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"Subject R1, undergoing trial A-17. Administering injection now. Come here little guy..."

...

"...Three hours, and still no sign of a response..."

"Not a very promising start. The non-animal testing went so well too... Damn shame."

"...Where do we go from here?"

"We start over. More specifically, you clean up for tomorrow - and I go home and go to bed!"

"Wait, clean up?"

"Yeah, you know. Test plan calls for immediate euthanization and disposal of test subjects."

"What?! I don't remember reading tha-- Er, ahem, r-right. Of course."

"...Right. Well I'll leave you to it then... I'll see you in the morning."

"See ya..."

...

...

"There's got to be a better way..."

================

"Fuck it - I give up. That's just going to have to do for now." After turning off his computer monitor, Cooper went over to his bed and laid down on his front as he mashed his face into the pillow in an attempt to try and break away from what he was working on. It was shaping up to be another long day at work - and after realizing it was already well into the evening, Cooper knew that there would just be more work for him waiting in the morning.

Given his job as a software developer, Cooper had the luxury of a good salary and being able to work from home - but working from home oftentimes made it feel like he couldn't actually escape work. He wasn't a particularly outgoing fellow, though, and without many friends it was pretty common for him to use work as a place to spend all of his free time.

"Another day another dollar, I guess." he sighed, as he reluctantly rolled onto his side.

After a few minutes, which ended up feeling like a few hours, Cooper sat up and rubbed the weariness from his eyes. Knowing he still had things he needed to do today, Cooper got back on his feet and began making his way to the kitchen. On the way, he took a moment to examine himself in the mirror. The tan coyote looking back at him looked completely spent.

While he would normally be just a smidgen over 6 feet tall, Cooper noticed he was rocking a slouch that would easily betray that fact - and that it was clear had had once again ran himself ragged. Once again making a futile attempt to rub the tiredness out of his eyes, Cooper then spent a second to smooth out his disheveled fur as he looked to resume his evening routine.

Minutes later, and with his usual dinner "cooking" in the microwave, Cooper sat down on the couch and fished into his pants for his phone. After seeing all the unread emails he still needed to read (or god forbid, answer) he felt the all-too-familiar feeling of despair welling up in the pit of his stomach as he slowly began sifting through them.

Partway through the list of emails, one in particular caught his attention as he opened it and scoured through its contents. It was an advertisement for a bunch of discounts and deals for a bunch of local stores, including a pet store that was near the grocery he frequented. While the anthro population included a variety of species, there were a lot of other species that were still unintelligent/feral creatures that were sometimes domesticated and kept as pets.

"A pet, huh?..." Cooper thought, as he scratched behind his pointed ears. He knew he wasn't supposed to have any pets in his apartment, and that was usually enough for him to never even consider it. But today was different, he thought to himself as he wrinkled his furry brow in thought. As long as he didn't get any kind of large animal, who would even notice?

With his mind made up and after checking to see if the pet store was still open, Cooper slipped on his shoes and made his way over to see if he could find himself a new, and ideally inconspicuous, roommate.

================

The bell to the pet store rang softly as Cooper warily pushed open the door to the shop. "Okay - if we're going to do this, it's gotta be something small." he thought to himself as he began slowly going through each aisle.

"What about a bird?" he thought as he saw a brand of on-sale birdseed in one of the aisles. As though on queue, a loud ear-splitting squawk from somewhere else in the store quickly made him think otherwise. "Too loud... What about a fish, then?" he wondered as he looked over at a few of the creatures swimming around in a nearby tank. But after watching them for only 30 seconds, it began to feel like he'd already seen all there was to see - and that a fish would be a bit too low key.

As he made his way through the aisles towards the back of the store, Cooper had started to give up hope on finding a good fit when he suddenly heard a higher-pitched voice softly exclaim "Hey mopey, over here!". Looking around him, Cooper didn't see anyone else in the store outside of the teenager 'working' the register who was taking full advantage of the opportunity she had to watch videos on her phone while the day wrapped up.

"Hey fluff-for-brains, I'm talking to you! Over here in the cage!" the voice said again. The aisle Cooper was in had cages of all kinds of different small animals such as rabbits and guinea pigs. But one cage stuck out from the others, as Cooper saw a black rat with a white tummy standing on its hind legs, looking like it was winding up to throw something in his direction. Before he could even begin to process what he was seeing, he felt a soft tap as a small piece of bedding from the rat's cage struck him square between the eyes before bouncing off his muzzle onto the ground.

