Day 3 - Gwen accepts your wish, and then some...

Gwen had a massive grin on her face, like a kid that just found the cookie jar. So that makes you... the cookie jar. That's comforting, kind of! With another look down, you can see your still bulging belly. Your sibling noticed it as well -- there's no doubt that both of you realized how much it looked like you're already knocked up.

And perhaps even to your sister's surprise, her girl-cock throbbed and bounced in glee! Of course, she had no idea that you've given her two pulverized pills of Viagra. As far as she knew, she simply enjoyed the sight of her seemingly pregnant, younger sibling. It's brilliant how well your plan is executing! Still, you can feel her sperm rapidly sloshing around inside both of your holes now -- much of it swirling inside your pussy and womb, even more of it now stuck in your rear. It's almost impressive how bloated you feel with the sheer amount of semen she deposited inside you! And those millions and billions of tiny sperm cells are literally so energetic that you can pretty much feel them moving around. It's like she's now... some kind of fertility goddess? Impregnation queen? Mistress of insemination? You're gonna have to think of a fitting nickname for her later, right now you seriously need to get rid of at least some cum.

"So uh, gimme a moment of privacy and I'll be right with ya when I'm done, okay?" She nods her head, and with a lingering smirk proceeds to leave the room. Just in time too, you can feel her sperm beginning to leak down your thighs already! There's no point in sitting down on the toilet and waiting for it to come out on its own, that stuff is so sticky that you'd wait for days. Instead, you step into the warm shower and soap up your entire sweaty body before rinsing all the dirt and goo off! Sex is hard work. Just as hard as Gwen's dick you muse with a loud laugh, before realizing that people can hear you laughing... awkward.

When the outside of your body is clean, you reluctantly remove the tampon you had stuffed into your vag earlier, and let a thick trail of spunk ooze down your legs all the way down to your toes! Your insides are stuffed. With the shower-head aimed at your vagina, you gradually coax more and more of the semen out of yourself -- a majority of her swimmers are secure inside your womb, anyway. When that's done, you repeat the process with your bum to give yourself a small enema, washing out the gallon of baby-gravy she loaded you with. Man, having sex with her repeatedly is gonna get messy. When you finally step out of the shower, it's almost impossible to tell that you have had intercourse at all! In fact, nobody would even suspect that your sister's sperm was still securely trapped inside your womb and helping to turn you into a teenage mommy!

It's not like this is particularly your fault. It's Gwen who introduced you to the wonders of female masturbation! Girls have to put up with a lot of crap, but their orgasms are totally worth the trouble. After you used the towel to dry yourself off, you wrap it around your chest and return to your sister's bedroom. Unsurprisingly, she sat right there by her computer while stroking her girl-cock and watching... something. A cute blush follows as soon as she notices your presence, but she was far too invested in whatever she was watching -- which as it turns out, was a playlist of creampie videos! You can't help but to giggle blissfully as you approach her from behind and allow your head to rest on her shoulder. She was quietly rubbing and stroking her new appendage, steadily improving with how to work it. Those male hormones were really having an effect on the poor girl! Awesome~ The hornier she gets, the more sperm will be waiting for you in that busy ball-sack between her legs! Her cock at this point is little more than an amazing delivery-mechanism for all that useful spunk.

You let your warm breath caress her neck for a short while longer before moving on to get in front of her, and straddling her lap. With a quick glance back at the computer monitor, you can see the amateur girl riding her boyfriend and begging him to cum inside her. "So you're into having the girl on top, huh..." you smirk at her before simply dropping your crotch down and impaling yourself on her appendage! There's a brief squelch, but she easily slid back into your cunt just as she did in the wee early morning hours...

"Ah!" An embarrassed feminine gasp escapes her lips. She looks down just in time to see your puffy pussy lips snugly surrounding the base of her dick. There was no trace left of her manhood, it was all securely buried inside your snatch.

