You closed your eyes. After a moment's concentration, you moaned out loud as the sensations from your penile sister doubled between your legs. Opening your eyes, you took in the sight of the new sexy addition to your body.
Your mom now jutted out from your crotch, full-size and topless like your sister. Her skin was the same kind of semi-translucent quality that displayed the prominent thick veins that ran up her torso. Her and Jenny now essentially wrestled for room, your legs needing to be spread out really wide in order to fit them.
Both Jenny and your mom almost immediately began groping each other's fantastic tits and making out passionately, assaulting you with the intense pleasure from their hands, fingers, nipples, and tongues, all connected to your nervous system.
You could do nothing more than just sit on the couch and groan as your two penises made out.
After several minutes of your mother and sister edging you expertly, your mom finally broke the kiss and turned her dickbody to speak to you.
"Oh honey, I know I need you to take me back into the kitchen so I can finish those dishes, but me and your sister just need to cum so bad!" She reached a hand down and squeezed your hairy wrinkly scrote-flesh. Your sister followed suit, and a moment later she and your mom were working together to squeeze your enormous nuts against each other, making the three of you moan.
"Hah! Yeah Ben!" your sister replied. "Mom and I desperately need to be thrust into something!"
"Well, uhhh, thrust into what?" you asked.
"Let's go see if Tommy and Jessica are awake!" Jenny suggested excitedly.
"Ohhh, great idea honey!" your mom responded happily.
You weren't sure exactly what they had in mind, but nonetheless you stood up from the couch, and began waddling your way to the stairs. Your mom and sister clutched each other to keep themselves from swinging left and right too much. Your massive ballsack just dragged on the carpet behind you as you walked.
Climbing the stairs was even more interesting, as you literally had to haul your giant hairy nuts one step at a time.
Reaching the top and trying Tommy's room first, your mom gripped the doorknob with her nerve-tipped hand and used it to open the door. Inside, you saw Tommy and Jessica both sitting on his bed, playing Super Smash Bros on the old Wii hooked up to his little tv.
"Oh good, you're both up!" your mom announced.
They both looked over at the monstrosity their brother had become and didn't bat an eye, instead growing really happy all of a sudden.
"Hi mommy!" Tommy yelled. "We were just playing some before breakfast."
"That sounds wonderful, honey," your mom replied lovingly. "I'd hate for us to interrupt you, but me and your sister are so full of cum we're about to start leaking!"
You were surprised how forthright your mom was being about this. Also, she was now just a part of your body, but you didn't mind that she was calling the shots for the time being.
Your sister grinned seductively. "We were hoping your two talented asses could help us out," she said sensually.
Jessica and Tommy practically shot up from the bed with excitement and started undressing right in front of you. Within a few seconds both of their smooth hairless prepubescent bodies were bare naked in front of you, allowing you to see Tommy's tiny genitals and Jessica's developing tits and hairless slit.
The two of them giggled as they turned and leaned against Tommy's bed, using their hands to spread their young asscheeks, presenting you and your mom and sister with their seemingly untouched tight pink sphincters.
Your mom and sister reached their sensitive hands up and gripped your little brother and sister's hips and literally pulled you closer to them. They brought their faces up to the children's cracks and wasted no time in slurping away at their assholes.
Jessica and Tommy sighed contentedly, while you were once again moaning as you felt the nerves in your mom and sister's dick-tongues dance across the small orifices and coat them in precum.
You just leaned back, hands on your hips, for a few minutes, enjoying the pleasing sensation of your family's incestuous anilingus, before your mom and sister finally broke off from their fervent ass-smooching.
"Alright, are you two ready?" your mom asked teasingly. Your little brother and sister just looked back with big smiles, rapidly nodding their heads. They had an arm around each other and held each other close, squishing the sides of their asses together.
However, you just had to say something.
"Wait, are you sure you and Jenny are gonna fit?" you questioned bewilderingly. Suddenly, you noticed their were four sets of confused eyes looking back at you.
"Sweetie..." your mom began, "why wouldn't we fit?"
