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This is a story that contains sex between an adult male, his son, and dogs.

If that isn't your interest, feel no need to read further. Please, no one under 18, and do not read this where it is illegal to do so.

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The full moon poured through the window. Bill's blood began to boil as his hands stripped his shirt from his body. His nerves were electrified, thick fingers drifting through this dark black chest hair. His hands fought with his belt and shucked his pants down. A surge pulsed through his gut as he bent to pull his jeans from his ankles. He doubled over, hands trying to fight with his briefs. His cock throbbed inside the white fabric, pulsing and spitting precum. He swiped faster, coordination failing, heart pounding faster as he let out a growl of unmatched pleasure. The thick chest hair grew rapidly, entire body sprouting in course black hair as his fingers began to fuse. Paw pads rose from his feet as they grew and extended, legs becoming haunches. His muscles surged with power as he gave into the base desires, crouched low as his cock strained against the fabric while his tail bone extended, stretching the elastic wider. His teeth clacked and snapped as his face extended out into a muzzle, the thick fur expanding from his chest and up his neck to cover his face.

The doorknob rattled. He swung around, surprisingly fast for a hulking beast. The door swung open as a young boy stepped inside. Those doe eyes widened, a soft whimper building in his throat as he let out a quivering whisper, "Dad?"

"Issac," he gurgled out, his voice barely able to form syllables with his new throat and face. The wolf could only fall forward, body surging as his spine curved. The tail shot out to full length, finally snapping the elastic waistband. His uncut cock pulsed, spitting a thick glob of precum onto the concrete floor of the shack. The fur grew up his shaft as the fat leaking head tapered in a ruby tip. The foreskin thickened into a sheath as the fur swept over his balls. The grew and plumped bigger, full and feral. He inched towards the boy as his ears creaked up to the top of his head, flicking with excitement. The boy stepped back, pressed against the door as the wolf threw his head back in a howl.

"You started without me!" The boy shouted. The wolf, fully transformed, only flicked his ears in return. Issac sighed, knowing that pouting wouldn't even register with the beast. He finished locking the door to their special shack and opened his backpack, starting to empty it. "Snacks and soda," he said, singsong, "and you can't tell me no because you can't talk." The wolf leaned in, big paw batting a bag of pretzels out of the boy's hand, rumbling softly. "Oh, come on," Isaac replied. "It's our holiday. Just for tonight?"

The wolf turned and stepped back to the oversize dog bed. He turned a few times, instinctively before settling down. Isaac took his spot there on the bed with his father wrapped around him. He wriggled back and forth to get comfortable before clicking on the TV. Bill let out a rumble, the light and noise a little strong, but he shifted his weight to keep his body against his son, against his cub. Isaac put on cartoons before breaking into a bag of beef jerky. He chewed a piece before offering the other half to his father, giggling as the big tongue licked up the scrap of meat from his palm. "You're the best, Dad. Even when I don't get to watch you shift," he cooed, stroking over those pointed ears and big muzzle.

Bill knew he wouldn't sleep, but he let his body relax, shoulder slack, tail swishing about in the dog bed. Isaac rustled around, sliding out of his clothes. The warm boyish scents filled Bill's nose. He fought the urge to snuffle and slurp as those soft fingers began to pet down his slide, resting on his sheath.

"Come on, Dad," he whispered, cooing in an irresistible voice. "You know you need it."

Bill was powerless to resist, nature urging him forward as his son's hands squeezed the heavy sheath, tip poking free. He whipped around and turned to the boy, teeth nipping and tugging at the clothes. "OK, Dad, OK," Issac whispered as he worked his shirt off before wriggling out of his jeans. A cold nose pressed up into the pouch of his underwear, snuffling all the those intense boy scents. Issac shucked down the briefs, letting his uncut little nail bobble free. Bill snuffled more, breathing it in as he began to lick and slurp as his son eased the hood back, letting that broad canine tongue work over the head. He fell to his back, pulling the stud canine atop him. Bill licked faster at the bouncing cock, rolling down over the boy's small, tight balls. Issac leaned up, stroking the sheath before slipping the ruby tip into his mouth. Bill bucked instinctively, pawing at the ground as the first spurt of canine cum filled the boy's mouth. Issac's cock throbbed to taste it, eagerly drinking it down as he eased his head back down, hand firmly squeezed behind the knot. The thick red cock slipped from his sheath, the knot rapidly swelling as the cum thickened, growing more potent. Issac swallowed as fast as he could, the spurting cock painting his face with a glossy sheen. Bill lapped faster as the boy's twitching cock as Issac let out a happy wail, body shivering and seizing from a tingling dry orgasm. The boy threw his head back, releasing the cock, watching it bounce and shoot, splattering his whole body in long ropes of cum.

