Story by Custos
(Original posting 28 April 2024 on https://inkbunny.net/Custos)

Please don’t repost this story, let it remain in my galleries!
This story contains material for adults only, do not read if you’re a minor.
The material presented is fictional and for adult fantasy only.
The author does not condone any of the depicted illegal activity in real life.

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Zikawolf commission: Healthy Growing Boy

Zika is in a good mood as he finishes cleaning his house and preparing the last finishing touches to sprucing up the place. The thirty-year-old wolf is going to babysit his nephew for the weekend and he’s gonna wear the term ‘fun uncle’ with pride!

The wolf is overall grey with black and red accents on his arms and tail. His head sprouts a tuft of red hair and the insides of his eyes are a mysterious hue of crimson themselves. He’s fit but not overly muscular. Zika likes to take care of his body and enjoys the looks he gets at the gym whenever he works out, especially when he displays his ‘hidden’ talent.

Jeffrey on the other hand takes a lot after his mother and not after Zika’s brother, with the eight-year-old little guy being an orange fox and the most gorgeous emerald-green eyes. Jeffrey, or Jeff for short, doesn’t even reach Zika’s navel yet, and the boy’s body is clearly more slender and feminine. One day, he’ll be a real heart stopper, and not only for his uncle who shouldn’t harbour such thoughts about his own nephew. Whenever Jeff is near Zika, the adult wolf’s heart just starts beating faster, eagerly obliging all the cuddles and hugs the young fox boy could want. He knows there’s going to be puppy eyes before long tonight, especially around bedtime, and subconsciously he knows the kid knows what he can get away with at his uncle’s house.

It’s a nice hot summer’s day, and because of the heat the adult grey wolf doesn’t think twice when the doorbell rings as he opens it in just his shorts. Immediately Zika is jumped by the energetic little ball of orange fur and energy, Jeffrey eagerly proclaiming:”Uncle Zika!”
The adult wolf in his thirties blushes a little as he can feel the little boy’s proximity in his arms against his chest, fumbling to keep Jeffrey from falling back down as he bounces the boy up against his body:”Wow, you’re getting big and heavy, Jeff! Guess I’ll have to work out even more to keep lifting you!”
The little fox boy giggles as he leans forwards and cups his uncle’s ear as he whisper shouts into Zika’s ear the way only little kids can:”Uhu! Very big, uncle! I’ll show you later!”

Zika’s hand is taken by his brother’s as the two men hug somewhat awkwardly with the little boy in between them, the other adult fox smiling at his sibling:”Thanks for taking him on such short notice, bro. The missus and I really need this trip. Just call if you need anything, alright?”
The grey wolf nods and grins as well, waving over at the beautiful woman sitting in the passenger seat of the convertible with the top down, equally dressed for a nice vacation of sun and fun. She waves back and blows kisses towards her little boy in Zika’s arms, Jeffrey just continuing to bounce energetically as his dad gives his brother some last-minute instructions. The other adult wolf then gently ruffles his son’s head and places a kiss on Jeffrey’s cheek:”Now, you be good and behave, Jeffy. Do everything your uncle tells you to do, finish your plate, and don’t stay up too late. Mommy and I will pick you up after school Monday, alright?”

Zika and Jeffrey wave after the little boy’s parents as they drive off before heading inside. Jeff immediately discards his own t-shirt to be in just his shorts like his uncle, always mimicking whatever Zika does as the boy idolises him. Zika just chuckles and ruffles Jeffrey’s head fur as he says:”You go on and put your stuff in the guest room, bud. Don’t forget to take out your swim shorts! I’ve put up a little surprise in the backyard.”
Jeffrey squeals as he rushes to carry his stuff up the stairs, whilst Zika walks into the kitchen and takes out some cans of soda from the fridge. The grey wolf looks out over the above-ground pool he’s set up in the backyard. There’s barely any room for the patio furniture anymore, and there’s just a little patch of grass surrounding it, but he’s managed to fit it inside his small yard.

