“Sunblock,” he said. For a change, she didn’t argue. Pines noses tended to pinkness, and they burned and peeled easily, so Mabel dabbed some zinc-based sunblock on her own nose and then on her brother’s.
After their preparations, they finally set out. At first it was a fairly warm day for that early in the year, with bright sun. However, once they moved off the trail and into the shade beneath the trees, they felt the difference and breathed much cooler air. Unlike the town, the woods hadn’t changed even a little bit. Birds still twittered and tweeted, squirrels scurried and chattered, woodpeckers still hammered on trees, and the tall branches of the firs and pines still made soft whishing sounds in the breezes. At one point they turned sharply away from the path they had been following and plunged into the deep woods. Dipper had a rough GPS location for the crystal clearing, but his phone wasn’t all that dependable under the cover of so much foliage.
“Are you sure this is the way?” Mabel asked as they edged carefully across a fallen tree that bridged a narrow, swift whitewater creek.
“Pretty sure. I didn’t come exactly this way, but we’re heading in the right direction. We should come to a dry creek bed soon, and we’ll follow that away to the right.”
They had walked for nearly an hour when Mabel suddenly said, “Why were you even worrying about my feet getting bruised and scratched? Does Wendy have a foot fetish or something? Do you?”
“Huh?” Dipper said. Though he wouldn’t admit it out loud, he felt lost. They had climbed up the slope of a ridge, and on the far side the ground dropped steeply away into a ravine, probably the old creek bed, although Dipper was starting to wonder if it were the right one. At the moment he was pushing some long-needle pine branches away so he could squeeze through at a place where the ravine banks were not so steep. “Does Wen have a thing for feet? I don’t think so. How should I know?”
“I dunno. Thinking about feet and sex and stuff. Would it matter to you if she like wanted you to suck her toes?”
“No,” he said. “But, uh, don’t say anything about that to her. I don’t want her to think I’m some kind of perv.”
“Too late for that! Hey-yo!”
Dipper deliberately let go of the pine bough and smiled as it whooshed into his sister. She yipped, “Hey!”
“Here’s a good way down. Follow me and don’t trip.” He scrambled down a low, mossy cliff. “This way, I think,” he said from about three feet below her. “Yeah, this looks familiar. I think the place where the crystals break through the soil is really a plugged-up ancient geyser—”
“Broseph! Little help?” Mabel made her voice sound pleading.
Dipper turned back toward his sister. She stood poised, knees hesitantly bent, on a boulder about three feet tall. “Jump,” he said. “It’s not that far.”
“Yeah, but these dorky shoes make me feel awkward. Catch me so I don’t fall—please?”
Rolling his eyes, Dipper stretched out his arms toward her. “Okay, I got you. Jump! Oof!”
She leaped with more force and came down harder than he’d expected, and he took one step back before falling flat on his ass on damp ground. Mabel landed straddling his waist and with a whoop swept the hem of her sweater over his head. “Brobro! The crystals had a weird effect! I’ve got THREE boobs now! Ah ha-ha!”
Dipper, pinned down by her thighs, writhed and tried to twist his head. She was right, he thought. One big soft boob on his left cheek, another on his right, and his big boob head right between them. Mabel started grinding against him, giggling like crazy.
Dipper wriggled, but she pressed her ass down harder and squeezed him with her thighs. With a groan, Dipper complained, “It’s not that funny! Get off me.”
Mabel did, grinning, and reached down to help him up. “You hurt my boobies’ feelings,” she said accusingly, holding her sweater up to her chin. She lowered her head and blinked her big brown eyes appealingly. “Apologize and kiss them to make up!”
She did look pretty fetching there with her tits fully exposed. The sun streaming here and there through the forest canopy dappled her light-peach-colored skin with ovals of light. And her breasts were nice and softly round, her nipples pinkly perky. Dipper cradled a breast in each head and murmured, “I’m sorry I dissed you, Boob One,” as he took her right nipple between his lips and popped it before giving it a lick with his tongue. “I ask you to forgive me, Boob Two.” He repeated the performance with the left one. “Now, Mabel, can we go look for the crystals, please?”
