Baby of the Family

Baby of the Family


Anthony pre-emptively sighed as his phone nosily vibrated. Pulling it out of his pocket, he punched the power key already knowing what was inside. His parents were going on another business trip, and reminded him in their text that he was to keep watch on his little sister, Kaley, for the weekend. “At least call me next time...” he said to no one in particular as he stuffed the phone back in his pocket and quickened his step. Summer was starting to come in full force as the sun beat down like a broiler, and he wanted to get home fast.

By the time he was home, he was a sweat-drenched mess. Beads of sweat rolled down his face and fell onto the searing sidewalk below. Panting heavily, he walked to the door of his family's two-story house and burst in without so much as knocking. The cool air inside instantly enveloped him in a much-appreciated blanket of comfort.

“Jeez, don't come rushing in like that! At least knock!” A girl's voice called out to him: Kaley. She was only 15 to his 18 years, her long blue hair tied up into a loosely-flowing ponytail. She was lying on the floor in nothing but a t-shirt and a diaper. Kaley had been born incontinent, so the sight didn't phaze Anthony in the slightest. What did phaze him was that she was clearly wet, the massively thick undergarment discolored a deep yellow and expanded from absorbing so much liquid. Kaley paid her soiled state no heed, instead intently focusing on the video game she was playing.

“It is hot as hell outside.” Anthony grumbled as he throw his backpack on the floor. “And you're wet.”

“So?” Kaley's violet eyes lit aglow as she intently focused on her 3DS's dual screens. “I'm wet all the time.”

“Look, you and I both know how much of a complete tantrum you throw when you have diaper rash.” He sighed. This was how nearly every day went. Kaley's nonchalantness about soiling herself drove him up the wall. It was better than her being incredibly depressed about her condition, but she wasn't the one changing her diapers. “Get the stuff together for a change.”

“No way! I've been on my A-game all day long!” Kaley didn't even look at him as she spoke.

Anthony silently walked over to her and forcibly ripped the 3DS from her grip, snapping it closed with a loud clap. “Monster Hunter can wait.”

“What the hell, big bro!” She lept for the device, but he simply moved out of her reach and stuffed it in his pocket. Kaley's immediately punched him in the gut and began to scream, but her small arms barely phazed him. He simply stood there, motionless and with an exasperated frown, as Kaley threw every PG-13 insult in the book at him. “Why are you such a complete asshole!? Stop being so mean to me!”

“Stop wasting my time.” He emotionlessly replied. With a motion trained over years of living with her, he scooped up Kaley's petite frame, making her freeze in shock. “We're going upstairs, I'm changing you, and you're not bugging me ever again, got it?”

“STUPID BROTHER!” Kaley thrashed in his arms wildly and windmilled him in the face with her tiny arms. He sighed. It was going to be a long weekend.

///////

After the ordeal of changing his little sister, Anthony retreated to his room and fell on his bed, falling asleep nearly instantly. He remained in blissful sleep for a few hours, dreaming of riches, hot women, and not having an aggravating incontinent sister. Right as he was cruising the California highway in his Corvette, however, a loud voice rang in his ears. “Big bro!”

He was still half-asleep, and unable to respond. “...”

“Big bro!!”

“....”

“BIG BRO!”

Immediately after that ear-piercing shout something smashed straight into his chest with such force he woke up instantly, unable to breathe. He had no respite as something else began to pound his lungs like a jackhammer.  His lungs and ribs dully ached. Only after hacking and wheezing for nearly half a minute could he open his eyes and see Kaley kneeling on his chest. “What...the...hell...Kaley...?” She was once again wearing nothing but a diaper and t-shirt too short to cover even the waistband.

She smiled and leaned in further, her diaper crinkling. “Finally you're awake, big bro! It's nearly 6PM, I want pizza for dinner!”

“We had pizza last night...and your condition.” He didn't have the energy to move her off, her knees having blown the wind out of him.

“Who cares, I'm not the one changing my diapers!” She leaned in closer and hugged him tightly. “Don't you love your little sis and want to make her happy?” Their faces were so close they could have kissed. Her bare legs straddled his chest tightly.

She pouted adorably. “...Okay then.” She jumped off of him, making him sigh in relief as his lungs finally went back to normal. While he gasped for breath, she walked over to his side, turning her butt to face his head. Then, without warning, she lept back and came right down on his face. “I'm not moving until you agree to order some pizza!” Anthony incoherently screamed as her incredibly thick diaper choked him. He moved his hands to get her off, but she quickly countered with a threat. “If you touch me, I'll tell mom that you bullied me!” She squirmed and wriggled on his face, taking delight in how he had no choice but to endure the suffering. “Wanna get me some pizza now?” She asked with a devious smile.

“Nuh-uh!”

“Jeez, bro, I have to step it up, huh?” Kaley rotated so that she was pointing towards the bed's end, her legs now straddling his face. It was like she was riding him reverse cowgirl, only in a diaper and on his face. He still struggled, but unable to lay a finger on her for fear of parental punishment, he could do nothing. She shifted her weight so that it was all on his face, muffling his protests even further. “How about no, bro?”

