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"I'm really hoping this wasn't a mistake," BoJack grumbled as he pushed through the front door of the studio, the radiant midday sun beating down on him as he entered. "I asked for my first role in years, and I get sent out to goddamn Nebraska as thanks for all the hard work I did in the past. Who the hell does that talent agency think they are?!"

He centred himself with a deep breath as soon as he was inside, calming himself down almost immediately. "Okay, BoJack, focus. It's been a while since your last acting gig, but that's okay. You're still on top of your game. You're gonna make 2004 your year above everyone else, and nothing's gonna get in your way."

It was as if the cosmos had found it funny that he tried giving himself pep talk, as the one thing that could've derailed his entire day just noticed him. "BoJack, is that you?"

BoJack's eyes grew wide with panic. "Oh god no..."

"Mr. Peanutbutter and BoJack Horseman in the same room. What is this, a crossover episode?" Like he was the polar opposite to the horse, Mr. Peanutbutter's shining demeanour cut through the negativity given off by his equine companion.

"Oh yeah, just gets funnier every-" BoJack froze before he could finish the sentence. "Wait, are you here for the movie too?"

"Of course! Why else would I be here?"

That gave BoJack pause. "Huh, then I guess it kinda is a crossover then."

"Actually, now that I think about it, I could be here for many reasons," Peanutbutter scratched his chin in thought." This is Lincoln, Nebraska, after all."

BoJack groaned, palming his face. "Peanutbutter, no one - and I repeat, no one- comes to Lincoln, Nebraska for anything. The people who live here try to leave as soon as they can."

Peanutbutter could only laugh at the equine's dismissal. "No they don't, there's tons to do here! I mean, have you seen all the crops everywhere?"

"Yes, actually," said BoJack. "I took one look at the sea of alfalfa that happened to be in front of me as I walked to the front door of the studio, and then immediately wanted to go home."

"Ah, lighten up and have some fun while you're here." It was just then that Peanutbutter noticed a familiar face in the room. "Oh, Erica. You, in that outfit? You saucy wench!" He giggled, turning back to his friend. "Sorry, just came off a shoot for a medieval movie, it's a little hard for me to break character."

"How is she everywhere like that?" BoJack mumbled under his breath.

Peanutbutter patted the stallion on the shoulder. "You should've been there, I'd have loved for you to have visited!"

The sudden feeling of the lab's hand on him caused BoJack to squirm. "I could've, had I been told about it. I just hope it was busier than this place is," he pursed his lips as he scanned the room, observing how sparse the amount of people there was.

"Oh, it was packed with everyone from cast to crew! You barely had a moment to yourself with the crowd there." Peanutbutter's infectious enthusiasm could break through anyone's gloomy disposition besides the equine's, not that he was intentionally trying to do so. "Although, it makes sense that there'd barely be anybody here since we're still a few weeks out until shooting begins."

While the remark was casually delivered, it jolted BoJack's memory; he'd forgotten that he'd been told that a while back. "Oh yeah, that's right."

"Yeah, it'll give us enough time to fully immerse ourselves in our characters. The scripts are over there, by the way," Peanutbutter pointed to the far end of the room where the booklets of paper lay on a dilapidated, wooden folding table, likely having been at its peak decades ago. "Man, I can't believe I landed back-to-back starring roles. I'm surprised I got to this point in my life so soon!"

BoJack's heart nearly stopped when he heard that. "Starring role?" His breathing intensified. "As in, you're the lead actor in this movie?"

"That's what I was told!" Peanutbutter couldn't stop his tongue from sticking out of his mouth with excitement.

"But..." BoJack sputtered, his expression locked in complete disbelief. "But that's what I was told too!"

"Woah, we're co-leads? Together?!" Peanutbutter's grin stretched from ear-to-ear. "That's so cool! I never thought we'd ever get the chance."

BoJack's fingers involuntarily twitched at the thought of sharing equal screen time with the dog. "Sorry, I have to go make a phone call." He dashed in the opposite direction, trying to put as much distance in between him and the other man as possible.

Peanutbutter waved to the horse. "Don't worry, I have to as well. I need to tell my agent about the great news!"

His hands fidgeting from his elevated heart rate, BoJack fumbled in his pocket for his brand-new cellphone, flipping the clamshell open as he called the only contact that he had. "Marv, you got a sec? We need to talk. Why is Mr. Peanutbutter saying that he's starring in this movie?" The muffled voice of his agent sounded through the tinny speaker, enraging him when he heard the explanation. "Wait, you didn't get me the lead role?" He barked as he held his phone out in front of him. "Kind of?! What does 'kind of' mean in this regard?" The way that his blood pressure rose threatened to burst a vessel in his brain if he wasn't careful. "They're going to choose between me and Peanutbutter for the starring role? And the loser supports them? You knew about this the whole time?!" Had he held his flip phone any tighter to his face it might've cracked in his grip. "Of course there's a loser! I'd have to play second fiddle to 'Dog Breath'!" He rubbed his eyes in annoyance. "Yes, this is a big deal, I don't do supporting roles."

In a huff, he snapped his phone shut and groaned, slumping against the wall. This whole gig just became a disaster in a matter of moments, and the contract that he'd signed back home prevented him from walking away from the project. He had to do this movie, whether he liked it or not.

However, he knew that he could make it work; he was BoJack Horseman, after all. "Okay, okay, this is your first actual role in ages. Let's see what the main character is like here..." He snatched one of the packages lying on the table beside him and flipped through to the description of the character, only to grow confused with what he read. "O-Okay..." Bewilderment continued to well up inside of him the longer that his eyes remained glued to the page - this role was so physically out of his league that he had no idea why he was allowed to sign on in the first place. "Oh my god, this character is a literal giant... was this guy based off of Schwarzenegger's much larger brother that only the scriptwriter knows exists? Or his dad, maybe?" A thought then occurred to him. "Wait, what's Arnold doing right n-oh yeah, the whole 'governor' thing. Really awful timing, if I do say so myself."

The more that he read on, the more that self-doubt coalesced inside of him, culminating in an overwhelming feeling of defeat wash over him. "What am I even doing..." The pages dropped from his hand to the tiled floor. "There's no possible way that I could ever resemble the main character, I should just tell Marv I'll do some other movie and go home."

His uncertainty in himself nearly reached a tipping point, only stopping when he had a look at his competitor and realized something - the canine was significantly less suited for the role. "But he's even smaller than I am. Maybe I have a shot at this after all! Yeah, it doesn't matter that you turned forty and he's still some hot, young thing that everyone pines over. You're already several hundred pounds heavier than he is, you're a shoo-in!" With a newfound eagerness, he grabbed the pages again, though now struggling to think of how the hell he was supposed to pull this off. "Uh, maybe I will be after I ask Arnold for some tips."

***

In the week since he'd arrived, BoJack had his agent arrange him some place where he could train and hone his body in preparation for the role, though doubts still followed him around regardless. He could spend the next four weeks doing nothing but exercising, sure, but he didn't think that it would be enough given the insane physique needed for the part. Still, it was better than nothing; the director would just have to make do.

