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Smells Like Teen Spurts	By : Nastyzak Category: +G through L > Gravity Falls Views: 15483 -:- Recommendations : 0 -:- Currently Reading : 1
Disclaimer: I don't own Gravity Falls or the characters, and I don't make any money from writing.

Chapter List
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20. Behind My Back
1
On Saturday morning Dipper got out of bed while Wendy still lay asleep. He stepped out onto the front porch of the vacation cottage and took a deep breath of the cool Pacific air. It was probably in the mid-sixty degrees, warm for that area, but fairly chilly since he was wearing gray running pants and a thin, long-sleeved pullover shirt.
It was that time of day when the breezes off the land had stopped and the ones from the ocean had not revved up, but it would probably be windy later on. Dipper leaned on the porch rail. A few hundred feet away the Pacific rolled in, gray-blue and breaking into white-foamed waves as it met the three rocks called the Pyramids, dashing into spray at their bases. Further out to the west, the horizon was lost in a pale haze.
The sky was a faded pastel blue, with a high layer of cloud. The pebbly, stone-strewn beach below stretched empty except for a few gray and white Western gulls. Somewhere way behind him the sun was coming up. He heard the sliding door open and looked over his shoulder. “Morning, Wen.”
She was wearing a green flannel shirt, jeans, and sandals. She came behind him and hugged him, laying her cheek against the back of his neck. “Morning, lover. Little bit cold out here. Wait a minute.” She went inside and came back with a thick blanket. “Let’s sit here and watch the ocean for a few minutes.”
A pair of extra-wide and extra-sturdy porch chairs stood against the wall to the left of the doors. She sat in one and when he started for the other, she said, “Uh-uh. In my lap.”
“I’m kinda heavy for that,” he said.
She chuckled. “Dude, I cut down trees with an ax for fun! I think I can handle your weight.”
It felt odd, but he sat on her lap as she pulled the blanket around both of them and asked, “Comfy?”
“Yeah, this is . . . sort of nice,” Dipper said. “Uh—what are you doing?”
She had reached around him and her cool hands had slipped into the waistband of his jogging pants. “I’m a lumberjill,” she said. “It’s my job to search for wood. And I just found it! Raise your butt up a second. There we go.” She shoved his pants partway down. In fact, halfway to his knees. Now she put both her hands on his dick and started to stroke very gently. “Do you like this?”
“A lot,” he said. “But I feel weird, sitting on your lap while you’re fapping me.”
“You know,” she said, “if I had a dick, I think I’d jerk off like six times a day. What does it feel like, having this big thing between your legs?”
He found that difficult to answer. “Uh, you know, most of the time a guy doesn’t notice it. I mean, it’s there, but usually you don’t particularly feel it. Unless, uh, I guess you’re horny. Or peeing.”
Now Wendy was using just one hand, not seriously jerking him off yet but keeping him stiff. She said, “When I imagine it, I think it would be like a weight bobbing around down there. Kinda floppy. Until it gets excited, like yours is getting right now.”
“You know what?” Dipper blurted. “I’ve got a way to show you what it feels like.”
“Really?” she asked in a teasing way. “Dude, would you like me like that? With a dick on me?”
“No, but—wait, what? You're taking this seriously? Do you think I could really do it?”
She put her palm over the crown of his dick for a moment. “You’re leaking a little. Do I think you could give me a dick? Man, I grew up in Gravity Falls. Nothing seems weird to me. So exactly how would you hang a dick on me? Mind, I wouldn't like it if you couldn't take it off again. I think I like ‘em IN me better than I would ON me.”
“Okay, this sounds even crazier than usual, but did I ever tell you about the electron carpet? I know I did. Remember that time when you thought Soos had gone nuts and he was eating paper and junk?”
“Yeah,” Wendy said. “Layin' on the counter and eating, like, tissues out of a box, freaky. Later you and Mabel told me it was because Soos and Waddles had changed places or some biz.”
“The way it works,” Dipper said, “is that two people stand on this electron carpet, shuffle their feet around, and touch hands. That causes an exchange of elctrons. I mean the carpet zaps them so that they trade bodies. Like for a while I was in Mabel’s body and she was in mine. And I know where gruncle Stanley hid the carpet. So when we get back to the Falls, if you really want to try it, you and me could pick it up at the Shack and use it to swap bodies, so you would be in my body, I mean your mind would, and mine would occupy yours. And then you’d, uh—no, forget it, it’s too weird.”
“You know when you talk nerd-talk, your dick starts to go soft. And here I am wanting it all hard and stiff. Is that carpet deal true, Dip?”
