You really wanted to test the limits of just how far you could inflate your little sister with your cum, so you decided to get back on the proverbial horse.
"You know what, Jess?" you began. "I think we've had a long enough break. How about I fill you up until you're taking up the whole room?"
"Yes! Yes!" the adolescent girl with the monstrous belly cheered. "I wanna get SO big, Ben!"
You smiled at her and made your way around to her side. It took a bit of effort to climb your way back onto her, especially since you're lugging around that enormous package. The sliding of your watermelon-sized nads across her skin felt really good, though.
Finally, you were straddling your sister once more, and eagerly aimed your huge cockhead right at her mouth.
"Open wide, here comes the plane," you joked.
Jessica laughed and did as she was told. You leaned your hips forward and stuffed her mouth full of cock.
With no more than a mental command, you were thrown into orgasm once more. You groaned loudly as your magic balls resumed unloading into Jessica. She once again showed no signs of struggle as she guzzled down gallon after gallon of thick spooge.
You felt her belly brush against your buttcheeks as it started expanding some more, and you grinned knowing you wouldn't stop until she was cartoonishly massive.
"Swallow my cum, Jess," you commanded. "Let's fill your room up mmh!"
Like before, you relaxed and closed your eyes, reveling in your endless climax and allowing yourself to forget about your sister's condition, at least for a time.
Minutes passed.
Eventually, Jessica had inflated so much her body lifted yours off the bed. You were now sitting atop her squishy expanding cum-filled belly, however you were unimpeded in your ability to keep your cock in her mouth.
Around Jess's loud gulps, she started letting out muffled moans. Her eyes rolled back in her head, appearing as though the sensations of being filled beyond natural possibility was giving her immense pleasure.
Her bed started to creak constantly, struggling to hold up her immense weight, so you morphed it away. Now your sister rested on the carpet, her body beginning to deform from the crazy inflation.
It was almost as though her skeleton had disappeared for the most part, as her limbs started getting spread out across her expanding jiggly form. Her arms and legs maintained their normal size and appearance, but before too long they were several feet apart or more, separating to different corners of the room.
After 20 minutes, Jessica was far beyond the blueberry girl from Willy Wonka. Her soft rotund skin was pressing against the walls of her room. Your head was now almost touching the ceiling from how high her belly now reached.
Underneath you, the inflation had finally begun to affect her already enhanced tits, and they were growing monstrously massive with visible veins all over the mammary flesh. Pretty soon, they were larger than your giant testicles, but even then they were dwarfed by the rest of her body.
With you having to crane your neck downward to fit under the ceiling, you decided it was time to finally stop. With only a thought, you ended your orgasm and let out a big sigh.
Pulling your cockhead out of Jessica's unnaturally gaping maw, she once again let out a belch.
MMBURGHHHHHHHHHHHHHHHHHH!
The force of the burp shook the entire room. Her whole body rippled underneath you and you could hear your sea of cum sloshing around inside her.
"That's it, Ben?" she asked, somehow wanting even more.
"Yeahh, I gotta stop," you told her. "Pretty soon I won't be able to fit in the room anymore, haha."
"Hmph, we should do this in the living room, next time. Or better yet, in the backyard. That way I can get even bigger."
"Haha, yeah! We should."
You turned and crawled across her bus-sized belly. At its apex, even on your hands and knees your back was occasionally grazing the ceiling. Reaching the end, you sat down on your rear and slid down to the floor like Jess was an amusement ride, landing right in the doorway, as you planned.
Turning back to face her, you took in her absurd new form.
For starters, the cumflation had greatly expanded her vagina, which now was as tall as you were, and was only a couple feet from the door. The entire giant pink pussy was large enough for you to easily climb into, and you gazed all around at the light dusting of hair that covered its swollen lips. Her clit was the size of your head, and passively leaked gallons of lovejuice down her 3-foot taint and onto the carpet below.
Jessica smiled at you, her head all the way at the back of the room, almost touching the ceiling. Thankfully, even after the warping of her body she still had her right arm near her head, however it was angled directly toward her in a weird way. Her left arm, however, was all the way over in the corner to her left, and idly rubbed at her belly as she relaxed.
Your sister's legs were each in corners of the room across from her head, and one of them somehow was backwards.
You heard a loud gurgling in Jess's belly, and a second later, a wet fart spewed from her tire-sized asshole underneath her.
PFFSHCPFFFSCHHHHHHHHPFFFF
A puddle of your cum oozed out onto the carpet.
Jessica giggled.
Just then, you heard footsteps beside you. Looking over, you saw your mom had ascended the stairs and was making her way over to you.
She didn't even blink at the absurdly massive genitals you had between your legs, walking up beside you and looking into your sister's room.
"Oh, I should have known," she said, chuckling.
You however, were transfixed on your mom's breasts. She was wearing a low-cut shirt, revealing a fantastic amount of cleavage, and you obviously still had tits on the brain after morphing Jessica's almost an hour earlier.
Brazenly, you reached both hands over and started groping your mom's tits through her shirt. Instead of freaking out, she smiled at you sweetly, letting you play with her as you liked.
"Here, sweetie," she interrupted, taking hold of her shirt and lifting it over her head. She wasn't wearing a bra, and her immaculate boobs were bared to you, their large nipples growing erect in the cool air.
"Thanks," you said, immediately resuming copping a feel.
Not satisfied with only feeling, you leaned down and stuffed a tit into your mouth, suckling on its nipple blissfully.
"Oh honey, that feels so good," your mom cooed.
"Mmf," was all you could reply.
After another minute of sucking on your mom's boob, you reluctantly released it from your mouth.
"Say mom," you began after regaining your breath. "What do you think about Jessica being inflated like that?"
"I think it's wonderful, sweetie," she answered happily. "It obviously makes her happy being filled up with so much semen."
"Yeah? Would you like to be like that, mom?"
Your mom blushed. "Ohhhh, I don't know honey."
"Really? Cuz right now I'm thinking of taking you to a huge gym and filling you up until you're spilling out of it."
"Hmmmmm," your mom hummed, subconsciously sending a soft hand down to rub at her clit through her yoga pants.
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