Chapter 3
THE JOYS OF HORMONES-
Mabel awoke slowly with Dipper snoring lightly and directly into her ear. During their nap she had unconsciously rolled over onto her side so as to get comfortable, her brother having done the same in his sleep and wrapping his arms around his twin sister as he snuggled up close behind. The semi-lucid girl didn't mind the unexpected contact, however, and smiled sleepily while doing her best to get even closer to him, holding his arm to her bosom when she pushed her shoulders more into his chest. Thoughts of going back to sleep in that position were completely dashed, however, when a now wide-eyed Mabel felt a length of hard, warm flesh slip between her asscheeks, the nightshirt she wore having ridden up her legs & bottom during their nap and the newly discovered invader poking between the gap in her young thighs.
"Oooo!" she exclaimed in a high-pitched, girlish surprise as it brushed up under her panty covered mons pubis. Heavy realization hit the young lady like a slow moving freight train bearing down on her current situation with many jumbled, unyielding questions & thoughts mixing together, both racing through her head at a much faster cadence:
a) she was lying in bed with a boy that she had known her whole life, who always supported her and whom she'd shared more than a few near-death experiences with during their time away together in Oregon. The fact that the boy was her twin brother honestly didn't seem so gross to her nor did it feel wrong. "Just, y'know...kinda weird!" she half whispered to herself.
b) Having enjoyed the explicitly educational talks with Wendy Corduroy, her gal-pal & occasional mentor, Mabel understood that these things happen when you have men-folk in the house and remembered one instance when she herself had asked the older teen what exactly a 'boner' was. With four younger brothers and a hulking father-figure around her constantly, Wendy expertly explained the 'floppy junk' rule and how to not be overly offended when one rubs up against you by accident.
"It's just something that happens to boys, y'know? Dude-bods do their own thing and there ain't too much you can do to stop it. When any one of my little brothers sneak into bed with me, it's mostly because he's cold and wants some body heat, not because of some pervy desire to feel me up with their equipment. I used to climb into bed with my old man every other night after Mom passed away because it still smelled like her and, every once & a while, 'boi-oi-oi-oing!' There be it! His 'massive-daddy-issues' that I could see & feel the heat from, like, two rooms over! Heh heh! Personally, I think it freaked him out more when he woke up some mornings and I'd be wrapped around him, stealing both warmth & their combined scent. Well, sometimes 'Big Richard' just happened to be in the way. Never felt anything but appreciation that Pops would keep his sleeping area about as clean as I keep mine, just like Momma used to do, minus the flowery dryer-sheet aroma. Besides, I'm the only one who insists on washing all of my blankets every week. It's my thing...to them I'm a 'big sister slash space heater' with comforters that smell like jasmine & lilac!"
Mabel laughed at the example and then moved over to Wendy and, after motioning for her to stoop down a bit, gave the taller woman a hug.
"Your Mother woulda been proud at how you keep those boys & your Dad safe from the cold!" Mabel whispered through a smile with the hint of tears in her eyes.
As for her CURRENT concern, though...
c) it wasn't her fault that his dick flopped out from the fly of his boxers & gotten 'super-duper' hard with her there...was it? "And, what the heck, Dipper! Getting a stiffy for lil' 'ol me? Tsk! I mean I know girls develop faster than guys after puberty and I'm cute 'n all, but come on, bro, geez! And your junk! Was it always this freakin' big!?"
d) her not-so-hidden desire to be closer to her twin sibling was the reason that brought them here to his bed in the first place and she felt both safe and comfortable in his arms. He smelled good and made her skin tingle as he was hugging her from behind and the palm of his big hands rested right on her belly-
Mabel had suddenly gotten nervous & uncomfortable as an image flashed in her mind. She saw a taller version of herself, a very pretty teen hovering near seventeen or eighteen years old at her best guess, standing alone and very pregnant with a sad, lonely look on her face.
"I'm sorry, Dipper!" future Mabel said in whispered tones as her hands circled around the child growing inside her.
The image disappeared and even more questions leapt out of her, the predominant curiosity being-
"Th-that thing I just saw...where is Dipper? Oh my gosh...why am I apologizing to him?"
Suddenly, Mabel wanted to turn upon her twin brother and wake him, bombarding the sleeping boy with a great many questions in which she knew he couldn't possibly have the answers to provide. When she tried to wrest herself from his grasp, a dreaming Dipper spoke in half sentences as his snores rose and fell.
"Zzz...nuh-NO, don't leave me, zzz...Mabel...zzz...love you...snore...don't go...(deep inhale)...don'...go...zzz."
And with that, Mabel returned to her position prior to seeing her disturbing vision. This time however, the smile that decorated her face as she bit her lip and barely contained a stifled 'squeeeeeee!' would have given someone who had been selected to be the first person that just landed on Mars pause. It felt like every giddy muscle was doing it's job, and then some, as Mabel squeezed his arm even harder.
"He said he loves me-AHHH! Di-Dipper!?"
Mabel swallowed hard when the young man's penis flexed at his sister's movements in the single bed. Still asleep with his cock head touching her fabric covered clitoris, Dipper's physical actions both confused and excited his only sibling, sending what felt like an electric shock to her brain. He continued to snore away, oblivious to the position he was in; he had just unconsciously confessed his Love (?) for his sibling while she lay astride his engorged and throbbing sex organ. Being held in place by his arms and also her clear & very present lust, Mabel took the enormous risk of waking her brother from his slumber by reaching down between her legs and moving her panties clear of his skin.
Wet flesh touched hard flesh making Mabel bite her fist. The female twin wanted so much more of this brand new feeling that she found the smallest pinhole in her underwear and pulled with her fingers until, within moments, the worn and threadbare garment was torn and in tatters. Doing so had the advantage of leaving her left thigh smooth and her newly naked bottom totally exposed. Hooking her right ankle under that of her brother's right leg and raising her left knee skyward, the path to her womanhood was clear and unobstructed. Mabel, being one for taking chances, pressed her pussy down atop her brother's straining member. She then began to slowly rock from her pelvis back & forth, turning herself on more with each rasp of her blood swollen clitoris. A bit of dirty talk only emboldened her actions as she spoke in light whispers to Dipper, stopping only to ensure that he was still asleep and resuming when she was convinced that he was.
"Y'like that? Huh, Dipper? Ummmf! Y'like that sister booty, don'cha? Mmmmuhh...nothing like this from Wendy or Pacifica or Candy or...or Grenda! Yeah, you like 'em big, don'cha? Ssssssfuhhhhh...but I'M the one who gotcha! C'mon, hump me like you mean it! Yuh-you're MY DippyOhmygoshthisfeelssogooood!"
Mabel held his hot, hard cock close to her spasming clit as she experienced her very first orgasm, huffing and finished off her high with a few quick strokes across her tingling, sensitive pussy. Continuing to use his length as a riding bar, she wondered why she'd never experienced this feeling before or how guys could sleep through something that felt so great! Maybe it felt different for them since they didn't have vaginas?
Huh.
A question for another day as a satisfied but exhausted Mabel Pines wiped the light sheen of nervous sweat from her brow, and then her girlie bits with the same torn tatters of her shredded undergarments. For some reason, she held the destroyed panties tightly in a death-grip within her right hand, electing not to toss them into the nearby rubbish can. She fell asleep with Dipper's arms wrapped around her torso, his light snoring hinting that she should join him in the late morning siesta & his thick, throbbing penis welcomely trapped safely between her warm, soft, closed thighs.