"Finally! I wasn't sure if you were going to need an extra hint." the rat said as it walked up to grab the bars of the small cage confining it, with an extra chunk of bedding in-paw.

"I...I don't...but..." Cooper stammered as he looked at the talking rat and tried to determine whether he was dreaming, sick, crazy, or any combination of the abov-- *tap* he felt again as another piece of bedding pegged him on his snout.

"Are you slow or something? Stick with me here, we don't have much time." the rat hurriedly squeaked. "Listen - I just got to this place today, and I have no idea who I am or why I'm here. But I know one thing for damn sure: I gotta get out of here."

With his brain catching up to what he was seeing, Cooper's pulse started to race. "What in the flying fuck" he whispered as he paced over to the cage and leaned down to meet the rat's gaze. "I...sleep deprivation, that's gotta be it." he said to himself, as he shook his head and began pinching himself on the neck in a desperate attempt to wake up.

"If you make me throw something else at you, I'm going to pick something a lot more unpleasant than the first two pitches" the rat snapped as he gently shook the bars of his cage. "Now focus up - we can talk more later, but for right now, I need you to bust me out of here. And keep it quiet. I need to keep the people who know about me to a minimum. I may not have my memory, but I'm smart enough to tell that I'm...different, given how unhelpful my neighbors have been." he said as he glared at a rabbit slowly chewing on a piece of cardboard in a cage across the aisle. "So can you help me, or--"

"Hey dude, we're about to close!" a voice interjected before the rat could finish its sentence. The voice had came from a few aisles over, and after a few seconds Cooper turned his head to see the teen previously at the front of the store turning into the aisle, swiftly followed by them shooting Cooper an annoyed look.

Looking back at the cage, Cooper saw that the rat was on all-fours and was chewing a small piece of cardboard in that same corner of the cage that he was previously using as a pitcher's mound.

"So, what, you want the rat?" the teen sighed, as she made her way down the aisle. "We just got that one today, so we don't have an info card out for it yet, but we got it from a lab working on, like, diabetes or some shit. So unless you're up for buying rat insulin, you don't want that one."

Looking back at the rat, Cooper could see that behind the cardboard-chewing facade, the rat's hopeful eyes were looking directly at him. "Um...uh, well, I think I do want this one? I mean, ye-yes - I think this one's the right one for me! Could you help ring me up?"

With one eyebrow cocked, the teen paused a moment before she gave off another exasperated sigh as she relented and began dragging her feet to the front of the store. "Fine, get its cage and come on."

Cooper then gently took the small cage by its handle, and lifted it up to check on the rat inside. Cardboard having been tossed aside, the rat was back on its hind legs and had its front arms crossed. "Well done - and definitely not conspicuous at all" the rat sarcastically whispered.

After awkwardly acknowledging the rat's remark with a grin and thumbs up that also conveyed a sense of I-have-no-idea-what-I'm-doing, Cooper lowered the cage to his side and hurriedly walked up to the front of the store with cage in-paw. Then, after paying the amount due and wishing the cashier a good evening (reciprocated, of course, with a blank/uninterested stare), Cooper put the cage under his arm and broke into a light jog back to his apartment to help get to the bottom of what the hell just happened.

================

Day 1

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After sneaking back to his apartment without any of his neighbors seeing him, Cooper proceeded to lock the door behind him and went to place the small cage on the coffee table in the middle of his living room. "Okay, we should be in the clear now." Cooper said, kneeling to once again be at eye-level with his new guest. "Welcome home!"

"Finally! Oh man, I sure am glad to get out of there." the rat said as he got back on his hind legs and proceeded to grab the bars of his cage. "So...uh...about this cage..."

"Oh! Right, of course! Sorry about that." said Cooper, as he hastily undid the latch mechanism that held the front of the cage in place.

Gently pushing on the front of the cage, the rat found he was met with no resistance as the front of the cage swung wide open. Stepping out of the cage, the rat took a deep breath and then proceeded to fall on his back and stretch out on the coffee table - exposing his white underbelly to the ceiling as he enjoyed his newfound freedom.

Feeling a mutual sense of relief, Cooper also opted to simply take in the moment in plopping onto the couch and leaning back. After a few minutes, Cooper chose to break the silence with introductions. "So... where do we go from here? I guess, to start, my name's Cooper." said Cooper, as he sat back up from his previously reclined position.