Your sister added, "Yeah! It's not like we haven't done this a thousand times!"
You blushed, for some reason embarrassed for even asking. "Uh, right. Never mind."
"Now, honey, if you wouldn't mind?" your mom said, obviously referring to the two lubed young asses.
"Oh, uh, yeah. Okay."
You steadily moved forward, bringing your mom's head up to Tommy's pink asshole and Jenny's head up to Jessica's. They both smiled as they were then pressed against the tiny orifices, closing their eyes before miraculously, the holes began opening up.
"Ahhhhhhhhh," Tommy and Jessica sighed as their mom and sister's heads began sliding into their rapidly expanding assholes, stretching open like loose elastic.
As amazing as it felt, you couldn't help but stare unimpeded as soon your mom and Jenny were inside your little siblings up to the shoulders.
"Keep going!" Tommy shouted, his face flushed with pleasure. You noticed his little dick was throbbing at its full 4" mast, and Jessica's pussy was dribbling lovejuice.
You didn't argue and began pressing forward even harder. You heard a loud doubled SCHHHHHLORPPP! sound as their magic puckers expanded even wider to swallow your mom and sister's shoulders, allowing you now to easily begin sliding the rest of their torsos into the two kids.
Inch after inch of your two anthropomorphic penises were slurped into your brother and sister, who weren't even reacting like it was hard at all, just that it was immensely pleasurable.
After a minute, you could go no further as the bases of your mom and sister's phallic bodies were all that was left, splitting left and right from between your legs. You were a little disappointed that from this angle you couldn't reach all the way to the bottom, but it still felt absolutely incredible as you felt your mom and sister grope their tits and lick the walls of the magically expanded young rectums that massaged them masterfully.
Tommy and Jessica had no evidence of the size of the insertions that were within them, aside from the impossibly stretched sphincters that spread their asscheeks unnaturally wide.
Beginning to get the show on the road, you started leaning back, sliding your dicks out of your little brother and sister until their shoulders almost exited, then used all your strength to thrust them back in, making you grunt.
Tommy and Jessica cried out as their mom and older sister pounded their guts.
Within no time at all, you had built up a rhythm, and were pistoning the two pre-teens as hard as you could with your slick lubed human-dicks.
Your younger siblings' legs shook as they were ravaged by adult-sized insertions, Tommy especially affected as your mom's head slammed repeatedly into his developing prostate.
The sheer quantity of sensations was far too much for you, and you felt orgasm building up deep in your gargantuan balls, which jiggled and sloshed on the carpet with each tempestuous thrust you took into the two small butts before you.
Tommy and Jessica were similarly having their minds blown by getting reamed by such supernatural cocks.
They showed their youth by blowing first, Tommy firing a few small rounds of prepubescent seed from his little cock while Jessica squirted from her juvenile clit.
The sight of your underaged brother somehow being virile sent you over the edge, and you cried out as tens of gallons of fresh hot cum traveled up your insides before being ejected out of your mom and sister's mouths, deep in Tommy and Jessica's intestines.
Your eyes rolled back with pleasure as rope after thick rope of sticky semen painted the insides of your little brother and sister.
It took a solid five minutes for the orgasm to end.
The three of you were breathing heavily as you decided it was time to pull your mom and Jenny out.
Copious quantities of thick white cream began dripping from the young assholes as you slid your two human dicks out of their respective sockets.
Jenny and your mom's heads popped out of the children's assholes with a loud FFFUMP! followed by cascade of cum that splashed onto the carpet. You gazed at Tommy and Jessica's gaping holes, allowing you a view deep into their guts before the two sphincters quickly closed themselves. Within only a few moments, they resembled their normal selves, albeit with some semen still seeping out.
Your mom and sister were absolutely drenched.
They both looked to be asleep as they were completely exhausted from expelling so much manfluid.
Tommy and Jessica both climbed their naked bodies up onto his bed and collapsed, similarly spent.
That was absolutely incredible.
But what do you want to do next?