She twisted back and forth, making her boobs bounce for him as she licked her lips. “Do we have to go right away? Are you sure you don’t want to fool around al fresco?”
“I’m sure. For one thing, anybody or anything that came along might see us. For another, the ground is squishy and wet here, and I don’t want to wallow in mud like Waddles. For one more reason, it's too cold to get naked comfortably. And finally, if we’re as close as I think we are, we might run into a dragonfly six feet long, or a pride of six-inch-long mountain lions.”
He started ahead, and behind him she snickered. “Uh-oh! I think you wet your pants!”
“The ground wet it, Mabel. And you caused it.”
“Sorry! Take ‘em off and let ‘em dry if you want! I won't mind.”
“No, thank you.” Though the weather was dry, marshy, damp soil lay all along the bottom of the ravine, patches of mud alternating with clutters of water-rounded stones, and then they had to push through tall spiky weeds for a hundred yards or so. Dipper warned, “Soon as we get back to the Shack, we’ll have to check each other for ticks.”
Mabel sounded panicky: “Yuck! Ticks?”
“It's still pretty cool for ticks to be active, and there may not be any, but where you find deer, you’ll often run into ticks because—shh, look over there, under the mushrooms!”
“D’aww!” Mabel, following Dipper’s pointing finger, saw the teeny tawny deer, a buck and two does, grazing beneath the shade of white-and-red-spotted mushrooms. “They’re so eentsy!”
“Which tells us that the crystals are just ahead. Yeah, see, the ravine opens out here. Actually now I'm pretty sure I came down that slope over there to the right when I first discovered them. We’ll go back that way, it’s a bit of a climb but once we get to the hilltop, it's an easier path. See the rocks lying around in the grass? Some of them have crystals on them.”
But Mabel knelt and clucked her tongue, trying to lure the timid miniature deer closer. She gave him a sideways glance. “What with the which now?”
“Please leave the micro-deer alone, Sis. You know they must be afraid of anything as big as you are to them.” Dipper tugged at Mabel’s sweater.
“Okay, okay,” she grumped, getting up and brushing wet pine straw from the knees of her jeans. “Those scattered rocks over there? Are you sure—oh, wait, yeah, I see some crystals!”
“Stay on this side of the clearing,” Dipper warned. “Keep the sun at our backs. On the far side a ray beaming through might shrink you or enlarge you. And since it’s the sun, it works faster and harder than a flashlight beam does.” He took a small rock hammer from his backpack. “There are a couple of good-sized crystals right there. I’ll see if I can chip them loose without breaking them.”
He knelt beside a dark gray, pitted boulder about twice the size of a basketball. It sported six or eight clear, faceted crystals, most too small, only as big as a fingernail, but two of them about the size of a business card. Carefully, he tapped near their bases. Both of the crystals moved when he tugged at them, and with a few more taps, they came loose in his grip.
“What makes you think this used to be a geyser?” Mabel asked, bending over to watch, hands on knees.
A little surprised that she had paid enough attention to remember that, Dipper said, “Well, for one thing, the ground’s always pretty moist. And one other thing. Put your hand on the rock and feel it.”
“It’s warm!” Mabel said. “Warmer than the sun would make it.”
Dipper stowed the two crystals safely in his pack. “Right. And wait just a sec.” He used the rock hammer to help him pry another, smaller rock out of its place. It left a muddy, mushy cavity, and he pointed to it. “There, see? Steam.”
“Oh, yeah!’ Mabel said. Swirling strands of thin gray vapor drifted up from the small hole Dipper had made.
“It’s like that for about a thirty-foot radius. My theory,” Dipper told her, “is that thousands of years ago this was either a boiling spring or a normal geyser, erupting every so often. But gradually it lost its heat, and rain run-off and floods filled the crater up with soil and stones. The steam that still seeps through must be full of weird Gravity Falls minerals, and as it comes through the rocks, the minerals condense into these size-altering crystals.”
“Thank you, gruncle Stanford,” Mabel said. She pointed. “I see two more good crystals close there, over on that rock. Take ‘em for insurance?”
