"NGHAAAAAAGHHH~!" A quick left hook, one that would have clearly hurt a lot if he let hit. So he didn't, dodging backwards and nearly falling on his butt, stumbling his way backwards until he was at a safe distance. Undyne stood there, fist still outstretched, looking disappointed.
Even wearing a pair of boxing gloves, the force of Undyne's strikes was out of this world. A gust of air had blown the poor human's hair back, his normally bowl-shaped haircut instead looking more like a crazy mane... He tried his best to fix up his hair while Undyne stepped closer.
"Come on, human, what's the deal? You're supposed to help me train, not run away from me..." Puffing out her lip a bit, she placed her hand on her hip... a wide, wide hip...
Undyne's body type was basically... like, pear shaped. But like a mutant pear, whose bottom half had completely outgrown the other half. It left Frisk dumbfoudned around her, especially now that he was a little older and more... knowledgeable about that sort of thing. Undyne was 30% muscle, and 65% ass. The other 5% was fish. All of it made Frisk quiver every time he got a good chance to stare at her.
For all of her fighting prowess, Undyne wasn't the brightest, so even with the kid ogling her at all times she seemed totally unperturbed. "What gives?"
Finally realizing that he was supposed to speak, Frisk tried to maintain his neutral expression. Could he say that he was scared of getting hit by her? "Uhhh... I mean, if I just stand still it's not really that... good for training, right? I mean, a real opponent wouldn't just stand around..." Absolutely, perfect excuse, Frisk...
"But you did that all the time during our first fight..."
Frisk blinked rapidly; even back then he was mesmerized by Undyne's figure. It was only later in life that he understood why. Because goddamn that ass was wider than the door. How did she manage to fit into this room?!
"Uuhhhhh..."
"Come on, let me get a few hits in... I feel like hanging out with humans so much is making me soft... and the last thing I wanna be is SOFT !" Undyne smacked her fists together, sending a powerful ripple through the earth, and more importantly, her ass, her asscheeks giving her a standing ovation for her grit and determination.
"I'm gonna die..." Frisk muttered to himself.
"What was that?"
"I said I'm gonna try..." Frisk held up the arm guard, a small shield that Undyne could punch with full force that supposedly wouldn't blow his arms off in the process. But knowing Undyne, if someone bad could happen, it probably would. Girl used to be able to suplex boulders, or crush them with her ass...
Sometimes Frisk wished he was a boulder...
"FRISK!" Undyne held up her hands. "Are you ready?"
"Huh, what, huh...!?" Frisk looked around frantically, once again drifting off into his own little world. "Y-Yeah, yeah...!" Before he could even finish his sentence, Undyne rushed forward, bounding forth with incredible speed. Speed that such a bottom-heavy lady shouldn't be capable of. But Undyne didn't seem to give a shit. The punch was more than enough to knock Frisk off of his feet, especially when he was caught unawares... Or at least, he thought it would.
When Undyne's fist smashed against the shield, it kinda just... sank into the foam core, with only a small amount of force managing to push Frisk back a couple inches. The boy let out a small squeal, expecting to get launched across the room but instead... Undyne was just standing in front of him looking disappointed.
"Uuughh..." she crossed her arms and turned away, and though he was sympathetic to his plight, the growing boy was also starting to feel a stirring in his loins. Undyne walking away was perhaps the thing he liked the most--just witnessing that booty bouncing and clapping with every step, her tight blue pants doing absolutely nothing to contain all of that cake...
"I knew it... I'm totally going soft..." Undyne flexed her muscles a bit. "I mean... I'dunno, ever since we got on the surface I haven't really seen the need to fight so much... and all that aggression I used to have just... poof."
"I mean, that's usually a good thing, isn't it...?" Frisk asked, barely peeking out from behind the shield mostly so it wasn't so obvious he was ogling her.
"I mean, yeah... but... what if I meet some not-so-nice humans and I can't beat the tar out of them when I need to? Being friends with everybody is nice and all but me and Alphys... well, we almost got robbed this week. Only reason we didn't is because I started flexing and getting up in his face... I didn't actually want to hit him..."
Frisk frowned a bit; "W-Well... I mean... maybe you just need to get angry again... I mean... there's bad people out there, yeah... a-as long as you don't kill them..."
"I wasn't gonna kill the dude, I just... I'dunno, I just felt like I couldn't back up my words..."
