God I'm a stud. The creaking of my pelt as I lifted weights? Best fucking sound in the world. All eyes are on me as I pump iron, though it's hard not to understand why. When you've got muscles that are bulging all over your body and a huge fat bulge that can be barely held in your speedo, you're going to get all kinds of looks. I mean yeah, it's the only thing I was wearing, but you gotta show off your stuff when you're as manly as I am! As I let down the weights I was holding, two 300 pounds to be exact, I catch a few ladies staring at me as they walk by the gym doors. I give a flex of my arms and show off my bulge, my cock straining the fabric of my speedo. It was half hanging out of it, but I didn't give a shit. The damn thing is as thick as a soda bottle and as long as one, my balls huge and fat like melons. Ain't hiding that shit from no one. Seeing women blush and giggle at my size was always a nice treat. They want me, I know they do. What lady wouldn't want a huge mastiff like myself? It helped to be the main trainer in the gym though. Meant I had first dibs on any of the ladies that walked in. Sure, I usually ended up fucking them mid workout, but they'd be begging for it. No lady can resist my thick musk. It was always so damn nice seeing even married women or young couples get torn apart by my body. I was a god, no denying that. I was annoyed though. It was a slow day for me. Lots of guys coming in, but no women. God I needed a fuck. I've broken a couple of guys in my time, but nothing was as satisfying as claiming a woman. I probably had a lot of pups floating around, not that I was going to care for them. Bitches should've stayed away if they didn't want my pups. I was beginning to think it was going to be a sausage fest today when a bitch finally showed up. In came waddling in was the fattest damn corgi I'd ever seen. She was half my size but just as wide, thick rolls of fat wobbling on her body. Damn bitch had some fat ass tits too, bigger than her head, around the size of beach balls. My cock instantly stirred in my speedo, straining the fabric. God I wanted to just dive into her ass and get my load off, but I had to be somewhat professional. The fat blob of corgi needed to know what she was dealing with. I stood up from my workout bench, sauntering over to her. My cock tented my speedo, but I wanted the bitch to see it. I wanted to show her what she was getting into, what would soon be dominating her. “Hey there bitch, looking to get a workout?” I said, making sure to flex and exude my body to her. Yeah, work it. Show that bitch what a man you are. The corgi yipped a bit, no doubt surprised by how big I was. I towered over her for sure, her head just eye level with my meaty bulge. “Oh, hi there! Yeah, I was looking to workout a bit. You're an awfully big guy!” I scoffed. No shit bitch. “Yeah I know.” There was a bit of arrogance to my words, but it was the truth. “There's no one else that can match my size. I'm the biggest guy here, no, in the fucking city. If you wanted a workout, you came to the right place. Just lay down on a bench and I'll get to fucking that huge ass of yours. Her face turned, a confused look on her face. What, you dumb too bitch? That fat face of yours have pudding for brains too? “Fucking? I thought you only worked out here?” “Hell no! If you came here, you obviously came here to see me. No bitch just walks in here without seeing me first. I'm the strongest and manliest guy here, so you'll be working out with me.” “Manliest guy here? That's funny! I'm more manlier than you!” The corgi laughed, her thick rolls of fat wobbling. What? You can't be serious. This fat bitch was less a man than she could ever be. A single drop of my seed was manlier than her. I couldn't help it, I laughed like a damn riot, cocking everyone's head over to us. “You?!? manlier than me?!? Are you fucking dumb?! Wow, no wonder. I was thinking you were a dumb bitch but you're even dumber than that!” I was hysterical, the corgi not flinching. She just stood there smiling at me. “I am! I'll show you.” She giggled before taking in a deep breath and then she grunted hard. The dumb bitch looked like she was trying to take a shit, her body shaking a bit as she grunted. “What the hell are you going on about?” My ears flicked a bit as I then heard a sound among her grunting. It was a creaking sound, like something was straining. It took me a moment to realize the noise was coming from her, the corgi soon panting. She grabbed the flab of her belly, shocking me a bit to see she was packing under that flab, a round bulge in the front of her tight pants. “See? I can be manly too!” Did...Did she just grow a cock and fucking balls? How in the fucking.... I shook my head. There was no way that was real. Obviously some dumb trick to fool me. “That's uh.... some 'trick' you got there. Not going to stop me from fucking you though. Seriously, just get onto the bench so we can start this. I've been backed up all day and really need to blow a load in some cunt.” She frowned again, letting go of her belly. “Not manly enough? Well, let's fix that then!” She smiled before clenching her hands, closing her eyes and grunting hard once again, straining her body in an intense flex all things considering. “Look bitch, I just want to-” I was quickly silenced by the sound of straining again, the fabric of her pants even more audible this time. To my surprise, her bulge got bigger, enough to where I could see it. I glanced over to see what the other guys there were thinking, but no one was really caring. In fact, everyone was acting like it was normal. “How's that? Manly enough yet?” I turned back to scoff at her, but my words fell short. Not only was her bulge just as big as mine, the corgi seemed different. It took me a second to realize her face was gruffer, the fur in between her huge bust even thicker. “W-What the fuck? Did you fucking grow a beard?!” I kinda said it without even thinking about it, the corgi still in her same neutral smile. Her hand went up and rubbed her chin, giggling a bit as she did. “Yeah! Makes me manlier don't you think?” She couldn't be serious. How the fuck was she doing what she was