"Mmm...well, I suppose thanks are in order." the rat said, as he barely lifted his head to look Cooper in the eye. "As for what's next, I'm not sure, but I have some ideas... In either case, I'll be out of your fur here in a minute, just let me catch my breath."

"Oh - well, I mean, there's no rush or anything!" said Cooper as a worried look came across his face. "You're more than welcome to stay here for as long as you like. Or, y'know, at least until you're able to figure out what you're going to do next. After all, I was in that pet shop for a reason!"

"Thanks, but no thanks - I'm not interested in becoming anyone's pet." the rat said as he began to sit up.

"Ah, I'm sorry!" Cooper exclaimed, as he held his paws up defensively. "I didn't mean to imply I thought of you as my pet. You're clearly more than capable of looking after yourself. So I guess to be more clear: if you're interested, I'd love to have you here as my roommate - as my equal." he said, moving to kneel on the floor and get closer to meet the rat's eye level. You're obviously welcome to go whenever you'd like, but this way you can have a safe place to figure those things out, and knowing that I'm happy to help you however I can along the way."

Taken aback, the rat stammered for a second as he tried to process the unexpected reaction he got from the awkward coyote who just smuggled him out of that prison. "...I see. You know, this might just work out after all." he said as he looked into Cooper's eyes. "Yes... in fact I think this will do quite nicely." as he began looking over the coyote with greater detail.

"Absolutely! I'm just so glad to have a new friend I can talk to. " Cooper said, grinning ear to ear. "And I'd be lying to say that I wasn't even a little bit curious as well regarding your past. But that's something we can start looking into once you've settled in." Cooper's ears then perked up as he remembered just where his new friend could stay. "Actually... there should be a great deal of room in the cabinet by my bed, if you're interested. You can open/shut the door, it's low to the ground, and it should help give you some privacy."

"That sounds... fine..." the rat mentioned, still pondering something clearly unrelated to Cooper's suggested living situation. "Well, it's been a long day for both of us, so I'm going to get to bed. By the way, I know the pet shop probably had me listed as 'Snowball' or some shit, but you can call me... Ren. I think I like that name - it feels... right."

"Sounds good! Well I'll talk to you in the morning then, Ren!" Cooper mentioned as he went to the bathroom to get ready for bed himself.

================

Later on that night, Cooper woke to a creaking sound coming from the wooden cabinet next to his cabinet. Figuring Ren had just gotten up for a midnight snack, he rolled back over to then hear another loud creak followed by a snap only minutes later. Startled awake, he looked over to find that Ren was now suddenly larger than a bread box in size, and had grown to the point where his foot had broken through the wooden backing of the cabinet.

"Holy shit! Ren...what even?!" Cooper exclaimed, helping him free his foot from the broken cabinet backing.

"I don't know! I woke up earlier to get, er, just a little something... to eat from your pantry, and then went back to bed! Maybe this has something to do with the lab that they said I came from. What were they doing to me?!" Ren said, now standing at knee height when compared to Cooper.

"I have no idea - maybe they were trying to make you like us; like normal anthros." Cooper said as he scratched his head. "By the way, what exactly did you say that you ate?"

"Oh. Well... you know, it had been a while, and I hadn't eaten much at the pet store. It started out with just some crackers, but well..." Ren said, averting his eyes.

Concerned by Ren's careful omission of details, Cooper then got up and went to the kitchen to find that the entire lower section of the pantry had been cleaned out. With not a crumb left, it was clear that some kind of feeding frenzy had happened overnight while Cooper was asleep.

"Uh...wow. Looks like I'll need to stop by the grocery store tomorrow. Maybe this is linked to your growth spurt though - where your body needed all these calories to fuel your growth/changes..." Cooper pondered as he bent over to start cleaning up all the empty packages and wrappers strewn around the kitchen floor.

"I don't think this is how much I normally eat..." Ren said, rubbing his stomach. "Is it bad to say that I'm still hungry?"

"Well that's not good. I know it's painful, but let's avoid any 'feasting' until we can figure out more tomorrow." Cooper sighed as he looked at all the food he'd need to restock in the morning.

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Day 2

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In the morning, they awoke to find that no further growth spurts had happened, thankfully. Cooper then left Ren to use his laptop to look up the lab that the pet store had mentioned, while he went out to go replace the groceries that were devoured last night.

After a few hours, Cooper returned - arms filled with bags of groceries and other sundries to replace last night's impromptu feast.

