Some post-sex smooching

"Ouch, ouch, ouch!!" you wince and cry out with every tiniest movement. Gwen's stupid knot was stretching you open painfully! It was made worse by the fact that it's trapped JUST behind the tight seal of your pussy lips -- almost outside, but not quite. It was a thick presence that was hard to ignore and no amount of squirming allowed it to break free... your sister really screwed you over! Just WHY did she have to try and push it all into you!

Something that hadn't even occurred to you was another aspect of her enhanced genitals. For a normal human, it's expected to ejaculate 20 million, maybe even 50 million sperm on a good day upon climaxing. A man's best friend though? Dogs easily ejaculate 500 million and up to a billion of those wriggly little tadpoles, and right now every single one contained plenty of Gwenny's precious DNA. A single creampie from her contained as much sperm as what a normal guy can produce after a total of 20-50 ejaculations. It's the shotgun approach of breeding - you don't even need to aim correctly with numbers like that.

And she succeeded in depositing every last drop inside your unwilling teenage bits.

It's not like that was her goal, of course. She simply wanted to bareback your cunt and see what it's like to squirt a healthy load of cum into a slut. There's so many guys who brag about having sex without a condom that she just couldn't resist the temptation of experiencing it for herself. And she liked it...

Still stuck on all fours as you are and intimately tied to her, it doesn't take long for you to hear the soft, pleased giggling that escaped her lips. "Man, if I had known that guys have this much fun, I would've wished to have a dick much earlier! Surely you can understand where I'm coming from?" Wait, does she KNOW that you used to be a man? "I mean, I don't know about you, but masturbating as a girl isn't always fun. Gotta get into the mood first, then tease your pussy or your tits, eventually move on to the clit, then optionally find something nice to stuff your pussy with while continuing to pay attention to your clit. It's like a stupid mini-game. Of course we girls are amazing at multitasking compared to boys -- we literally gotta do a crap-ton of multitasking just to have an orgasm, am I right?" Uh, so that's what she meant. About how difficult it is for girls to climax? You can't really relate to that speech... or can you? So far, you didn't even manage to have a single female climax... man, what a useless body... Your sister continues her rant. "A cock though? Back and forth and it's ready to blow. Doesn't matter if I fuck my hand or a pussy, just gotta offer a bit of stimulation and that thing is good to burst. Aren't guys also the ones who cry about premature ejaculations? As a girl, I'd LOVE to have that problem. Imagine touching your clit and you're already good to explode into wonderland? Nice... not like I gotta worry about that anymore, I guess." Jesus, is she done talking yet!?

"Hey I don't wanna interrupt you or anything, but I'm still kind of in a rush? Can you pull that thing out yet?" You shake your rear to emphasize the important area and she glances down to see your puffy folds still stretched TAUT around her knot. Her deposit of a billion tiny Gwens was still swirling around inside your loins as a gooey mass of translucent girl-cum, which pooled somewhere in the far back of your tiny vagina. So friggin' gross, you sure as hell don't want to be stuck in this body! The idea that you've got someone else's bodily fluids inside you is just... absurd, right? It's like a mini pregnancy, since even if you aren't literally pregnant, you still have to share your body with those tiny sperm cells... or is that thought too ridiculous? Nope! This isn't what you signed up for! "Well what's up? Just tug on it or something? Pull it out! It can't be THAT difficult!" And yet, as soon as she begins moving again, you are the first one to cry out bitterly. It's a sharp ache right there in your crotch, as if you're getting torn open whenever she attempts to withdraw...

