Gary’s massive increase in size was just in time for the bodybuilder season, and he was so ready to show off his new size to everyone. His confidence was through the roof, and let him win quite a few competitions easily. He did lose a few, some because Storm was in the same challenge or just wasn’t big enough, but it barely dented the unending confidence the fox had. Because of the competitions and constant cross-country trips, Gary and Storm barely had any time to chat, let alone have a moment with each other. They were itching to have fun again, clearly noticeable in the homoerotic tensions brought on whenever they had to compete against each other. Finally, the time came when they could come home, trophies and prizes in tow. It was nightfall by the time they reached Storm’s house, the place they agreed to settle down at. They barely made it to the driveway when they started kissing each other in the car.

Gary purred as he smooched Storm’s lips wetly. “Finally, we’re back home, done with the season.”
Storm murred as he wetly kissed back, licking Gary’s lips. “And not a moment too soon. One more competition against you, and I think I would just start rawing you on stage.”
Gary licked back, their rough tongues rubbing against each other like dueling pieces of sandpaper. “Same, I bet it would just drive the judges and crowds crazy.”
Storm felt himself. He was so hard in his tight red speedo, his boners bulging in excitement in the tight spandex, making visible lines. “Shit, I’m so fucking hard.”
Gary felt himself too, his own giant dick out of his sheath and bulging his tight orange speedo. “Yeah, me too. Think we can make it inside in time?”
Storm chuckled. “Only one way to find out.”

They exited the car, the only moment they would be separated before joining hands again on the driver’s side. They walked together to the front door, and they were barely through it with the door shutting behind them before they were lip locked together again. Drool ran down their savoring mouths, glistening in the soft lights of the home, and ran down their beefy, sweaty bodies. They embraced themselves in a tender hug, arms wrapped around sweaty backs and dick bulges squished together between 4 thick tree trunk legs. In a sort of tango, they danced their way across the house with the grace of dancers, finding their way to Storm’s large master bathroom.

Storm spoke through a smooch. “I suppose we should wash up?”
Gary moaned as he broke the smooch. “I-I got a better idea.”

The fox leaned to the shark’s right shoulder blade, and let his tongue hang out onto the shark’s skin. His tongue gathered up a bunch of sweat and he was hit hard with the scents concentrated in the fluid. It was oozing with testosterone the shark was just secreting from just being there, posing off in front of him. There was hints of the shark’s musk in there, sharp and pungent but oh, so delicious to take in. It pulled him in, and made him start racing his tongue all over the shark’s body, wanting more and more. The shark was curious of how his mate tasted like, so he gave the fox a test lick. The fur poked his tongue sharply, but it only brought the strong fox odor and seeping testosterone deep into the shark’s taste glands, making him go on a licking spree on them. Slowly, they made their way down each other’s bodies…

As Gary reached the shark’s speedo, he took the direct approach of grabbing the speedo in his mouth in his teeth and tugging it down that way. This made the shark moan greatly in pleasure as his dual weapons slowly got free from their constriction, before finally swinging up from their confinement and smacking Gary in the chin. The hit made the fox stumble onto his giant butt with a hard THUD on the tile floor and causing the bottles in the room to shake around in a mini earthquake. Storm to this opportunity to dive down and tug at the speedo of his sweetheart, pulling them like a shark messing with his prey until the fox’s throbber popped out and got him in the cheek. Both giggled and laughed at the silly fun they were having, before blushing at each other.

Gary had a thought pop into his mind. “Hey Storm? Can I… ask a weird request?”
Storm rolled over to you. “I doubt anything you suggest is weird. Ask away.”
Gary blushed redder. “Can I lick on your tail as you fuck my butt again?”
The shark tail wagged around. “Sounds like a great idea. Let’s do it.”

Before long, they were standing together, the shark behind him with dual rods aimed at his hole. He wagged his tail around to his front side, letting Gary grab it in his paws. The fox gave it a lick with his tongue, and it was filled with loads of collected musk and sweat under the scales. He couldn’t hold back his desires anymore, and just started sucking heartily for it all. This escalated the shark’s lustful desires, and he plunged his cocks deep into Gary’s ass. His cocks bulge out the other side around the fox’s abdominal muscles. He pounded that foxhole to his hearts content, bulging each ab with a poking stab. Gary continued sucking hard on the shark’s tail, enough that it made Storm cum waves of his shark spunk into Gary’s ass. By the end of the load, the fox’s belly bulged out like he swallowed a large yoga ball.

Storm pulled away to look at his progress, cum leaking from the fox’s hole, but Gary surprised him as he used his tail to twirl him around and he soon found the fox’s precumming cock sliding deep into his tight ass. The shark groaned and moaned as his ass was also a virgin and untouched, so it felt so blissful to have his rear entrance opened up for the first time. Despite Gary’s belly making for a difficult time for slamming into the shark, he found a good speed to pound that shark pucker into loose submission and released his hot seed once his knot squeezed into the entrance. The hot spunk splattered into the shark’s gut, and made that abdominal definition go away and be changed to a bulging belly filled with the sticky stuff.