“Yeah. And to change back, you just do the same thing again—shuffle your feet and touch each other. You know how in dry weather you can do that on a carpet and get a static electricity spark?”
“Oh, yeah. Sometimes getting out of a car in cold weather when you slide your butt across the car seat. This sounds kinda bizzaro. Huh. So if I was you, and you were me, would you let me fuck you?”
“Uh.” Dipper squirmed. “I hadn’t thought about that. But, yeah, I guess that would be fair. I mean, it would be your, you know, pussy, but I’d be in your body and feel what you always feel when we do it. And you could see what it’s like to have a penis and, um, cum and all.”
“That's one way for me to find out how it feels. Kinda . . . naughty. But that's not new for us! Let’s try it next weekend,” she said. “You’re excited too, right? ‘Cause all of the sudden your dick’s all swollen up.”
“Yeah, but you had something to do about that,” Dipper said. “Your finger’s on the spot called the frenulum, and it’s way sensitive. Don’t stop, though. Want to go inside and make love?”
Wendy squeezed him. “Can we compromise? Go inside and fuck?”
Dipper laughed. “We can do that!”
“Damn, if it wasn’t so cool, I’d say do it right here. Switch places, let me sit on top of you, and go at it. Or you want to try that under the blanket?”
“I’m game if you are.”
“Get off me then.”
Dipper hitched up his pants and they changed places. Wendy held up the blanket and he pushed his jogging pants way down again before he sat down. He held the blanket while she kicked off her sandals, crouched, and then stripped from the waist down, stepped out of her underwear and jeans, and sat down, snuggling against him. “Hey, your dick’s in my crack like a great big hot dog in a bun!" She playfully squeezed with her butt cheeks. "Feels interesting. Be a nice guy and finger me a little, get me good and wet.”
Beneath the blanket that covered them both, Dipper reached around to slip his right hand down over her stomach to her crotch and Wendy opened for him. He felt her trimmed red bush and below that her wet pussy lips. He started to stroke and tease tenderly, lightly. “Feels like you're interested." He sped up. "How’s that?”
“Nice. But just a second.” She took his wrist and pulled his hand up to her face. Then she sucked his middle and index fingers, working them over with her tongue.
He tightened up. “Um, that’s—”
She laughed. “It’s sure getting you real hard! But now your fingers are wet, so get back to the job of warming me up down there. You’re good at this, you know. I mean, I’ve dated like a dozen guys who got this far with me, and none of them had the patience or the soft touch to find that little spot right up there just beneath my clit. Yeahhh, that one! Mm, sort of like that place on the underside of your dick you mentioned. You’ve got a nice touch, man. Now I’m dripping. Hold your dick steady for me.”
He did, she rose, sank again with a circling motion of her hips, and his dick slipped smoothly into her snug pussy. She wriggled. “Balls deep, man, just the way I like it. Rock me.”
The chair wasn’t really a rocking chair, but in it he moved enough to make Wendy sigh with pleasure. “I’m looking forward to this evening,” she said softly. “When you fuck my ass again.”
“Are you sure?” he asked as he reached under her shirt, caressing her breasts and tugging at her erect nipples.
“Yeah, it’s different, but I could get used to it. I've been thinking about it. What I’d like to do is have that egg vibrator inside my pussy, the toy with the remote. Once you get inside my butt and we start doin’ it, I want you to turn on the vibrator and make me beg for more until we both cum our brains out. Speaking of which—you’re already getting close, aren’t you?”
“Pretty close,” he admitted.
“Feel you twitching a little. Nobody’s anywhere around who could see us,” Wendy said. “What the hell.” She started vigorously rising and plunging down again. Even with the blanket coveirng them, anyone seeing them would know what they were doing.
After a vigorous series of thrusts, Wendy squealed and tightened. “Shoot it in me!” she said. “This just gets better and—aw, yeah!”
The hot flood of cum shot hot from his dick. Wendy collapsed back and gasped for a minute. Then she said, “I love how warm it is when it spurts into me! Damn shame to waste the cum, but it felt great! Let’s go inside.” She stood up, wearing the blanket like a robe, with one hand clamped against her pussy. “Open the door for me, please.”
He tugged up his jogging pants and followed her, admiring her great ass, bare through the gap in the fabric she had draped around her shoulders. Just inside the door she dropped the blanket and moved her hand to allow her pussy to drain his pearly cum into her palm. She sucked it up with a dazed, sensuous expression in her eyes. “Fuck, man, I’m totally addicted to this!”