Bill sat, heavy balls on the dog bed as the last few spurts fell upon the boy's upturned face. Issac swallowed and licked his lips again before working his way shakily back up. He threw his arms around the huge wolf, burrowing his face into that fur before giving a pleased little yawn. "You're such a good dog," he said coyly, evoking a soft growl from his father. Bill thumped his tail, the knot finally deflating enough to let his cock slip back into his sheath. Happy and sated, he turned around on the dog back, taking his position wrapped around the boy, before falling asleep. Issac took his position, wrapped in the safety of his father's embrace, and let his eyelids fall.

====

Bill's eyes, his human eyes, shot open and immediately closed. An ache filled his head like the hangover from Hell. The lights were too bright, the birds were too noisy. He eased them back open, looking at the naked boy nestled in his arms. His own uncut cock rested against the boy's lower back. He carefully slipped out from under him and stumbled to the door, bouncing cock leading the way, precum falling to the floor with a soft plip. He turned, bending over to gather his clothes. His head spun from leaning over, making him lurch as he bundled them under one arm. His skin was too sensitive to fight with putting on clothes today.

He unlocked the door and stepped outside, raising his hand to shield his eyes from the light. The morning sun fell upon his skin, the green of the trees surrounding him. The woods snaked a path forward, the little shed safely nestled away. Bill stepped forward, trying to push his cock back down before finally just relaxing, bladder releasing as piss arced from his cock, soaking into the dirt. Deep within him, a canine urge filled him as he began to turn, painting the earth with an damp curve, marking his territory, marking this place as his own. He sighed in relief, his cock finally relaxing as he began to walk back to the house. They had done this enough; Issac knew the path home.

The peace and stillness of the woods offered some relief. He adjusted clothing under his arm, finally breaking into a smile. He could hear the birds, able to tell where each was. There was the rustling of a stray raccoon and the scent of a local bitch in heat hanging on the wind. At last, he excited the tree line, stepping into the short manicured grass of his back yard. He wiggled his toes, enjoying the sensation of cool grass under his feet before at last stepping into the house.

Noisy claws clattered across the kitchen floor, sending shocks through his aching head as a German Shepherd barreled up to him. Bill tossed the boots and jeans to the floor, squaring his shoulders and growling. The shepherd immediately lowered his head and slowed, submitting to the alpha. "Come on, King. Outside," Bill rumbled, pointing towards the door. The shepherd bounded out again, through the door, happy to do his morning business.

Bill left the clothes abandoned and headed towards his bedroom. The house was modest, enough for himself and Issac. He stopped in the hall by the bathroom before moving on. A shower wound be nice, but his head was still too heavy to handle the noise. Issac's door was shut neatly. He preferred to give his son his privacy, but the boy ended up sleeping in his father's bed almost every night anyway. Finally, he stepped into his own bedroom and closed the door, admiring himself in the full length mirror. The days of the full moon nights were the best for him, his muscles a little stronger, his body hair a little thicker. His cock felt huge, girthy. A breeder's cock. He began to stroke himself, body so sensitive as he reached under those heavy balls to tease his hole.

"Fuck," he uttered, "I need to cum."

He sat down on the carpet and reached under the bed, pulling out the box of toys. He pulled out a rubber canine cock and bottle of lube. He poured the lube into his hand, heart starting to pound as he watched it slip through his fingers before stroking the thick toy. He worked up to his knees, watching his reflection as he smeared the lube over the toy, arranging it under himself. He sat down, hissing through his teeth as the rubber spade tip pushed into him. He squeezed, clenching around the toy as he began to slide down. He held that knot tight, lowering his thighs and sinking down on his toy. He pressed down against that knot, feeling it. It felt so wrong, so unlike the real thing. He wanted it swelling inside him, he wanted a steady tie. Still, his hole burned with yearning as he began to bounce, each down-thrust trying to take the rubber knot. He sad back hard, his hole flaring wide to swallow behind that knot, the stretch filling him deeper as he clenched down. He snapped his teeth, looking as if he could transform at any moment, before roaring out. His cock spasm before cumming hands free, shooting across the root to hit the mirror. He clenched tighter down on that knot, tongue falling out of the corner of his mouth as he came more and more, leaving streaks of cum on the carpet before posting up on all fours like a beast, cumming onto the floor.

"Dad?" a voice called from beyond the door. Bill panted for breath, body shaking, trying to steady his voice.

"Yeah?" he called

"I'm gonna start breakfast," came the reply. Bill worked up into a squat, gritting his teeth as the rubber knot popped free from him, the rest of the toy easily sliding out of his well stretched hole. He eased himself to his feet, looking at the mess he made. He grabbed a towel and began to clean, enjoying the dull emptiness in his hole as he worked.

