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[b][u][center]The Piranha’s Muscle Slave

For SleepySushiRoll

By Draconicon[/center][/u][/b]

Monsters ruled and humans served under them, though mostly in a willing capacity. It turned out that there were quite a few more people in the human world that were accepting of monsters than Asgore’s people had ever imagined, and, well, there were far more ‘thirsty’ humans that loved the idea of a monster master or mistress. It hadn’t taken long for the monsters to start taking up collections, either one or more, for new attendants to themselves.

As the one that had helped bring them to the surface, Frisk had been the one that many of the monsters had been at least casually interested in, but the one that had eventually collared him was Undyne. He ran his finger along the spear-shaped tattoo that covered the left side of his face, still trying to get used to the feeling of something tattooed over his eyelid, when his mistress pulled on his collar. The sudden yank dragged him forward across the parking lot, almost knocking him right off his feet.

“Come on, twerp. We got exercising to do. Heh, or at least, you do. I’m gonna see if this puny gym’s got any machines good enough for these muscles!”

The piranha woman flexed ahead of him, almost ripping through the sleeves of her shirt despite her slender physique. Frisk was pretty sure that she bought the tight shirts just for the chance to get a good rip in every time that she showed off her muscles. She honestly didn’t seem to be able to help doing that, and the more she could showboat, the happier that she seemed to get.

Still, she was a bit rougher than she needed to be as she dragged him into the gym, pulling him right by the front desk. The monster clerk in charge, a dragon of a beast, sat there with its tail coiled around its legs, and only nodded as Undyne passed by.

“Heh, you’re gonna be working those arms til they turn to dust today, you little dweeb,” Undyne teased. “I want them so tired that you can’t even hug me when you’re done. You got that?”

Frisk nodded, though there was no real chance to break off from his mistress, considering that his leash and collar was attached to her arm. If anyone thought that they could just drag themselves away from Undyne at any point, no matter the reason, if she had even the slightest of grips on you, then they were dead wrong.

So, he ended up standing beside her as she started dragging the weight selector down to the very bottom of the seated bench press. He recognized it as one of the machines that were built for monster muscles rather than humans, and he knew that she had to realize that, too. That said, she still took it all the way to the bottom, the equivalent weight of ten boulders.

“Are you sure that’s a good idea?” he asked.

“Of course! I’m pushing my limits today! Gotta work up a sweat, or I’m not really working out. Ha!”

She laughed, sitting down.

“Why aren’t you working out, huh?”

He pointed to the collar, and Undyne looked down. She had the grace to look embarrassed for a moment, then reached up and unclicked the leash from his collar.

“There! Now, uh, go work out! Your mistress commands it.”

He smiled, and her blush only got worse with him deliberately not commenting about what had happened. She turned her head to the side, huffing to herself as he walked over to one of the human machines not that far off.

[i]Good to see that she’s still herself,[/i] he thought as he settled in, deliberately pushing the weight selector much closer to the lighter end of the spectrum. He knew that, command or not, Undyne would still want to be hugged at the end of the day. He also knew that she’d keep him working for as long as she could, pushing him to his ‘limits’, and if he didn’t keep pushing himself, then she would come and make him do it her way.

The last time that happened, he very nearly ended up in traction from her overenthusiasm. He didn’t want that to happen again.

#

A half hour passed, and despite working on the lowest weights, he was still having an impact on himself. The constant action and effort had definitely started him sweating, and he knew for a fact that he was going to need a shower as soon as they got home. Well, if she let him. Sometimes, Undyne liked to keep him a little ‘slick’ for when they had their fun at their house, and he had no idea if this was one of those days.

He was just starting to move from the machines to the free weights when the piranha called to him from across the gym.

“Hey, dweeb! Get over here!”

Frisk obediently turned, green-stained spear on his face gleaming from the sweat that dripped down his cheeks. He slid through the other monsters and their slaves working out in the gym, eventually finding his mistress at the squat spots. She was grinning, too, her blue skin shining with sweat.

“Hey, I had an idea.”

“Yes?” he asked as calmly as ever.

