Brian's Breeding

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A short kink story involving Brian Griffin and 18-year-old Stewie.


All characters belong to their respective owners and are of legal age in this story.

Brian stood alone in front of the bathroom mirror, quietly examining himself with a paw firmly on his balls. Frustration was clearly present upon his face and he needed just a moment alone to collect himself. Over the last day, a heavy scent had settled into the house on Spooner Street, like a humid fog that only Brian seemed to notice. The scent had coated everything, and he felt as though it was constantly being pumped directly into his nostrils. It was a familiar scent, almost like a bitch in heat, but different somehow. It had left the poor family dog aching for release, but he couldn't find a moment to handle his lust, neither could he find where the source of the scent was coming from. He had mostly secluded himself as best he could, avoiding the rest of the family to prevent any awkward situations or run-ins while his sheath was just about always plumped with his bright red tip struggling to peak out.

He silently cursed to himself, he suspected it probably partially had something to do with the treatment Stewie had been testing on him for the last few years. Although he was an old dog, far older than an average life expectancy for a dog, he felt like a young dog in his prime and all thanks to Stewie and his wonder pill that seemed to halt and even somewhat reverse the effects of aging on pets. He hadn't quite figured out a viable treatment for humans, but Brian really wasn't concerned with it since his treatment had been a huge success. He owed a debt to Stewie that he felt he could never repay. As his thought wandered on Stewie, he sighed knowing his private time was about to come to an end. He washed his paws in the sink, dried them on the paw print towel Louis had gotten just for him, and made his way out the door. He decided he'd handle his needs that night, maybe in one of the spare bedrooms left behind when Chris and Meg had moved out to start their own lives. In any case, it'd have to wait. He had agreed to meet Stewie in his test lab to assist with some new experiment.

Brian made his way down the hall toward Stewie's room, still lost in thought. After he got over his terrible toddler years, Stewie had really grown into a much more pleasant kid and now a glowing intelligent young man. He had to admit, the kid was a genius and his aptitude for learning and understanding complex concepts had exponentially grown along with him. He truly thought the kid was destined for great things, hell, he would probably even change the world one day. His thoughts faded away as he opened Stewie's door. The once childish nursery had completely evolved and now was a neat and orderly young man's room. Bookshelves full of texts on various STEM disciplines lined one wall, a fairly nice office style desk sat against another. His crib was long ago replaced and then again upgraded with a standard full-sized bed, neatly made with red bedding. Unfortunately, the scent that had been assaulting his senses was equally distributed across this room as well. He feared he'd never get a break from it. Maybe a walk outside for some fresh air after his appointment with Stewie would do him some good?

The Labrador grunted and made his way over to Stewie's closet door, being very familiar with the secret waiting behind it. As he opened the door, he reach to his right behind a row of shirts and quickly punched in a short sequences of numbers on the hidden panel conceal behind them. "This kid is too smart for his own good," he thought as a hidden door slide open in the back of the closet, revealing a lift just big enough to fit two. Brian entered and placed a paw on the railing on one side as the lift began to slowly release it's brakes and make it's way down toward the secret lab Stewie had somehow engineered and built under the noses of Lois and Peter. Brian knew what to expect, he'd been down here many times to help Stewie with various projects, so it was no surprise when the lift stopped, opening up to a large sterile looking room. An assortment of equipment was placed around the room with different technologies in various stages of development. Metallic tables acted as staging areas and storage for all kinds of tools and gadgets and one wall was even dedicated to an impressive range of beakers, vials, burners, and other chemistry related instruments. In another corner was a full-sized bed, similar to the one in Stewie's room above, used by the young adult to take breaks when he became engrossed in his work. Brian himself had helped in the acquisition of some of these things, he really wanted to encourage the kid and assisted as he could.

As Brian stepped out of the lift, he noticed Stewie on the far side of the lab, working away on who knew what. He also noticed that damn scent, and it seemed somehow thicker down there in that secluded room. Stewie had heard the lift arrive and quickly tightened a bolt on a new device he was working on. Once he finished, he turned and greeted Brian, "Hey Bri, thanks for coming to help me out."

Brian noticed something seemed a little off with his friend, but he couldn't quite place it. Maybe he was nervous for some reason? "Of course, you know I don't mind helping you out when I have the time," he replied as he made his way over toward the boy.

"As you know, I'm heading off to university in a few month and there's one project I'd really like to finish before then." Stewie paused, almost as if uncertain, and then made his way over toward the corner of the lab that hosted the bed. "Brian, do you know why I developed your age regression treatment?" he asked while obviously avoiding eye contact with the dog.

Brian made his way closer to Stewie and paused to consider, "Well, I assume you wanted to create something to help prolong the lives of people's pets, right?"

Stewie tilted his head from side to side in a half agreement, "Well that is a positive, but that's not exactly why I did it."

Brian cocked an eyebrow in response, waiting for elaboration.