Jeffrey gasps out in delight as he sees the pool, already shifting from one leg onto the other as if needing to go to the bathroom, looking pleadingly at his uncle when he gets down from upstairs:”Oh, wow! A pool! You’re the coolest, uncle Zika! Can we jump in? Can we? Can we?”
Zika laughs as he tempers the little boy a little, offering his nephew a can with soda:”Hold your horses, champ. First you need to get changed into your swimming trunks. Don’t need to have the neighbours see that pale full moon of yours!”
Jeffrey playfully swats his uncle’s arm at the mention of his butt and sticks his tongue out in that cute mischievous boyish way before dropping his shorts right then and there on the kitchen floor as he sorts out his swimming trunks.

The adult grey wolf’s eyes are glued to his nephew’s body immediately, with the boy completely oblivious as his uncle takes in his boyish goods. Though, boyish is the right word for the sheath is child-like with no hint of pink peeking out of it yet, its size is what draws Zika’s attention the most. It seems large for a boy his age, and thick. With Jeffrey’s balls larger and heavier than one would expect.

In a flash, Jeffrey has pulled up his swimming trunks which definitely still show a nice bulge for his age. The boy smiles up at his uncle, waiting for a few seconds before furrowing his brow and complaining:”Uncle? Aren’t you gonna change? I want to swim!”
Zika wakes from his reveries and chuckles, patting the boy on the head and quickly dropping his own shorts too as he pulls on his swimming shorts instead. He doesn’t want the boy to feel awkward about changing around other males, and if it weren’t for his physical interest for his nephew, he wouldn’t have thought twice about it either. Jeffrey’s eyes certainly dart towards his uncle’s goods too, but he just keeps smiling as Zika follows him outside. The wolf squints. He’s surely mistaken, but it seems like Jeffrey is a little bigger now that they’re outside. Must be a trick of the light.

The two play to their hearts’ content all afternoon, until the responsible adult inside Zika decides it’s been well enough, and the adult wolf carries the protesting cub inside. Once again, the grey wolf notes that Jeffrey seems to be a little taller and heavier than he has been before. For the first time, Zika starts to ponder about whether Jeffrey has inherited a special family trait that has been given down his bloodline for generations from father to sons. Seeing Jeffrey takes more after his mother, the wolf had never given it any thought, but seeing the boy reach just above his belly button now, he’s starting to doubt.

The man and boy towel themselves dry and put on some underwear, briefs for Jeffrey and boxers for Zika. The wolf orders pizza and the two of them settle on the couch to watch a movie Jeffrey isn’t allowed to see from his parents. It doesn’t take long for the cute little orange fox boy to snuggle up alongside his uncle on the couch, basically lying on top of the adult male as he rests his head on Zika’s pecs, his little fingers playing with the short grey fur of the wolf. Naturally, Zika’s arm cradles his cute little nephew and lands his hand on top of the boy’s thigh, giving it a few playful squeezes which makes Jeffrey giggle.

The sign has been given to the boy that intimate physical contact between the two males is okay, and the orange fox cub’s hands are starting to wander themselves. Of course, Jeffrey in all his innocence uses the opportunity to playfully tickle his uncle and to feel just how hard the pecs and abs of the adult are. Zika indulges his nephew and explains what the names of the muscles are that Jeffy is pointing out, flexing each of them, and explaining what sorts of exercises he does to keep them nice and big.

What Jeffy does next nearly fries Zika’s circuits however, as the impish little fox boy briefly pokes the enormous bulge of the wolf’s sheath through his boxers, giggling and joking:”And this muscle, uncle Zika? What exercises do you do with it?”
Rather than chastise the cub like a responsible adult, Zika can’t bring himself to do so. In part because he’s a free spirit who doesn’t believe physical contact between males, especially growing boys, should be demonised, but also in part because his nephew touching him on his own volition is like a pervert’s dream come true.

Zika chuckles along, making light of the situation as he flexes his cock inside its sheath, making the fat bulge in his boxers throb at Jeffrey’s behest, which makes the cub ecstatic with giggles:”All body parts need equal care, Jeffy. Maybe when you’re older I’ll show you.”
Jeffrey smiles at his uncle, the bulge in his own little briefs having grown in size. Maybe out of sheer contact high, or maybe because the cub seems to have grown a full head taller than he had been when he was dropped off. Or both. There is no doubt in Zika’s mind any longer; Jeffrey has inherited the family trait and he’s going to show the little boy that it’s okay and natural to have. To just run with it and have fun with it.