The facility that had been handed to him to use had a state-of-the-art weight room filled with all sorts of equipment that he'd forced himself to learn about due to the strict routine that he'd been given, a fully-staffed kitchen that he was grateful for as it meant that he didn't have to worry about any 'macronutrients' or whatever they were called, and an exact replica of his bedroom so that he could peacefully sleep when he needed to - basically everything that was required in order for him to eat, sleep, and breathe weightlifting. He just felt it best not to ask where the money for all this came from as he was more focused on the fact that he could get to work right away.

The first day, however, was a total disaster as he'd barely started his routine before feeling soreness set in from head to toe, not realizing that he had to take it easy to start out with. That was coupled with not being used to the restricted diet that had been planned out for him, concluding in the most miserable sleep that he'd had for as long as he could remember. He didn't even enjoy the gym attire picked out for him because both the muscle shirt and shorts were much too large for his average-sized frame. It made him genuinely regret thinking that he could do this.

Little by little, though, BoJack adjusted to his grueling regimen, but not without grumbling the entire time, of course. He dramatically reduced how hard he pushed himself until he got used to the strain and could move onto longer sets of heavier weights. His displeasure with his meals was heard by the chefs, and it surprised him to learn that the paltry amount of choices that he had could be tweaked a bit to his liking. It made him all the more satisfied by the time that bedtime rolled around and he could hit the hay after a shower. Maybe it _was_more possible than he'd initially thought.

The discipline that he'd cultivated over the short period of time that he was there had started paying off, not much at first, but enough to show on his body. What was once a rounded gut had grown trim like he'd once had before genuine abs started forming in its place, which mystified him greatly. Enough definition had formed on his chest that his pectorals had rounded out for the first time in his life. Even his arms - once noodly and insignificant - exposed slight hills of muscle when he moved them. He thought that such developments needed a tremendous amount of time to materialize onto one's body, but he failed to realize that he'd been working out in the gym for more than what was planned out for him daily. Oops.

All of that extra time lifting weights really paid off for him in the end as he possessed the body of an underwear model by the end of the week, much to his amazement. Never before had he looked like this, and yet now that's what stared back at him in the mirror. The clothes that he came didn't even fit the same as they used to, needing a belt just to hold up his pants.

And all the while, BoJack didn't even think about how far overboard he was going with his weightlifting routine. It was practically the only thing that he could do while on location, so he didn't notice that it'd started bleeding into the other parts of his daily schedule. No matter what he did to pass his free time, he was idly lifting while doing it and never regarded it as odd.

Even while visiting his dressing room at the studio he was curling a dumbbell that he'd brought with him. He grunted as he belted out the rest of his set in front of the mirror, groaning in relief when he finished. "Okay, that was probably somewhere around the hundredth rep. I did need to go to a hundred, right?" It was just then that he remembered that he kept his instructions in his pocket, though he couldn't believe what they said when he pulled them out. "Really? Only ten? Huh, guess I need to move up in weight again already."

A satisfied sigh escaped past his lips as he stood up, stretching his sumptuous limbs in the process. "Huh, this exercising thing is easier than I thought it'd be. I wonder why I didn't do it sooner." The answer came to him almost instantaneously. "Right, I'd have to leave the house to do it. Maybe I could make one at home somewhere, I do have a ton of spare rooms I'm not using. Probably would need to knock down a wall or two though."

His gaze flicked to the mirror where he could see the outfit that he had picked up for himself while he was there - a form-fitting athletic shirt that he'd never have thought to buy before, and a pair of jeans in a size that he hadn't worn in over a decade. "Damn, I actually look good!" He spun himself into various positions to get a better look at himself, thoroughly liking what he saw.

"Say..." BoJack knew that there was still time before the shoot took place, but he contemplated whether or not he was sufficiently ready to perform. "I know the character was said to have bulging muscles, but how big do mine have to be before they're considered 'bulging'?"

Curiosity overtaking him, he stripped himself of his shirt, whatever sweat not taken with it matting his fur instead. What stared back at him was a total shock, however one that he was thrilled with. The stallion reflected back at him resembled someone that had spent many months toiling away at the gym, not the week that he'd been in actuality. He knew from the first glance that he was leading man material, but doubt still overtook him when considering the role that he was competing for. "Is this enough? I think it's enough, but will the director think the same?"

He took it upon himself to try out a few poses that he discovered on the internet. Unlike those who sculpted their bodies for a living, he wasn't doing it to merely show off, instead scrutinizing him all over. This was his chance to come back into limelight after an extended break, so he had to make sure that as perfect as could-

"Hey, there you are. I've been looking all over for you!" Mr. Peanutbutter waltzed into the dressing when he saw the equine just past the door, only to do a double take upon getting a good view of his friend. "Doggy doggy... what now? BoJack, you're totally hot right now, buddy! You're looking as healthy as a... well, horse." He giggled at the coincidence.

BoJack, meanwhile, had one hand clenched onto his vanity while the other clutched his chest where his beating heart threatened to burst free. "Goddamn it, you're gonna give me a heart attack one of these days."

"Sorry, I was just excited to see your progress. You're looking, uh..." Peanutbutter snapped his fingers trying to recall a word that he'd just learned. "S-Swole, right? Swole? Is that what the kids these days are saying?"

BoJack cringed. "I should really hope that's not what the kids these days are saying." His breathing had slowed down enough where he could stand normally again, though his eyes nearly fell out of their sockets when he finally got a good look at the dog. His question of whether or not he'd left the Labrador in his dust had been answered, much to his chagrin, as his competitor somehow looked exactly as pumped as he did. How was that possible?!

"Anyway, I just wanted to see how things were going." Peanutbutter patted the horse on the shoulder, though pleasantly surprised at how firm it was. "You're probably gonna land the part, I know it. You're totally looking like star material right now!"

"Yeah, uh..." BoJack squeezed one of his pecs. "A neutron star, perhaps."

"That's the spirit! Happy lifting!" With his usual cheery demeanour, Peanutbutter waved goodbye to the equine as he left the room.

To simply be the same size as the canine wasn't enough for BoJack. He couldn't leave it up to the director to choose between them; he had to be the one that made the decision obvious. He had to get bigger to ensure that the role was rightfully his, and he wasn't about to let the dog steal his shot at fame and glory. "Envy, thy name is BoJack."

It was time to up his game.

***

A lot had happened in the following week. The sight of seeing his rival with a similar build lit a fire under BoJack's ass, causing him to push himself harder than he did before. Besides the necessities, he now spent all his free time working out in order to maximize his gains and become the ideal candidate for the part. It might've been the hardest that he'd ever worked in his life.

From the ring of his alarm clock first thing in the morning, he would jump out of his bed and spend as little time as he could freshening up in order to hit the iron pit. He'd then focus all of his energy on pumping the heaviest weights that he could, making sure that he could haul them without trying before moving onto the next ones in line. At some points he'd be forced to eat, which he did happily, but then he threw himself right back into the gym, lifting until his body eventually gave out. It left him completely exhausted come the end of the day, but it was the good kind of exhaustion that let him sleep easily.