"How about I say mean stuff to you?" Frisk asked, still cowering behind the shield. Now because she was thinking about ways of insulting Undyne. But the only words running through his mind right now were "butt, butt, booty, and butt". Not very helpful.
"... I'dunno, maybe that'd work..." Undyne rubbed the back of her head, sounding a little unsure but, hey... anything was better than just moping around. "Okay..." she put up her fists, getting in a battle stance. "Let's try it out."
Frisk started backing away, wanting to prepare himself for any aggression. "Okay, okay... uhhh... you... you smell like day-old tuna!"
Undyne furrowed her brow a bit. "I haven't showered yet, get off my back!" She chortled and smiled wide. "Gonna have to try harder than that, buddy..." Despite that, she gave him a swipe, her fist glancing off of the foam shield pathetically.
"Uhhhh... you need to work on your depth perception!"
"Aw, that's a low blow!" Undyne kept smiling, but her fists hit just a little harder. "Come on kid, tear into me!"
"Y-You... uhh... your girlfriend has a fatter ass than you!"
"God, you're so right...!" Undyne slammed her fist into the shield aggressively, then gave it another punch, though Frisk wasn't sure if it was out of anger or just pure, horny energy.
"I bet a guy would do better p-pleasing her... she seems like a size queen... h-how about you tell her that... uhhh... you can..." God his brain was going blank. "You can get 50% off any purchase at pizza butt with the promo code: ASS SLAM!"
Undyne just blinked at him. "That's stupid."
Frisk was trying really hard to be mean, but it just wasn't in his nature--so he went for the nuclear option, something he knew was mean as hell... "Well... you're... stupid... and so is your girlfriend."
Undyne just stopped in her tracks for a moment... and before Frisk could apologize for what he just said, the fish woman rushed forward with a snarling "NGAAAAAAAGHHH!", smashing her fist into the shield and sending Frisk flying across the room, until he smashed against the wall... Leaving a small, Frisk-shaped indent where he landed...
Undyne almost immediately rushed forward, peeling the poor kid out of the wall and setting him down, brushing some of the rubble off his back. "Oh, jeez... Are you okay? S-Sorry, I just... uhh... jeez..." Undyne rubbed the back of her head. "S-Sorry."
Frisk shook his head, brushing some dust off his shoulder and chuckling nervously. "... If there's one thing I learned in the underground, it was how to take a hit..." He smiled a bit, "You okay?"
"Y-Yeah..." Undyne looked away, seeming a little defensive, but for a moment, she seemed to soften up... "I mean, just... I want to start training again so I can protect my friends, instead of just bein' all talk... I don't want to end up... alone... again."
"Hey, you're fine..." Frisk rubbed the back of his head and smiled up at the girl, probably the first time he's looked her in the eyes this entire time. "Come on, let's... let's keep training, so you can get strong again... That was a pretty good punch..."
"Heh..." Undyne smirked down at the kid, offering a hand to help him up. "Sounds good..."
This time, Frisk wanted to fight too. It was a pretty stupid thing all things considered, but if he was fighting back, maybe that would give Undyne some motivation. After all, humans were stronger than monsters, magically-speaking at least. If he was fighting back, it would make for a real training session...
Frisk was... a little distracted, admittedly. His eyes were focused way lower than they actually should be. Totally hypnotized by her door-spanning hips and her constantly jiggling ass. He managed to block her blows for the most part, but he was pretty clumsy about it. Even worse, he was losing his footing every now and then. Undyne was a bigger, wider woman, which meant she just dominated space. So much space...
Frisk narrowly dodged a blow from Undyne, huffing and puffing as he put on the backfoot. "Come on, kid, fight back! I know you like the whole pacifist thing but I need someone who can fight back!"
"O-Okay...!" Frisk gave a few, half-hearted punches that Undyne easily swatted aside... But it was clear he wasn't in the mood to fight back. Which meant Undyne had a chance to mess with him. Silently, she channeled a little bit of magic, taking advantage of the boxing gloves so he wouldn't notice... and before Frisk knew it... he heard something. A magical swirling noise, as something began to fomr underneath his feet.
As memories came hurtling back from the past, he started to back away faster; but it was already too late. The spear shot upward... She had timed it to miss Frisk by a pretty wide margin, it was more for scaring him than any actual damage. But she miscalculated. The spear shot upward, catching Frisk by the pants and shooting upwards... and in the process, ripping his pants in two!