doing? “Y-Yeah I guess....No, no! Fuck, how the hell! I don't know how you're doing that bitch, but you'll never be as manly as me! I'm a fucking god!” I didn't care what she was doing. I was a chiseled god compared to her, there was nothing she could do to match me! “Still not enough?” The corgi sighed before getting ready again. She got ready and began grunting again, her body straining. My eyes instantly shot down to her bulge, waiting. Was it really going to get bigger? There was no way. And yet, my maw was drooping, my eyes wide as I watched it swell, grow and creak. Her pants were heavily audible now, up until the fabric started to tear. It was slow at first until it ripped open, her fat package exploding out and flopping against the floor. No way. It was real. I watched as her sheath and balls swelled up, my mind unable to process what was happening. She wasn't even erect and her sheath was bigger than my cock! She continued to grunt for a bit, her balls getting bigger than her ass and her sheath a massive fat roll on top of them. It was only then that I saw the thick bush at the base of her package. It was a forest of hair, trailing up her belly and spreading thickly across her chest. Her beard grew out thicker, bushier; my mind trying to comprehend how she was still a woman despite what her body changing as much as it did. “How about now? Am I manly enough?” Her voice was still sweet and feminine, only furthering the confusion of my mind. This fat bitch was somehow able to be even manlier than me! I took a deep breath and instantly regretted it. Her musk. Oh god her musk. It hit my nose like a truck. My mind was instantly consumed by it's thick smell, causing me to cough a bit. I loved my musk cuz of how thick it was, but hers was on a whole other level! She giggled a bit at my reaction, but I didn't want to seem weak. There was no way she was manlier than me! “N-No! Fuck no! You aren't! You see this body?! I'm still manlier by a large margin bitch! My muscles can do way more talking than your fat blob of fat!” I huffed a bit, somewhere in between confusion and anger. I wasn't about to be shown up. “Muscles! Oh, I completely forgot about those! I guess those do make you manly huh? Think I'd be manlier if I was jacked?” She wasn't serious. She couldn't be. The corgi smiled before she flex her arms across her chest, grunting hard and rough. Slowly, I heard loud snaps and cracks before her arms began to thicken and bulge. There was no fucking way. The bitch's muscles were getting bigger! Slowly they snapped and bulged, the corgi changing poses to only accent the growth more and more. Even her legs were bulging with more and more muscle, but her body remained heavily fat. I had heard of muscular fat men before, but she was taking it to the extreme! It didn't take long for her to get as buff as I was, but she didn't stop there. She kept bulking up bigger and bigger, her head soon getting lost a bit under just how muscular she was. By the time she was done, I couldn't even guess that she was a woman with how manly her body was. The corgi was half my size, maybe three feet tall at most, but she was a massive hulk all over. “There, I think I'm manlier than you now!” I gulped roughly, finding it hard to find words. I even felt my body shake, unable to understand what had happened. The fat bitch came in a few minutes ago to work out and she was now a herculean bodybuilder as if she had been working out all her life. I was in utter shock, dazed as I stared at her. My ears soon twitched though, the sounds of the front door ringing. In walked two buff golden retrievers. Finally, some sluts that I can use! I took no interest in the corgi and further, quickly approaching the two ladies. “Hey there bitches! Looking to work with the stud today?” Both of them looked to me and chuckled, once again confusion hit me. “Work with you? Maybe if you get to our size first!” They both laughed a bit, only making me further confused. In an instant though, I froze. I didn't want to do it, but I hadn't looked at myself since talking to the corgi. The gym was covered in mirrors along the walls and I was paralyzed to look at them. There was no way she did. I turned, my heart sinking heavily at the sight. Staring back at me was a twig of a man. Not an ounce of size or muscle on my body. While she had grown, my body shrank. I was no longer even an ounce of a man I had thought I was. I couldn't believe the man I was looking at was me, the buff massive mastiff from a moment ago. “I'd be happy to work with you both though!” The corgi came up behind me, her massive body thudding as she walked, shaking the ground a bit. Both ladies gasped at the sight of her, both walking over to her. “Wow! I've never seen someone so big! You must work out a ton!” “I'll say! She takes it to the extreme!” Both retrievers started to walk over to her, but they both stopped, their noses twitching. I knew in an instant what had happened. They smelled her musk. Both moaned lowly, gripping their bellies. I watched as their bellies slowly ballooned out, growing bigger, rounder and tighter. Even their breasts swelled up more, the corgi's musk effecting them greatly. It only stopped once their bellies were as big as beachballs and their tits not far behind. The corgi simply chuckled as she walked over to them. “Dang, you girls got pregnant just off my musk? I must be the manliest guy here if I can do that.” It was like she was rubbing salt in my wounds, knowing that's all I cared about. I watched as the ladies surrounded her and began to pleasure her, feeling up her muscles and huge size. I was broken, a twig of a man that I once was. The rest of that day was a blur. Waking up the next morning was rough, but accepting I suppose. I no longer was huge, muscular or endowed. Looking at the weights on the floor of my room, I picked the smallest and began pumping it. I could get it back right? I sighed as I turned on the TV, only to be greeted by a commercial for the gym. In it, it showed the corgi working out and making everyone buff; only a really low payment to join. Maybe I should take them up on that offer to get ripped. After all, I'm only a twig of a man.