It'd become a routine that he actively looked forward to, which he knew would've weirded the hell out of himself when he started. He was like a machine as he worked out, his concentration centred solely on making himself bigger wherever possible. The outside world had grown unimportant as the only thing that mattered was landing the role. He hadn't spoken to many people since his training began, but he couldn't argue with the results.

BoJack had become a delicious specimen of a horse, looking like a professional bodybuilder because of his constant dedication to his craft. The straps of his A-shirt sat comfortably over traps that had never been there before, but now rose to flank his neck. They came with shoulders the size of cannonballs that attached to arms as powerful as steel cables, rhythmically hoisting loads that would've seemed impossible for him to even fathom not two weeks ago.

His chest was perhaps one of the biggest beneficiaries of his commitment, now protruding out and actually filling the material of his shirt. Those abs that barely showed themselves before now popped due to being perpetually exercised, taking on the appearance of a perfectly laid-out cobblestone road. To their sides were his lats, actually pushing out and making him look wide.

Naturally one of his biggest muscle groups, his quads had ballooned out from the attention they'd gotten. They rippled with densely-packed bulk that he would've normally found grotesque, and yet he was now the one to covet that kind of size. Then there were his calves which, while difficult to work out compared to other body parts, still developed along with the rest of him. All in all he was a pretty tall drink of water in some people's eyes, and he estimated that he might've been in the ballpark of how large the character was meant to be.

Yet that still wasn't enough for him.

The bigger that BoJack got, the more food that he needed to both maintain the bulk that he had and to pile on more later. He flew through weights faster than he thought that he could, but still didn't stop. He required more.

And he got more. His continued efforts in the gym were paying off as he proceeded to swell up even further, his idea of what he'd considered to be a feasible goal size long since passed. Once baggy clothing now clung to his immense form, initially stuck to him thanks to heavy perspiration, but now due to having to contain his burgeoning heft. They looked to be on their last legs regarding the rapid pace that he'd set for himself.

BoJack grunted as he lifted a barbell into the air, his bench press unequaled by those around him. Had he done the research beforehand, he would've discovered that he had overtaken the world record more than an hour ago, but he wasn't content with just stopping there. Both his mind and body demanded that he go further.

"Ah," he snorted, finally starting to feel the burn of soreness seep into his bulging muscles. It'd been, what, over eight hours since he'd first stepped into the gym that day? Maybe that was a good spot for a break. Carefully, he lowered the bar back onto its rests, his barrel chest heaving once the weight had been metaphorically lifted from his shoulders.

With a deep breath, he rocked himself into a sitting position, amazed at how long he'd been under that bar. His body screamed for nourishment, making him grab the jug of protein shake that he'd brought with him, nearly downing the rest of the contents in one go. Damn, almost out already? Nothing seemed to be able to keep up to his incredible tempo. He guessed that it was time to upgrade that too.

Standing up after lying down for so long felt amazing. He could feel the blood rushing throughout his engorged form after working himself so hard, making him feel a bit stiff, but satisfied.

Wall-to-wall mirrors greeted him with the result of all of his hard work - a body that even the Governator himself had to take note of! Biceps as big as a person's head stared back at him as he flexed whatever he could see, yet he wasn't admiring himself like anyone else would. No, his concern still lay with wanting to ensure that the starring role was his and his alone.

"Okay, I've gotta be big enough for the role now. People don't get any bigger than this!" BoJack reasoned with himself, pulling his arms into a crab flex. His eyes painstakingly traced over his bloated form, trying to see if there was any room for improvement. To his delight he couldn't see anything that negatively stood out, which was fantastic because he felt like he was hitting the limit of what he was capable of.

A sudden tearing sounded throughout the gym, completely derailing his train of thought. His mind immediately narrowed down the culprit of the noise, figuring out right away that the back of his muscle shirt had split down the middle, unable to contain his mighty bulk any longer.

"Wait, that's a good thing, right?" He spun around on the balls of his feet, needing to twist slightly to inspect the damage due to his titanic traps preventing his head from doing the work. "I have to be big enough now!" In spite of any other time that he tore through his clothes, he felt good that this happened. It gave him relief that his hard work was paying off and that he'd easily be the front-runner for the role by a country mile. His good spirits kept up until he happened to see something yellow in the mirror moving towards him, his demeanour souring instantly.

"BoJack, hey!" Mr. Peanutbutter waved a meaty arm in the stallion's direction, his lips curling into a smile when he saw equally-yoked compatriot. "Or should I say, 'BoJacked'?"

BoJack grimaced, sliding the remnants of his shirt to the floor. "No, you shouldn't."

"Woah-ho, that shirt looks like it was the victim of... uh, hang on, what was the term for it again..." Peanutbutter scratched the top of his head as he tried to remember, his eyes lighting up when it came to him. "Oh right, 'the pump!'" He snickered, finding the concept humourous. "I've been brushing up on my bodybuilder lingo, does it sound authentic?"

"It sounds weirder than anything else, but that's only because it's coming from you"

"Ah, well, I'm sure I'll get better with time." Peanutbutter's cheerful disposition seemingly couldn't be hampered by anything. "Speaking of which, I've been trying to get a hold of you all morning. Have you just been in here the whole time?"

BoJack thought that the answer was obvious. "Well, yeah, of course." He felt the flames of rivalry fan themselves at the sight of the dog, annoyed that his competitor was as big as he was yet again. "We're both fighting for the same role, so I need to make sure that I'm the best decision for the director to make."

"Dedication, I love it! It's a good look on you," Peanutbutter's eyes trailed across the entirety of the horse's swollen form, liking what he saw. "A real good look. Anyway, I wanted to ask if you'd like to go catch a movie or something. You know, get a change of scenery going."

It was an odd proposition to hear with so little time left before the shoot, and as much as he wanted to relax for a bit, he didn't think that he could afford to right then. "Uh, I mean, I absolutely would, but I feel like it'd be more important if I kept at my job." His eyes narrowed at the Labrador retriever. "Shouldn't _you_also be working out right about now?"

"Ah, don't worry about me. I'm following along with the gym plan I was given on day one and I'm doing just fine. See?" Peanutbutter twisted to show his profile to the equine before tensing it up, his prodigious musculature nearly identical to the man next to him. He looked like he could sweep the competition at any bodybuilding just by showing up! "All of this came from doing just three hours of exercise a day every day since we got here. Impressed?"

"Actually, yeah," BoJack wicked away the sweat trickling down the side of his face that hadn't matted his fur, his breathing intensifying with consternation. "How the hell are you getting so effortlessly huge from such little training?"

"Oh, that's easy. My agent hooked me up with this foreign-sounding supplement from some company I've never heard of, I dunno," Peanutbutter shrugged, his own muscle shirt rising up to display his gorgeous midriff in the process. "Anyway, the results are great. I can't say I've ever looked better!"

In one fell swoop, the canine just took the wind out from BoJack's sails. "You have a supplement?!"

Peanutbutter cocked his head in confusion. "Yeah, don't you?"