After pizza and the movie, Zika announces that it’s time for the bath before bed. At first there is a little protest as there always is from kids when they don’t want to do something boring like bathing, but when Jeffrey gets the idea that it would be much more fun if they would bathe together, the little cub starts pleading with the cutest of puppy eyes. Jeffy by now reaches Zika’s pecs already in height, yet the effectiveness of the puppy look remains unchanged and the adult wolf reluctantly agrees. Reluctant, not because he doesn’t want to, but because he doesn’t know if he’ll be able to control his urges if he’s presented with such an easy opportunity.

Jeffrey cheers in joy as he’s already flinging his briefs across the living room before darting upstairs towards the bathroom. Zika is treated to a nice view of the cub’s orange bubble butt as well as a peek at the boy’s package. What he sees floors the adult grey wolf with the red hair entirely, as Jeffy’s penis and balls had grown larger too. A fat cock that would put most adults to shame, thick and heavy, swings around above a set of full round tennis ball-sized testicles. The boy’s poor little briefs had barely held on before, and wouldn’t be able to fulfil their duty any longer until the boy would shrink again. The genetical family trait causes males to be able to grow in size, scaling up with the exact same proportions as they had before. If a male has muscles and a big cock, they too would proportionally scale up and become even bigger whilst still looking appropriate for one’s body. Zika has had many successes at the gym and on dating apps with his ‘talent’, and he’s over the moon that Jeffrey seems to have inherited the trait. The fact that the little boy seems unaware of it happening and unable to control it is normal as well, it’s like puberty; it’s all about self-discovery and things will point themselves out. Not to say that the adults in the boy’s life can’t help a hand, reasons the grey wolf with his heart aflutter.

The water is drawn into the large tub, Zika having had it built custom with his own growing talent in mind, and soon the adult grey wolf drops his boxers to comfortably nestle in the hot water. He too has won the genetic lottery as he possesses a hefty sheath harbouring a large black feral wolf cock, and big heavy balls that accentuate the furry pouch handsomely. Jeffy’s eyes are drawn to his uncle’s genitals and the boy seems curious. Zika knows his brother and his sister-in-law are free spirits too and do not hide their nudity from their boy, so Jeffrey knows what a man and a woman look like naked. But it seems the curiosity of little boys will always be piqued when presented with the opportunity to see more variety in the wild.

The orange fox cub steps into the tub with his uncle and wriggles around to find a comfortable spot in the lap of the adult wolf, Zika trying his best to think of less sexy things but quickly losing the battle. He reasons that if the boy shows any signs of being uncomfortable, that he’ll cover up and exit the situation, but that until then, he should just go with the flow.

Jeffy eventually settles on cuddling with his uncle in the bathtub face to face, the not-so-little-anymore boy’s stomach and large genitals grinding against Zika’s as the cub nuzzles his uncle’s neck:”Thank you for letting me stay, uncle Zika. And for taking a bath with me. You’re the best!”
Jeffrey reaches just below Zika’s chin now, the boy already the size of an average adult but his proportions still very much identical to before, which makes him look like an oversized cute boy. Zika embraces his nephew tenderly and gives him a nice squeeze for a hug, causing his fat sheath and the boy’s plump fat cock to be squished together as both of them throb to life:”Anything for my favourite nephew, kiddo. Love ya, Jeffy.”

The young boy’s body is acting on instinct as Jeffrey’s hips slowly start grinding into his uncle, the not-so-little boy’s hands clutching the fur on his uncle’s chest as his temperature is running higher. With each thrust against Zika’s fat sheath, the cub’s foreskin rolls back and forth over the large mushroom head on top of his dick, giving smooches to the opening to Zika’s sheath on each grind as the grey wolf is starting to see stars. His heart is pounding, the wolf overjoyed. Even if Jeffy doesn’t entirely understand what to do with his feelings for his uncle, nor the implications of the acts he is performing on his older family member, Zika can feel the love of the boy for him radiate through every touch, word, and gesture. God, he loves this boy so much. He would do anything for him. He would die for him.