“Maybe I should,” Dipper said. They were larger than the ones he had chipped loose, and they just might work more efficiently. He used the rock hammer to crack the stone around the crystals, wiggled them free, and then as he plucked out the second one, jerked his hand away from the stone. “Get back!”
“Huh?”
“Snake!”
Mabel had to hear it, a strange, nearly electronic buzz. “Whoa!”
She jumped to piggy-back position. Dipper stumbled around under his sister’s weight. “Get off me! The snake won’t bite you! It’s down there on the rock!”
“I see a stripey worm!”
“No, that’s a northern Pacific rattlesnake! But it got shrunk. It probably likes the warm stone on its belly. Get off me, it can't hurt you!”
“Can’t we just go home now?”
“Yes, but I’m not gonna carry you on my back! Get off me and we’ll go!”
Once she was on the ground again and they were a hundred steps uphill from the boggy clearing full of stones and crystals, Mabel finally released her tight grip on his arm and asked, “Did it bite you? Do you need a hospital?”
“No, I saw it coiling up and jerked my hand away before it could strike. But if it had bitten me, it’s only about two inches long, and I bet the venom wouldn’t be worse than a wasp sting. Come on, this way. It won’t take us as long going back because the forest here is thinner. In about half a mile we can hit the Mystery Shack tram trail again.”
As they walked, Mabel said, “Sorry for freaking on you there, Dipper. I just have this thing about not wanting snakes to bite me.”
“Yeah, I think a lot of people have that—shh, look, there’s a gnome crossing the path ahead of us. He sees us, but he’s just going on his way. Must not be one that we know.”
“I saw his red hat. We’re not even close to gnome territory here, are we?”
“No, it’s a couple of miles off to the right. That one’s probably just out hunting.”
A little way further on, Mabel casually asked, “Did you know that when guy gnomes make love, five of them gang up on one female?”
He blinked at her suspiciously. “What? A gnome gang bang? Where did you hear that?”
“Jeff told me one summer. You know back when they kidnaped me, there were five of them inside the Norman disguise. And since we were engaged before I blew them off, Jeff explained what woulda happened if we’d gone through with the marriage. See, when the gnomes make love, it’s five males on one female. One gets her pussy, one gets her ass, one gets her mouth, and she jerks off the other two with her hands. And then they rotate until they’ve all squirted inside her womb.”
“Too much information,” Dipper mumbled.
“Yeah, that’s why they were so interested in marrying me. They thought with a human-sized wife, they wouldn’t crowd each other so much. A lot of fist-fights break out when the males jostle each other while they’re fucking a gnome girl.”
“Don’t want to hear any more,” Dipper said.
“And also that same summer Jeff showed me that a gnome’s prick is surprisingly large for his size, even if it's limp.”
“La, la, la,” Dipper sang loudly. “Not listening here at all, la-la!”
As soon as they returned to the Shack, Mabel said, “Ever since you mentioned those ticks, I’ve felt itchy all over. Check me out right now?”
“Sure,” Dipper said. “But let’s go up to our bathroom. Or better still, the bedroom. The light coming in from the window is better. It’ll make it easier to spot any parasite we might have picked up in the woods.”
They went up to the bedroom, Dipper tossed his backpack on the beds, and they both stripped. “I’ll do you first,” he said. “Stand with your feet apart. Oh, wait, let me go to our bathroom for your big detangling comb, and then get on your knees. I need to look through your hair first.”
Mabel grimaced. “Ew! Wouldn’t I feel a tick in my hair?”
“No. When they bite, they give you a little shot of something that anesthetizes the area. Just a second.” He went to find the comb and a flashlight, and stood over her as she bent her head forward. Slowly, trying to concentrate just on the search, he looked through her thick brown hair. “All clear,” he said at last.
She raised her chin, grinning at him. "Mm, I like the view!" She nuzzled his half-hardened cock. "Blowjob break?"
"Don't distract me. Now stand up, feet apart, facing away from me, and rest your hands on your head. Hold your hair off your neck and shoulders for me.”