BoJack couldn't believe what he was hearing. "Uh. no!" The amount of time that he'd spent slaving away in this iron pit trying to sculpt the perfect body for the role hit him like a ton of bricks. He was beside himself when he realized that there was an easier way the whole time.

"So, you've been doing all this on your own then?" Peanutbutter's jaw nearly fell to the floor. "BoJack, I'm so proud of you, that's incredible!" He couldn't stop his member from plumping up at the thought of the horse working so hard.

"Yeah, it's totally amazing and stuff." It's not fair! How the hell does he always have these lucky breaks?! I work my ass off to try and get the things I want, and he just comes along and takes them all for himself. Well, I'll show him! I'll find out where he's been training and I'll sneak in there - uh, as best as I can, obviously - and I'll take his supplement for myself. Then we'll see who's the biggest guy for-

"Do you want some?"

BoJack felt like his brain just short-circuited upon hearing that. "Come again?"

"Oh, I just did; I couldn't go for another round so soon!" Peanutbutter sniggered at his corny joke, though realized that it might be a lie with how much his arousal was bouncing back from ogling the studly horse. "But back on topic, I have cases of the stuff as it is. I'd absolutely love to give you some since I'd probably never run out even if I tried!"

BoJack still felt like his ears weren't working properly. "You wanna give me some?"

His friend's disbelief left Peanutbutter laughing so hard that his stomach hurt, his pecs bouncing with every breath. "Of course! We're friends, right? Sharing is caring!"

"I..." BoJack didn't know what to say. "Okay, thanks! I, uh, wish I had something to offer in return."

"Eh, your presence is enough of a present to me. Ooh, see what I did there?" Peanutbutter's tongue involuntarily stuck out. "Anyway, now that I'm giving you some of that stuff, you should totally come hang out with me some time! When was the last time you ate out at a restaurant anyway?"

BoJack's mind instantly drew a blank. "Uhhhhhhhhhhhhhhhhhh..."

"Then it's settled! I'll swing by and drop the powder off, then we'll head out to whatever the fanciest place in town is." Peanutbutter beamed, his cheeriness belied by his swollen form. "Sound cool?"

"Uh, s-sure?" In BoJack's mind, the two of them were fighting over something that he thought was super important. It threw him off that the dog was being so kind to him right now.

"Great, it's a date!" Peanutbutter turned to leave, waving to the hoss as he did. "Later, handsome."

BoJack felt like the entire exchange went by in the blink of an eye. He went from thinking that he'd lost the best chance for a comeback that he'd received in years, to now understanding that the battle was far from over. Well, _he_felt like it was a battle. "Oh, I feel weird now."

He spun himself around to face the mirror again, his meaty torso on full display thanks to his shirt giving up the ghost. "Gotta remember why I'm here. I'm doing this for the role. I'm doing this for the role. I'm doing this for the role," he chanted out loud. Still, he couldn't prevent his eyes from wandering along his rippling body, followed by his hand gently fondling a bloated pectoral and moaning at the pleasurable feeling that accompanied it.

His eyes bugged out as wide as saucers when he realized what he was doing. "Uhhhhhhhhhhhhhhhhhh..." He was doing this for the role, right?

Right?

***

The day after was actually quite pleasant, catching BoJack off-guard entirely. He'd been so worked up over trying to secure the leading part that he didn't realize how much his body craved some time off. He even didn't totally hate spending time with the Labrador at all, which was one of the biggest surprises that he'd had in ages. Go figure!

What was equally as astonishing to him was that he'd caught the eyes of numerous people that night, knowing immediately that they were interested in him from just the way that they glanced at him alone. It was something that hadn't happened to him in ages, so he was immediately hooked on the attention. Were this any other time, he'd have chatted up a few people to see what their plans were like and maybe have met up with them later. He wanted to do it - he really, really wanted to do it - but his schedule was simply too busy and wouldn't permit it. But maybe afterwards...

However, he wasn't about to let that stop him from enjoying himself. After he said his thanks to the canine for dropping him back off at his facility, he headed directly to his room, not to go to sleep as his body was wired, but to do the one thing that he hadn't gotten a chance to do in ages - masturbate.

The relief that he felt was intense as he'd been unintentionally blue-balling himself with all the work that he'd been doing over the last couple of weeks. He might've cum almost right away, but he'd been so pent up that he'd practically painted one of the walls of the shower. Heh, he always knew that he had a lot of love to give, but he didn't think it'd be quite that much!

That week, BoJack spent his time doing much of the same as he had before, only this time was with the addition of the supplement that the dog had so graciously supplied him with. He went and mixed it into the protein shake that filled his brand-new two-gallon jug, his excitement of trying it out for himself propelling him into working out right away.

The results were almost immediate. After only a single day of exercising, he blew past his old records without trying and recorded new ones that could easily stand the test of time had he not broken them shortly thereafter. He was flabbergasted at how effortless the whole thing was.

The increasing pressure due to his swelling lower half caused his shorts to bite the dust not long after his shirt did. It made sense given that his quads, which cyclists would've already killed for, had exploded in size, the muscle fibres tearing and repairing themselves without the need for a breather. The rest of his body followed suit, surging larger than what a person's body was naturally capable of. It was exactly what he wanted.

Pecs that hung low in BoJack's peripheral vision had blown up bigger, now present in his field of view when facing directly ahead. Arms that could've once lifted steel beams no problem could now tear them asunder like paper, the split-peak biceps responsible for the action being easily the crown jewels of his limbs. He couldn't have ever imagined his muscles bulging as much as they did, and yet he still wanted to see what happened if he pushed himself further.

His old bench press record was now his warmup curling weight, though it didn't remain necessary to lift for much longer. The loads that he lifted measured in the hundreds of pounds regardless of exercise, though certain ones almost advanced past the four-digit threshold. He was so close to achieving the impossible that he could almost taste it.

Although strangely, those changes weren't the only things that had occurred to him. Completely unbeknownst to him until he glanced in the direction of a mirror was the fact that he'd actually grown taller, the spectacle of which caused him to drop the dumbbells in his hands in total shock. How could that have happened?

That wasn't the only oddity to occur to him as another development had taken place below his beltline. Because the boxers that he'd worn for ages no longer fit him properly, he'd commenced with wearing speedos as they provided significantly more comfort than anything else that he could find. The thing was that they could stretch, to the point that he didn't notice until then that his junk had ballooned up as a direct result of his routine. Words couldn't describe the level of awe that raced throughout his system.

A giddy laugh soon cut through the silence as he observed these newfound alterations first hand. Doorways that he used to fit under without trying were now eye-level with him, and didn't appreciate that he was too wide to fit through them properly. And then there was his colossal genitals which stretched the fabric of his undergarment to its greatest extent. It was like he'd gotten exactly what he'd asked for. Look out, world, there was more than enough hoss for everyone now!

BoJack was beyond thrilled with the development of his workout regimen, though the public, however, saw things differently. What were once glances of desire turned into glares of disgust, not understanding why someone would do something like that to themselves. He tried to shake them out of his mind, but he found that they'd hurt him more than he'd thought they would. It caused him to retreat back into his facility for the rest of the time that he was there.