"Brian," Stewie spoke in a nervous tone, "you've been my best friend over the years, and you've done a lot for me. I--um, well I did it because I don't want to lose you, Bri. I did it because I love you, as a friend, but also more than that. I did it because I want to spend the rest of my life with you, and I don't care if people don't like it."

Brian was slightly stunned by Stewie's confession and took a moment to take it all in. It wasn't lost on him that Stewie had grown into a handsome young man and he'd be lying to himself if he hadn't snuck a glance here and there. He wasn't super vocal about it, but he himself was comfortably bisexual and had some experiences with other men. "I'm flattered Stewie, really," he started, "and I would be lying if I said I didn't have some feelings there as well, but you're still young and have your whole life ahead of you."

Stewie rubbed his arm and finally looked up at Brian, "I know what I want Brian, we've been together for years and the last few years have solidified that for me." Stewie sat on the edge of the bed and slowly removed the lab coat he was wearing, revealing his bare chest underneath.

Brian coughed nervously, but he couldn't help feeling a little stirring in his groin and that damn scent wasn't helping things. The scent? Had it grown stronger? He hadn't noticed it so much before, but the scent was definitely stronger than before.

"Brian, I love you and I want to be with you. That's why I wanted your help with this project," Stewie explained as he stood and quickly removed his pants, revealing no underwear.

Brian stood wide-eyed as he watched Stewie then climb up on the bed and present on all fours. Immediately the dog was hit with wave after wave of the scent that had been tormenting him. It was then that he noticed that where the boy's balls and cock should have been, was a swollen perfectly replicated canine vagina, and it was obvious that it was in heat. Brian felt a wave of heat wash over him, resulting in his burning red tip eagerly and lewdly jutting from his sheath. "Stewie, what did you do?" he managed to choke out.

"My project, Bri. I want to be with you for life and I want to have children with you. I want to bring you with my when I leave for college as a partner, not a pet. It took a lot of experimenting, but I was able to transform my own reproductive system into a female dog's. It's been so hard to hide this from you and I've wanted nothing more than to feel you inside me, this heat has almost been unbearable." Stewie spread his legs open wider and whimpered, "Please Brian, I need you."

Brian tugged at his collar for a moment and stepped forward toward the bed, drawn in deeply by the scent of Stewie's heat. "Ok Stewie, I can't say no to you right now even if I wanted to, but we're going to talk about this more later."

Brian placed a paw on his sheath and began to tug firmly, bringing his cock to full attention. He felt a flutter in his chest and realized just how turned on he was at the whole situation and he needed to bury his bone deep into something. He stepped up onto the bed behind Stewie, eliciting a needy groan from the boy. He quickly found himself behind Stewie's spread legs and inhaled the boy's scent deep into his lungs, sending a shiver through his body and a pulse through his still hardening cock. The dog brought his cock tip up to the boy's newly acquired and swollen mound, rubbing firmly around the entrance with spurts of his precum, marking his claim on his new bitch.

Stewie groaned out at the new sensation probing at his entrance. The hot tip of his dog's cock and the wet spurts coating his cunt sent him into a new level of ecstasy he had never experienced. At that moment he wanted nothing more than to be stuffed with the Labrador's dick and filled full with his litter. He moaned out uncontrollably as he felt Brian's tip slowly penetrate his needy hole and instinctively pushed back, allowing a few inches of the dog to slide into him. The hot pulsing member now pushing inside him and sending wild sensations through him was all he could focus on. He felt Brian's paws grip firmly onto either side of his waist, stabilizing him and guiding him back to fill him with more of the dog's thickening dick.

Brian's heart was pounding, this entire scenario was burning a fire deep inside of him that he had never felt before. Sure, he had filled his share of bitches and men, but the desperate need Stewie had for him and his length had him shaking with excitement. "Oh fuck yeah," he groaned out as he felt his cock sliding deeper into Stewie's passage and the eagerness of the boy to be filled had his cock throbbing harder than he had ever experiencing and he could feel the heavy volume of precum he was pumping into his lover. Stewie's groans and panting was driving him crazy and he quickly thrust the rest of his growing dick deep into his bitch. His knot hadn't yet started to full form, so he slowly pulled his cock back and slammed firmly into the boy, causing another series of moans and whimpers from Stewie. The boy was loving his dick and the dog was ready to give it to him.

Stewie could feel his hole squeezing instinctively, as if trying to suck the burning hot member as hard and as deep into him as possible. His cunt felt completely soaked with all the precum the dog was filling him with. Luckily, they were deep below the house, and no one could here him moan out like the hungry bitch he had turned himself into. It all felt very taboo and that turned him on even more. He badly wanted to be Brian's bitch and to be claimed by his fat cock. Stewie let out a lustful groan as he felt the dog began his conquest of his womb. He could feel the slowly growing knot at the base of each of Brian's thrusts into him, teasing his canine cunt each time it spread him open a little more. "Brian," he breathed out heavily, "take me on my back, I want to see you."