... the door suddenly swings open, and you glance over to the side with widely opened eyes just in time to see your mother standing in the doorway!! She held a tray with cookies and a glass of water, but that seemed pretty insignificant right now. An amused expression rests on her face as she takes in the sight in front of her. A towel helped to hide your breasts, but your genitals were in full view -- including the way your sister's dick was buried balls-deep inside you! Maybe you should've gone to a hotel after all, god damn it... a burning blush creeps across your cheeks while your mom takes another moment to admire the view. She seemed to be contemplating what to say, given the... delicate situation. After another delay, she simply approaches the bedside and gives Gwen a reassuring pat on the back? Her smile remains intact too. "I had no idea you were in such a rush to make some grandchildren for me! You girls can keep on going, don't let me disturb you." That's DEFINITELY not the reaction you expected. She barely even seems surprised? Her daughter suddenly has a dick for Christ's sake, how is she not yelling or panicking!? How is she not LITERALLY questioning everything in front of her!? Wait, making grandchildren?

"Wha- No! Nono that's a misunderstanding," you correct her immediately after which she glances back down to your unprotected pussy, which was still glistening with a mixture of female and male fluids. There's no doubt that you two were 'playing doctor' and had a little accident... one that ended with Gwen jizzing right into your lady bits.

"Is that so?" She took on a more mature and confident tone. "You two should talk about those things before having sex, you know? Boys and girls have to agree beforehand on whether or not they're okay with a little pregnancy risk. And you two look like you're taking on a whole lot more than just a little risk... who are you anyway? I can't recall seeing your pretty face before?" She leans in a little closer, which makes your heart miss a beat. This is awkward and uncomfortable as hell...

You're quickly tempted to point out that your dear sis pretty much **** you, but causing trouble would just make the situation even more volatile. Plus, neither of them knew of your true identity. You can't cause a big fuzz when they could just kick you out without hesitation... "Well it happened, so it's a bit too late now to talk about it, but I still need to wash her stupid sperm out of me!" It's only after your mother takes a closer look that she notices the predicament -- the bloated knot which kept the two of you joined.

"So? Just pour some cold water on it, that should fix the problem, no?" Your expression turns blank. That solution was... a little too obvious. Why didn't you think of that? How did she so easily think of it? You look around for some water to use before you see it right there, on the tray your mother had brought in! Perfect timing! You're just about to grab it before your mom snatches it away and holds it just out of reach!

"Not so quick! You two seem a wee bit tense right? Just give each other a kiss, cuddle a bit, and then we can take care of the problem. It's all about finishing sex with happy feelings, you can't just skip that step." She couldn't be serious? The clock is ticking! Especially that biological clock of yours.

"Damn it," you whisper under your breath as you raise yourself up and straighten your upper body against your sibling's perky chest. You reluctantly turn your head around to kiss her on the cheek, and feel her manhood gleefully throbbing against the snug comforts of your pussy.

"And the cuddling," your mother insists. After some quick thinking, you awkwardly lower yourself onto your side to lie down on the bed -- while Gwen remained glued to your back. The squishy sensation of her breasts against your spine was impossible not to notice. She spooned you rather halfheartedly. It's not a huge surprise, after all, she's already finishing dumping her load inside your snatch. And right now all that sperm was given ample opportunity to dive right on inside your cervix... if you didn't know any better, you could also swear that you began to notice a faint bulge forming against the comforts of your mother's pants... ?

More cum leaks forth from the snug seal that connected you to your sister. Her sperm was far more liquid than a normal human's, but that's probably also why she produced a far more impressive load. It was still sloshing around within your belly with every move. A sudden, wet pop announces the way Gwen's knot deflated enough to exit your sore lady bits, and you sigh in relief now that at least one thing is going according to plan! At least until your mother playfully snatches your towel and pulls it right off your feminine curves in one swift motion before you even have a chance to try and hold it in place! Yet rather than being met with teasing and giggles given this awkward situation, both women drop silent with their eyes fixated towards something near your naked back.

"What? What is it?"

You look back towards your slightly older sibling, and then follow her gaze to see she was staring at... a black, fluffy small tail. And it was emerging from your backside, right where your spine ended. The silence made you rapidly aware of the anxious, quickening beating of your heart while you stare on in shock.