You wake up incredibly horny

Over the course of the night, you're tormented by multiple wet dreams - each one successful in making you climax - but it just didn't stop and was never enough to fully satisfy you! Again and again you wake up halfway through a dream, quivering and drenched in your own juices, only to fall back asleep and repeat the process. By the time the sun rises and you're no longer able to return to your slumber, you feel like your crotch is soaked with your juices... but it still wasn't enough!

"Gosh.. Darn. It," you whisper grumpily at the realization that the night was over, but your torment wasn't. Of course you could masturbate again, but it would take ages to get yourself off by awkwardly rubbing your clit. Did Gwen perhaps have any toys you could use?

You quickly take off your underwear and, completely naked, begin searching through various drawers, storage boxes and whatever else you could find in Gwen's room. Nothing. You had hoped that she would at least have an electric toothbrush hidden under the bed or something...

"Damn you." You return your gaze to your sister, who had no idea how much you were suffering. Was it too much to ask for a slightly more perverted sibling?
However... you also notice a pretty massive bulge poking the bed covers from underneath. With a glance back up, you make sure that she's still soundly asleep before you dare pulling the covers off.

Cutely enough, she was wearing nothing more than a bra, and a tiny thong which struggled to contain her very visible morning rod. You decide to do her a favor by removing her undies and letting her small buddy stand right up in its veiny, early-morning glory. Her testicles looked particularly large, poor girl would probably be in pain if she doesn't get some relief for those!

Nearly as much pain as you currently feel with how horny you are... before you know it, you already climbed on top of her sleeping form, straddling her while her naked erection was pointing right up at your pussy. The idea of learning what it's like to have something inside of you was very appealing right now, especially knowing what it would feel like to have a dick inside you, as nature intended it to be. Yet, you hadn't even dared to push a finger into that dripping slot, would a cock really be a good first step?

That choice disappears when your sleeping sibling pulls the bed covers back up, and in the process, causes you fall forward to embrace her while her erect appendage plunged so deep into you that you could feel her girly testicles nudging against the soft lips of your cooch.
The stretching sensation, the sudden discomfort and the shock cause you to desperately gasp for air, eyes wide open, while your brain takes a second to comprehend what just happened!

It's only when you raise your upper body back up - and Gwen groans in disapproval still during her sleep at the familiar loss of her bed covers - that you've got a chance to look down and see your subtle slit **** wide open to accommodate your sister's dick! You certainly never imagined that having your cherry popped could be the result of a clumsy accident...

Still, since you've already gotten this far, you decide to test the waters a bit further and carefully drag your sweat-slick hips forward to get a better feeling for her man-meat... and it felt nice. There's no doubt that it only felt good because you were friggin' pumped full of hormones and your cunt was aching for a good fuck, but now that you had the opportunity, you sure as heck will make the best out of it!

Slowly and careful not to wake up your sis, you grind your crotch firmly against her, the exposed cockhead of hers giving lewd kissing to your tender cervix with every motion... it was an intense, intimate sensation that you couldn't compare to anything else you've ever experienced. It was special. No doubt... !

Your insides kept gradually shifting around that glorious appendage while you began grinding more firmly against her, remaining barely careful enough to not wake her with your actions. Sex was so friggin' good that you almost feel sorry for your sister... at this rate, she may never get to experience what it's like to get fucked as a fully fledged woman... to take a cock inside and have your body doing everything in its power to caress, massage and please that baby stick in every possible way.

Your heart was beating rapidly and you couldn't wipe your amused grin off your face - this was just too good! Every emotion filled your brain with a thousand uncontainable sparks, each one stronger than the last. It all became a little too much and you felt yourself going weak and numb, only to feel a faint tingle in your toes... rushing upwards in an instant and taking your breath away! Again and again the waves crushed over you, robbing you of all sensations besides pure bliss, while your cunt rapidly clenched down on your sister's veiny girl-cock! Pleasure, pleasure, pleasure!

By the time you come back to your senses, you're completely out of breath.

Glancing down, you luckily see Gwen still slumbering. One of the rare situations where it was good that she's always been a deep sleeper, that workaholic...

When you lift your bum off your sibling's crotch, you can hear an audible slurp as her now oddly flaccid dick flops out of you. What happened to her morning rod?

You're getting your answer upon seeing the first drop of white pearly cum dripping out of your snatch and onto her crotch. Another thick bead was already preparing to ooze out of you when you reflexively reach down and plunge a finger between your pussy lips to stop the flow! She came inside you! This is TERRIBLE!

But was it? Tits are awesome and you got to feel pleasures you could never even imagine as dude... maybe you didn't get the bad end of the deal? Not to mention you're a tad younger than you used to be, adding a decent chunk to your life span... you wriggle your finger a little deeper inside yourself, and feel a massive pool of Gwen's deposit around your fingertip. There was lots and lots of it, and it clearly wanted to get out. Probably millions of her tiny swimmers in there, each one as stubborn as she is.

But you can be just as stubborn. With tightly shut legs, you waddle to the bathroom and open the medicine cabinet to retrieve one of your mother's tampons. Your first urge was to just open your legs and shove it in there but then you realize you'd just spill semen everywhere, so you instead decide to bend over the sink while keeping your legs tightly shut and then reach around to slip the tampon inside from behind. Your pussy tightens around it, forming a perfect seal.

Secured the goods. Your smile grows a little wider - you're effectively holding Gwen's sperm hostage inside you. She would flip out if she knew...

... oh crap! You quickly rush back to her bedroom and use a towel to wipe away the remnants of sperm on her crotch, and the thick layer of pussy juices you left all over her manhood. Just in time too, since you barely manage to slide her thong back in place before she begins squirming more strongly and finally waking up.

She greets you with a loud, tired yawn while you gather your underwear to get dressed. With every step you take, you could feel the sheer mass of her gooey deposit sloshing around inside your tummy... as you look down... you can even see a small bulge on your belly. Hot!