Brian grinned and slammed a few more heavy thrusts into the boy before pulling his engorged cock free of the boy's tight wanting hole. He took a moment to smear his cock all over the boy's mound and nether regions. "This belongs to me now," he groaned and carefully helped Stewie onto his back. Brian used his paws to spread Stewie's legs apart, revealing his wet cunt, leaking a mix of Stewie and the dog's fluids. Brian moved up and placed his throbbing and steadily growing knot on top of the boy's entrance, laying his dick up Stewie's groin area and stomach. "You like big dog dicks, don't you bitch?" he groaned out in a breathy gruff voice, receiving an affirming nod from the boy. "You want to get fucked and knotted with my big cock, don't you?" he asked, taking on a dominating presence over his new bitch.

With a loud moan and an eager nod, Stewie whimpered, "Please, make me your bitch. Fuck me full of puppies."

The Labrador shivered at the boys response and pulled his leaking dick back, aligning it with the boy's burning hole once again. "That's a gooooood giiiirl," he growled as he slide his full length back into the hungry hole. Brian pulled Stewie's leg toward him, wrapping them slightly around his own waist and placed his paws on the bed on either side of Stewie's hips, leveraging himself to pound as hard as he wanted. He once again began to slam his spurting dick repeatedly into the boy, watching the boy's face twist and wince in pleasure, pleasure that he was causing. Stewie's previously unpenetrated cunt gripped him tightly, working to milk out its prize, but he didn't want it to end so soon. The boy's tunnel was taking him on the ride of his life and he was thoroughly enjoying claiming his bitch and flooding his inside with his heavy spurts of pre-fluids.

Stewie could barely think anymore, he had been reduced to a moaning slut for his own canine companion. Every thrust brought wave after wave of ecstasy, causing him to pant heavily like the bitch he had become. He could all but feel every vein, every texture that Brian's dick had to offer and it was rubbing his doggy tunnel in all the right ways. Brian's breaths and low growls were sending him into a primal lustful frenzy. Stewie gripped the bed sheets tightly and leaned up slightly so he could see his best friend turned lover pound his fat cock over and over into him.

Brian looked up and locked eyes with Stewie, seeing that he was now being watched as he claimed his prize. He grinned lewdly and savagely slammed into the boy as deep as he could. He almost jumped in shock as Stewie screamed out in pleasure as he rammed roughly into the boy's cervix, his pointed tip penetrating just slightly. He felt the boy's passage grip him tightly, making it a little more difficult to slam into him like he wanted. "Loosen up bitch," he growled as he continued to thrust deeply. By now, Brian's knot was starting to grow close to full size and every thrust spread Stewie's entrance wider. As much as Brian wanted to keep going, he knew he wasn't going to last much longer. He groaned as he planted his cock deep inside his bitch, letting it sit and throb, teasing his partner. "Tell me how much my bitch wants to get tied and filled full of dog cum," Brian teased as he ground his cock into Stewie.

The boy cried out in another series of moans and looked up, face flush and red. "Please Brian, I want to take all of you. I want your fat knot locked inside of me. Please, fill me up with your puppies, Brian."

Brian grinned with full teeth and pushed in as hard as he could, bringing his tightening balls up against the boy's ass. He waited for just a moment as he throbbed and grew, his knot now firmly locked into his bitch. He pulled back slightly to make sure he was confidently tied and let out a breathy laugh as he saw the boy's mound bulging outward, keeping his full length, knot and all, trapped inside. "Get ready bitch, I'm about to dump a couple litters into your tight cunt," he said lustfully. The dog then continued to slam his hips hard into the boy, trying to bury himself as deep as he could. He could feel his balls starting to tighten and a familiar sensation tingling through his throbbing dick. "Here it comes bitch, your about to get knocked up by your dog," he grunted.

With a few more hard thrusts, Brian began to growl out loud as he ground the tip of his cock firmly at the boy's cervix, penetrating just slightly enough as he shot his hot load, painting the boy's womb full of potent dog cum. He could hear Stewie screaming out in pleasure as he closed his eyes and shot rope after rope of his puppy spunk deep inside him. Brian began to shake from the exertion and shifted his weight forward.

"Ooooh good boy!" Stewie screamed out as he felt his dog cumming hard inside him. He felt himself tighten around the thick cock inside him, milking it for everything it had as waves of intense pleasure crashed through his body. He could feel every pulse Brian shot into him and every throb of his knot locking them together. Stewie laid back onto the bed again, riding out the sensations overriding his mind. He placed his hand on his stomach and thought he could almost feel every throb from the dog from there.

Brian panted heavily, finally starting to recover from his intense orgasm. He pushed gently again into Stewie and let out a sigh of relief, "I hope you're not busy, I have a few more litters I need to dump inside you."