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Jack left his Interplanetary Law class with the feeling he had never been more bored in his entire life. His professor, a dangerously thin primate from the Castor star system, was so old he might as well already be dead. His frail voice had been droning on about all the specifics of which society's justice system would apply depending on the physical location of a ship, the make-up of its crew and the nationality of the entity owning the ship itself. It was all exceptions upon exceptions that Jack would have to remember for his test in three weeks. For now though, he was free to go, and on his way to the gym.

Jack was a human male, born on Europa, one of Jupiter's moons. The athletic young man was now studying law in a relatively respectable university on Earth after his family basically forced him to do so, hoping he would have a better life than mining rare metals like the rest of them. He didn't care much for his field of studies but he agreed it would be much better than any job back home.

After a quick change of clothes at the locker rooms, Jack decided to warm up with some running on the treadmill. At this time of the day, the gym was relatively busy, with students and some professors using the time between classes and supper to do some exercise. He spotted an anthro fox he recognized from one of his elective classes on a stationary bike nearby and waved at him. Jack liked the company of Def in his history class, the lean orange-furred fox was smart and always had a generally positive and hard-working attitude. Def waved back with his rainbow colored claws catching some of the artificial lights, giving the human a shy smile then focusing back on his training.

Deciding that he was sufficiently warmed up for now, Jack headed to a squat rack, knowing it's safer to start with compound exercises while he still had all his physical energy. He was on his second set when Def started an exercise with some barbells nearby. The fox was leaning forward, trying to pull the light bar back towards his belly button in a bent-over row, but his back was rounded and all wrong.

“Def," Jack said. “Def! You're going to hurt yourself dude."

“What do you mean?" The fox tilted his head a bit, now standing upright with the weight on the floor.

“Your back was all rounded, you gotta tighten your abs when you do this so that your back stays straight".

“Oh right!" The fox laughed, running a hand in his short spiked hair. He leaned down, took the weight in his hands, started leaning forward with his back even rounder than before.

“Oh my god dude," Jack said.

He walked to the fox, put a hand on his shoulder and another one on his back, trying to straighten him out.

“That feels much better, thanks!" Def exclaimed. Jack watched him as the lean vulpine finished his set, worried his form would break again. Somehow, the fox didn't show any hint of exertion or sweat but Jack brushed it off to species differences.

“You might want to consider getting a trainer to show you the ropes," Jack said. “It helped me a ton when I started training and the kinesiology students do it for really cheap too!".

“You seem to be pretty knowledgable yourself," the fox replied. “I'm a bit too embarrassed about my strength to ask one of these jocks from the kino program, is there any way I could convince you to give me a bit of guidance instead? Maybe later when there's less people around?" the fox asked sheepishly.

Jack couldn't say no. Even if the human was more into masculine guys, he had to admit Def was cute and it was hard to resist his sad puppy eyes.

“Yeah alright, let's use the group training room tomorrow at 2100 or so, it's always empty on friday nights." Jack said.

“Awesome, I'll meet you there!"

—

The following day, Jack headed to the gym after eating his dinner, in a good mood since he'd get to show off. He always had a bit of an ego problem, but then he also thought there's nothing wrong with a bit of pride in one's body.

Jack picked up a pair of dumbbells then entered the group training room at the back of the gym. As he suspected, the large area was empty except for the anthro fox doing some stretches in front of the mirror wall. He was wearing some sort of athletic crop top probably meant for women since it showed his creamy stomach fur, as well as a pair of athletic form fitting shorts. Def spotted the human in the mirror and waved at him with a smile.

“Thanks so much for helping me Jack!" The fox said, getting up from his stretches and sauntering towards the human. “Where do we start?"

“If you're already warmed up, I thought we could work on your core, it will help you keep good form in pretty much all exercises." Jack explained.

He walked to a pull-up bar, the fox following him, and gripped the bar with his hands.

“Here's one exercise I like, leg raises," he continued. “You can lift either just your knees to your stomach, or try to keep your whole legs straight and lift them as high as you can while controlling the movement back down. Knees only will be the easier variation if you want to try starting with that".

The fox was very focused on watching the human's body, but made no move to try on his own.

“So uh, you wanna give it a go?" Jack asked.

“Oh right yeah sorry!" Def replied. He gripped the bar and started raising his legs up then down, with a perfectly controlled movement that seemed to require almost no effort. Jack noticed the faint outline of abs under Def's creamy stomach fur and was distracted for a moment.

“Damn you're a natural!" Jack said as Def completed 30 perfect leg raises.

“Thank you! It was easier than I thought. Do you have anything harder though?", the fox replied.

Jack's ego was taking a bit of a hit, he expected to impress the lean fox but so far it had been the other way around. “Alright yeah I have something harder for you", Jack said.

He gripped the pull-up bar again but wrapped his legs around it, then let his hands go. He was hanging upside down with his arms crossed on his chest.

“This is an upside down crunch, it took me a while to be able to do them!" Jack exclaimed as he started to pull his upper body up then down.

The fox watched in silence as the human tried to do as many reps as he could to impress his friend. He was having more and more trouble lifting himself up when Def said, “Wait sorry I got distracted, can you do a few more?"

“Ugh, fine," Jack replied. He focused and tried to raise himself, once, twice, but three times was too much. “Alright I'm done, your turn" he said.

He tried to unwrap his legs from the bar only to suddenly feel a tight grip on his ankles and a form fitting pair of shorts in front of his face.

