For Max, the next twelve hours felt like years. Between the crushing pressure of his stepmother's big, round rump, her incessant unladylike snoring and equally-incessant farts, he barely managed a single minute of actual sleep. His only moment of relief came around 3:00 AM when Victoria rolled onto her side and briefly dislodged him from her cheeks—but despite being half-asleep, she wasted no time bringing a hand back to return him to his rightful place. Since then, buried with his face right up against her colossal, frustratingly productive asshole, he hadn't budged. 

With his stepmom's ass dominating all five of his senses, the three-inch freshman had no way of knowing how much time had passed. At this point, the only thing he cared about was getting out of here as soon as possible—and making it clear to Victoria that he had no interest in spending a single additional second in her ass ever again. Unfortunately, when the Mexican MILF finally stirred awake, her digestive system had a final parting gift for him.

BBBBRRRRAAAAAAAPPPPPPPP

While Max was borderline numb to the effects of Victoria's gas by now, that certainly didn't make it smell any better. Going off the aroma of this particular fart, which was very much in line with the last 40 or 50 such farts she'd cut in his face since last night, the burritos she'd enjoyed yesterday with Bea were clearly still doing their thing. Hopefully, she'd take pity on him and eat a little lighter today—although, knowing his stepmother, he had no reason to count on that.

"Mmm," Victoria cooed, clenching her cheeks around her shrunken stepson. "Morning, sweetie! How'd you sleep back there?"

"Fine," grumbled Max, allowing himself to go limp as his stepmom reached a hand back to peel him out of her ass. "H-how about you?"

"Marvelously." Victoria grinned, biting her lip. "I think that was the best I've slept in years."

"Oh." Trying not to think about the implications of this statement, Max did his best to force a smile. "Good. Listen, uh, sorry if I gave you the wrong idea yesterday, but-" 

Before the three-inch freshman could continue, a loud buzzing from the nightstand cut him off—and when he looked over and saw the caller ID preview on his stepmom's phone, he went white. 

"Hold that thought, sweetie," said Victoria, setting her stepson down and rolling over to answer the call. "I think that's Izzy. I'm sure she's almost here."

"Izzy?" Max winced, ducking down to avoid being pancaked by one of his stepmom's powerful thighs as she shifted across the bed. Half the reason he'd agreed to let Victoria become his new campus chaperone was to avoid getting stuck at home with her daughter, his stepsister. "W-what's she doing here?"

"Just dropping off some stuff for me," said Victoria, picking up the phone.

"I told her what happened, and she decided to drive down this morning."

"From Sunnyvale?" Max squinted. "Isn't that, like... a six-hour drive?"

"It is," said Victoria, looking at her phone. "But it's 11 AM."

"Oh," said Max, feeling more and more disoriented by the second. "So... she's here?"

"Almost. What's the matter?" Victoria frowned. "Don't tell me you're scared of your own little sister seeing you like this?"

"She's not my... nevermind." Max groaned. Technically, Izzy was only his "little" stepsister by about five days, but that had never stopped her from pulling rank with her mom as the baby of the family. "I just-"

"One second, sweetie," said Victoria, finally putting her phone to her ear. Max could hear her voice change the second the call connected—rising to a register of affection it never held for him. "Hello, honey! Have you parked yet? Yeah? Perfect! Yeah, room 201. Just knock when you're here. Alright. Love you too. Mwah!" 

"Fuck," Max muttered, shaking his head.

"What was that, sweetie?" Disconnecting the call, Victoria returned her attention to her shrunken stepson. "Did you say something?"

"Nothing," said Max, sighing. While he knew he wouldn't have any control over the day's trajectory once Izzy arrived, he still had a window to clear this whole butt situation up—and depending on how long his stepsister stuck around, he wasn't sure when he'd get that kind of chance again. "But what I was saying before-"

"MOM?"

Recognizing the voice at the door, Max grimaced. "That was fast."

"No kidding," said Victoria, springing out of bed and grabbing the same pair of booty shorts and tank top she'd worn to House Diana. "Always a smart one, that little sister of yours."