Jeffrey is grunting a little as he grows to become face-to-face with his uncle rather than nuzzling his neck:”Ungh, uncle Zika. I’m feeling funny. My weenie is feeling funny.”
Zika soothes the young cub by embracing him firmly, pressing kisses to Jeffy’s cheeks and forehead:”It’s okay, champ. You’re a growing boy. Your body wants to try playing some adult games. If anything is too scary, just say so and we’ll stop.”
Jeffrey grunts and nods against his uncle as his big cub cock grows hard as a nail, the big meatus on the head winking in delights that are completely new to the boy but unable to produce any precum yet. After all, Jeffrey is still only an eight-year-old cub.

Zika gasps out as suddenly Jeffy’s swollen cock head finds and presses against the mouth of his equally large and fat sheath, the boy grunting in a slightly scared but innocently boyishly aroused way as his mushroom suddenly pops inside and is engulfed by the slick heat of Zika’s furry scabbard:”Ah, uncle Zika…”
The grey wolf with the red hair soothes the shaking but excited boy as he rubs Jeffrey’s back:”Shh, it’s okay, Jeffy. Doesn’t that feel nice and warm? It’s okay. You can explore me all you want. Your uncle loves you, kiddo.”

As the adult wolf continues to soothe and encourage the boy lying on top of him in the tub, now the same size as he is, Jeffrey’s hands start to explore more as the cub overcomes his trepidation and shyness. His large fingers find Zika’s sheath, giving the fat pouch a testing squeeze, causing precum to ooze out of the black lips of the sheath and all over Jeffrey’s shaft as the mushroom tip is still docked into it. The boy’s other hand reaches down further and starts to weigh his uncle’s heavy sac containing the hefty tennis ball-sized orbs producing so much precum the liquid is starting to push back up the cub’s urethra as Jeffrey’s fat dick remains lodged inside Zika’s sheath.

Feeling he can’t control his own growing erection much longer, Zika embraces his nephew tightly and starts grinding against the big boy whilst his hands firmly grip Jeffrey’s bubble buttocks:”That feels so nice, Jeffy. You’re such a big good boy. Uncle loves you.”
With each thrust into against the cub, Zika’s black feral wolf dick bounces against the slick mushroom head of his nephew inside his own sheath, the pointy top gently probing at the boy’s large meatus as it jets out precum copiously. Now it’s time for Jeffy to be the recipient of a dock, a dock within a dock as it were. The cub coos as the pointy tip of his uncle’s wolf cock penetrates his large meatus ever so shallowly, directly injecting the spurting hot adult precum down into the boy’s dick and balls. Transferring his masculine strength over into the boy, nourishing his growing body on his own, “Just… just a little longer, Jeffy. Uncle Zika is gonna… I’m gonna… Ungh!”

Zika’s heavy balls draw up in their sac as the adult wolf unloads jet after jet of hot wolf cum directly down his eight-year-old fox nephew’s urethra, directly feeding and nurturing the boy’s growing body as Jeffrey coos and whimpers out in a mixture of pleasure and discomfort. Regardless, the boy’s large body remains thrusting on instinct, Jeffrey’s hands clutching his uncle’s flanks as his thrusts cause Zika’s pointy tip to lodge ever slightly deeper inside the cub’s winking meatus as it thirstily drinks up every last drop of the adult’s semen, “Ah, uncle Zika…”

As if feeding the boy’s latent growing powers directly, each spurt of Zika’s sperm directly down into the boy’s balls causes Jeffrey to grow an inch taller, until the adult wolf’s balls run dry and the cub has ended up a full head taller than his uncle. The two of them barely fit inside the already oversized bathtub anymore, and most of the water has found its way onto the floor soaking the bath mat. Zika pants as he rubs the boy’s back and buttocks, the boy’s enormous body turning him on so much still even though he’s just finished ejaculating inside Jeffrey’s cock, which in turn is lodged inside his uncle’s sheath:”Ah, good boy, Jeffy. Such a good brave boy. Love ya, champ.”

