Old Dog, New Tricks
Alan bought a tribal necklace for his father's birthday, not realising that the silly warning attached, actually meant something.
Now, after a week of odd occurrences, his father has started transforming!
"Shit Dad, what's happening to you!" Alan exclaimed, as his father tore off his clothes, examining his body. The hair that had been gradually thickening over the last week had transformed from the wiry hair Alan was used to seeing cover his dad's frame, becoming like a pelt of fur. Although Mike hadn't removed his briefs, despite his awkwardly trapped tail, Alan could see his dad's bulge clearly, and it wasn't the one he was used to lusting after. Instead of the familar curve, Mike's cock was becoming more pointed, and was much longer than Alan ever remembered it being.
As his father turned this way and that, frantically examining his changing body, something glinted on his chest fur and the revelation hit Alan like a ton of bricks. It was the tribal necklace Alan had given him for his birthday last week, that's what the odd warning meant.
"Oh well," Alan thought, "too late to fix it now,"
Instead, Alan started to enjoy the show. Nobody else knew, but for years Alan had had two fetishes, the first was his lust for his dad and brother, the other was for half-human half-animals. Alan first discovered his love when he popped a boner during a werewolf movie. At first he thought it was because he was curled up by his father, but his fantasies and wet dreams soon started incorporating werewolves and various other animal men.
While Mike ran his hands all over his body, panickidly trying to figure out what was happening to him, Alan started to get aroused. The sight of his father's muscled body was normally enough to cause Alan to bone up, but now that his dad was turning into one of the animal people Alan loved to fantasise about? The boner in Alan's pants was nearly strong enough to burst straight out of his shorts.
Eventually, Mike began to calm down, realising that he was powerless to stop his transformation. Once the panic faded, another feeling started to overwhelm the dog man. He found his cock, which was already half-hard, growing more and more heated, and he realised that a certain scent was becoming more and more appealing. It was the scent that Mike had covertly been jacking off to for the last few days, the scent that came from Alan's dirty jockstraps.
Mike had always been a dominant man, but as he fell deeper and deeper under the spell, he wished more and more for his son's hard cock in his ass. Last night he'd even taken a carrot from the kitchen and, with one of Alan's jocks wrapped around his face, sunk it into his ass, cumming harder than ever before as he imagined his son dominating him.
That same submissivness grew stronger and stronger, urging Mike to give in, until finally the dog man snapped, and lunged for his son's cock, which was so endearingly outlined by Alan's shorts as it strained for freedom. The assault knocked Alan to the couch, his legs splayed with his dog of a father kneeling between them.
Alan yelped as his dad slid a thick hand up Alan's shorts, roughly fondeling his hard cock. Before he could push his old man off, Mike had started unzipped Alan's fly, fished out his diamond hard cock and had his mouth sliding down Alan's length.
"What are you doing!" Alan shouted as soon as his breath came back, although he made no effort to actually stop his dad. The older mans mouth slid off his cock with a loud pop.
"Why, don't you like this?" Mike asked, genuine worry crossing his increasingly doglike face, as his hands continued to work over Alan's cock. Alan knew he should stop this, that it was wrong, but seeing his dad's rough grizzled features eagerly slurping down his cock as they became more and more doglike had ignited something within him, and he quickly found himself shoving his father's muzzle back onto his dick.
Mike yipped as his son shoved him onto the thick pungent dick, unfurling his broad flat tongue along the six inch length, groaning as the glorious salty taste of cock exploded along his tongue. His new muzzle was perfect for sucking hot dick, and he did his best to do it justice, frantically slurping and sucking his son's length as Alan began to grip his ears, which had migrated to the top of his head, becoming perfect handles to hold onto while thrusting dick into Mike's slutty mouth.
After a few minutes of having his father lovingly suck his cock, Alan started to get close, so he pulled the dog man off, moaning as his Dad gave a last lick over his sensitive tip. Looking over his changed dad, he realised that his father had become a humanoid german shepherd. Between his dad's legs his cock junk had become identical to a regular dogs. Bright red and pointed, precum had begun to drip from the tip, making the eight inch long cock shine wetly. The knot was just starting to strain out of Mike's sheath, and his plump balls were drawn tight against his body.
Mike's fluffy tail began to wag as Alan told him to turn around, the new dominant tone in his son's voice sending erotic shivers through Mike's body. Once Mike had presented his ass, Alan spat on his fathers tight rosebud and began to rub the slick spittle into Mike's hole, his cock jumping as Mike began quivering and moaning as he was fingered. It didn't take long before Mike's hole was wet and glistening. Alan's heart hammered in his chest as he pulled his dad's ass slowly towards his cock head, the tip pulsating with his wild heartbeat.
"FUUUCK!" Alan exclaimed as his fat head plopped into his dad's muscular ass, sinking in slowly as the tight hole tried to accomodate Alan's thick cock. Mike whimpered as his virgin hole was stretched to it's limits, and full on howled when Alan's cock roughly bumped his prostate, which was slowly inflating from the massive load of seed that his heavy doggie balls were producing.
Alan groaned as his dad's furred cheeks slid down his hard cock, slurping up inch after inch of virile dick with surprising ease. Alan couldn't help but hump upwards, seeking more of Mike's wet, silky hole. One hand slid around Mike's waist, while the other wrapped firmly around the base of the dog-man's tail and Alan began roughly shoving his cock into his dad's slutty ass, making his man bitch moan loudly. Alan shifted forward on the couch, sitting on the edge so he could better slam his cock deep into Mike's man cunt. Wanting his son's cum to mark him as deeply as possible, Mike leant forward, bracing himself on his knees and splaying his legs. The change created the perfect pocket between Mike's fuzzy balls and his taint where Alan's marbles began to slap into loudly. As his cock grew impossibly hard, Mike wrapped his fist around his growing knot, tieing with his fist and howling as he started to cum, shooting string after string of thick doggy cum. Mike would have been surprised by his seemingly unending orgasm were he able to think clearly. Every time the flow began to wane, Alan's cock would hit his sweet spot just right, and he'd begin to cum anew. The pleasure almost became tortuous as Alan began to fuck him harder, and faster.
Mike began to whine as his son's dick pistoned in and out of his virgin ass, spewing hot precum into Mike's hole and hammering into his cum swollen prostate. Each thrust sent spikes of mind blowing pleasure through him, causing his entire body to clench up and his thick, knotted doggy cock to shoot another spurt of shepherd cum, splattering into his fur, along the carpet, and even across the screen of the television, which was now dripping with Mike's cum. Mike felt like howling, but the only sound he could make was a high pitch yelp every time his son battered his abused bitch hole.
Eventually the rhythmic milking of his dad's muscled hole became to much and Alan slammed his cock balls deep into his bitch one last time, arms locked tight to hold his dad in place as his dick pumped spurt after spurt of hot cum into Mike's already sopping ass. Had Alan not been holding him, Mike would've slid straight off an fallen to the ground, almost passed out in exhaustion, but still gripping the base of his dog cock tightly, keeping it rock hard.
Once he finished cumming, Alan's tiredness caught up with him as well and he found he could barely keep his eyes open as he wiped his dick on his father's backfur. Knowing they couldn't stay in the sitting room, in case Jack arrived home early, Alan hoisted his limp father up and stumbled up to his room where the two promptly collapsed onto the bed, soaking the sheets in sex juice. As he wrapped his arms around his already snoring father, Alan began to worry about the man's appearance, but before the thought could rouse him, sleep overcame him and he instead buried his face in the musky, muscled, fur pillow in front of him.