Mick walks through the front door of his home with a sigh. He's had a pretty good day today, but he's certainly tired out from it. The 15-year-old fox climbs the stairs to the second floor and heads into his room to unwind.
Careless in his exhaustion, he neglects to consider if anyone else is home, and he leaves the door unlocked as he pulls down his pants, letting his mouse-like tail and three-foot cock loose into the open air of his bedroom.
In the next room over, his sister Dott, 13, is having a slumber party with two of her friends. The mouse giggles and squeals playfully as her friends bat after her bushy, fox-like tail.
Cindy, a 12-year-old calico cat, flails her legs in the air as she lays on the ground and reaches for Dott's tail. Rina, a 13-year-old stoat, pounces after Cindy's tail in turn, switching targets when Cindy least expects it.
The three young girls play for a while, giggling with glee, until Cindy excuses herself from the room.
"I gotta go use the bathroom," she says as she heads out of Dott's room, "I'll be back in a sec!"
The girl closes the door behind her and creeps down the hall. She'd said she needed to use the bathroom, but that wasn't quite true. There's someone she has a bit of a crush on who she'd really like to see.
CREAKKK
She cracks open the door to Mick's room, blushing heavily as she does so. She just has to see if he's home, maybe say hello, maybe...
FAP FAP FAP
Cindy audibly gasps at the sight beyond Mick's bedroom door. He has his enormous cock gripped in both hands, beating away at it intently.
Mick nearly jumps out of his seat in surprise, turning to look at the intruding child. He remembers suddenly that Dott is having her friends over tonight.
"Goodness, sorry, Mick," Cindy says sheepishly, "I- uh, was just looking for the bathroom... I couldn't help but notice you... uh..."
Mick rubs the back of his neck, embarrassed to have been caught masturbating by one of his sister's friends. "So, uh, bathroom's next door on the left..." he says awkwardly.
"Oh, uh, right..." Cindy trails off as she blankly stares at the fox's still-erect three-foot cock.
Mick glances away briefly then looks back to the little girl frozen in the doorway, "Uh... You're drooling... Do you really need to use the bathroom or... Do you want to come touch it?"
"Yes!" Cindy says a little too excitedly as she darts over to put her hands on Mick's cock. There are stars in her eyes as she rubs her little hands slowly up and down the length of his shaft.
Mick lets out a shaky moan from the feeling of having someone else's hands on his cock for a change. "You... really like my dick, huh?" he says to the eager calico.
"Mayyyybe~" she says as she wraps her arms around his shaft and hugs it to her body. She rubs up against it and watches with excitement as Mick's expression grows more and more pleasured.
SCHLRK
Cindy moves her left hand up the boy's shaft to the tip and begins to rub over it, only for her fingers to slip inside the urethra, then her whole hand.
"O-Oh wow..." she says, pulling on her arm a little and finding that it's not coming back out. Mick meanwhile is awash with pleasure, huffing and moaning loudly.
There's hesitance, then a question. "C-Can I go deeper?" Cindy asks sheepishly, her heart racing.
"Huff... Please," Mick responds, his eyes rolled back and his breaths shaky from the feeling.
Cindy steps back to pull the cock downward, and she sticks her other hand in with the first.
SCHGLRK
Her arms slide in quickly, and the hungry cock begins to pull her body ever deeper inside of it. Her nose touching to the tip, Cindy gives the boy's oversized dickhole a kiss before stuffing her face inside of it.
SCHLRRRKL GLRP
Her flat, undeveloped chest soon follows into the shaft, and shortly her entire upper body is inside. The girl's top half is completely surrounded by the warmth of Mick's member.
Losing himself in the feeling, Mick tenses his cock, and his erection lifts Cindy off the ground. Only her legs and rear end hang out of him, now, her tail nearly brushing the ceiling.
Gravity will do the rest.
"Rina, I'm hungryyyy," Dott says impatiently, "We should go get snacks." The little girl lays sprawled out on the floor, where she's been awaiting Cindy's return for a short while.