"I'm back! Hey - let's put your growth spurt to good use and you can help re-shelve some of th--" his sentence was cut short, as he saw Ren surrounded by wrappers and boxes from the rest of the pantry/fridge, and that he had since grown to chest height in the short time that Cooper had been gone. Furthermore, Ren had clearly undergone a more severe transformation, to where he apparently had taken on the muscular/bone structure of your standard anthro rather than that of a common-place rat.

Staggered, Cooper dropped the groceries that were currently in his paws and then moved to slam the door shut before anyone could see the five-foot tall rat anthro in his apartment. "What the hell?! I thought we said we were going to chill on the eating until we figured out what was going on!" Cooper intensely whispered.

"I tried! I really did!" Ren said, looking down guiltily at all the food/wrappers strewn about. "I was looking up information on the lab, and had managed to narrow it down to this place performing 'small animal enhancement experiments'. But then the next thing I knew, it was almost like this intense... instinct had taken complete control." he said as he worriedly rubbed his head. "I don't remember much else other than repeatedly making trips back and forth from the kitchen, and then the next thing I knew... well..." as Ren then gestured to his newfound body.

Cooper stared back at Ren in awe, as he came to the realization that this almost anthro-sized rat had eaten everything available in the apartment. Looking down to take inventory of what all was lost, he also noticed that Ren was completely unclothed - and given his new size and shape, it was evident to see that his new roommate was particularly well-endowed. Ren's now quite-large cock was barely poking out from its sheathe, with two large furry balls just behind the rodent's member.

"Erm... I don't mean to... It's just - did you want to borrow some of my clothes or something?" Cooper stammered, suddenly looking up and away from the lewd display in front of him.

"Wait, what for?... Oh..." Ren noticed as he looked down and came to the realization that his being nude was a bit less appropriate now that he was nearly the same size as most anthros.

"... Actually," he mentioned as he stood up and began walking closer "...the eating thing isn't the only...instinct I've been fighting. You see, we rats live in colonies..." he said as he paced closer and closer towards Cooper, who was still looking up at the ceiling. "And even yesterday - every fiber of my being was telling me that since I'm not in one, I need to start making one."

"I... I... What are you saying?" Cooper stammered, still averting his gaze.

"I'm saying that I've looked through your computer, Cooper. I've seen the medical documents verifying your status as a carrier of the breeder gene, and I know that right now you're thinking about how you'd like nothing more than to become the carrier of my pups." Ren slyly whispered as he began stroking his growing member, coaxing it slowly out of its sheathe.

"I... I don't know what you're... I'm not..." Cooper said as he wrinkled his muzzle and closed his eyes while shaking his head in denial. "I never asked to be a b...breeder" he hesitated, never having said the word out loud to anyone other than his doctor. "But I can't stop thinking about it... starting a family, becoming filled to the brim a stud's big litter..."

At that point, Ren's musk had permeated the air, infecting Cooper's senses and rapidly stripping him of all reason. Ren reached over and put his paws on Cooper's shoulders, gently guiding the nervous coyote to his knees. "Sorry, we rats aren't exactly known for foreplay. What do you say - care to help this lab 'accident' start his colony?"

"...Mmh... I don't..." Cooper stammered as he opened his eyes to find Ren's cock dangling tantalizingly in-front of him, with his virile orbs swaying just behind it. "Ye...YES, I... I need you to fuck me. To put your litter into me! I need to become pregnant with your litter!" Cooper nearly shouted as he gave into his carnal desires.

"Good boy. Now that's what I like to hear." Ren said as he licked his lips. He then spun Cooper around and aggressively pushed him onto all-fours, as he helped Cooper rip off his clothes as he then pushed Cooper's tail out of the way and moved his fully-erect cock closer to Cooper's eagerly awaiting hole.

"... Can...can you be gentle? This is my first time, well... doing anything like this." Cooper mentioned just before they started.

"Now now - don't sell yourself short. You were made for this, my friend... No... my love." Ren said to soothe Cooper's reluctance. He then took his cock and began slowly engulfing his genitals with Cooper's rear. Briefly wincing, before Cooper could get a better look at what's happening behind him, he found Rem's body forcing him down in domination.

"Oh-oough!" Cooper whimpered as he took the entirety of Ren's length. It was clear that Ren was letting his instincts take control, as he began with a few slow lifts and drops so he could find a steady rhythm for his body. The rat then accelerated his humps as Cooper laid on the floor, no longer holding any control in the situation.