Watching the mature amazon squeezing her borderline supernatural curves into the still-too-tight activewear, it was hard for Max not to stare. The experience of being so much smaller than his stepmom — and, by extension, her eye-popping figure — was still a lot for his horny adolescent mind to process. Based on the way she smiled when she met his gaze, she understood this just as much as he did. 

"You know my eyes are up here," said Victoria, giving her hips a playful shake. "Right, sweetie?"

"Huh?" Max blushed. "Oh, uh, yeah. Listen, uh... would you mind if I, uh... maybe, like..."

"What is it, sweetie?" Victoria winked. "You wanna hitch a ride in Mama's boobs again?"

"No," said Max, trying to think of a way to ask his stepmother if she'd be willing to hide him somewhere until his stepsister left. "It's just..."

"HELLO???" Again, the voice behind the door cut Max off.

"Coming, sweetie!" Leaving her shrunken stepson hanging once again, Victoria bounced back over and unlocked the door—revealing her darling Izzy, in the flesh. 

Much to Max's chagrin, the bottom-heavy Mexican-American 18-year-old remained every bit her mother's daughter. While she was a few inches shorter than her mom at 5'7" and a tad lighter at 200 pounds, she'd inherited every bit of Victoria's looks and natural confidence. With her straight black hair in its usual emo fringe, her brown eyes and full lips covered in their usual quantity of black eyeliner and lipstick, her cute, round face accented with its usual quantity of piercings, and her outfit — a green t-shirt over a black and green long sleeve, a black pleated skirt over green leg warmers, and a pair of black boots — dotted with the usual mix of vague stains, she also seemed to remain committed to the same crusty "Mall Goth" aesthetic she'd been rocking for as long as Max had known her—a look that made her a big hit with boys and thoroughly unemployable anywhere other than the 7/11 by their house in Sunnyvale.

"Hey, Mom!" Scanning the room and landing squarely on the shrunken, naked young man standing on the bed behind her mom, Izzy grinned wickedly. "Sup, big bro... or should I say, lil bro?"

As mother and daughter shared a laugh, Max could feel his face getting warm. Already, he really didn't like where this was going. 

"Easy now, honey," giggled Victoria, stepping back over to the bad. "I think we're embarrassing him."

"Good." Izzy's grin grew. "God, what a little perv! I'm sure he's loving this."

"Oh, don't be so hard on him," Victoria chuckled, bending down to pat her stepson's head with a finger. "You know he's never been good at standing up for himself. Especially with you."

Hearing this, Max couldn't help grimacing again. If his stepmom's tendency to smother him wasn't annoying enough, her tendency to constantly undercut him in front of his stepsister was even worse—and probably had a lot to do with the power dynamic that had formed between the two stepsiblings.

"True that," said Izzy, joining her mother beside the bed and leering over her three-inch-tall stepbrother like a bottom-heavy goth Godzilla. "I'm sure this is, like, your worst nightmare, huh? Big bad Izzy, ten times your size?"

"More than that, honey," said Victoria. "If you're 5'7", and he's three inches tall, that's..."

"Ah, whatever," said Izzy, rolling her eyes. "You know I hate math. Point is, I'm big, he's small, and he can't do shit about it."

Ignoring her daughter's characteristic disdain of "nerd shit," Victoria beamed. "Well, I suppose I can't argue with you there."

"Damn," said Izzy, crouching down to put herself at eye level with her stepbrother. "This is fuckin' trippy. So you're just gonna, like, take care of him from now on?"

"That's the plan," said Victoria, smiling proudly. "I'm his new campus chaperone."

"Jeez, lil bro," said Izzy, looming even further over Max. "I always knew you were a loser, but this is next level! You can't even go to college without mommy, huh?"

While this was happening, Max remained totally paralyzed. His stepsister was clearly just as much of a wild card as ever, the only person on earth who could make the prospect of spending the rest of his life with his overbearing stepmom seem like a dream come true. She'd been the bane of his existence since they day they'd met —  waking him up most mornings by farting in his face, forcing him to rub her feet most afternoons after school, using his bedroom as one big laundry bin for her dirty underwear and socks, and subjecting him to humiliating games of truth or dare with her friends on the weekends — and he had a feeling that this was another significant factor in his current total lack of self-esteem. Now that she was twenty times his size, he could hardly imagine what else she might be capable of subjecting him to—and he really didn't want to find out.