“I might have a little more left,” Dipper said.
“Drop your pants and let me at it!”
She knelt and did the now-ritual cleaning, licking his dick and sucking the last oozes of cum from his urethra. “I think we spilled some outside on the chair,” he said.
“We can clean it up. Paper towels are in the kitchen.” She rubbed his now softening dick against her cheek and planted a final kiss on the tip before standing to face him. She put both forearms over his shoulders and gazed lovingly at his face. “Dip, straight up, are you serious about that carpet deal? We can really trade so I can try out your dick and you can try out my pussy?”
“It’s true,” he said.
"And you're sure we can cange back?"
"No problem iwth that."
“Hm. Then if you were in my body and I was in yours, you’d really let me put my dick inside you?”
Dipper shrugged. “Yeah. I mean—it would be my dick, technically, and your pussy, but the feeling would be something new for both of us. I mean, I already do it with you, so I guess the reverse is just fair play.”
Her green eyes twinkled. “Would you suck me off like I do you?”
He hadn’t thought about that. “I—I’d try, I guess,” he said. "It seems weird to think about it, but I love it when you do it for me."
"Main thing is that you have to keep yourself from gagging. And swallow the cum."
"I'll do my best if that's what you want."
“Then let's try it next Saturday if we can sneak the rug out of the Shack without Soos asking questions. Right now, come to bed again,” she said. “I want you to eat me out.”
“Are you that horny?” he asked.
“No, but I want you to get used to the taste of your cum, and I’m still dripping a little. And I’m sorry, I know you can’t get hard again right away, but with a little of your tongue work I think I can cum again!”
“Let’s try it,” he said.
“Oh, man,” Wendy said as she lay back on the bed and ruffled his hair as he went down on her. “I never had a guy like you. Dipper, I fuckin’ love you!”

2
Mabel whimpered. “Ow! That’s too TIGHT!”
Pacifica smacked her butt with a miniature riding crop, leaving a pink stripe, not a serious one. “Shut up. You’re a pony now.” She continued to press the butt plug, which ended in a horsetail-like plume of rainbow colored hair, into Mabel’s ass. “Stop that! Don’t push it back out! Relax. It'll stop and hold when it's in far enough. There, it’s going in just fine.”
“It's stretching me and it hurts!” Mabel, who was naked and on all fours, complained.
“You’ll get used to it. There. It’s in. See, nothing to it. Now you've got a pretty pony tail.” Pacifica moved around and stood in front of Mabel. She was also nude. She cupped her hand beneath Mabel’s chin and pulled her head up. “You’re going to be a good pony, aren’t you?”
“Yes,” Mabel murmured.
Smack! Pacifica had stretched her arm over Mabel's back and The riding crop struck her ass again, and the pink stripe became a pin X. “Say it right!”
“Yes, Miss Pacifica,” Mabel said humbly.
Pacifica gave her a smug smile. “Good pony. All right. Now I’m going to brush you down. Ponies like to be brushed.”
Mabel grimaced but didn’t say anything. She had already spent half an hour with a bit between her teeth and a bridle over her head, creeping on hands and knees and being led in a circle around and around the playroom, and she didn’t want to have to chomp down on that bit again. When she saw Pacifica go over to some shelves and return with two long-bristled yellow brushes, she winced, imagining how scratchy those things were going to be on her bare skin.
“Easy, girl, easy,” Pacifica said, starting to brush Mabel’s back.
“That . . . feels good! Miss Pacifica,” Mabel said, hastily adding the last two words. She relaxed. The bristles weren’t stiff at all, but luxuriously soft, and Pacifica first ran them over her neck and shoulders, and then with long, slow, sensuous strokes down her back and over the twin swells of her butt. It was strangely stimulating.
“Ponies like brushes,” Pacifica said. “Now let’s take care of these."
She brushed down the side of Mabel’s left breast, then concentrated on the nipples. Mabel moaned a little.
“Ponies don’t do that, they whinny,” Pacifica said mildly.
“Uh. Ruhurururu,” Mabel said, doing her best.
“That’s good. Very clean and pretty now. I want to do the other side. Turn around.”
“Yes, Miss Pacifica.” Mabel turned, but her arms were getting tired and her knees were starting to ache. Pacifica worked on her right breast. Now both of her boobs tingled, and both her nipples were stiff.
“Now down your tummy,” Pacifica said, reaching beneath her and brushing from tits to crotch. The sensation of the soft brush gliding over her belly, moving in circles around her navel, and then down to her pubic brush made Mabel tremble.