She turned her back to him, and Dipper closely surveyed her inch by inch, slender neck, shoulders, armpits, upper arms and elbows and forearms, then her long S-curve of a back down to her peach-like swelling hips—he gently tugged her ass cheeks apart, making her giggle. “Would a tick crawl in my butt crack?”
“You never can tell. But I don’t see anything suspicious.” Just her pink bud of an asshole, that’s all. Then he surveyed her thighs and calves before having her turn around. “Raise your chin.”
Nothing on her neck, her earlobes, or lurking behind them; nothing on her boobs or—he lifted them each in turn—clinging to the undersides. He knelt to finish up the inspection. Nothing on her tummy or in her navel, nothing in her pubic hair—“I think you need to shave again,” he said. “You’re getting stubble.”
“Yeah, I can take care of the stubble myself. I’m also getting turned on and might need a little help with that,” she said.
Nothing on her love-mound, or in the folds of her labia, nothing on thighs, knees, or calves. “You’re clean, Sis. Now do me.”
"This is turning me all the way on!"
"Business first, Mabel!"
"Okay, okay." Mabel obligingly stood over him while he knelt and combed through his hair, then repeated his close inspection. When she had him turn to face her, she giggled again. “You’re getting a hard-on!”
“It’s difficult not to,” he said, his dick at a ninety-degree angle and twitching for more altitude. “Not when I see you all naked. Not when a couple of minutes ago I was on my knees and could smell your pussy perfume.”
“You're so sweet,” she said. She gently slapped his dick, making it sway and bob. “I didn't find any ticks, but please please PLEASE let me give you a light trim down there. I don’t like springy little hairs in my mouth, and I don’t think Wendy would, either.”
“All right,” he said with a sigh. “If you’ll promise to be very careful.”
“Roger dodger! I’ll shave my stubble this afternoon and do you at the same time. We're tick-free, Brobro. Now show me how you rig up the shrink ray.”
He reached down for his shorts, but she stepped on them. “Nuh-uh, show me naked how you rig up the shrink ray!”
It was distracting, but in ten minutes he had used elastic bands and a cardboard frame to fit the flashlight with one of the larger crystals. He pointed the flashlight at one of Mabel’s discarded sneakers. “Let’s see. You never can tell which facet is which until you try it. Here we go.” He switched on the flashlight, sending a blue beam streaming over the sneaker, and instantly Mabel’s shoe became the size of a canoe. “That’s enlarging. Now watch. I turn the crystal to the opposite side. And this ought to be the side that does the—” He shined the light on the shoe, hitting it with a pink beam, and it dwindled down enough to fit a Barbie. “—um. Shrinking.”
“I know how it works, remember? Now can I bring my shoe back to normal?” Mabel asked, reaching for the flashlight.
“Just very short flicks of the switch,” he said, handing the shrink ray over. “This crystal seems a lot stronger than the one I took home with me. Let me turn it to the opposite side—there. Here’s your left shoe. Be very careful enlarging the right one and see if you can make them match.”
The first try blasted the shoe with a blue ray and wound up with a sneaker that Manly Dan could comfortably wear, and the next pink-ray reduction took it down to toddler-sized. “This IS tricky,” Mabel said, her tongue sticking out from the corner of her mouth. "I used to know how to do it. Let me go again."
A few more tries, and the shoe was like Goldilocks’s porridge, just right, fitting her foot perfectly. “Great!” she said. Then she grinned evilly. “One more thing I want to try.” She aimed at her brother.
“Mabel, don’t!” Dipper blurted. The world turned pink for a moment. “NOoooo!”
Suddenly he was about the size of one of her fashion dolls, gazing up at what had become a naked, giant Mabel. “You are in my power!” she said. “Mwah-hah-hah! Oh, come on, brobro, I’m not gonna hurt you! I just want to play around a little. Don’t squirm.”
She reached down and picked him up, closing her fingers gently around him, and then she hopped onto the bed and sprawled on her back. She made Dipper stand on her stomach. “Your little feet tickle!”
He had to fight for balance, because standing on her tummy was like being in an very active bouncy house. “Mabel, size me up again!”