Anthony said nothing, but was so aggravated he couldn't help but give her the middle finger silently. Kaley's eyes grew wide and her smile curled into an angry frown. “Wow, I really have to go this far, do I?” She felt a grumbling in her stomach, and smiled yet again as a loud, wet fart sounded from her rear, its acrid smell soon penetrating both of their noses. Anthony's cries stopped at this point, now aware of what would happen. She felt him shake his underneath her diaper and laughed uproariously. “You asked for it, big bro!” An even louder 'phhhhhhhhrrbt' sounded from her butt, before the true show began. As an incontinent person, Kaley didn't have to push at all—just relax as she felt a huge mass of squishy poop flow from her butt like a hose, along with a litany of loud flatulence. With little room to go it quickly piled up in her diaper, pushing on Anthony's face while also sticking to her butt. She giggled at the slimy and greasy feeling, wafting her nose as the first whiffs of the putrid stench began to work their way out of her diaper. With a devious smile she lifted herself up off of his face, feeling the poop now slide to the bottom of her diaper as more came in and packed into the new space. The diaper was starting to weigh much more and sag down as the mushy shit stained it a dark brown. Right as Anthony gasped for breath, she fell right back down on his face, delighting in the sensations as the poop slimily squeezed all over her butt, some even pushing up to the front till it touched her pussy.

By the time she was done, her diaper was now thrice its original thickness and so utterly packed that whenever she moved around the pile of squishy poop would quickly move into any free space. The entire room at this point smelled like a sewer, the fetid stench so thick that it forced its way into their noses, assaulting their nostrils till they could smell nothing else. “Aaaah~” She began to rub back and forth on Anthony's face, delighting in his screams. The mass inside her diaper rolled and shifted around with a chorus of disgusting 'squelch' noises, teasing her pussy until she finally orgasmed, her whole body trembling. Then she lept off of him and watched, her messy diaper hanging off her waist and pushing her legs apart, as he gasped for breath.

She got her pizza.

////////////

The two enjoyed their pizza (though Kaley ate all but two slices of it) by watching some movies in the living room. Kaley sat in Anthony's lap, curled up and hugging him, a fresh diaper now around her waist. Anthony had put her in an extremely-thick and absorbent night time diaper, so her butt was ginormous. Anthony could not deny that she packed a lot of warmth into such a petite frame, and that she looked adorable lying in his lap like that.

“Thanks for the Pizza, big bro!” Kaley shifted around in his lap and snuggled in closer.

“You ate like 90% of it...” Anthony patted her on the head.

“You're not mad at me, are you?”

“...You do that kind of stuff all the time. I'm used to it. ”

“Good!”

Anthony later retreated to his room upstairs, falling asleep blissfully. Kaley remained downstairs. An hour after he left, a buzzing noise rang through the living room's sofa. Confused, Kaley pulled back the cushions to reveal Anthony's buzzing phone, the name “RACHEL” on the screen. She grabbed it and answered the call with haste. “Heeeeeeellooo~”

“Oh!?” A woman's voice responded. “Who is this? I thought I called Anthony's phone?”

“Yes, this is his phone!” Kaley happily replied. “But I am Kaley, his little sister!”

“Sister...he never told me he had a sister.”

“He didn't...? Stupid brother!” Kaley pouted, while also feeling a grumbling in her stomach yet again. Those 10 slices of extra-cheese pizza were going through her and were about due to come out the other end. Of course she had no control, and with loud and wet fart began to dump another huge load into her diaper.

“Well...you sound adorable!” The woman was oblivious to what was going on.

“I'm 15!” Kaley moaned. She continued to dump more and more slimy poop into her diaper like it was the most normal thing in the world. The weight of her mess was already starting to sag the diaper, and she moved around a little to help get more and more out. It was clear this was going to be an even worse accident than before. The repugnant stench of fresh poop wafted into her nose, but she didn't care. She was so used to shitting herself that the smell barely bothered her anymore.

“...Huh. Well, I'm Rachel Willheim. I was gonna ask him if I could come over. I'm an...acquaintance.” The woman laughed.

Kaley snickered. “I think you mean giiiiiiiiirlfriend, right?” She stopped pooping, but it was only a few seconds before another tremendous fart ripped through the air and she began to shit herself again. By now her diaper was so thick she had trouble standing, the mess inside running out of spaces to pack itself into.

“M-maybe...don't butt in!”

“I'm sorry, it's just too funny! You can probably come over, I wanna meet you!” Kaley smiled, even as the shit in her diaper started flowing like sludge into the front. It was even starting to pile up in the sides, her diaper's massive absorbent finally reaching its limit.

“Okay. I'd like to meet you too, Kaley! You sound like a lot of fun!”

“Awesome!” Kaley joyously lept in the air, her massively packed undergarment pulling on her waist like a weight. When she came back down, the sticky mess inside greasily coated her crotch and butt completely, making her blush and lewdly moan. “Aaaah~”

“Uh...what happened?”

“Oh!” Kaley's face grew as red as a tomato, but she was so addicted to the feeling that she laid the phone on her shoulder, using her now free hands to grab the soiled diaper and press it against her nether regions. The squishy sounds only made her even more excited, her face flushing red from lewd lust as she pressed the poopy sludge against her skin as much as possible, feeling it slimily stick to her butt and pussy. She continued to play with herself, barely suppressing her moans. “Nothing! I gotta go to bed now. See you tomorrow!”

“Alright, I'll be there by around 2. Bye!” Rachel hung up, utterly oblivious to the situation as Kaley rushed to the sofa, the phone falling from her shoulder onto the floor. She lept onto the sofa and immediately began to squish and rub the mess in her diaper. deeply inhaling the putrid stench that only aroused her further. Right then she began to uncontrollably piss herself too, the two wastes combining into a soupy goo that completely coated her entire nether regions in wet, smelly, and greasy gunk. After finally rubbing herself to orgasm, she collapsed on the sofa, clad in nothing but a t-shirt and her soiled diaper, falling off to a deep sleep even as the rank odor made her eyes water.

Anthony was going to hate changing this one.