“Got to do your tail and legs,” Pacifica said. “Turn, girl. Gonna make that tail sleek and shiny.”
Mabel moved around and Pacifica began to brush the tail, which tugged on the butt plug. The sensation made her think she was about to go crazy. Crazy-er.
The brush tapped the inside of Mabel's thighs. “Move your hind legs apart.”
Ooh, now Pacifica teased her inner thighs. Do my pussy, Mabel thought. Brush my pussy! I’d come right now if you did that!
But . . . Pacifica put the brushes away. Mabel was erotically aching all over, especially down there.
When Pacifica returned, she was wearing a black harness and a sizable strap-on furiously pink dildo that looked as though it had been molded from a real rampant penis. “Ready to be mounted, pony?” she asked.
“Yes, please, Miss Pacifica!” Mabel said.
“Here it comes. Steady, girl, steady. There!”
Mabel lurched as the dildo entered her pussy—not gently, not a little at a time, but with one quick shove. Pacifica gripped her hips and started to fuck her. “Do you like this?”
“Uh—ruhurururu.”
Pacifica patted her right butt cheek. The pink marks were fading rapidly. “You’re getting the idea. Okay, enough walking. Now we’re going to canter.”
Increasing the speed of her thrusts, Pacifica started to smack against Mabel’s ass. She had pulled the tail up and to one side. All of it started to feel really, really good to Mabel. Her neck arched and she clenched her teeth. Her face and tits felt hot, and probably, she thought, were as red as a cooked lobster. She felt a fine perspiration break out, the kind that the Internet sex sites sometimes called "girl grease."
“Good girl!” Pacifica said. “Work up a nice sweat. Now—gallop!”
"Oh, Gawd!" Now the dildo was POUNDING her, and Mabel knew that she couldn’t last long. She couldn’t stop moaning.
Then Pacifica pulled the butt plug out an inch or two and jammed it back again. In and out, as she fucked Mabel’s pussy.
It was too much, and Mabel screamed as she had a gushing climax that loosened her muscles. She lurched forward and collapsed on her stomach, lying there gasping for breath, her cheek against the carpet. Pacifica yanked the pony tail and the plug popped out. “Mabel,” Pacifica said, “shame on you. You’re wide open.”
“Uh. Th-thank you, Miss Pacifica.”
“You’re not finished,” the other girl said. “Well. I mean YOU may be finished, but I’m not. Roll over.”
Mabel did, and she saw that Pacifica had unfastened the harness and had worked it off the dildo, but the hot pink toy still was inside Paz's pussy and jutted up at a lewd, bobbing angle. It was double-ended—the nine-inch-long fake penis outside, and inside Pacifica, a thicker, curved plug that reached far enough to stimulate the g-spot. Pacifica almost casually pulled it out of her vagina. She lay down next to Mabel. “Now you have to do me,” she said. “Here. This just came out of me. Show me that you want it.”
She held the stubbier, thicker branch of the double-headed dildo to Mabel’s lips. Mabel understood and started to lick it. It was still warm and tangy with the blonde girl’s juices. Smiling, Mabel grasped the dick side in her hand and sucked the pussy plug into her mouth.
“Do you realize how goofy you look, with that in your mouth and a dick sticking out from between your lips?” Pacifica asked.
Mabel shook her head, bobbing the dildo side to side.
“All right,” Pacifica said, taking hold of the shaft. “Give it back. Now then this plug part goes inside you. Open up a little! I know you’ve used vibrators before, you know how this goes.”
“Pa—I mean Miss Pacifica, I’m still so sensitive down there!”
“Then you ought to like it. Don’t wriggle! It goes . . . right . . . in. Nice and snug, right?”
It was already pressing her g spot. “Omigod, yes!”
“Hold on to it and stand up. Wait, I’ll help you.” Pacifica stood and then gave her a hand up. Mabel’s knees were still sore from pony time. “Now stay still and I’ll show you how to fasten the harness. It has to be tight.”
She soon had the harness, a lot like a black leather panty, fastened. “Is your butt very sore?” she asked Mabel, patting her ass.
“Uh, sort of. A little. Not much,” Mabel said, surprised because Pacifica was embracing her, her incredibly blue eyes locked on hers. She felt the dildo press back against her lower stomach as Pacifica’s hands on her butt pulled her close.
“You’ll get used to it.” Pacifica smiled and reached up to brush Mabel’s hair back from her eyes. “Don’t you want to hug me?”
“Can I, Miss Pacifica?”
“Yes. You’re not a pony now.”