She laughed. “Your voice is so high when you’re like that! How do my boobs look to you, little Dipper?”
“Like a couple of hills,” he said. He was standing just below and between them. “Very pink and pretty hills.”
“Yeah,” she said, her grin becoming lascivious. “I can see your little mini stiffy! Why is it all of a sudden angled down?”
“Because I’m embarrassed and scared and I’m losing my erection!”
“Oh, let’s fix that. Come and climb on my boob, Broseph." Her hand gripped him again and she patted him against her left tit, caressing him. "It’s like cuddling a little naked kitten! Rub my nipple. Lick it for me. That ought to pump you up!”
To Dipper her engorged nipple was the size of a half-pint glass, but pliable and springy. He hugged and squeezed it and then licked around the x-shaped pores, the milk ducts. Mabel sighed and the nipple grew even stiffer and harder. "How’s that?”
“Nice, but I like your full-sized mouth better,” she said. “Lets see if you can make me cum. If you can, I’ll resize you, and you can shrink me. I want to be small enough to climb up your cock! It’ll be like making love to a fairy princess!”
“When I’m this small, I’m not even sure I can make you cum,” Dipper objected.
“Oh, sure you can! My naughty little clitty would love some attention. Okay, I’m bending my knees and spreading way open for you, little bro! Go on down there and see if you can make me yelp!”
God, her stomach was like a low, gentle hill but as springy as a trampoline, her bellybutton a scooped-out hollow three-quarters of the size of his foot. He waded through her ankle-deep, but silky soft, pubic hair, slipped down her upper thigh, and stood in awe. Her pussy seemed as tall as from his own navel to his chin, like a gleaming pink close-up like in a classy high-def porn movie. He had seen macro photos of pussies often enough online, but the real thing, radiating its soft heat and scented with female desire, was a bit overwhelming.
Hoping he was doing it right, Dipper closed in with Mabel’s slit and started to stroke the frilly labia and to touch the sensitive clit gently. From this point of view, the clit was amazingly similar to the head of a penis—if a penis were about two inches in diameter. It looked extraordinarily vulnerable, peeking out from its taut cylindrical sheath. Under his palm it quivered at each touch.
He heard Mabel hoarsely whisper, “That feels nice, brobro. Here, I wanna try something.”
She reached down, picked him up in one hand, and then said, “Straighten your legs. Feet together Point your toes.”
“Mabel!” Dipper yelped, “Don’t put me inside you!”
“Not ALL of you,” she said, using her other hand to hold her slit open and to guide his feet into her vagina. “Just in about up to your waist, and then you can reach up with your hands and make my clitty feel good!”
Dipper felt his feet, legs, and butt glide into his sister's slippery pussy. She somehow rippled the hot muscular lining over his body. He squirmed. “I don’t like this!”
But, in a weird way, he did. He felt the walls of Mabel’s vagina yield and then he was half-buried in her warmth. She was really excited, and he could even see droplets of her juices forming and flowing, felt them lubing his whole lower body. At the same time, right above him he saw her clit, and he reached up to fondle and caress it.
“Bend at the waist. Move your legs,” she urged. “Don’t kick hard! Sort of—like you’re on a bike and pedaling. Ooh, I feel that! Now you can go faster—yeah! And now treat my clit rougher! Oh, yeah! Hang on! That's fucking fantastic! Faster now! Rub that clit! Work my juice into it. Pump those legs! Is your cock stiff? I can’t tell! Ooh, what you did just then—stretch your foot back UH-up where it was! Great! That’s my G-spot! Work it with your toe-OH-OH-OH SHIT! YEAH! I’m gonna—AHHH!””
Dipper coughed as she gushed and he inhaled a little of her ejaculate. Then he pushed and dragged himself out, his slick butt making a sucking sound as he came out of the still-quivering slit. Mabel fumbled around for him, caught him, and raised him to her face, where she planted a gigantic kiss on him. “Thanks, brobro! Was it good for you?”
“Not so much,” he said. “Make me big again.”
“You got it,” she said, reaching for the flashlight.
