If your cock wasn't hard as a rock by now, the scene unfolding on top of your parents' bed has certainly fixed that. Your mother Sarah is lying completely nude on her back, legs spread wide apart to allow easy access for an also naked Jennifer, your sister, to bury her head between them. Mom's hands are on either side of her daughter's head, gently encouraging her to lick and suck on her mother's juicy pussy. With her arms positioned this way, your mother's breasts are pushed together to protrude tantalizingly from her chest, bouncing just slightly when she occasionally squirms with pleasure on the bed. Sarah's eyes are rolled back slightly, and a great big grin adorns her face; clearly she is having the time of her life. This is only confirmed by the constant stream of hums and moans escaping her lips as your sister continues working on her most sensitive areas. From your current perspective, you can't really see Jennifer's face, but you assume she is really enjoying herself as well, her head firmly in place and unwilling to move even an inch away from between her lover's thighs.
"...huuuuuuuh... Hello Pete..." your mother finally addresses you between hums. "How... mmmmmm... nice of you to... oooooooohhh... stop by todaaaaaaaay..."
You aren't quite sure how to respond, or even if you can for that matter. "M-m-m-mom... what are... you..." you manage to stutter.
"Oooh, Petey," she replies. "Mmmmmm... Jennifer and I are... aaaahhhh... just having a little... mother-daughter bonding time."
"I, um... I see..."
"Looks like maybe... hmmmmm... you want to join in, too..."
"Huh?" Your mother's gaze shifts downward to your fully-erect cock, which is now not only poking through your pants but is also being absentmindedly stroked by your left hand. Once you realize what you're doing, your hand stalls but does not move from the bulge. "Well, I..."
"Okay, Jennifer, I think that's gooooooooood for now. Now let's... mmmmmm... do some bonding..."
"Sure thing, Mom," you hear your sister's reply muffled by Sarah's cunt. You can only watch from the doorway as Jennifer lifts her hands up to get a firm grasp of her mother's thighs, then shoves herself forward. You are not expecting what happens next: Sarah's hips and vagina respond to the sudden pressure by expanding wider and wider like some kind of sexy rubber band, allowing her daughter's head to sink deep inside her body. Jennifer repositions her arms and legs again, and with a second big push she forces her shoulders inside as well. Your mother's eyes roll back again, and she groans as her daughter begins disappearing inside her.
"What in the..." you stammer.
"Ooooooh, that's it, baby," your mother coos as her daughter makes her way deeper. "Mmmmm, that's soooooo good."
"Mom... what are you..."
Sarah glances up at you again, unable to move anything other than her head right now with her hips stretched widely around her daughter's shoulders. "Come over here, Petey. Mmmmmmm, I think she needs a push."
Still incredulous about the whole situation, you step toward the two women on the bed as if on autopilot.
"That's it," she softly moans. "Just put your hands on her feet and shove her deeper..."
"How... how are you... doing this?" you ask, finally able to form a complete sentence. The rest of your body is still in shock, but complies with your mother's wishes. Soon, your hands are grasping the soles of your sister's feet, and you apply a gentle pressure, slowly sliding her body further inside the pussy devouring her. With a slight popping sound, you see and hear Jennifer's breasts slip into the opening.
"Oooh God, that feels better than I ever imagined!" your mother exclaims, writhing with pleasure on the bed when your sister sinks deeper inside her. "I found this... mmmmmm... lotion at the store... ahhh... that's supposed to make your skin... oooooooooh... younger and more... flexible..."
"Lotion?" you repeat. By now, you've unconsciously pushed Jennifer in up to her waist, and you can see Sarah's stomach beginning to expand to make room for her daughter.
"Yes," your mother continues. "Hmmmmmm... it works really well... and I... ooooooh... must have accidentally gotten some... ummmmm... in my mouth and swallowed it... it made my whole body a little more... mmmmmm... flexible..."
"A little more flexible?!?"
"Well, it wasn't... ooooooh... like this... at first, but I wanted more... mmmmmmm... so I tried... making a smoothie with it... aaaaahhhh... it was so good, and now..."
Another audible pop can be heard as Jennifer's hips pass through the super-stretched vagina opening, eliciting a deep moan from Sarah as she continues consuming her own offspring. With the widest part already inside the opening, the girl now slides in much more easily. Your mom's tummy is now enormous but still somehow stretching like spandex to accommodate its contents. Even now, you can see the outline of your sister's body as she shifts around inside the womb to find a comfortable position.
"Mom, you're like made of rubber now!"
"Yes, Petey... maybe it worked... a bit too well... but damn does this feel so good!" She leans her head back down on the pillow and looks up at the ceiling. "Do it, Honey. Send your sister home to Mommy!"
At this point, you notice that you're only pushing with one hand now, the other having found its way inside your pants and back to stroking your throbbing member. This time, you ignore it and simply shove forward with your other hand. Sarah's groans and moans increase in speed and pitch as her daughter's legs sink easily into her womb like a hot knife through butter, and soon enough all that remains of Jennifer is her wriggling feet. Finally, your mom suddenly tenses up, screaming with orgasm and sucking in the rest of her meal with the rhythmic spasms of her pussy. From outside, you can see Mom's hips returning to their normal position and Jennifer curling up inside the now humongous tummy, completing the mother-daughter bonding session.
"Oh God, Petey, that was so incredible! It feels oooooh so good to have my daughter back inside me." She eagerly rubs her enormous belly, savoring every bend and fold of Jennifer's outline poking through in addition to the sheer size. You can't help but do the same, placing a hand on her stomach and running it all along her taut skin. Sarah moans again as you touch her, apparently enjoying your caress.
"I still don't know..."
"Shhhh," your mother shushes you, grabbing your arm and pulling you onto the bed next to her. "All you need to know is that your sister is well taken care of, and I feel so horny now." She glances down at your cock, which you are still stroking underneath your pants. "And from the looks of it, you do too..."
"Well, maybe," you admit.
Sarah leans over as much as her newly expanded body will allow and brings her lips to yours in a tender kiss. Instinctively, you reciprocate, and soon the two of you are lost in forbidden incestuous passion. Your new lover wastes no time in ripping off your shirt and pants, leaving you naked on the bed along with her. As you continue your kiss, you run your fingers along every inch of her body you can reach, confirming that she indeed has a soft rubbery pliability all over her. This makes playing with her ample breasts especially fun as you pinch and pull the springy orbs all over. Mom just hums in response, her breathing growing heavy again as her own son plays with her body.
"This is amazing, Mom," you say between kisses of her erect nipples. "You're like a living sex doll now!"
"Oh, is that right? Well, maybe you should have some fun with your new pregnant Mommy sex doll." She winks at you as she returns a hand to her bulging daughter-filled belly, accentuating the "pregnant" part. "I'll do anything you desire, Honey..."
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