"Mmmh, yeah... You're so... fucking tight." the rat said in-between thrusts, as he got closer and closer to cumming directly inside Cooper, knocking him up and filling him with his abundant offspring. "I've been pent up for so long... I hope that means we get a lot of bang for our fuck here, and get a good start to our colony."

"Ah... do it! I want to grow so big and fat with our children! And then...those children are going to need siblings! And then they'll need more siblings too!" Cooper moaned as he continued to get speared by the fervently fucking rat behind him. Meanwhile, the rat's rapid thrusting and penetrating musk triggered the release of the eggs in the breeder's womb - with multitudes awaiting the anticipated delivery of sperm that was imminently inbound.

"That's what I like to hear, bitch." At that point, Ren began to thrust at a much faster pace than before, finally allowing his pent-up payload of virile rat-baby batter to begin its flow. Completely lost in hormones, Ren finally got the push he needed to cross the line and start cumming. Copious amounts of cum explodes its way into Cooper's hole, filling him with an overabundant rush of genetic material that began its work in hunting for the eggs to make the rat's brood.

Cooper's body slacked once Ren pulled out after spending the next several seconds releasing his seed. With his front slumping onto the ground after his limbs gave out, he looked back at Ren as they were both panting and smiling. He could practically feel each released egg rushing to meet the pumps of seed that were just released into his womb.

"Ha...you know..." Ren said in-between pants "I think you'll like being constantly knocked-up with my spawn."

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Week 1

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"Oof..." Cooper exclaimed as he set down the last few bags of groceries on the kitchen counter. He had to take this opportunity to buy everything he would need for the coming weeks while he could still pass his pregnancy off as just a beer gut. But in the past couple of days, there was pretty much no hiding his condition from the rest of the outside world.

It had only been one week since Ren had taken over, but the results of their first mating were already quite apparent. Cooper had already swollen to the point of looking as though he was entering the third trimester of a normal pregnancy, but Ren knew better than to assume that his spawn were due any time soon. Almost all of his shirts and clothes would no longer fit him. Unzipping his clearly stretched-out hoodie, Cooper revealed that his shirt had completely ridden up to his chest and had nearly torn due to the swell of his gravid middle.

"Hurry up and get that shit put away. I need you to start making dinner - I'm fucking starving." Ren called out from the other room. Ren's growth throughout the past week continued, though at least had started to slow. He had now passed Cooper in height, and easily cleared being at least 7 feet tall.

"I'm...starting to get a little worried Ren. Are you sure I'm not about to go into labor? I'm getting quite big..." Cooper said as he started unpacking the large quantities of food, with one paw idly on the rounded dome of his tummy.

"Have you felt any movement or kicks yet?"

"Well...no...not yet."

"Then you're fine." Ren said as he waved his paw dismissively. Cooper had looked up and found that rats had around a three week gestation period normally - and though he seemed to be sticking to that same time frame, he was growing increasingly concerned about his rapidly swelling middle.

"Well okay then. So what have you been up to today?"

Ren had been spending the past few days doing more research on Cooper's laptop, but this time not on the lab where he originated. He no longer cared about his origins, and instead was focused on something much more important: real-estate. The apartment could be suitable for the first couple of litters, but he had more than that in mind for their growing family. Much more.

"I found it: A small house about 40 minutes outside of town. The nearest neighbors are more than 20 minutes away. It's perfect."

"Oh, that sounds nice. It'll be the perfect place to watch these little ones grow up." Cooper said as he rubbed his more-than-pronounced middle.

"I hope you don't think we're stopping there - I wasn't kidding when I said that we're making a colony. Once we're out there, I'm going to start making some serious renovations." Ren said, with a devilish grin starting to form on his face. "Gotta make room for all the pups, after all. Speaking of - did you get that thing I asked for?"

"I had to go to a few different stores, but yeah I eventually found it. 'Fertillix', right? I don't understand why you had me get this fertility stuff - I'm clearly already pregnant."

"I don't think you get it." Ren said as he got up and went into the kitchen. "My plans for us aren't to have just a family - and not even just a 'large' family. Oh no - I want you constantly filled to the brim with as many pups as you can possibly carry until the end of your days. And if there's any method for us to get a jump-start on my vision, we're going to damn well take it."

"Mmmf...o..okay" Cooper stammered, as he looked down and saw that Ren's cock was once again unsheathed, and that his overwhelming musk had followed Ren into the kitchen - causing Cooper to lose track of anything other than the idea of pleasing the rat.