The two cocks are withdrawn from each other, adult and cub’s, and Zika’s semen starts oozing up out of Jeffrey’s gaping cock slit. Almost as if the eight-year-old adult-sized cub is able to cum himself. Zika’s eyes grow wide as saucers and a tendril of drool drips down from the corner of his mouth, the adult unable to control himself as he leans down and darts out his tongue, catching the taste of his own flavour from his nephew’s cock. One day, he’ll be able to drink Jeffrey’s seed in exactly the same way. Zika wonders whether the boy would taste similar to himself, or more of his fox brother’s cum.

The two exit the bathtub and towel each other off, Zika giving answers to all of Jeffrey’s questions in a nice soothing voice as he explains all about a growing boy’s body, both literally and figuratively.

Jeffrey has grown so tall that he can barely fit through the door of the master bedroom. Zika had prepared the fold-out couch for the boy, but in his current state Jeffrey would probably break the flimsy piece of furniture if he laid down on it, so the uncle generously offered for his nephew to sleep with him in his bed with the reinforced frame. The oversized cub still looks as child-like as he did before, just scaled up taller than any natural adult has any reason to be, and still with exactly the same youthful boyish innocence and playfulness.

The big cub jumps onto the bed as the furniture creaks underneath his weight:”I have never been so big, uncle Zika! I’ve only grown a little bit at home. Dad says I’ll be able to grow really big when I’ll be an adult!”
Zika smirks as the boy confirms that at least his brother and his son have had ‘the talk’ about the family genetic trait. He wonders if they also had the conversation about puberty, which is somewhat linked with the growing trait, but Zika suspects they haven’t since Jeffrey is still only eight-years-old. The adult wolf wants to step into his side of the bed, but Jeffrey has already grabbed his uncle and lifts him up as if he were a mere child:”Look, uncle Zika! Now I can lift you!”
Zika lands on top of the still-naked cub, front-to-front, and is somewhat shy and humbled to find the roles reversed. Zika’s cock and balls are very large by normal standards, yet they are dwarfed by his nephew’s right now. Like the adult has become the child.

Zika chuckles and embraces his nephew’s chest with arms open wide, giving Jeffy a tight squeeze as he can’t help but grind his hips and groin back down into the cub’s enormous balls and dick:”Look at that, champ! Such a big strong healthy boy you are! You’re gonna be stronger than me when you grow up. What a stud you’ll be!”
Jeffrey blushes from the praise, his feet hanging off the oversized bed as he hugs back his uncle on top of him, returning the grinds upwards with his own hips as his own ‘pee pee’ had never gone down after the bathtub adventure:”Uhu. Just as strong as you, uncle Zika. With muscles as big as yours!”

Still spent from earlier but unable to ignore the flames of passion burning within his heart and loins, Zika crawls up his nephew’s body until they’re face-to-face again. The size difference is thrilling the wolf to no end, but most of all, the way Jeffrey still looks down at him with such admiration and love despite being clearly the strongest party of the two right now causes Zika’s heart to flutter. He loves this boy. He would do anything for him.

Zika smiles up at Jeffrey and gently holds his face from both sides:”As sure as the sun rises, bud. Would… would it be okay if uncle Zika gives you a kiss? A grown-up kiss?”
Jeffrey is clearly surprised by the question and doesn’t really know what it means, but he smiles, wanting to do anything for his favourite uncle:”Uhu. Sure, uncle Zika.”
The grey wolf with red hair closes his eyes and leans forwards as he puckers his lips, his mouth finding Jeffrey’s. The boy is clearly unsure of what to do and inexperienced, but also closes his eyes and tries to mimic what his uncle is doing. Despite the boy’s inexperience, or perhaps exactly because of it, Zika’s black feral wolf cock throbs to full length and emerges from his sheath against Jeffrey’s stomach. The wolf’s hands are reaching down, hefting Jeffrey’s balls which have become the size of small medicine balls, and just as heavy.

Then, the adult’s fingers sneak underneath and towards the very tight pucker of the boy, giving it a playful rub as Jeffrey gasps in surprise. Zika grins as he continues to massage the boy’s large tail hole:”Uncle Zika wants to show you how much he loves you, champ. Is that okay?”
The giant cub simply draws up his legs as he hooks his arms underneath his knees, presenting his oversized bubble butt and tail hole as well as his oversized hard weenie and very large balls to his uncle, his pucker winking in boyish anticipation:”Uhu. I’m a big boy now, uncle Zika!”