You slide a hand down your mother's body to her bulging belly once again, feeling along the shapes of your sister's outline poking through as she continues to squirm around inside. Your new lover coos with pleasure as you caress her with your fingers; she must be particularly sensitive now that the skin is stretched out so much. Her pussy is soaking wet, even dripping her sweet juices onto the bed from her arousal, and it's not long before you yearn to sample them yourself. Kissing your way down Sarah's body, and of course stopping momentarily to appreciate every square inch of her newly-enlarged tummy, you finally approach your target. The smell alone is intoxicating, your mother's heavenly scent overpowering your mental faculties and driving you closer and closer until at last you eagerly plant your lips directly in the center of her pussy lips. Without hesitation, you slurp up a mouthful of the bountiful nectar flowing from her loins, savoring it like a fine wine. Sarah responds with a passionate cry and a slight jerk of her hips, and with each subtle movement of your tongue along her most intimate areas her hums and moans increase in fervor.
"Mmmmmm... Petey, that feels oooooooh so good..."
"Want to feel even better?" you ask between mouthfuls of your mother's mound.
"Oh yes, Sweetie," she pants in response. "Make Mommy feel goooood..."
"Alright, here I come!"
Mimicking your sister's technique when you watched her being engulfed, you grab hold of the top of your mother's thighs and pull hard, smashing your face directly against Sarah's slippery cunt.
"OH!" you hear her exclaim, startled by the unexpected pressure. Once she realizes what you're trying to do, though, she simply sighs, relaxes her lower body and spreads her legs further apart to give you better access.
Just as before, the pressure pushes your mother's hips and pussy lips apart, and soon enough you feel your head slipping into the slick opening. The inside of the vagina is tight but not unbearably so, still giving you enough room to move slightly and, more importantly, breathe. It's like pushing yourself into a warm, wet and really long ski mask. With the needle threaded, so to speak, you reach your hands down and slip them inside alongside and past your head, hoping that you can reach all the way to her womb to get some extra leverage. Mom is clearly enjoying this since you can hear her cries of delight even through the spongy walls of her vagina, and despite trying to stay still so that she doesn't hurt you, you can still feel her instinctively rocking her hips over you trying to push you even deeper into her body.
You reach as far as you can inside your mother but come up just a bit short of her cervix, so you instead opt to propel yourself forward with just your legs. It's a bit difficult to get much force since your feet keep slipping along the bed sheets, but with some effort you finally work up enough pressure to slip your shoulders into the opening as well. Inch by inch, your body sinks ever deeper until at last, once Sarah's wide pussy encircles your chest, you can at last get your hands through the cervix to the larger area of her womb. Your left hand brushes up against something large and smooth, and you quickly deduce that this is your sister already tucked away deep inside your mother. Now that you have a hand hold, you spread your fingers apart and begin pulling yourself through the slick tunnel again.
"Nnnnggghhaaa! More! MORE!" you hear Sarah's shouts muffled through her body as you continue your journey, your belly button now passing between her nether lips.
Suddenly, you feel a hand grab yours and tug sharply, causing you to slide forward six inches all at once and putting the top of your head at the entrance to your mom's womb. Jennifer must have realized that you were coming to join her and decided to help you out, which is good because it is getting harder to move your legs with your hips now being engulfed. There is a bit of a snag as your rock-hard boner gets caught, but Sarah quickly reaches down to fix that, tucking your dick safely inside her before continuing to rub her increasingly-swelling belly, soon to be filled with not one but both of her children.
"Hey Sis," you casually greet Jennifer as your head pops through the cervix. "This looked like way too much fun, so I thought I'd join you."
"Oh you can't even imagine, Big Bro! It's so warm and comfy in here. I'm glad you made it in, too!"
"Well, I'm not all the way in yet."
You can barely see her smile at you in the darkness of Sarah's womb. "Don't worry. I'm not done pulling yet, either."
With that, your sister gives your arms another tug, forcing your shoulders through the tight opening and drawing your knees into your mother's vagina. As you make your way inside the more spacious womb, your cheeks brush up against the sides of your sister's calves, and it dawns on you that she is basically pulling you in between her splayed legs to lay on top of her.
"MMMMMMMMMM... AH AH AH AAAAAAAAAH..." Sarah cries out, and you can feel her muscles clamp down heavily on your lower body. Soon, all of your surrounding are shaking around rhythmically as your mother reaches her climax.
"Sounds like Mom's really enjoying having us in here," Jennifer remarks as she continues dragging you inside and across her body.
The orgasmic contractions, aided by your sister's efforts, would make it appear to an observer that your legs are being greedily swallowed by Sarah's hungry pussy. She sighs contentedly as her final convulsion draws your toes fully into her vagina, sealing you completely inside just like her daughter. She immediately moves her hands all along her belly, which is of course twice as large as before and extremely taut, to feel you settle in. It doesn't take long before your legs pass through the cervix as well. Now completely inside your mother's womb, you can faintly hear her breathing and heartbeat around you, which is gradually slowing down now that she's coming down from her latest orgasm. You also find yourself in an enticing position face to face with Jennifer, your chest and abdomen pressed tightly against hers with her thighs straddling your hips.
"Well, that was fun," you say. "Exhausting, but fun."
"Definitely!" your sister replies. Even in the darkness, you can see her grinning from ear to ear.
"So now what do we do?"
"Well, I've just been kinda shifting around in here trying to get comfortable. Mom loves it when you squirm." To emphasize her point, she wriggles her hips around underneath you, and you can hear Sarah's muffled hum around you and even feel a slight pressure as she caresses your back through her skin. "Basically, the more we wriggle around in here, the more fun it is for her."
"So all we have to do is move our bodies a bunch, eh?"
"Yep..." Jennifer confirms, her grin growing even wider as she continues, "...and I know exactly what we can do that will get our bodies moving."
"Oh?" you playfully inquire, suspecting the answer already. "And just what do you have in mind, my sweet little sister?"
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