“Come on, I'm sure you can do a few more for me, please?" Def said with a coy smile.

“Dude, I'm toast, and I got your crotch in my face," Jack replied.

“Is that a problem?"

“It is if I catch you."

“Then I just need to not let you go," the fox grinned.

Jack, still upside down, felt one of the fox's arms wrap around his legs, securing them in place, while another arm snaked around his waist, pressing his face against Def's shorts. He could feel something hard against his face and saw a small spot of wet start to spread.

“You're having fun right now but you'll have to pay me back for this", Jack said as the fox started rubbing his crotch up and down Jack's face. The smooth fabric felt nice and it was getting a bit of lubrication from the pre. For a moment, he imagined himself being dominated by a strong muscular guy, then he remembered who he was dealing with. He felt he was entitled to be the dominant one, even though he appreciated the scent emanating from the bulge in his face.

“You know what? I'm curious what you have in mind for payback," Def said with a smug smile as he let go of Jack's waist and legs. The human promptly got down from the pull-up bar, taking a moment to let the blood in his head go back to his body.

“You got it, you orange mutt" Jack said with a smile before pouncing on the fox. They landed on the matted floor and the human quickly got a hold of the fox's wrists, holding them above his head straddling him. “Not laughing anymore now are you?" Jack said. Def answered by leaning forward, leaving a small peck on the human's lift then suddenly tensing up. The fox's legs wrapped around the human's chest in a show of impressive flexibility, then pulled the human down on the ground. In a few quick movements, the fox was now the one straddling the more muscular man.

“Dude, when did you get so strong?" Jack asked.

Def leaned forward slowly, his muzzle almost touching the human's ear, and whispered “Always has been".

Jack then felt the fox's slippery canine tongue invade his mouth, exploring every corner and almost reaching the back of his throat. He tried to push back with his own but no luck, his tongue lacked the flexibility and the strength just as his body did apparently. The french kiss lasted a few more moments before they were almost out of breath.

Jack was getting angry at how easily the lean fox with the crop top and rainbow colored claws was dominating him. In a surge of energy, he pushed with all his might but barely raised himself an inch of the floor before being put back down.

“Tell me, my strong primate," Def said with a smile. “Do you remember the part of our history class about my people's first explorations into space?"

“Uhh not really", Jack said. “Something about a colony that was thought lost or something."

“Exactly," Def said. “See, the first colony ship crash-landed on the wrong planet, one with a gravity almost twice as high as Earth. The colonists were considered dead for decades."

“Yeah sure but what's that got to do with anything?", Jack asked, still offering a struggle now and then.

“Well, they survived, and their bodies adapted to the high gravity by becoming denser with muscle in exchange for higher nutrition requirements. They look thin but they're basically twice as strong as the average humanoid of the same size."

Jack started laughing. “I never stood a chance, did I?"

“Nope, but that's okay, I appreciated the effort you put in. We're not done yet anyway."

“You assho-" Jack's complaint was muffled by a hand on his mouth as he was being repositioned on his knees and hands.

“You want this right?" Def asked. Jack nodded. “Perfect, because I love putting jocks like you in their place."

Jack felt his shorts being yanked down, then a slippery canine tongue once again. This time however, it was exploring a much more sensitive spot.

The fox's tongue was going up and down his taint, passing near his hole but never actually going in. Def's hands were gripping the human's thighs hard, with the colored claws pressing lightly on his skin. Then, the tongue entered him, a warm muscle invading his most personal space. He felt it twirl, bend and spread viscous saliva all inside him.

“Fuck dude," Jack said.

“With pleasure dear," Def answered.

Jack heard the sound of fabric shuffling a bit, then a pointy warmth against his anus. Def pushed and it slowly entered the human, the tapered tip making entry easy and smooth. It wasn't the girthiest dick Jack had taken but it definitely was the most pleasurable. The shape of it was hitting all the right spots as it went deeper and deeper inside him.

Def went deep then almost pulled completely out, over and over, taking his time.

“You're such a good boy," he said. Jack could hear the fox's smile as he said so.

“Fuck yo-," he tried to reply, before feeling the anthro fox's warm body on his back and a hand gripping his mouth once again.

“This is a Christian gym, Jack. No swearing," Def said. Jack could only produce muffled sounds in the fox's hand in response.

Def pumped faster and harder, one arm wrapped tight around the human's body, the other one covering Jack's mouth to prevent any more profanities from coming out. He didn't actually care about those, he just didn't want to attract any unwanted attention.

Jack could feel himself getting close, and tried to get one of his hands off the ground to wrap it around his cock, but the fox's hand gripped his wrist and placed it back down.

“Don't worry about that dear, I'll take care of it. Just don't make too much noise when you come." Def said.

True to his word, Def's hand had left the human's mouth and was now pumping his hard erection at the same rhythm he was fucking him. Jack's senses were overwhelmed between the fox's dick hitting his prostate and the hand gripping and pumping his cock. Soon, it was too much and he climaxed, almost seeing stars as he let himself come in the fox's hands and embrace.

Def felt the human's body around his cock spasm and grip him harder and he came too, pumping his semen into the larger human, his prey for today. His orgasm lasted half a minute before he let himself slide out of Jack's body.

They laid on the gym floor, Jack feeling the soreness of his workouts and a valuable lesson about appearances. He placed his head on Def's stomach, now slightly damp with sweat, while the fox's hands were stroking his hair gently. Jack had a feeling there would be more of this to come soon.