"Good. Now starting today, I want you popping those fertility pills like they're goddamn candy. Now then... while I'm in here, bend over. Having you out of the house all day has me seriously pent-up, and you're about to take care of it." as Ren reached over and began rubbing the dome that contained the start of his and Cooper's legacy.

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Week 2

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"Unbelievable." Ren muttered as he dejectedly tossed the closed laptop computer on the couch and began to pace around impatiently throughout the living room. "30 days, maybe more, for the paperwork to go through on buying that stupid house. I'm going to die of cabin fever long before then."

"Come sit down!" Cooper beckoned from the bedroom. "Walking around isn't going to help things move along faster. Besides - you're going to piss of our neighbors."

It was at that time that Ren realized that his pacing was, indeed, becoming quite conspicuous. Having had another growth spurt over the past week, he found himself almost 8 feet tall and with the thunderous footsteps to accompany such an increase in height. Taking a moment to pause and think, Ren conceded that there were likely better uses of his time, and walked his way to the bedroom.

"Hey stud - come lay down with me." Cooper said as he patted the small amount of remaining space in front of him as he continued to lay on his side and idly rub his belly with his other paw. It turned out that Cooper had done his own fair share of growing over the past week, and had progressed to the point of where anyone else would mistake him for being overdue with triplets. The pups had recently began moving, and with such a large belly it was quite easy to see the occasional shifts made by the couple's spawn as they continued to stretch and grow within Cooper's womb.

"You're kidding, right? There's barely enough room for you on there, much less myself." Ren said as he went up to the side of the bed and gently placed a paw on the heaving belly in-between him and his mate. "Looks like they've started moving. Not bad... I think it's going to be a litter of, what, 7?"

"I don't know, it feels like more than that sometimes." Cooper said as he stretched his arms as he tried, and failed, to touch his now-outie belly button. The tan fur that covered his stomach had begun to grow increasingly thin as the many pups within forced his belly taut, resulting in an almost pinkish hue from the stretched skin underneath.

"Fine, so maybe 8 or something, it just means we're getting a good head start in the beginnings of our family." Ren said as he moved his paw to a particularly active bump. "Strong kicks - they're going to be quite active. We need to get to that new house soon so we can continue to increase our numbers."

"Everything in due time." Cooper said as he carefully sat himself back upright and checked the bed for any wet spots. He had stopped wearing shirts around the house for multiple reasons: one of course being the swell of pups occupying his womb, but the other is that his formerly just-sensitive nipples had also recently begun to lactate. Even though he had no proper breasts, his status as a breeder meant that even a male such as him would be equipped with the milk needed to feed his young when the time came.

With (mostly) ample space being freed up on the bed, Ren took it upon himself to try and sit next to Cooper. A dubious creak could be heard as the underlying frame struggled to support the large rat and the equally large broodfather of his young, but ultimately it was able to hold up to the task.

"We ought to start storing your milk. Our brood are going to need plenty of it before they're able to be weaned." Ren said as he saw an idle drop of milk drip from Cooper's chest and then run down his massive front.

"You're probably right... I just can't stand to try and pump my, well... you know," Cooper trailed off as he motioned towards his two leaking pecs with his paws. "It's just so weird, and I've never done it before."

"It will become second nature in time. It's quite likely that, as our brood continues to increase in number, you will find yourself continually nursing in order to meet the needs of our young." Ren said as he ran his paw along the prodigious mound carrying his offspring. "Until then, I think I have an idea..." He then moved to place his paw on top of Cooper's as he then moved his head over closer towards the Cooper's chest.

Cooper then shut his eyes and grimaced as he braced himself for the unknown sensation of having something, no, someone directly partaking of his milk. However, as Ren's mouth met the exposed nipple and began suckling, Cooper felt an unexpected rush of relief as the backed-up tension behind his flowing nipple began to be released. The sense of relief, combined with the pleasurable feeling of having the father of his children so close, also made his cock swell with the thought of being able to relive this experience over and over in the coming years.

"Ohhh - holy shit... that feels so much better." Cooper moaned as Ren continued to suckle from his teat. All the while, Ren was still continuing to gently rub his paw against the burgeoning womb in front of him, taking pride in both the size and number of the litter currently occupying said space.

After an ample amount of time, Ren, having gotten his fill, lifted his head and wiped his mouth with his paw. "Ahh - that will do quite nicely for our growing pups."