At least he could forget all about what everyone else thought of him in his gym. There were no prying eyes trying to catch a glimpse of his majestic bulk, and especially no one around to criticize him for transforming into something that they reviled. They were all wrong, of course, as his immense stature was to be admired and respected. Thankfully, he knew what was up.

Well, one other person too. He'd have to thank the canine at some point as he couldn't have gotten this far on his own. But he couldn't get too chummy with the Labrador just yet as they were rivals for the time being. As much as he appreciated all that the dog had done for him, at the end of the day, the pair of them were still fighting to fill the lead role of the movie. He had to be the victor of this contest, hands down.

Which meant that he needed to ensure that he was the right fit for the job. He'd discovered a tailor's measuring tape one day and thought that it'd be the perfect thing to record his measurements with as anything else would've been too cumbersome or outright useless to work with.

He got to work and wrapped it around his humongous arm, doing his absolute damndest to make sure that it stayed relaxed while he measured its circumference. Once content, he pulled the tape away and looked at what number his thumb had indicated, his hand jumping to his mouth in disbelief at what he saw - he'd finally surpassed the three-digit mark!

"God damn, I thought it'd never happen!" BoJack felt a wave of relief wash over him as his goal had been attained. Still, there was one pressing question wriggling through his mind. "Is that enough? It has to be, right?" The longer that he stared at the number, the more confident that he grew. "Yeah, it has to be. Probably."

He then got another as his gaze flicked to the mirror in front of him. "Hmm, I wonder if I can measure my chest with this thing." Trying to prevent himself from simply feeling it up, he pulled the tape around him and attempted to yank it forward, but it just wouldn't envelop his pecs like it did his arm. He was ecstatic.

It was at that moment that Mr. Peanutbutter walked in on the stallion admiring himself, enjoying the show inadvertently presented to him. "Hey now, someone's looking good!" The way that the horse's lats flared out wider than a car did caused his breathing to stagger.

"You know, I'm actually feeling good." BoJack could see from the mirror's reflection that the canine was still pretty much exactly the same size as he was, only he wasn't anywhere nearly as angry as what he used to be. He was still annoyed as it meant that he had to force himself to exercise even harder.

Peanutbutter sauntered up to the overmuscular equine, liking what he saw. "So, I take it the supplement is doing the trick."

"And then some!" BoJack guffawed, showing off his impossible physique. "I mean, look at me! It's insane how fast I've grown in such a short amount of time!" His remark rebounded back at him, recognizing something important in that very moment. "Uh, question."

"Answer!" Peanutbutter's tongue stuck out.

BoJack side-eyed the dog. "Have you noticed that we've both gotten taller since taking the supplement?"

"Oh BoJack, I haven't noticed anything like that at all." Blissful ignorance was one of Peanutbutter's hallmarks, with now being no different. "You've been the only other person I've really interacted with lately"

"But what about doorways?"

"What about them?" Peanutbutter answered in earnest.

BoJack palmed his face. "Never mind..." He then perked up; something that the canine said earlier had just stuck out to him. "Wait, I'm the only person you've been around recently? But, how did you get here then?"

"Oh, I walked here."

BoJack's jaw nearly hit the ground when he heard that. "And you didn't see anyone else along the way?"

"BoJack, come now. My training facility is right next door to yours," Peanutbutter said. "Why do you think I'm over here so much?"

"I..." It was as if everything had just made sense to BoJack at that very moment. "I honestly didn't even consider the possibility."

"Well, consider it now, because you can visit any time you'd like to!" Peanutbutter threw his bulky arms up in celebration, exposing the furry pits that had flourished since he'd started growing. "You know, I've been doing some thinking."

BoJack felt his gargantuan body tense up when he heard that. "I feel genuine panic when you say those words."

"I believe that 'GrowJack' might be a better name for you now that I think about it."

The pun caused BoJack to groan like a million dad jokes had just been uttered at once. It also induced him into thinking of a name to refer to the dog with. "And then I guess you'd wanna be called 'Peanutbuffer' or something like that?"

"Oh, I'd love that!" The nickname made Peanutbutter swell with glee, his colossal muscle mass tensing as a result. "These would be way better than what the press is calling us now."

BoJack quirked a brow. "What are they calling us exactly?"

"A lot of really mean names, in my honest opinion. They can't understand why we'd wanna get all huge and stuff," Peanutbutter scoffed. "Uh, hello? We're actors trying to fit into a role, this is literally what we're meant to do!"

"Yeah, well, I think we shot past our marks ages ago." Despite being a few inches taller than the Labrador was, BoJack could see that the canine had the exact same preposterous dimensions that he possessed. He didn't anticipate just how much he liked the thought of that.

"That just means we're the best in the biz!" The way that Peanutbutter pulled his balled-up fists towards his core puffed out his chest, his snout scant inches away from the rigid flesh. "I'd like to see Daniel Day Lewis try to do what we're doing."

BoJack pinched the bridge of his nose, the image planted in his head making him wholly uncomfortable. "I wouldn't."

"Well, he might not be as lucky as I am," Peanutbutter grinned. "I exercise for only two hours a day and still look this fantastic."

BoJack narrowed his eyes at the Labrador. "Okay, I genuinely have to ask," he sighed. "How the hell are you so massive if you're not even working out that much?"

"Oh, uh, well," Peanutbutter's face grew crimson as a blush crossed from one cheek to the other, "between you and me, I've been feeling a lot more excited lately, _if_you know what I mean." He nudged the horse in the ribcage. "My needs come before preparing for the role, but I'm in luck because it basically does the same thing for me!" His endowment throbbed, as if on cue. "Dude, I totally need to use both hands now!"

"Yeah, same, but-" BoJack scratched his head in confusion. "Do you not take the supplement anymore then?"

Peanutbutter chuckled. "Oh no, I do. I have my private chefs put it in everything that I eat."

"It's in everything you-" BoJack's face lit up; he hadn't considered that. "Holy shit, that's actually genius."

"I know, right? It makes things so much easier for me," Peanutbutter smirked, only for his lips to contort into a frown right after. "Though, I will say that this thing getting bigger," he gripped his sizable cock through the speedo that he also wore, "sidetracks me from pretty much everything that I wanna do."

BoJack ultimately agreed. "Yeah, it's gotten to be a bit of a-" He stopped himself mid sentence, realizing that the saying wasn't appropriate in this regard. "Actually, it's more than a handful now. Why are you having so much trouble with it though?"

"Ah, it's a dog thing. We're highly susceptible to smells, and that's literally all my body has been producing. It's driving me nuts how much I like it! I mean, your scent is incredibly earthy and I just can't get enough of it." As if to drive home the point, Peanutbutter's tented manhood began drooling precum through its fabric prison. "Oops, there I go leaking everywhere again!" He nervously chuckled. "I can't seem to help myself these days, especially around a stud like you." He flashed the stallion a winning smile. "I best go take care of this before I flood the place."

"Wait, can you actually do that?"

"I dunno, but I'd rather not find out." Peanutbutter shrugged his boulder shoulders. "Toodles!"