“Turn the crystal the other way,” he told her “One click—there! Stop. Take me off the bed—don’t drop me! Wait until I’m over here. Now, short flicks of the button, all right?”
With brief flashes of blue light, she doubled his size, then doubled it again so he was about four feet tall. “Aw, now you look like you did when you were ten!” she said. “You’re adorable!”
“Keep going.”
She continued enlarging him by degrees, until he was just under six feet. They stood back-to-back to make sure—she had grown into a tall girl herself, Pines genes—and then she sniffed him. “Mm, you still smell like my pussy!”
“Somehow I’m not surprised."
She toe-danced a little way, like a nude ballet dancer, and then said, “Fair’s fair. Shrink me! Fairy princess time!”
“Are you sure?”
“Sure I’m sure, Dip! This is a milestone day! You finally penetrated me—”
“I don’t think that really counts!”
“—and I wanna have some fun exploring you! Make me—make me the same size as your cock! No, a little smaller!”
“Six or seven inches?”
“Yeah!”
“Let me get a ruler.”
Dipper was more used to controlling the shrink ray than Mabel had been, and in about a minute a miniature version of his sister stood next to the ruler. “How’s that?” she asked.
“Just between seven and eight inches,” he said.
“Close enough! Pick me up!”
“You sound so squeaky!” He gently closed his fingers around her. She felt like a warm, living doll in his grasp.
“Lay down, Dip! On your back. Hey, before I start, let’s try something. Lick my whole body!”
He held her still and lushed his tongue up her, toes to pussy to tummy to tits to face. “How’s that?”
She squirmed. “I love it! From now on we gotta give each other tongue baths! Put me down next to your cock and let me do my fairy magic!”
He couldn’t help laughing. As she had said about him, her voice was tiny and way treble. He carefully set her down on his pubis and then lay back. A moment later he felt a twinge. “Ouch! What was that?”
Something was tugging. Mabel grumbled, “I got one of your stupid pubes tangled around my toe! Let me sit down and I’ll take care of it!”
He raised his head. It was surreal. The tiny Mabel was sitting in the middle of his pubic hair, one leg bent, working at getting her toes free. “Oh, dammit! Mind if I just pluck this one?”
“Go ahead.” He heard her grunt, and then felt the little twinge as she pulled her toes—and one of his hairs—free. He watched her unwind it.
She stood up again and surveyed his erection. “This as big as you can get, Dipdop?”
He lay back, closed his eyes, and thought of Wendy’s whispered sexy conversations, of the lewd photos she had sent him, and he felt his penis throb. Mabel crowed, “That’s my bro! Mm, a big old tree full of spunk, just for little me!”
He felt her moving and then opened his eyes. She had wrapped arms and legs around his shaft and was shinnying herself up. “You still smell so much like pussy down here, brobro! Wow, I can barely reach all the way around this big old thing! And look at the purple helmet, so tight and shiny! I never noticed all these little bumpies and pits before. Uh—could you like sit up in bed, or lean forward so it isn’t so steep?”
Dipper got on all fours, more or less, until his erect dick was roughly horizontal to the mattress. “Perfect!” Mabel called, straddling and hugging his cock, creeping up on his shaft until she could lean way over and lick at his slit.
It felt curiously erotic, and she gripped harder with knees and arms as his dick pulsed. “Yum, lots of this super slippery salty pre-cum! I’m gonna see if I can get up here—now sit back, slow and carefully—yay, top of the world!” Now she sat straddling his glans, knees bent and gripping he ridge at its base. She was pressing her pussy against the very tip, gyrating her hips. “This must be the biggest cock any girl ever had! No way could I stretch far enough to get it inside!" She started to rock and grind. "I’m fucking you! Can you feel me, Dip?”
“Oh, yeah!”
“I can’t bend down and lick, but I’m gonna massage this cute slit for you.” He saw her and felt her, and then she cupped a hand and sucked the drops of liquid out of her palm. “Pre-cum’s good, but real cum’s tastier! Cum for your little sister, brobro!”
She wriggled her ass and squeezed him with her knees, and he thought of Wendy giving him a blowjob or better still, stretching open her pussy so he could fuck her—
“Mabel!” he yelled, arching his back.