“Get on the floor. You’re my squat-pad, today.”

“Oh. Yes, Mistress.”

He did blush just a bit at that, knowing what this was going to involve. She hadn’t used him like this in public yet, but it was something that came up from time to time. The piranha stepped out of the way to allow him to get between the large metal bars of the squatting frame, and he lowered himself down on the cushion. No sooner had he gotten into place than Undyne was straddling his head, her feet coming down on either side.

“Alright, shrimp. Let’s see how good your face feels under my butt.”

She pulled the weighted bar off the frame, and immediately he heard the big metal bars groan in relief. How much weight had she put on that thing?

There was no chance for him to get an answer before she was squatting down. Her barely-covered ass, in black shorts that were already damp in the back, came down right over his face.

“Mmmph…”

Frisk’s muffled groan was more of a stifled shriek of terror as her muscular butt came down and almost squished him than anything else. There was a feeling of wet warmth against his face from her tight butt and wet shorts before she was standing again.

“Mmmph, yeah, there’s the burn! Again!”

And down she came, her ass pressing right against his face. He swore he could feel every curve of her cheeks, every bit of the muscle under those too-tight, almost ripping shorts. Everything was there as if it wasn’t covered at all, all the way down to the slight wetness of her sex just a bit further forward.

[i]If she’d change her position just a little…[/i]

But she didn’t. Instead, she stood up, and then came back down. Every time that she sat, there was more of that warmth, more of that wet, but none of the stink that some people would have had from doing that. Instead, it was just the blushing humiliation of being used as a chair. Undyne grunted with the hard effort of the rise and fall, always taking it just that little bit further, always pushing herself harder, and by extension, him.

The fifteenth drop was almost too much, her cheeks pressing down on his face enough that his nose started to slide between them, her ass and her crotch pressing down against his face and blocking out the rest of the gym. For a minute or two, Frisk actually couldn’t breathe, his eyes rolling back in their sockets.

And then, with a mighty heave, Undyne stood up. She tossed the weighted bar back, knocking the frame over in the process, and when the weights hit the ground, they cracked the floor.

The fish, the human, and the rest of the gym all stared at the mess. Undyne looked back, then cracked a nervous smile.

“Eh, you all know how it is, right? Shoddy human work can’t stand up to a real monster’s muscles.”

There was a general grunt and groan of agreement, and in that moment, Undyne yanked him back to his feet, dragging him towards the doors of the gym.

“Why didn’t you tell me that everyone was watching?!”

“Because you like people watching.”

“Not when I fuck up!”

They ran by the dragon, who was only just starting to get notice of the complaints of the damaged equipment. Undyne ran out the front door, and he was forced to follow, barely able to keep up with the surprisingly speedy fish woman.

She was still fumbling with the keys when he reached her at the car, and she was so red-faced that she looked sunburned. The piranha tried four different keys, none of which fit the lock, before she screamed and grabbed for the car.

“UGH! WHY WON’T YOU OPEN?!”

RIIIP!

The car door came off, and the red on her cheeks only got worse. She looked like she was about to throw the door somewhere over the horizon, so Frisk stepped in. He leaned in, nuzzling her arm, and she took a few deep breaths. Eventually, Undyne chuckled.

“Heh...what would I do without you, shrimp?”

She dragged him under her arm, pinning him as if she was going to give him a noogie, then dragged his head further down, just over her hardened abs.

“Now, give these a few licks so I don’t mess up the car anymore, and then we’ll head home. I think someone needs even more training as a squat pad, if ya know what I mean…”

Frisk smiled, knowing what the piranha meant, and helped her lift her shirt up just a bit. He had plenty of work to do, and when they got back to the house, he’d have even more for his tongue to do...but he planned on impressing his mistress.

She was trying so hard, after all.

[b][u][center]The End[/center][/u][/b]

Summary: Frisk and Undyne go to a gym, and Undyne unintentionally causes shenanigans.

Tags: M/F, human, piranha, undertale, undyne, facesitting, sweat, gym, master/slave, humiliation, embarrassment,