BoJack bit his bottom lip as he watched the dog hurriedly turn and leave his gym, oblivious to what he got to witness. He failed to stifle a moan when he saw the canine's yellow-furred rear heave with every bounding step, those globular cheeks each easily weighing as much as two people. The way they dimpled as they flexed caused his own shaft to leak like a faucet.

And then there was the Labrador's back. That man was fucking wide! It made him want to know what it was like to touch it and hold it in his own hands, but he knew that he couldn't. All that he could do was picture what it'd be like. He then became the hostage of his overactive imagination. "God, is this really happening right now?"

His gym wasn't exactly the place that he liked to relieve the pressure building up inside of him, but right now he had no choice in the matter. Without a care in the world, he tore his speedo off with a single tug, tossing aside the soiled material. Only one thing was important to him at that moment.

Huffing, BoJack eagerly gripped his turgid shaft, needing to use both of his hands just like the dog said that he had to. The intense pleasure shooting from merely touching his flared horsecock dropped him to his knees. His chest heaved with every breath that he took.

Pre ran down his telephone-pole length, allowing his hands to effortlessly glide along black-skinned crotch rocket. He needed release so badly and would stop at nothing until he achieved it. His car-tire balls felt engorged with cum, churning it all the while that the canine had stopped by. A pulse of revulsion hit him directly in the soul for even thinking of his rival in that sense, but it faded almost instantaneously when he realized that there was no other person in the world who could presently understand him.

Fuck, he wished that the Labrador hadn't have left! He wanted to see just how powerful his climax was, as well as how much his prodigious bulk bulged when in the act. And what was that about smell? He pushed his snout as far forward as he could, contacting his titanic chest and whuffing everything that he could, moaning when his heady musk completely filled his nostrils. His brain grew lust drunk in an instant. How had he not thought to try that before?!

The euphoric bliss was strong, nailing him like an orgasmic sledgehammer to the brain. His nerves grew fried the longer that he stroked himself to completion, doing everything in his power to tip his arousal over the edge. He wanted to empty his balls of everything that they possessed.

And BoJack would get exactly what he'd wished for. A loud groan slipped out from his throat as his sloshing orbs pulled up to his pelvis, the pressure in his taint releasing as virile horsebatter shot like a cannon from his bulging cumpipe. Every single nerve in his system felt hot and alive, while every muscle on his body tensed as large as they would go. This was the hardest that he'd ever shot his load, and it was all because of seeing what he considered to be his competitor. Go figure.

He painted the wall closest to him with his pearly-white spunk, blasting more in the same spot as the rest dripped down and pooled along the matted floor. There wasn't anywhere for his cum to go, but he knew that he had a whole crew behind him to take care of whatever he needed. Wait, would someone actually want to clean up all of this? It was their job, but still... Ah, he'd worry about that later.

By the time that he'd finished firing off the last of his rounds he'd been reduced to a panting mess, only able to shakily keep himself sitting upright because of the innate power in his arms. "Huh, that's the first time in a while I've been able to do that without watching my DVDs of Horsin' Around. That felt kinda nice." He sighed and leaned his head back. It was only after he had a few moments to reflect on his release that he came to a sudden realization. "Wait, am I actually liking this?" He mulled it over in his head, concluding that it felt far too natural to not be something that he enjoyed. Although...

"Uh, maybe I should go one more time." His brain had already fired up images of the canine for the occasion. "Just to be sure."

***

It was the last day before filming the movie was set to take place, and BoJack couldn't have been more nervous about it. He read and re-read the character description in a frenzy, his brain freaking out every time that it processed those words. "I think I overdid it a bit."

That was an understatement. Now standing at over eight feet tall, he was a veritable behemoth the likes of which the world had never laid their unworthy eyes on. He tipped the scales at well over a full ton thanks to his body's natural inclination to being heavy, but if anything were to be regarded, it would be the inconceivable muscle mass that he'd impossibly cultivated in only a month's time.

Beyond even a heavyweight bodybuilder's wildest dreams, his chestnut-furred pectorals jutted out proud, remaining mere centimetres away from the tip of his nose. His intoxicating musk was now a constant part of the air that he breathed in.

Unlike the previous weeks, his now-tree-trunk-sized obelisk remained half-chubbed at all times, ready for him to fire the loads that his pendulous testosterone factories perpetually gurgled up. The regular need to release his seed kept him teetering on the edge of succumbing to his arousal, which happened more often than not.

BoJack paced around his gym at hasty speed, all the equipment pushed aside now that he no longer had a use for any of it. Not that it was because of the shoot taking place the next day, but rather because of the fact that none of it provided ample resistance to him anymore. That really burned him because he could've used something to lift in order to settle his nerves.

And what was nervous about exactly? That somehow - after everything that he'd put himself through over the last few weeks - he was still not big enough to claim the lead role in the film. From the outside looking in that seemed like a ridiculous thought to have seeing as he far outclassed the character that he was meant to be portraying. In fact, he'd actually managed to grow over ten times as gigantic as what was initially asked of him!

He found himself alone on one part of the set, managing to sneak over to the studio undetected under the cover of night, though with the soil being damp due to recent storms he wondered if he'd left any footprints behind. It might be a little bit difficult for his PR team to spin a story to take suspicion off of him, but that was what they were paid to do.

With a sigh, BoJack tossed the script over to a chair where it landed in an unceremonious fashion, half-ready to fall to the ground from the slightest provocation. He was done worrying about whether or not he was star material; he managed to bulk up as much as he could in the short amount of time that he was allotted. For better or for worse, he did the absolute best that he could do and he should be proud of that.

Still...

"Doggy doggy... holy fuck!" Mr. Peanutbutter had only just gotten to the set, thinking that he was the first one there as he didn't see a single parked car in the lot, but he failed to realize that, just like himself, no vehicle on the planet could possibly transport him from one location to another without it dramatically eating into his bank account.

BoJack wasn't expecting anyone else to have shown up yet. He had to rotate his entire body to see his guest as simply turning his head was no longer feasible due to the hundreds of pounds of musky bulk locking it permanently forward. "Oh, hey. I didn't know if anyone else was gonna be here today." His traps had swollen to the point where a simple flex made them rise higher than his ears, meaning the mere act of looking slightly downwards at the Labrador caused an ear to flick from the stimulation.

"Goddamn, BoJack... You're gigantic!" Having lost his shame in the week leading up to the shoot, Peanutbutter didn't react when his leviathan meatlog stood at full mast when he took in the equine's handsome visage.

"Uh, well..." The unexpected praise from the canine's boner caused BoJack's to engorge with blood, thick veins snaking along its length like roads on a map.

"Oh cool, it actually does flare at the tip!" Peanutbutter's eyes lit up when he observed his friend's tumescent phallus, unknowingly licking his lips in the process.

BoJack wanted to naturally cock his head at the remark, but didn't realize until then that he physically couldn't do that anymore. "Uh, isn't that common knowledge by now?"

"It is, but I've just never seen it in person before!" Peanutbutter beamed at the colossal stallion.

As weird as BoJack thought it was, it made sense that not everyone had gotten a chance to view it up close like that. "So, what brings you to this secluded part of the studio?"

