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[b][u][center]The Piranha’s Denial

For SleepySushiRoll

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

“The hell is this thing?!”

Undyne held up the metal belt with barely-contained fury and frustration, the metal almost vibrating between her fingers. It was her birthday, and this was what her boyfriend thought was a good gift? She didn’t even know what the hell the damn thing was, let alone what it was supposed to be for. The blue-skinned piranha woman shivered with confused frustration as she shook the metal belt at the narrow-eyed human.

“You better have a damn good explanation for this. First of all, what even is it?”

“Um…a…a challenge for you,” Frisk said, moving to stand on the other side of the living room table. Not that that would protect him, of course, but it put a small barrier between the two of them. “I thought you might like something to train you harder for your birthday.”

“…Okay, fair,” she admitted, rubbing her forehead. “But still, what the heck is this thing?”

“Okay, that’s good. You’re calming down a bit. No more table-smashy?”

“Not if you tell me what it is. Now.”

“That’s, uh, a chastity belt.”

“…”

Undyne slowly turned her head to look at it, and then back at Frisk. He wasn’t making a lot of sense, but then again, humans were pretty damn bad at that. Monsters seemed to be better at just saying stuff.

Well, most of them. Alphys kinda lost her chance after staying quiet for too long.

“And what’s that?”

“It stops you from touching yourself while you wear it. Down there.”

The human gave a significant look below the waist, and Undyne’s eyes widened slightly as she got the idea. Having her…sex…covered up with something that was this thick would keep even her from touching it, or using it to get off, or anything of the sort. She would be completely restrained.

“What kinda challenge is that? I could –”

“You could rip through it, but it’s a challenge in self-control. I mean, a warrior’s supposed to know how to wait, right?”

“…Yes, but –”

“And you know how much you love that. I can hear you across the hallway.”

The first sign of a blush burned on her cheeks as she remembered the first time that Frisk had told her how loud she was. It wasn’t her fault that she had been so used to the Underground that she had forgotten how to be around other people. It wasn’t [i]her[/i] fault that her boyfriend had such good ears.

Still, it wasn’t a [i]bad[/i] challenge. She had to admit that it was something that she did a bit too often, and she could stand to learn how to hold back for a bit longer. Holding the belt up, she looked it over.

The thing was a steel band for the waist, something that could be adjusted, and a plate that fit over a female’s groin. It would cover her pussy completely, only allowing a little hole where a cloth could be slid in to clean it every so often, and for waste to come out. Other than that, there’d be no contact between it and the outside world.

Somehow, that made her tighten up down there, and she didn’t know if it was in fear or in excitement. Had to be excitement, though. She was never afraid of things, these days.

“Heh, if you think this’ll be hard for me, you’re wrong. I’ll stay in this thing for however long I have to!”

“Good. Because I was thinking two months.”

“…Two…”

“That’s not going to be a problem, is it?”

“Wha – no! I can take that. That’s easy.”

Frisk smiled, holding out his hand for the belt. Realizing that her boyfriend wanted to help her into it, she handed it over and quickly stripped off her jeans.

It was a difficult thing to watch the steel plate rising between her legs, knowing that it was going to [i]completely[/i] shut down her ability to get off on her own. Some tiny part of her [i]was[/i] afraid, but she was doing her best to keep from listening to that part. This was a challenge, and she could beat it.

The belt finally slipped around her hips, and Frisk pulled the band tight, making it press firmly against her skin. The panel of metal pressed up a bit, and he worked it into place, rubbing it back and forth across her pussy a few times before he got it settled on either side. She didn’t quite grimace at the feeling, but the chill metal felt rather nice against her flesh, so it was a mix of pleasure and discomfort.

What was harder to take was the sudden pressure that followed, the way that a band of metal went around either side of her butt cheeks, holding it flush against her from behind. The metal was so close to her that she could almost feel the cold oozing off towards her sex, like it had invisible fingers that were going to be stroking her.

Then, Frisk held up the lock.

“Ready?”

“Yeah…yeah, I’m –”

Click.

The sound of the lock clicking in place right in the front, holding the different chunks of metal together, sent a thrill right through her body. It took everything she had not to moan right then, almost as if she had been hit with a shock from one of Alphys’s old machines. The big blue woman clenched her hands into fists, curling her webbed toes.

“Hoooo, boy…”

“You okay?” Frisk asked.

“Yeah. Never better.”

Even if the only thing that she could think of now was masturbating, she realized. The idea of touching herself had never been so strong before, and she knew that it was entirely down to the fact that she couldn’t actually do it now. She knew that it was all in her head, that she could go just as long as she needed to without actually masturbating, but at the same time, she wanted to have the belt off already.