Mabel put her hands on Paz’s firm round ass. Ever since her last trip to Gravity Falls, she had been making love with her new roommate, but—well, it was mainly the old sixty-nine, with some fingering and a couple of vibes thrown in for spice now and then. She really wasn’t used to standing pressed against another buxom girl, their pliant tits flattening against each other. Pacifica came in for a lingering kiss. “Mm,” she said, drawing back at last with a dreamy smile. She licked her lips. “I taste me!”
“You taste good,” Mabel said.
“All right. It’s okay to fuck a pony on the floor, but I want you to do me on my bed. Come on.”
Well, at least there was no bit and bridle this time. With their arms against each other's waist, they went to Pacifica’s sunny bedroom. Pacifica leaned forward, putting her torso on the bed, and moved her feet far apart. “Doggy style,” she said. “There’s lube on the night stand. Use plenty of it on the dildo, and rub some on my pussy, too. Yeah, good, get your fingers in there. Now put the dildo inside my pussy, nice and slow. Nice, nice. You’re getting the hang of it. How’s it feel to you?”
“Good,” Mabel said breathlessly. “I'm leaking milk again! I love the dildo. It stuffs me and it feels sooo good!”
“If you make me cum good enough, I’ll let you wear the vibrating one next.”
“Ooh!”
“Start to fuck me. Not that hard at first! Look, I’ll count the beat. One and two and three and four . . . that’s right, that’s right, it’s like being a good dancer. After this, we’ll shower that sweat off you and have brunch. I’m in the mood for a smoothie. You?”
Mabel groaned, “Gawd, yes!”
“Yeah, your brother’s cum is so goddam sexy! Now faster.” Pacifica was cupping her own boobs, kneading them. “Yeah, little milk here, too, I’m getting there . . . put a finger in my ass now. Lube! Lube . . . yeah. Press down with that finger. Can—can you feel the dildo moving inside me?” Pacifica squeezed Mabel’s finger with her rectum.
“Yeah, so sexy!” Mabel said. “Is it okay if I cum again, Miss Pacifica?”
“Y-yeah. You know if you don’t—mmyeah!—want a smoothie—we can just melt some cubes and heat it up and drink it straight out of oh FUUUUUCK!”
“Yah-hah!” Mabel yelped, pushing hard against Pacifica’s butt. She felt a hot liquid gush against her upper thighs and couldn't tell if it came from Paz or her or both.
“Pull out now, pull out,” Pacifica said. As soon as Mabel did, the other girl spun around and sat on the edge of her bed, holding her hands beneath her tits. “Look, milk! Hey, you, too!”
“Not much,” Mabel said, Her nipples were only trickling a few drops, Paz’s were like gorgeous twin fountains. “Can I drink—mm!”
Pacifica pulled her in and guided her so she suckled the sweet hot milk. “Tam and Wen and I nearly stopped lactating, but we kept sipping Dipper's cum and each other's little drops, and now we're going strong again. Suck harder!"
Mabel redoubled her efforts, giving Paz an orgasm.
Pacifica murmured, "This feels so fucking nice! I think you’ll give more milk as you get used to doing this,” Pacifica said. “I like the way you're doing it, you’re good at t his. Now the other one. Lick my nipple first. There, it's ready. Pull it in between your lips and use your tongue. Aw, that’s feels so good! I think I'm done. Let me suck yours now!”
“Sorry there’s not much,” Mabel said.
“That’s okay. Mm.”
With Mabel kneeling at the edge of the bed and Pacifica leaning out, Paz lapped and sucked and Mabel said, “That does feel good! They’re so tingly! They didn’t use to be this tingly!”
“That’s something else,” Paz said, sitting on the bed and wiping her lips. “We found out that between the milk and Dipper’s spunk we girls get a hell of a lot more sensitive everywhere, pussy and ass and tits and all. Okay, good, unfasten that and take the dildo out and then let’s just lie here for a while and cuddle.”
“I love to cuddle. Eileen and I go to sleep hugging each other every night," Mabel said as they lay in bed and snuggled, running their hands over each other's body. Mabel whispered hopefully, “Can I really give Dipper a blowjob? Can I, you know, fuck him? Will he even do that?”
“I’m working on a way,” Pacifica said, studying her face. “God, you two still look so much alike!”
“Yeah, it’s a blessing and a curse,” Mabel said with a giggle. Paz was half-smiling at her, their faces only inches apart. Mabel kissed her. Pacifica put her tongue in Mabel’s mouth. And before long, they weren’t mistress and pony any longer at all, but two lusty girls just having fun.
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Smells Like Teen Spurts