"I like to rehearse my lines in as authentic a place as I can manage, which - ninety percent of the time - happens to be the movie set."

"Huh, that's not bad. I kinda like that," BoJack mused. It only then struck him as odd that he could hear the rumbling of his voice so well throughout the studio. Something wasn't right. "You know, it's the day before shooting and we're the only people here." His ears whipped around in every direction of the set as if waiting to hear something that wasn't presently there. "Where is everyone else? Shouldn't there be others around doing their jobs and stuff?"

"Hey, you're right!" The realization that the pair of them were alone caused his own ears to perk up, concurring that they were alone for whatever reason. "Alright, I'm officially weirded out. This has never happened to me before."

BoJack groaned in frustration when a whole host of possible reasons floated to the top of his mind, not particularly liking anything that his brain had come up with. "God, I'm hoping this wasn't some elaborate prank or something. The ridiculous description of the main character seemed way too unrealistic."

"Mmm, I don't think it was a prank. We had to sign contracts to be here, which the studio heads and director were also required to fill out before even starting to cast the movie. They're as contractually obligated to be here as we are." He gave the hoss a knowing look. "And you really think the character is unrealistic?" He scoffed. "Have you seen us?"

"Okay, true," BoJack said. The silence that then rang out between the two was deafening, not helped by the inability for him to pass the time any faster than it was already moving. It didn't even matter that his phone was back at the facility as he grew far too big to be able to use it. There was legitimately nothing to entertain himself while he was there. "Well, I'm bored now."

"Yeah, there doesn't seem to be-" To his immeasurable dismay, Peanutbutter felt his nose twitch as it took in the debilitating aroma of masculinity present in the room, both from himself and the stallion Adonis next to him. "Goddamn it..."

Seeing the dog squirm without context concerned BoJack. "What's up?"

Peanutbutter nervously chuckled. "It's the 'smell' thing again. Gotta love being a dog." Anxiously, he eyed up the carpet of fur that ran down the front of his friend's immense torso, tracing it from the top of those brown-furred boulders plastered on the horse's chest, to the base of his monolithic pillar. The scent was only getting stronger, much to his chagrin. "Um, out of curiosity, how long have you holed yourself up in this enclosed space?"

"Hmm, let's see..." BoJack drummed his fingers along his bloated quad as he could no longer scratch his chin when thinking. "I'd say around one-"

"Hour?!" Peanutbutter's eyes lit up in wonderment.

BoJack rubbed the back of his bull neck, an act made difficult by both of his tremendous arms and impossibly wide lats fighting for what little room was available of his broad frame. "Yeah, give or take seven."

That was, quite possibly, the worst thing that Peanutbutter could've heard at that moment. "Oh no..."

"Why? What's the matter?"

"I'm really sorry about this, BoJack, but I can't control myself any longer." Without even thinking about it, Peanutbutter launched himself at the enormous equine, digging his nose as far between those slabs of chest beef would allow him. His brain had become inundated with the other man's heady musk. "Oh god, you smell so good!" He moaned aloud.

"Oh," BoJack's eyes grew as wide as dinner plates, feeling his prick ooze pre from the sensation of having someone else caress his bulk. "Oh no."

"Oh yes. This was what I was afraid of." Peanutbutter sighed in ecstasy as he let his mind wander in the fog of manly essence. "I figured it'd only be a matter of time until this happened."

BoJack gulped, his horniness skyrocketing. "D-Do you want us to-"

"I don't care about stopping anymore, BoJack. I need this more than anything." His libido gaining control of his actions, Peanutbutter gripped the horse's swollen lats and tongued through the musky forest of fur right in front of his nose, digging up the ambrosial scent right from its source.

"Shit, you know what you're doing." BoJack felt the Labrador's hands roam along whatever part of his mountainous back was in reach, his fingers twitching as his sensitive nerves fired pulses of euphoric delight to the pleasure centre of his brain.

"I know what feels good on me, so it must feel good on you too." Peanutbutter's mind grew clouded with lust guiding his actions. "Like this." Without warning, he grasped onto the hoss' thick nipples, squeezing them carefully as he turned them ever so slightly.

That was the last straw for BoJack's composure to remain. His urges pushed their way to the forefront, steering his body to whatever could sate his needs the fastest. It caused him to clamp his hands onto the dog's prodigious rear end, kneading those flexing cheeks with a longing fondle. "I-I need to do this, Peanutbutter, I need to take you."

"Do it," Peanutbutter commanded. "Neither of us can think straight right now, so take my ass and help us both out." He was overwhelmed with a litany of emotions. He'd always thought that the horse was rather cute to begin with, and the addition of delicious bulk only made him more attractive in his eyes. But now? That stallion had to have been the hottest thing that he'd ever seen in his life, and he wanted nothing more than to feel the other titan's fuckmeat buried inside of him. His pucker even winked in anticipation of being stuffed.

Wordlessly, BoJack complied, shoving the dog to the floor as he hunkered over the other colossus, his gargantuan pecs resting on the canine's hilly back. His throbbing shaft needed guidance to find the Labrador's delicate ring of muscle, but it needed no assistance once it found its place. He slid it effortlessly inside his lover's hungry hole, eliciting admittedly whorish moans out of the both of them. This would be something that they remember for the rest of their lives.

While it wasn't something particularly well-known, Peanutbutter had slept around with plenty of guys in the past, so he had an inkling of what it was like to be in either position. That said, there was no possible way that he could've found someone to impale him before now, even proportionally. The stallion claiming his ass stretched him out far more than anyone else could ever dared to hope. It was everything that he'd wanted since growing, and what he blew his loads to back at his facility. He was living his dream come true.

BoJack, on the other hand, had never even thought about fooling around with another man until now. The thought had always repulsed him, but he realized that it was due to knowing that no one would have truly made him feel alive like he was at the moment. The more that his hulking log of equine fuckmeat squeezed into the Labrador's tight anal cavity, the louder the moans that came from the man underneath him. Shit, maybe he actually should've tried this earlier.

The way that his insides got skewered by the flared rod of his lover made Peanutbutter's arms buckle almost instantaneously. It left him face down with his ass raised as high in the air as it could go, but that was perfect. He pushed back with all of his might against his anal invader until, finally, he'd taken that monster to hilt, evoking groans of pleasure from the pair of them. He knew what was about to come next, and he couldn't wait.

Completely inside the canine behemoth now, BoJack began the arduous task of pulling his length partway out, sending more shockwaves of ecstasy rippling through the dog's form as his flared scraped along the sides of his lover's silken bowels. At least his apparently never-ending supply of pre made things easier for the two of them to manage as now the fun part could begin.

Peanutbutter gasped when the second plunge took him by surprise, being significantly faster and more forceful than he was anticipating. It was only then that he realized that his asshole had gaped enough to allow for the horsecock to easily slide inside of him, wondering if other people had taken the mammothian stallion so smoothly before. If not, he'd claim that title for himself; he'd earned it.