===

After a thorough cleaning of the room, the toy, and his body, he pulled a robe over his shoulders and stepped back into the kitchen. His boy stood at the stove, just tall enough to use the skillet, having changed himself into a t-shirt and briefs. When he leaned up on his toes, the shirt would ride up to expose a bit more skin between his briefs and shirt. Bill smiled and settled in to his seat at the table, just as the boy served up eggs and bacon. He brought them to the table before sitting beside his father. The two enjoyed a peaceful morning as King milled about under the table, hoping for a dropped scrap.

"Dad?" he spoke. Bill knew from the tone exactly what he would ask. "When do you think I'll change?"

"Hard to say, son," Bill replied, chewing the bacon thoroughly, moving a bit slower as he settled in for all the usual questions.

"But when did you first change?"

"About your age. Maybe a little older."

"Did Grandpa help you?"

"Certainly did."

The silence hung a little longer as the boy let his feet dangle and kick, looking at the fork full of scrambled eggs before finally putting them in his mouth. Bill gave a sympathetic smile and rested his hand atop the boy's head. "It'll happen soon. Don't worry, cub. I'm sure." The warmth of his father's touch soothed him as he broke out into a smile. "Now, let's clean up after breakfast. It'll be another long night.

===

The afternoon droned on. Bill finally worked his way to the shower. Issac, instead, sat in his room. He stretched his hand out in front of his body, looking at it and studying it, completely human and ordinary.

King nosed the door open, pawing over to snuffle at the boy's other hand dangling off the edge of the bed. Issac smiled and dropped down to the floor, wrapping his arms around the big dog. He kissed that soft muzzle as King returned the affection with hearty slurps. The boy squirmed and laughed, face quickly covered in drool. He glanced towards the door, hearing his father still in the shower. This was no secret but it was still intimate and private. He wriggled out of his clothing, savoring the sweet feeling of fur against his skin. He reached down, the boy unknowingly just as much of a butt slut as his father. He pulled a stashed bottle of lube, nicked from his father's room months ago, and squirted it into his hand. He slipped a finger into his hole followed by a second. King began to prance back and forth, knowing what was coming. The boy rotated up to his knees and lowered his shoulders.

King took the initiative and jumped atop the boy, grabbing his hips. Issac moaned and cooed, holding the boy by the sheath and guiding him on target. He gasped happily, the dog driving in and pushing into his stretched hole. He reached back to pull that knot from his sheath, seizing it in his hand as the dog bucked away. Spurts of cum filled his body as he gathered the leaking cum on his taint into his palm before stroking himself. His body tingled and buzzed, making him drool. He knew better than to let the beast knot him. That cherry was being saved. He felt the knot grow in his hand, too big to be pushed in, and finally released, letting the boy take him full speed as he stroked himself faster. Without the knot, the cock continued to flood the boy hole and dribble down the taint. He milked faster before seizing, body tingling and twitching, a dry orgasm coursing through his body. He let out a happy moan and fell forward, the slippery cock falling from his hole. He turned around, slipping the tip into his mouth, drinking down the last few dribbles, just in time to see his father glancing at him through the open door. Issac gave a bashful smile, dog cum shining on his milk teeth. Bill chuckled under his breath before closing the door, giving the boys their space.

===

At last, night fell upon the house. The two walked through the woods, an electricity feeling the air. Bill's senses were acute, heart already pounding in his chest as he walked. Issac moved quick, almost in a jog to keep up with his father as they reached the cabin. They burst through the door as Bill immediately stripped himself naked again, the clothing far too binding, needing the air on his body. He squirmed, feeling his skin burn with sensitivity.

Issac tried to wait for his daddy to shift but couldn't help himself. He stripped down, naked body pressed to his father, standing on his toes and throwing his arms around those strong shoulders to pull him down for a sloppy kiss. Bill dropped down and Issac straddled him on his back, kissing wildly. The boy was already grinding and moaning, the tip of the cock that made him slipping around his cheeks, teasing at his hole. Bill squirmed under the boy; his body was getting bigger and furrier, transforming. "I want it inside," Issac groaned. Bill opened his mouth to object but only let out an animal growl. The tip pressed into the boy, spearing into the pucker. The tip grew slick, pointed, easily working deeper into him. The boy already bouncing on that growing cock, eyes fluttering from the gradual stretch.

The changing wolf moaned and growled, his body trembling as he lost his human form. His body hair thickened and grew, limbs curling as the change took hole. His cock began to spurt steady bursts of watery canine cum inside the boy, slicking the path, working deeper into him as the boy sat down harder, eyes wide from the new sensations.

Issac took over, showing surprising forwardness as he clenched around the massive cock, trying to work that knot in before it gets too big. Bill gnashed his changing teeth, muzzle extending, not used to being on his back as the boy pressed down harder, "Oooooohhh, Daddy's a good dog!"