[i]…This might have been a mistake…[/i]

#

The first month passed with…difficulty, to put it mildly. Undyne had continued her work with some of the humans that formed what they called a ‘National Guard’, but that was hardly something that could take up all her time. When she was training, working up a sweat, fighting with the other men and women in uniform, it was easy for her to keep her mind off of her pussy. It was almost too easy, as a matter of fact, to the point where she was often rebuked for going too rough on the other guys in response.

However, whenever she was at home…

Undyne groaned, resting her head against the wall as she took a shower. The metal belt was still there, and she could feel her inner walls clenching and unclenching, trying to grab onto something that wasn’t there. The slit was hungry for something like a finger, at the very least, or something more if she could make it happen. The piranha woman groaned under her breath, bumping her head against the wall again.

“Nnngh…fuck…fuck…fuck…”

She’d picked up that word since coming to the surface, and she had never realized just how good a word it was until this challenge had started. She wanted the belt off, wanted to do something besides just feel the hunger, the need, the utter desperation that was pouring off of her at all moments of the day.

Worse, she could [i]smell[/i] just how strong her need was. It was even coming through in her sweat, the water running through the oils that stained her scales as she stood under the shower. She could smell her pheromones, her horniness, her arousal in her sweat as well as from between her legs, and that only pushed her harder.

Probably the hardest part of it all was just how sensitive she was starting to feel. The sheer warmth that came from her core was bad enough, but the way that she felt when she peeled her sweaty clothes off was just…something else. It felt like someone’s hands dragging along her body, and she could all too easily imagine Frisk behind her, grabbing her, fondling her, feeling her up as she got undressed.

It meant that she was dripping her juices through the cage more than anything else, sometimes.

Undyne was on the verge of beating her head through the shower wall when she stopped herself, holding both hands clenched tightly into fists. She took one breath, then let it out. Another, then let it out. She could make it through the two months. Even if she wanted to rip the belt off now, she knew that she could make it out the other side. All she had to do was try. All she had to do was try.

She turned around, letting the water run down her back, and told herself that it was going to be okay.

#

[i]It’s fine. It’s fine. It’s fine. It’s FINE. It’s FINE![/i]

It was not fine, and she was groaning as she leaned back on the toilet, rubbing her fingers over her chest, over her flat breasts, along her nipples as she felt every little touch burn through her like it was a stroke along her clit. Her hips thrust in the air, her eyes rolling back as each little pinch and squeeze felt like it was right on the verge of sending her over the edge.

“Nnngh…”

She couldn’t even summon the words as she tried to play with herself surreptitiously in the bathroom at work. Her pussy was a swamp beneath the chastity belt, and she could hardly keep herself from ripping it off at this point. It had been a month and a half, and she was barely able to think of anything if she was not actively fighting and training in the yard.

However, due to the…aggression…that she’d been showing, she couldn’t be allowed out there for more than an hour a day. Too many soldiers were getting sent to the infirmary, and she needed to take a break, or at least, that was what the commanding officers had said. She was trying to be good about that, but it was a hell of a lot harder than it should have been.

Grunting as she tried to pull her hands from her chest, she looked down at herself. She was soaked again, wet from head to toe as if she had run a marathon, yet she had hardly had any exercise at all besides…well…

She hissed as her inner walls clenched again, begging her to give in, to break the bet, to lose the challenge. Her body wanted nothing more than to get fucked, and all the wet droplets up and down her body were signs of that. They reeked of her pheromones, trying to get someone, something, anything to jump on her and let nature take its course. She clenched one hand, and then brought it down.

CRACK!

The toilet bowl cracked under her, and a sudden flood of – thankfully clean – water came rushing out. The piranha almost slid right off the seat, and barely caught herself.

[i]Nnngh…[/i]

Even the cold water didn’t do much to cool her ardor, but it was enough for her to get up. She panted as she walked out of the toilet stall, pulling her shirt back down, pulling her pants back up, and trying to forget about the need that burned like a furnace between her legs. She had never, ever, ever gone this long without getting off since she’d figured out how it worked, and this was driving her mad.

She wasn’t even sure what would happen when she finally hit the two-month mark and she was let loose. She sure as hell wasn’t going to fuck Frisk, not when he had been the one to put her in this and leave her tortured like this. No, he was going to be shit out of luck when it came to fucking anyone.

But…but would she use her toys? Her hands?

What would she…

God, it was hard to think. She groaned as she wobbled to the sink, leaning down and soaking her face with as much cold water as she could get away with without soaking her shirt. Her sweaty body was going to do that eventually, but for now, she had to stay on top of things. Just a bit longer. Just two more weeks.