Cooper, after opening his eyes and taking a moment to recover, proceeded to wipe the excess milk off the fur on his chest. Just as he was about to stand up, he was then caught off-guard as Ren moved his paw to underneath his gravid middle and grasped his erect member.

"Let's see if there's another kind of pressure I can help relieve, while I'm at it." Ren said slyly as he began stroking his partner's increasingly swollen shaft. Faster and faster, he ran his paw along the entire length of the dick that was now entirely hidden by the brood of pups positioned above it.

"Mmmmf... More... I want you to fill me with so many more pups..." Cooper moaned, as he leaned back and accepted that his cock was at the mercy of whatever the rat had in store for him that evening.

"Believe me, I'm going to leave you so full of pups that you won't be able to move." Ren proclaimed as he picked up speed in rubbing Cooper's cock. "As soon as you birth this litter, I'm going to full you with another one right after that - each round of pups being even bigger and more numerous than the last."

"Ah, yes! I want-- no, I need more! Our family will be enormous!" It was then that the rat's actions forced Cooper to shoot his load all over the bottom of his immensely pregnant globe of a belly. In-between the feeling of relief in his chest and in his member, Cooper was in a world of bliss as he leaned over towards Ren and planted his head squarely on his chest. After taking a moment to recover, he then turned and kissed Ren's chest.

Ren then fondly looked down at his mate, the broodfather of his children, and proceeded to whisper "Don't worry - there's more where that came from. We've only just begun."

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Week 3

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"Could you all calm down for just five minutes, so I can get some rest?"

It was three o'clock in the morning, but it was clear that his belly full of pups had little intention of letting him get the rest he so desperately needed. It had been a mere three weeks since their initial conception, but the pups' accelerated growth had already left them increasingly wanting for space as they energetically shifted and kicked against each other as well as the walls of Cooper's packed womb.

However, the pups weren't the only things wanting for space. Cooper found himself lying on a mound of blankets out on the living room floor, as he had outgrown his mattress over the course of the past week. His heaving stomach had progressed to where it was now jutting out over four feet from his torso. The smooth dome of his pregnant belly was also now a thing of the past, as the constant activity of his brood of pups made it so that there was little time when his midsection wasn't writhing with activity.

"Ungh...go to sleep..." he heard Ren call out from the couch, where the large rat tossed on his side and placed a pillow over his head to muffle the complaints of his prodigiously pregnant mate.

"Hey! You try having to sleep on the floor while being this big and let's see how much shut-eye you get," Cooper said as he glared over at the slumbering rat. "I'm just about ready to c-- AH" he said as he suddenly winced due to a sudden pain. "Mmmf, ouch. That was a bad one." Cooper had been experiencing false labor pains for the past day, which though painful, gave him a small amount of hope that it was soon that he would be able to bring these pups into the world.

"It'll pass - now go to sleep." Ren said as he tossed and turned again on the couch.

"Right... you said if it was the real thing that my...wait..." Cooper trailed off as he struggled to sit up and examine his surroundings. It was then he found that the bottom area of his mound of blankets was damp with some sort of liquid, and had been for some time without his noticing. "Shit shit shit! That better be milk or els-- UNGH" he cried out as another sharp pain hit at that exact moment. "Criminy that hurt. Uhh - Ren I think you need to wake up."

"As if it was possible to sleep with your caterwauling..." Ren relented as he threw off the pillow from his head and sat up to see what the fuss was about.

"I think they're comiIIING-- AH" Ren exclaimed as he felt yet another sharp pain along with the sudden urge to push.

"Alright, alright. Stay calm... after all, it's going to be a very, very long time before you find yourself without a belly full of my pups. So you'd better get used to this." Ren said as he moved over to go grab a pile of towels that they had at the ready. Moving back over to Cooper with towels and linens at the ready, he stroked his paw on his coyote's growing belly, feeling the pups squirming actively beneath his touch. "Okay - now I'm going to need you to just breathe and push. It looks like we breed them big, so brace yourself."

Cooper leaned back into the many blankets behind him and bit down hard as he felt the first of his spawn moving down into his birth canal. It was then that he felt his body wracked by overwhelmingly strong contractions. Give the size of his belly how much weight he had gained, he had mentally prepared himself for the pups either being big or that there were just many of them. Given the virility of his mate, however, it looked like both were going to be the case. "Mmmf! Here comes the first!" Cooper cried out as he felt his first pup slide along his prostate and push against his pup-producing hole. Bit by bit, he felt a stretching sensation as his spawn stretched him out in order to make their entrance into the world.