BoJack began to build up momentum in his hips, his pace quickening as his needs pushed him to cum as quickly as possible. His massive orbs barely ground against the floor with every thrust, but they slammed against the other titan's immense quads, a mighty thud signaling contact. Neither of them minded as it didn't hurt. On the contrary, it actually sent frenzied delight ripping up their spines, causing his bucking to move faster. He had no idea how much jizz his balls actually held, but he certainly knew that the pair of them were about to find out how much a musclebeast dog could contain.

The reaming of his asshole increasing, Peanutbutter laid his head on his hands with his tongue unceremoniously lolling out. Every single jackhammering thrust into his rectal cavity caused tension to build up inside of his lower half, especially with how hard the horse flattened his prostate. He'd never been this much of a sexual wreck until now.

A sudden gasp shot past BoJack's lips as he felt his undulating cock get clamped down on by his lover's inner walls, his fingers trembling as they gripped onto whatever they could reach. That ended up being the Labrador's diamond-hard pecs, which refused to let him dent the flesh when flexed. The sensation shot pleasure through the both of them, making him fuck the dog's ass faster and faster. It was having the effect that they were fishing for though, as his arousal was nearing the tipping point. There was no turning back now.

Peanutbutter, too, could feel his libido climbing towards the peak of release. All he could do was mentally hold on as the rhythmic pounding forced his eyes to go half-lidded the longer that it lasted. His throbbing doghood had drooled translucent preseed all over the floor, but he didn't care. The only thing that he was interested in was completely draining his balls and having the equine do the same into him. It was only a matter of time now.

BoJack's humping grew erratic as he neared closer to orgasm, his breathing staggered as his heartbeat raced a mile a minute. He had his own trouble seeing the action as his eyelids refused to stay open. The only thing that he needed was his sense of touch, which currently expressed to him that the canine behemoth had grown as wide as he was tall. That was all that he needed; his eyes screwed shut, his hands gripped steely flesh, and his pelvis slammed flush with the other titan's globular ass. His dam burst wide open, right into the awaiting cavity of his dog.

Peanutbutter couldn't fathom the deluge about to fill him up until it did, coursing through his insides far faster than any of his other male partners had ever achieved. It caused a chain reaction inside of himself as the pressure that he'd been holding onto instantly released as his balls pulled up to his crotch, firing off untold litres of dogbatter against the floor. He'd been through this motion numerous times in the past, yet this felt so alien to him with how much force was involved, and yet he wouldn't have it any other way.

BoJack involuntarily shifted his posture and buried his nose into Peanutbutter's back, inhaling the Labrador's delicious scent like his lover did with his. He finally understood the attraction to it as his brain registered nothing but pure virile masculinity with every whiff. It caused his flow to shoot faster than he'd thought possible, but it didn't matter as the pleasure embroiled in their passionate display blinded his mind to anything else but.

Not wanting to waste a single drop, Peanutbutter clenched down his anus as tight as he could possibly make it. He wanted it all, every single dollop of his gargantuan lover's potent essence. His own flood continued to paint the floor in a pearlescent white as it streamed outside of the room. It felt to him like time had slowed to a halt as his internal cavity received the same treatment. The pressure in his balls emptied as the tension in his guts built up. Not that he minded, of course, because it was all protein that his body could use later on. He'd become bigger and stronger, not just for himself, but for the both of them, exactly how he wanted it.

The last few spurts of jism from his pole made BoJack whimper in exhaustion before his arms eventually gave out, landing face-first in the dog's musky back. He could barely comprehend what had just happened even as his bearings started returning to him. Just about the only thing that he could understand was that his face felt warm, indicating that he wasn't lying down on the floor. Not once in his life had he ever creamed himself quite so hard, but he was more than okay with that being his new normal.

If there was one good thing about having multiple previous male partners it was that Peanutbutter had become far more adept at handling the aftermath of a round of passion. Sure, he loved to revel in the afterglow, but he could compose himself far easier than those who didn't have that kind of experience, like the humongous horse on top of him. Luckily, though, he could feel the stud coming to, pulling that meatlog free from his ass with a lewd squelch.

"Oh shit!" BoJack nearly collapsed from dizziness, needing to use the enormous dog as support until the blood returned to the head on his shoulders. "Looks like you finally got your crossover episode," he lovingly caressed Labrador's swollen back muscles. "Goddamn, that was incredible!"

"I know! Best sex I've ever had, hands down." Peanutbutter wriggled out from underneath his lover, his gaping hole miraculously not letting any cum escape. "Had I known you were this much of a stud I've have slept with you ages ago!"

The abrupt remark caught BoJack by surprise. "I'm sorry, you-" He shook his head in confusion, though the canine's words rang loud and clear. "You what?"

"Uh, yeah. We're friends!" Peanutbutter chuckled. "I've looked up to you for decades now."

"But we've only really known each other for-" BoJack got hit with another comment that he wasn't prepared for, his words struggling to exit his mouth. "I'm sorry, what?"

This admission had been trapped inside of Peanutbutter for a while now, and it felt incredibly cathartic to finally release all of the built-up tension that had coalesced over the course of many long, fruitless years. "Yeah, BoJack! I've always kinda felt like a nobody on set, while you're this bigshot, veteran actor who gets all the coolest roles."

BoJack stumbled over his words. "But... but I haven't gotten a role for anything in eons now!"

"Ah, that's just Hollywood for ya. They wouldn't know talent if it fucked them in the ass," Peanutbutter shot the horse a sly grin. "Know what I'm say-"

"Yes, I know what you're saying!" BoJack blurted out.

Unlike the stallion, Peanutbutter opted to see things from a different light. "Well, if you're bummed about not landing roles, this can totally be your comeback!"

"Oh yeah, if they ever need a concrete wall or an Olympic pool filled, I'm their horse..." BoJack groaned.

"That's the spirit!"

BoJack glared at the dog before rolling his eyes. "So, what do we do now?"

"What do you mean?" Peanutbutter quirked a brow, his expression contorting into confusion. "We've got the roles sorted out, so we can go ahead and start shooting this film tomorrow no problem."

"Wait you..." It might've been because his brain was still fried from the greatest sex of his life, but BoJack couldn't understand what the other man was getting at. "I beg your pardon?"

Peanutbutter, meanwhile, thought the answer was glaringly obvious and that the equine was being obtuse. "Uh, well, you're clearly bigger than I am. It only makes sense that you're the lead and I'm supporting you."

"Oh?" The statement prompted him to look down, only to remember that his immediate downward vision was blocked by the vastness of his unbelievable pectorals. The rest of him was equally as massive, and - noting how the dog seemed to have grown bigger while the pair of them fucked - it made total sense that he'd have gained a ton of mass as well. The revelation thrilled him to his core. "Oh! I guess I am, aren't I?"

"Yeah, you are!" Peanutbutter beamed. "We've also accidentally practiced for the sex scenes too, so this thing's gonna go real smoothly!"

BoJack froze in place when he heard that. "Excuse me? The 'what'?!" He reached over to where he left his script and rifled through the pages for the first time since he'd picked it up, immediately happening upon several of the scenes mentioned by the canine. Did his agent tell him any of this beforehand? His mind couldn't piece together what he was reading. "Wait, what kinda movie are we shooting again?"