[i]God, can I even make it two weeks?[/i]

She had to. She had to.

#

The days passed, and the end of the second month crept up on her. She fought to keep focused on training, but her mood varied from focused to angry to almost dissociative. The one thing that was constant was the burning heat between her legs and the constant pressure that it put on her to either find a way to feed it or find a way to think about something else. She was sliding up and down in her seat all the time, and she’d even gone so far as to try and cheat by seeing if a tiny magical spear could fit up inside of her. The answer: it couldn’t.

By the time that the last day arrived, she was half-feral when she approached her boyfriend. He looked like he was going to smirk, at first, but then he saw the way that she was glaring at him. His smile shook a bit, but didn’t entirely die.

“You ready to get off?”

“Cage. Off. Now,” she grunted, biting off each word.

“Sure you don’t want to take the challenge another month?”

“Key. Now.”

“Come on. You have to admit, you’re nice and sensitive,” her human said, reaching up and stroking her neck…

And her gills.

That was enough to take her straight to her knees, gasping as she felt the sensitive flesh flare slightly in response to Frisk’s touch. She whimpered, holding her hands over them, her pussy gushing enough to slime the inside of the cage and soak her pants.

“Ah…ah…”

“Wow…that bad?”

“That…that strong…please…”

“You want out?”

“Yes! YES! I fucking want out! I can’t take it. I need it. Please, please, just let me – let me cum!”

It was humiliating to beg like that, but she had been locked up so long that even that turned her on. Her hips were shaking as she and Frisk got her out of them, allowing the wet jeans to hit the floor. The chastity belt gleamed from sweat, juices, and shining oils, and the air smelled of horny female more than anything else.

Her boyfriend helped her onto the dining room table, reaching for the lock. She grunted, humping forward every time that he made contact with the belt, feeling it come so, so, so close to her pussy and clit. She needed to cum. She couldn’t stop wanting to cum.

“Please…please…”

She begged, getting even hornier from the begging. Even as he finally grabbed the lock, she kept whispering the same little word. Please. Over and over and over again, the word spilling from her mouth until –

Click.

The lock came undone, and she screamed as she ripped it off of her lower body. The belt came free, and was promptly embedded in the wall as she threw it away from her like some hated, horrible thing. She arched her back, thrusting her hips against one hand as the other went up to her gills.

A little stroke along them and she gasped for her. A little squeeze of her clit and she squirted her juices. Not cumming, just splurting things that had been held back for far too long.

It didn’t take long before her tongue was hanging out of her mouth in bliss, and it took even less for Frisk to wordlessly pull out his phone. He held it over her, recording her, and she only laughed.

“Enjoy it…while it…lasts…I’m going to…fucking get you…f-for making me…oh fuck…wait!”

She thrust her hips again, not sure if it was her gills or her pussy that was more sensitive, that needed this more. All she knew was that it all felt good, that her entire body was warm and wet and needy and sensitive. Every touch felt better than usual, and as her fingers darted into her sex, she screamed like a fish on a hook.

“AHHHH!”

Undyne screamed as she kept humping her hand, only for Frisk to reach down, touching her neck. She moaned, whimpering, tilting her head to the side as he stroked his fingers along her gills, adding to the pleasure, adding to the bliss.

“Don’t stop…don’t…so…so close…”

“Do you want to cum?” Frisk asked, his voice gentle.

“Y-yes…”

“Then…cum…”

He found a specific way to stroke along the lines of her gills, and it pushed her right over the edge. The piranha screamed again, arching her back and curling her toes, her eyes clenching tight as her boyfriend pushed her over the edge and kept her there. She moaned, she screamed, and she shivered through the entire intense orgasm.

And then it was done, and she flopped out on the table, hard. She groaned under her breath, huffing and puffing before opening her eyes and looking up at Frisk again.

“That…was…amazing.”

“Heh, glad you thought so.” He smiled. “So, do you want to try for three months next time?”

“…”

“AH!”

He screamed as she literally threw him across the room and face-first into the couch in the living room. He grunted on impact, and muttered something about deserving that. Undyne chuckled, then laid back, sighing.

That was good…but she wasn’t doing that again anytime soon.

…Maybe.

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

Summary: Frisk and Undyne have become a couple after Frisk becomes an adult, and Frisk decides to offer Undyne a challenge. Stay in chastity for two months. She takes it on, but can she finish it?

Tags: F/solo, M/F, Undyne, Undertale, Frisk, human, chastity, sweat, pheromones, need, squirt, nipple play, desperation, horny, wet, dripping, orgasm, cum, denial, time skip,