A warning growl mixed with a human moan escaped Bill. His hips rocked, massive tail thumping on the ground. His fangs were bared in a wild grin, rough hands, growing into forepaws and rough pawpads, snagging the boy to yank him down on the throwing knot.

The boy let out a cry of pleasure and pain, the huge knot sinking in. The alpha wolf howled as his knot was played with like this, his cock releasing rich bursts of cum deep within his sweet son. The boy pulled up and out, relishing the pop from his hole before pulling up to his feet. Bill scrambled over, finally getting into a hunched posture, his body changing faster. The boy dropped down, getting on all fours at last, in proper position. His smooth skin was porcelain, smooch, the boy's voice throaty and tense, "Please, fuck me like a wolf!"

The feral beast panted and growled to see him getting in the right position. Human was forced out of his mind, only the animal remaining. Heart flooding with primal lust, he pounced his son and began to give jack-hammering thrusts, smacking his tip upon that smooth ass over and over. The boy whined, trying to adjust his position, feeling the slick tip gliding around his ass before finally hitting the mark, driving deep into his body. He roared out in pleasure, that huge cock slammed inside him, shaking and shivering.

He felt good. It felt better than than anything he had ever experienced in his life. He clenched down, his body flooded with all that alpha wolf DNA. He felt his father's massive balls swinging and swatting at his taint. He snapped his teeth, a low rumbling in his chest. He gripped the ground, watching that pail skin grow white, bristling with fine hairs. He shivered, gooseflesh rising, the hair, the fur extending. He opened his mouth to cry out in shock, only let out a garbled bark. He shook in pleasure as his hands extended into paws, his ears rising on his head into drooping puppy ears. His cock throbbed, growing into a ruby red wolf cock. His tail grew quickly from the base of his spine, pinned between his back and his father's belly. He let out a howl with all the force of his body. Bill drove forward hard, pushing his knot into his son, raising his head to howl together with the boy, transformed at last.

The feral mated pair filled the air with the yips and growls of animal pleasure with the father's massive knot tied and trapped within his son. He raised his head to the heaven's howling and pumping fertile cum straight into his son's new body.

Issac shook and shivered. He lowered lowered his head to his forepaws, panting happily, all worries and concerns a million miles away as he enjoyed his new powerful body, hips grinds and bouncing, squeezing and teasing that knot. Every tease made the powerful canine above him thrust and release more of that potent catalyst within him, their bodies powerful, their minds weak to desires and base instincts.

The boy panted and squirmed, young cock half hard, needing to FUCK, needing to BREED, his young balls churning and bouncing as his father unloaded spurt after spurt into his body, the powerful seed only making him more ravenous to cum. Not just a tingling climax but to CUM. He began to wriggle and tug, threatening to yank that fat knot from his tender hole.

The wolf above growled and grunted, pulling back as well, that knot yanking free with a loud painful POP! Seed gushed from the boy, quickly caught by his father's lapping tongue, working into that worn and stretched pucker, tasting his own cum.

Issac craned his new head around his shoulders, a snowy white wolf pup. He looked back at Dad with pride, the pride of a young stud, the son of an alpha. His cock throbbed and bounced. The boy pawing at the earth, low rumble in his throat. His father knew, his father could sense his need. It was inappropriate for an alpha to submit as such, maybe even for a father to submit to his son. But this was not submission. This was the love between family, between pack, and he knew how to celebrate his son's new form. He dropped down, turning, tail raised and hole exposed.

The boy nosed and nudged his father, observing him, taking in his scent. He leaped up, instinct taking over as he bucked and seized him with his forepaws before that tip hit his father's pucker, pushing inside with a needy grunt, starting to thrust deeper and deeper. Bill lolled his tongue, panting happily as his son engaged his first rut, pounding away, the young cock easily sliding into him. The boy growled in feral delight, humping and rutting faster, young knot starting to swell in his sheath, pushing forward, the hot and tight walls gripping around him. He look up to his Dad, his Alpha, his pack leader for permission, wanting to BREED, wanting to MATE, those balls jostling and churning. He slows himself, ready to pull out if his father were to growl and deny him.

The larger alpha wolf watched at how fevered and quick his son rutted, feeling those balls swaying. Checking was the best thing the pup could have done. He felt pride, he felt lust. He barked in pleasure, giving permission for the pup to make puppies himself

The boy gave into the feeling, hammering away, balls slapping before driving the knot inside his father, feeling it swell and build as fertile, powerful cum begins to empty into him, throwing his head back to howl, mating and breeding with his very first cumshot.

The boy panted, gasping, staying in position, before trying to turn on instinct, moving ass to ass with his father. Bill yanked forward, the young knot easily popping out before he turned and pounced on his son, pushing him onto his back to reassert his position. He straddled the boy, cocks hanging from sheaths, tongues pushing into muzzle, and hearts burning with pride.