Storm moaned and huffed, surprisingly out of breath. “H-holy fuck, dude. You filled me up a lot.”
Gary purred as he pulled out of Storm with a POP sound, his knot free of the hole. “Just returning the favor you did to make me what I am now.”
Storm murred as a bit of cum spilled from his hole warmly. “It feels real good, just sloshing around in my gut.”
Gary smirked as he patted his gut. “Agreed. Now, come here you.”

Gary grabbed Storm’s hands and pulled Storm forward, their huge bellies rubbing each other as they stretched their necks and their lips touched to kiss again. They were truly in love with each other, both sexually and romantically. They did not want to leave each other’s embrace, and couldn’t imagine being unrelated anymore. They knew what they were… a couple bonded together by muscle gains.

They didn’t need to say a single word as their bodies started to flex like Gary’s did a few months ago. Their blood burned hot and started pumping fast, expanding their vessels out from the skin and appearing down their bodies, including their hard dicks. They rubbed their hands over them, moaning as they felt their bodies hard at work, and about to grow. And grow they did, as they felt their muscles bulk up with their veins pushing up into their hands as they kisses on. They moaned into each others mouth as their cocks got veiny and touched together, lust and strength coming out from their skin and making them pre. Even their nipples leaked a bit of fluid in excitement, and a taste was like pure, concentrated musk and testosterone.

Soon, the lust explodes from both of them, and they start shooting loads of cum from their dicks. It spewed hot enough to steam where it landed, and it made long ropes that went a few feet to the other side of the small room if it didn’t cover their legs in it. They grow big enough that their speedos SNAP apart and land elsewhere, split in two because their legs were so thick now. They were soon out for the count a couple moments later, sleeping cuddled together on the tiled floor for a couple hours.

—–

The shark and fox groaned as a ray of sun passed into the window in the bathroom and hit their faces, waking them up from sleep. They blush when they realized they were still locked in a kiss, tongues and mouths dry of saliva. They broke their kiss and tried to get up, finding some difficulty as their seeds had gone hard and made a sticky mess that required some muscling, an easy feat for the two buff fuckers, to break free from. When they stood up, they looked in the mirror, or at least the parts that weren’t encrusted with cum down below.

Storm eyed himself and his mate. "If my sight isn’t wrong, I think we gained 25 pounds of muscle, at least.“
Gary was calculating fast in his head and answered. "Yep. 25.45 pounds of muscle!” He blushed afterwards. “I-I learned how to eye it out.”
Storm kissed the fox on the lips. “Then I made a good choice making you my mate, huh?”
Gary kissed back. “Yep.”

The shark stretched for a moment, before heading for the shower and getting the warm water running, hardened cum on the floor gets washed down into the drain. He beckons Gary to come over, and the fox trots over, dick bouncing up and down. Together, they notice they got morning wood. Of course, there’s only one way to get rid of that.

Gary put a paw on Storm’s dicks and rubs it the throbbing, veiny length, and playing with the tip. A thought crosses his mind. “Hey, Storm?”
Storm puts his hand on Gary’s dick and rubs the length in return, teasing the knot as he passes it by. “Yes, Gary?”
Gary teases the two tips, which makes the shark groan and start to throb. “Have you… ever thought you’d get married?”
Storm thought as he returned the favor with a finger flick on the fox’s tip, making them throb. “I have not…” The fox sighed before Storm added. “Until now. Are you suggesting we… marry?”
Gary blushed red as he stroked the shark faster, trying to excite them by pleasuring the exposed veins. It works, with large globs of pre dribbling from the tip. “Y-yeah. We seem so compatible, y'know?”
Storm smirked as he gropes the fox’s knot, which makes the fox’s cock dribble pre as well. “Mhm. We like a lot of things and are so close already… why not, let’s do it.”

Gary gasped, and the shock and surprise made him cum hard all over the tile wall. The fox’s hand accidently clutched the shark's cocks hard, so it made Storm fire his loads all over the wall too. By the time the ropes finish, the wall is now off white, and stickily covered.

Gary’s lust finally calms enough that he can stumble out a sentence. “Y-you mean it? You-you’d marry me?”
Storm huffed a bit too, his lust filled mind having a tough time thinking. “H-hell yeah. For love, and for muscle.”

Gary gave up on fighting the lust, letting it control him again as he started making out with Storm again with renewed vigor. Storm returned the favor with many kisses. As they turned, their dicks ended up sandwiched together between muscular guts, humping fast and hard as the air filled with their pheromones as their was steam. The rest of the morning was blurred into a mess of muscular masses pounding each other every which way.