"Ah - I can see its head! Almost there!" Ren said to coax his gravid mate.

Cooper then bit down hard and stifled a howl as he pushed the head free, soon followed by the shoulders. It was then that the first pup was released into Ren's paws. Relieved, Cooper then released his breath and flopped back into the pile of blankets that supported the birthing broodfather. The rat beamed with pride as he took a towel and gently cleaned his firstborn and inspected it thoroughly.

"A large and healthy boy. An excellent start to our legacy..." he said as he swaddled the newborn in a blanket and gently placed him beside Cooper. The child was clearly a rat pup - predominantly tan in color, matching Cooper's fur, but with black spots and a white-furred stomach to match Ren's very own. The pup also had a partially elongated muzzle, and with slightly pointed ears it was clear that it had inherited a fair amount of the canine's genetics in spite of its otherwise entirely rat-like body.

After having a moment to breathe, Cooper looked over and warmly smiled as he stared awe-struck at his firstborn son next to him. "He's so beautiful... I bet he'll grow up to be just as handsome as his stud of a father. In fact, I-- AHHH!" Suddenly Cooper was cut off as another wave of contractions hit him, and he was reminded that the pup had many siblings waiting not-so-patiently for their turn to enter the world, as another pup was pushed into his birth canal.

This process continued again as Cooper gave a deep, guttural growl and pushed out the second of their brood, followed quickly in turn by the third. Each pup was diligently caught and cleaned/wrapped before being placed alongside its littermates. As Cooper continued to push, he continued his stifled cries of pain - but found the process becoming easier and easier as he got into the steady cycle of rhythmically pushing alongside his contractions to deliver the next of his brood out into Ren's waiting embrace. Again and again he pushed as two more pups were added to the squirming pile of children to the side of Cooper's still-quite-large belly.

"Alright, let's see - that's number five now. Only a few left to go, then we can rest with our newly started family." Ren gently whispered as he helped to work the next pup out until it was free. But 'a few' came and went, as Cooper continued to push and the number of delivered pups in the couple's brood continued to increase.

Cooper was completely exhausted by this point, but continued to push in time with his continued contractions, until two hours later the litter was born and Cooper collapsed into the multitude of blankets that now formed his nest. After taking a moment to rest his eyes, he then opened them and looked over to find Ren awestruck as he examined the squirming pile of rat pups that the couple had managed to produce.

"Seventeen. In our first litter alone, we managed to produce seventeen beautiful, large and healthy rat pups... All male." said Ren as he shook his head in disbelief. Ren was truly amazed, as he then moved the pups closer to Cooper's chest so that they could begin suckling, realizing that he would need to go get some of the stored milk as well in order to ensure that the pups would all get their fair share.

After taking a couple of hours to rest and nurse, Cooper then sat up and saw Ren bring over a large glass of orange juice to help rehydrate the busy broodfather. "They're all just so beautiful. I can't get over it. Do you think the fact that they're all male has something to do with your genetics?"

"It's possible - but let's not worry about that now. Why don't you just drink and rest up?"

Ren didn't need to ask twice as Cooper gladly accepted the cool juice and began quickly drinking it down. There was something odd, though... Something wasn't quite right with the juice, but it was something that still somehow tasted familiar. What was it?

"Very good." Ren said as he kneeled down and snuggled up next to the fellow father of his young.

Cooper's eyes then shot open as he felt Ren rub his paw along Cooper's leg, and it was then that was able to finally place the strange taste. The juice he just drank tasted almost entirely like the fertility medicine that Ren had been asking Cooper to take.

"Just think... seventeen pups in the span of three weeks," Ren said slyly as he ran his paw further along Cooper's leg. "And that was without the fertility meds in your system when we first conceived." Ren then moved his paw to rub the now-flat belly of his mate. "And now that they're out and have been fed, we can start working on batch number two..."

"You mean right now? Don't you think it's a bit ear-- Ah!" said Cooper as he was interrupted by Ren suddenly coaxing out his member from his sheathe and shifting to position himself on-top of Cooper.

"I told you, as long as I'm here - I'm going to make sure that there's not a moment where you're not gravid with a litter of my spawn." As Ren flipped Cooper over on all-fours and positioned his fully erect cock on Cooper's ring. "Now shut up, so I can pump another litter in you. We wouldn't want to wake the pups, now would we?"

To be continued...