"Shouldn't we wait for Cindy to get back?" Rina asks, quirking an eyebrow.
"Don't you think she'd rather come back to a bunch of snacks waiting for her?" Dott asks.
Rina considers this, "Y'know what? Fair."
The two girls set out for the kitchen together, but they don't get far down the hall before they're distracted by the sounds coming from Mick's bedroom. With the door left open, they're able to turn just in time to witness Cindy's flailing legs disappear down Mick's shaft as he lets out his loudest moan yet.
"Cindy?" Dott shouts in surprise, entering the room with an incredulous expression. Rina shortly follows.
Mick feels hazy with pleasure, and it takes his clouded mind a moment to parse the two little girls entering his room. "Oh, Dott! I, eh-" he comes to the realization that his sister has just watched her friend disappear down his shaft.
Dott walks up, speechless, and puts her hands on her brother's balls, to which Cindy presses back up against her from inside. "You... You can do that?" she finally says, incredulous.
"Oh, uh, yeah, heh- Guess I can," Mick responds, rubbing the back of his neck.
Dott pokes her pointer fingers together, "Could you, maybe... Put me in there?"
"Me too!" Rina chimes in, emboldened by Dott before her.
Mick blushes, and his cock twitches slightly, "Oh, yeah, I can do that~ C'mere."
He pushes down on his cock with both hands to where Dott can more easily reach it.
"It's really big..." Dott says as she puts one hand on the tip, staring into the urethra. She takes a breath then stuffs her head in first.
SCHLRRK
Mick lets out a sudden moan from the intense wave of pleasure. 
Dott pushes against the ground with her feet to drive herself deeper into the soft, fleshy embrace of her brother's shaft. He can only moan more from the feeling.
SCKLRRK GLRRP
Once her upper body slips inside, Mick tenses up from the pleasure, lifting his cock and causing Dott to slip down into it. A great bulge runs down the full length of his dick and into his nuts below.
SCHGLRRKL SPLASH
She lands in Mick's balls with Cindy, and Cindy immediately tackles her, the two roughhousing around inside.
"Next time you run off to stuff yourself down my brother's cock, tell me!" Dott says with a giggle as the two tussle playfully, thoroughly soaking each other in Mick's cum.
Mick huffs and tenses up from the pleasure shooting through him as the two girls already inside play in his balls. Rina cautiously approaches for her turn.
The well-endowed fox is too overwhelmed to offer Rina any aid in sliding down his shaft, but the curious stoat takes her own initiative. She clambers up onto the bed and pulls his cock to the side, where she stuffs one foot in like a boot.
SCHGLRSHK SHLRK
"Ah~" Mick moans again as the little girl puts her other foot into his cock with the first and begins to slide down. He can barely keep his head straight and his eyes focused to watch the 13-year-old halfway into his cock above him slowly sink deeper and deeper in.
GLRRK
After a moment, the girl slides in past her waist, and with less resistance sinks up to her arms all at once, letting out a surprised, adorable squeak as she does that's barely audible over Mick's loud moan.
SCHLRK ULRK
The girl lifts up her arms slowly, exhilarated by the experience but wanting more, letting herself sink ever deeper into the stiff shaft. Her flat chest disappears into Mick's member, and her chin tilts up as she falls in past her shoulders. 
SCHGLRRP GLRP
With her arms up above her head, there's nothing to stop Rina from sliding all the way inside. A large bulge runs down the full length of Mick's cock as her entire body slips into the shaft and drops down the tube of soft flesh into his balls below.
SLORSH SPLASH
"Rina!" Dott exclaims, quickly splashing some of Mick's cum onto her face and lunging on top of her. Rina responds by splashing a handful of it back at Dott from beneath her, and with Cindy pulling Dott's tail, she's quickly overwhelmed.
The situation turns on Dott as Rina and Cindy both roll her over and hold her down instead, all three of the girls giggling playfully.