"Nuh-uh, Gwenny. Keep your eyes on the screen," you instruct her while using the opportunity to look back at the action yourself. The young chick, high-school aged, didn't seem to be particularly skilled. She rather clumsily alternated between raising her hips, then smashing them down against the dude's crotch to take his cock, and then grinding down against his pubes for a moment before raising her hips again and repeating the process. The next time she does so, you imitate her motions and slam your pussy down to take in every inch of your sister's erection!

As you keep on riding her at a steady pace, you can't help but smile at how... efficient this is! For one, there's no risk of falling in love with each other because you are brother and sister. Secondly, there's plenty of mutual benefit here! Your hormonal sis' gets to nut into a cute young teenager, and you get to have her sperm all for yourself and your cum-starved pussy. At this rate, she'll get you preggers in no time and you get to keep your body with all its benefits!

"J-john! You have to get off, quick! I'm getting close!" Your sibling's hands move down to your waist in an attempt to lift you off, but you simply slap her fingers away. "Shh, just keep on looking at the screen." You follow your own advice and look back to see the girl now sitting alone on the bed, her legs spread wide apart and a gooey river of cloudy cum was drooling out of her deflowered vagina. She was crying and sobbing. "I told you I'm not on the pill!" she whines, at which point more cum bubbled out of her worn-out slit.

"Fuck!" Gwen tensed up immediately after cursing, wrapped her arms around your chest and held you close. Your breasts were squishing against hers, and you used the chance to place a few soothing kisses on the line of her neck. At the same time, you notice a growing heat in your belly! There we go. More and more of her semen squirts right into your fertile twat, the perfect cocktail for baby-making! The lips of your cunt were tightly wrapped around her appendage to avoid spilling even a single drop of the precious fluid. Your sis kept on holding onto you for the duration of her climax, filling you right up with all of her sperm! This is perfect!

When she's finally done, her breathing harsh and rigid, you allow yourself the chance to grin down at her exhausted face. "I told you I'm not on the pill," you imitate the girl's words, before placing a quick kiss on Gwen's cheek. "I think you just got me pregnant." It wasn't the first time that she came inside you, but she doesn't have to know that, right? Her only response to those words was the throbbing and flexing of her dick, deep inside your belly against the comforts of your cunt. Her breathing came more quickly while her blush grew. She was aroused as hell. "Or do you wanna make sure I'm knocked up?"

The next few hours are a blur of sex. Fueled on by Viagra, Gwen was impossible to satisfy and fucked you bent over the desk, on the chair, across the carpet and on her bed. Every single piece of furniture inside her room ended up getting used to explore new positions, and the only breaks you took were whenever you needed to take a quick shower to squeeze some of the cum out. She didn't bother pulling out even a single time, both of you knew what was at risk if she didn't succeed in fucking a baby into you. By the time the sun goes down, both of you are exhausted and drained -- literally.

Gwen was the first one to wake up again.. Her heart skips a beat as soon as she glances over to the nightstand and sees that it's already afternoon! Shit! She missed the final opportunity for more sex! It's too late! This time around, she was actually afraid of looking down just in case she wouldn't see her beloved dick still attached to her crotch. However... with a swift glimpse, it was still there! She still has it! Jackpot! Immediately she crawls across the bed to approach her still sleeping sibling to celebrate the good news. The sight she was treated with wasn't a surprise, but still thoroughly welcoming and... arousing. Even more so when she realized the implication of John still being a girl. Someone's pregnant!

Gwen of course hadn't pulled out even once, true to the male hormones that were taking control of her mind, her personality, her behaviour. Getting laid was now pretty much the primary goal for the rest of her life, very much like most teenage boys. The secondary goal now that she's got her wish and a permanent set of male equipment? To impregnate as many girls as possible, of course! She warmly pulls a blanket over your naked body and allows you to sleep for a little while longer. After all, pregnant girls need their rest...

The positive karma catches up to Gwen just a few moments later when the doorbell rings, and a familiar voice can be heard downstairs... "Mom's home!" Gwen barely even manages to put on a fresh set of clothes before rushing downstairs to embrace her mother with a particularly eager hug, and a noticeable bulge in her pants.

The maternity ward is going to be extra busy by the end of the year...