“I gotcha, brobro! Shoot for—mlmph!”
Dipper saw the white jets hit his diminutive sister right in the face, then all over her body. He reached down to rescue her, but she clung tighter. When the first spasm had passed, at last she let go her hold and let him grasp her little body.
She coughed as he held her up and handed her a tissue. “Sorry, Sis!”
She used the tissue as if it were a sheet-sized towel. “Whoo! Got my fill of spunk that time! I still like the taste, but it’s not so great in my ears and nose and eyes—what are you doing?”
“I’m going to enlarge you again,” he said firmly, “and then you and I are going to take a shower!”
“Probably a good idea,” she said scooping stringy palmfuls of semen from her dripping tits and guzzling them with sounds like a soda straw sucking up the last drops in a glass.
He let her rinse off first in the sink—“Last thing we need,” he told her, “is a bunch of sperms the size of goldfish flopping around!”
Then he grew her back to her normal size, resisting her suggestion to give her DD tits just for fun, and they got in the shower, soaped each other up (they both washed their hair, too) and then rubbing each other off under the warm spray of water, enjoying showery water-orgasms. When Dipper came a second time, Mabel sadly said, “All that tasty jism down the drain!”
But he assured her, “There’s more where that came from.”
They toweled each other, dried their hair, and rested for an hour before Mabel announced she was hungry. “Want to go out for dinner?” Dipper asked.
“Um, let me think. No, putting on clothes is too much work. I kinda just want to laze around while you drive our new used truck into town and pick us up some burgers at Yumberjack.”
Dipper gave her a head-to-toe look. She was idly caressing a boob and rubbing her slit. “I will if you’ll put on some clothes.”
“Huh! And what if I don’t?”
“No burgers.”
She stuck her tongue out at him. “Compromise? I think gruncle Stan left a couple of his shirts in the office closet. Is it acceptable if I just wore one of those and nothing else?”
“Buttoned or unbuttoned?”
She rolled her eyes. “Buttoned if it makes you feel better!”
“At least that will let me concentrate on food,” he said.
She told him to buy her a Yumbo Jumbo with cheese and everything else but onions, an order of House Fries, and a medium Pitt’s. He dressed, retrieved the keys from where Mabel had dropped them on the gift-shop counter, and said, “I’ll be back in half an hour, Sis.”
“Fine! How do I look?” She modeled. Stan’s white shirt was huge on her.
“Like a little kid in her dad’s clothes,” he said.
“Call this little?” She raised the front of the shirt, flashing her pussy.
“I call it nice and juicy,” Dipper said. “Just like a burger! I’d better go.”
“Don’t let them put onions on yours, either,” Mabel warned from the door. “I don’t want an oniony mouth munching on me! And I have reliable information that if a guy eats onions and cums in your mouth, the cum tastes bad!”
“I’ll tell them to hold the onions.” Dipper got in the truck, Mabel closed the door, and then she ran upstairs for her phone. As she flung herself onto the shoved-together beds, she speed-dialed Wendy.
“Mabes!” Wendy said. “Are you two ready for Friday? ‘Cause I’ll be home like at nine that morning and I’m coming straight to the Shack!”
“Can’t wait!” Mabel said. “But maybe we can adjust your schedule. Let's talk. Um—Wen, do you remember those couple of times when we kinda got naked together and—fooled around?”
Wendy’s voice sounded guarded: “Oh, yeah, I remember that.”
“Okay, hear me out, please. Now I know you and Dip have the hots for each other, and I’m fine with that, but—can we have a little girl to girl talk? About what you’d like Dip to know and what he’d like you to know? And could we, um, sort of think about whether it’s strictly a game for two or if I might, um—”
“Fit in?” Wendy whispered. “Or if you and me might fool around with each other when we’re alone?”
“Yeah, that. Uh, both, really. Only there’s some news about Dip and me, and if it's okay with you and all, um, I’d really like to be in on it when you two are, you know . . . fucking.”
There was a long pause, and then Wendy said softly, “Let’s talk.”
***
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