SPLRRRT
The soft walls of Mick's balls tighten briefly around the three as a thick stream of cum erupts from his shaft, a climax brought on by the sensations happening in the boy's genitals.
It'd be a tidal wave in comparison to any normal-sized orgasm, but for someone as blessed in the nethers as Mick, it's only a small spray of splooge.
Mick huffs and looks down at his still-squirming sack filled with the playful children, "Alright, huff... you've really worn me out here... I'm 'bout to head to bed."
FWIP SLOSH
"Hnngh... You girls behave in there, I'd like to get at least a little sleep tonight," Mick says as he rolls over in bed and curls up under the covers.
Despite the constant pulses of sudden pleasure from the three rascals inside of him, Mick is eventually able to relax and fall peacefully asleep. For that, the exhaustion of his day prior and of dealing with his sister and her friends certainly helps.
Mick drifts off to pleasant dreams.
KNOCK KNOCK KNOCK CREAK
The fox wakes up to the door to his room opening and his mother, Missie, entering.
"Mick! It's time for break- Oh my!" the pink mouse catches sight of Mick's enormous shaft laying across his chest and his very full balls, plainly visible through the unmistakable bulges they make in his covers.
SLOSH SLRSH
Hearing what's going on outside, the girls inside of Mick's family jewels start to wake up as well, squirming around inside.
"Ah~ Mh- fuck..." Mick can't help but moan as the girls' movements start up again.
"You kiss your mother with that mouth?" Missie replies jokingly to his profanity, "But really, though, do you need help with that, sweetie?"
"Er, yes, please," Mick replies.
The mouse walks over to his bed and pulls away his covers. "Alright, now just let momma take care of this~" she says, gripping the shaft with both hands and sliding her arms up and down it in a slow, smooth motion.
PLAP PLAP PLAP
Mick reaches down and presses his hands against the base of his shaft, letting the familiar waves of pleasure wash over him again.
Missie puts her tongue to the front of his cock just beneath the head, licking up it as she continues making long strokes with both arms.
PLAP PLAP PLAP
Mick moans louder as his mother continues to service his shaft, and the girls moving in his balls certainly help as well. Missie begins to get faster and more aggressive with her rubbing, prompting loud huffs from Mick.
PLAP PLAP PLAP
Mick's mother starts kissing over his shaft as she moves to firmer, harder rubs, able to tell from just the twitching of his cock that he's getting close.
PLAP PLAP SPLRRFRLRPRT
Right on cue, Mick experiences an overwhelming orgasm, causing a massive stream of cum to shoot up and hit the ceiling. The experienced mother angles his cock down, and all three girls tumble out of it one-by-one, as if they'd reached the bottom of a slide.
SPLLRRT SPLAP PLAT
The three land in a pile as the last strings of cum shoot out at the wall.
Dott rolls over, giggling and shouting "Again! Again!"
Cindy sits up to catch a bit of Mick's cum in her maw, gulping down a mouthful even at the risk of spoiling her breakfast.
Rina flops in front of the others and slowly gets up, stretching her arms and being unable to keep from laughing a little.
"Well, it certainly looks like you four have had a lot of fun," Missie says in the most affectionate of tones, "Go rinse off in the tub real quick, then you can go down and eat breakfast. I made you all pancakes!"
As Mick catches his breath, his arms flopped over his chest and his cock still twitching, Missie turns to him with a request, "Would you mind watching your sister in the bathroom? I don't want her and her friends making too much of a mess in there. They've certainly made enough of a mess in here~"
"Huh? Yeah, just- one sec... Huff..." Mick replies.
Mick gets up shortly after and begins to herd the cum-soaked little girls towards the bathroom.
"I'll clean up the mess in here, just take care of them while they clean up," Missie says. As the little ones hurry out of the room, she calls to them, "And don't take too long! Your breakfast will get cold!"
As the children head to clean up, she goes back downstairs to get a mop for Mick's room. It won't be the first time she's mopped the ceiling. It's a task she takes to with love, though; despite all the work, being a mom sure has its perks.