Before you read, this chapter involves body switching, and so, I will refer to Dipper in Mabel's body as 'Dipper' and Mabel in Dippers body as 'Mabel'. Basically I'm referring to the mind, not the body.
Dipper POV
It's been almost a week since me and Mabel had done anything, and today I'm just sitting on my bed, crossed-legged, browsing on my laptop. I glance up from my research to find Mabel laying on her back, knitting a sweater. I briefly think back to the days of your youth when I would see her do exactly that. Suddenly, I had an idea of something fun to do. Something I had always wondered about, but was too afraid to voice my thoughts about.
"Mabel?" I ask.
"Ya bro?" she replies, putting down her sweater, and sitting up.
"Do remember that time, before we defeated Bill, when we were fighting over that spare room that turned out to be Ford's?"
"Umm..." Mabel thinks for a few seconds, scrunching up her brow, "Oh yeah! I remember. What about it?"
"Well, remember that body switching carpet that I got rid of?" I say, motioning my hand behind me.
"What about it?" Mabel replies, "You're not thinking what I think you're thinking, are you?"
"I think I'm thinking what you think I'm thinking, I think." I jokingly say, "I should try to see if I can track it down, you know, for science."
Mabel gives me a 'Oh come on' smirk, "Just admit it, you want to be a girl."
"No no," I say in a high pitched voice, "I just thought it would be fun to switch bodies again for a little bit."
"Well, I guess we could. And since we're older, it'll be more fun this time." Mabel says.
She hops off her bed and drops herself next to me, to watch me search 'Body switching carpet Gravity Falls' into the search bar.
"Well," I start, looking at the results, "it seems that there's one for sale at the..." I click on the first result and look at the address, "McGucket Mansion?!" I pause and stare at the wall, trying to think of an explanation. "Oh that's right! Remember how Old Man McGucket bought Pacifica's old mansion after they had to move out?"
"Oh yeah!" Mabel exclaims in realisation, "I totally forgot about Pacifica..." She trails off in her thoughts, as I take down the phone number. I then pick up the phone we have in our bedroom, and punch in the number, and, pressing call, I listen for the ring.
"Howdy doo!" I hear the crazy hill-billy shout though the line.
"Uh, hi Fiddleford. It's me, Dipper Pines?"
"Ah yes, I remember you." He says in his signature un-pleasant voice.
"I was wondering if you still have that carpet for sale?" I ask.
"Yes sir-ree! I got it right here. You folks wanna come pick it up?" he replies.
"Yes please, we'll be right there."
Mabel and I steal the keys for the golf cart and drive out to the formerly known, Northwest Mansion, now renamed McGucket Mansion, where we find Fiddleford playing with some contraption on his lawn. After a bit of small talk, he tells us that he first found the carpet in a dumpster, but kept it, because he remembered Ford talking about tit at some point. He then sells us the carpet, and cheep too. I notice Mabel's startling silence. Usually she's be babbling away at whoever she meets, but being here really put her off. I better talk to her later about that. I think, leaving a mental note.
Back at the Shack, we sneak the carpet back inside, but not before getting caught by Grunkle Stan.
"Hey kids!" he greets us, "What you got there behind you back?"
"Uh, just a carpet, nothing special, nope, nothing special at all, hahaha..." Mabel awkwardly replies. She's not a very good liar. Stan just stares at us, seeing if we'll crack, but we hold firm.
"Eh, as long as it won't kill you, it's fine by me." he shrugs us off and wonders into the gift shop. This gives us the chance to rush upstairs, and lock the attic door. I take the carpet from Mabel and roll it out on the floor. We just stare at it.
"Well, here it is Mabel." I say, not taking my eyes of the carpet, "The body switcher. Experiment 78, electron carpet."
"Come on Dipper! I want to know what it's like to have man parts!" Mabel proclaims. I can't help but laugh a little at her lack of shame.
"Alright. Here we go." I take off my shoes and start rubbing my socks around the carpet to build up static electricity. Eventually, I feel a warm buzz in my feet, and motion for Mabel to stand next to me.
"You ready?" I ask her one final time.
"Yes." she says as she leans in for a kiss. Out lips touch, and electricity passes through our bodies, creating a large flash, and a weird, un-natural feeling. Everything goes black for a few seconds before I become aware that I'm on the ground. I groan and open my eyes, and stare down at my body. I find myself wearing Mabel's sweater and skirt, along with two big breasts. I quickly stand up, the familiar feeling of disconnection coming back to me from the last time we did this.
"Dipper?" I hear Mabel say. I turn to her, only to find myself staring back at me.
"It worked!" I happily declare, my voice coming out of my sisters body. I feel my new breasts, and they feel just like they did that first time in the shower, but this time, I can feel the pleasure of them being squeezed. Mabel sees this and gives me a sly look with my face.
"Enjoying feeling your sister up, are you?" she says, hands on her hips.
"Hey, they're mine now." I say, "At least you don't have your braces anymore. They were really annoying."
"Ugh, tell me about it." Mabel says, watching me still squeezing my chest. Just then I notice Mabel's shorts start to bulge.
"Hey, what's going on?" Mabel asks as she looks down to the obviously unfamiliar feel. "Ohh... now I have an erection."
"SHH! Mabel! Not so loud." I quietly shout at her. Now that we're in each other's bodies, I don't want us to get caught. Mabel replies by pushing me onto my bed, sending me onto my back.
"Now, I can finally see what it's like to be on this end." she says with a evil smirk. I gulp. She pushes my skirt up and removes my panties. Oh gosh, removing 'my' panties? Never thought I'd think that. She does so with ease, and stares down at my entrance.
"How's this?" she asks as she starts tenderly rubbing my new entrance. I give out a small moan of pleasure. It's a totally different feeling than anything I'd known before. Being a girl in this scenario was a very surreal experience, and it had only just begun.
Mabel starts to push her fingers into my hole, making me quiver. I grab hold of my right breast and start squeezing it again, to calm me down. But she soon stops, and I look up to see why. I then see her pulling her new manhood out of my boxers and feeling it.
"Mmm, so this is what you feel, huh?" she asks, rubbing herself. I sit up, and Mabel asks me to rub her down. I do so, finding it very strange to be giving my old body pleasure, but with Mabel's voice moaning in satisfaction. Mabel then soon flips me back over and pulls my skirt up.
"Mabel, I know what you're going to do, and we need a condom." I tell her.
"But I don't have one." she says with big puppy dog eyes. But I know that we need one if we don't want Mabel to get pregnant. Or, for me to get pregnant. That would be very hard to explain to mom and dad.
"Well, there is somewhere else you can put it..." I say. Mabel sees me move onto my stomach and push my butt a little in the air. She gets the signal and puts her hard rod against my cheeks. Another first for Dipper Pines I think to myself as she pushes her way into my hole.
The feeling is so dramatic that I quietly scream. Mabel does the same, but with a more manly grunt. We go at it for a while, periodically exchanging 'Yes's and 'Oh's. Eventually we're left laying on our backs, puffing, Mabel feeling up my bare chest, me stroking her rod.
"So, how was that?" I ask her, "What was it like being the man this time?"
She just replies with a passionate kiss, rubbing up against my side.
"I loved it. But, uh, Dipper?" she asks worryingly.
"Yeah Mabs?" I coyly reply.
"We better switch back now."
"Oh yeah."
Okay, there's another addition to the Dipper and Mabel saga. Please, if you want this body switching idea to be carried on, like, if some drama happens while they're in each other's bodies, let me know. But if not, give me suggestions. I'd love to hear any input you guys have. Anyways, thanks for reading!