"Not anymore," said Victoria, just as amused by Izzy's observation but trying — and failing — to hide it for her stepson's benefit. "Want to hold him?"

Izzy's eyes lit up with mischief. "Absolutely!"

"Oh, uh," Max stammered. "I don't know if that's a good-"

"Relax, bro, I'll be gentle." As the bottom-heavy mall goth extended a hand toward her stepbrother, a gurgle from her stomach made her pause. "Ooh, actually... better idea."

Before Max or Victoria could ask Izzy what she meant, she stood up and turned around to show them—sticking out her butt toward her shrunken stepbrother just in time to hit him with an absolutely massive fart. 

PPPPPPPRRRRRRRRRRTTTTTTTTTTTT

Even after a day of near-constant proximity to his stepmother's ass, Max found the experience of getting gassed by his not-so-little sister uniquely unpleasant. Back when they'd lived together, this had been one of her favorite ways to torment him: coming into his room whenever she had to let loose. Of course, unlike her mother, who'd had the common courtesy to pass her gas into her stepson's air purifier, Izzy had always preferred doing so right in her timid stepbrother's face—never close enough that Max actually got to touch her butt, but enough to leave him flustered every time. Here and now, at least twenty times smaller than before, he felt even more degraded—and if the smell was any indication, his stepsister's diet of gas station snacks and microwave taquitos hadn't changed much since he'd moved out.

"Whew!" Watching her stepbrother doubling over in agony in the aftermath of her latest release, Izzy laughed. "That was a good one."

"Isabella!" Victoria did her best to affect an air of outrage, quietly brimming with pride at her daughter's total lack of inhibition about her bodily functions—something the Mexican MILF had spent much of her own adolescence teaching herself not to be ashamed of. "Who raised you?"

"Who do you think?" Looking back at her mom, Izzy grinned again. "C'mon, you know he likes it."

Dropping any pretense of disapproval, Victoria grinned back. "You don't know the half of it. Yesterday... well, actually, we were just talking about that before you came in." Turning her attention back to her shrunken stepson, the mature amazon chuckled. "Max, since you said you don't want to ride in my boobs again..." Shooting him another wink, she gestured toward her prodigious rump. "Does that mean you'd rather go back in Mama's panties?"

"Back?" Izzy burst out laughing. "Wait... you had him in your ass?"

"Mmhmm!" Ignoring the way Max was now blushing, Victoria nodded. "For a couple of hours, believe it or not. Bad case of Taco Butt. Worked like a charm."

"You mean..." Still struggling to form words between laughs, Izzy wiped her eyes. "Oh my god, that's fuckin' wild. And he liked it?" 

"Well, actually," said Max, finally working up the courage to speak. "Not really."

"Oh, c'mon, sweetie." Again, Victoria chuckled. "You don't have to be embarrassed about it, there's no judgement here."

"I dunno about that," scoffed Izzy, visibly thrilled to be reunited with her favorite outlet for her natural domineering streak. "I mean, I'm not gonna pretend like he's not a little perv."

"What I mean is," said Victoria, turning around and shaking her huge, jiggling cheeks toward her stepson. "You know how big my booty is. It's not like anyone's gonna see you down there."

"Hang on," said Izzy, presenting her chest for the three-inch-tall freshman's benefit. "I think what Maxie was trying to say is that he doesn't want to ride in your boobs because he'd rather ride in mine!" 

Finally meeting his stepsister's gaze, Max froze. Judging by the telltale twinkle of sadistic joy in her eyes, he knew he had absolutely no reason to trust this offer. Then again, after a night in his stepmom's ass, the idea of spending any length of time with his face not pressed up against her giant asshole was pretty tempting. 

"Well," said Victoria, unable to keep from smiling at her daughter's irrepressible knack for messing with her stepbrother. "I suppose that could work, too. Max, what do you think?"