Frisk flopped over, falling on his butt in a heap with his pants ripped to shreds by a magical spear. Undyne covered her mouth, having trouble not laughing at what she thought just happened... That is until she heard a second, much louder, heavier THWAP against the floor nearly a second after Frisk landed.
Finally, she seemed to take notice fo Frisk's body... and more importantly, his boyhood. She expected something more age appropriate... but all her talk about Frisk having some massive balls must have been true, because they were big enough to use as beanbag chairs... and his DICK . Even flaccid, there was no way that thing didn't drag across the floor...
Undyne just stood there in complete shock, while Frisk was flailing and trying to cover himself, babbling incoherently as he tried to come up with a good explanation for what just happened. "Wait, you just... uhhh..." Frisk scrambled to his feet, his cock bobbing around in front of him, still dragging against the floor until he finally stood up straight. An uncontrollable throb surged through his cock, making it lengthen, thicken... and grow even bigger. Undyne was shocked, to say the least...
It loomed over her like a great, throbbing beast. The kid was smaller than her but still just looking at this thing made Undyne of all people feel small for just a singular moment. The normally confident and boisterous fishgirl found herself quivering a bit just looking at it. Whether it was because of her reaction, or just embarrassment, Frisk tried to back away, only making his oversized dick bob and bounce hypnotically in front of her. It was thicker than her arm--by a wide margin. Not only that but long enough to make Undyne wonder how he managed to hide that thing. Tight pants be damned, that kid needed a fucking girdle for that thing.
Frisk's normally calm expression scrunched up a bit, the young boy shaking like a leaf under Undyne's scrutiny, unsure of what she was thinking, or about to say. So the boy just assumed the worse. "S-Sorry, I didn't mean... it's not..." A poorly-timed throb through that beast sent the boy's legs buckling and quivering, making Undyne back up just a bit, her dark blue scales suddenly shifting into a reddish color the more she watched that thing. All she could think about was all the times she hung out with this kid, and he was keeping this thing wrapped up... "It just does this sometimes it doesn't mean anything..." he tried to explain, though his pleading might as well have gone in one ear and out the other.
But most shamefully, there were other thoughts lingerng in the back of her head. Unbelievably lewd thoughts--things she never thought about doing with Frisk, let alone any human but... Undyne loved a challenge. Even while Frisk tried to babble out an apology or attempt to slink away, Undyne was just thinking about what a dick like that would do to her. No lady on this Earth that wasn't an eight foot tall boss monster could take a monster schlong like that.
Put Toriel insisting on living with this kid under a whole new light, to be honest... But if that was the truth, could she really disagree?
"And sometimes I..." Undyne stamped her foot against the ground, sending the whole damn building creaking and groaning from the fish woman's ridiculous strength, and especially sending a powerful ripple through her oversized cheeks, her muscular thighs flexing but still rippling from the impact. Frisk stumbled back, his beanbag chair nuts schlapping against the floor as he landed on his rump, his normally blank expression replaced with wide, beady eyes staring at her with concern.
"Shut up." Undyne huffed, crossing her arms underneath her bust and staring down at the kid in front of her, her bright yellow eyes gleaming with some kind of plan. Frisk had no idea what was going on, but he had the sense that he was in danger. Like he was some kind of prey animal, about to be this pirhana's next meal. "You babble too much, kid. I've seen dicks before..." Brushing a finger through her long, red ponytail she bit her lip a bit, razor sharp teeth on full display. "Never seen one this big, though... well, at least on a kid your size." Asgore was a 10 foot tall boss monster, so he was technically cheating. This kid was barely above four feet and had a dick longer than he was tall.
"How the heck you live with this thing, kid?" Undyne rolled her eyes, stepping just a bit closer, a little huff coming from the kid's lips as she got closer, her presence more than enough to make his cock throb with need, slowly lengthening and growing harder by the second.
"It's, uhh... hard." Frisk said without a hint of sarcasm.
"Well, yeah, I figured as much... but you don't need to tell me what I can see..." Undyne stuck her tongue out at the kid, who puffed out his cheeks poutily.
"No, I meant--"
Undyne interrupted him, stepping just a bit closer, her hands resting on her immense hips as she looked the bowl-headed kid in the eye. "... Can I touch it?" The tone of her voice was unexpected; when Undyne wanted something, she rarely waited for permission before doing it. It was oddly submissive... But then again, this was a sensitive situation.
"H-Huh...?" Frisk's voice cracked a bit as he tried to mumble out an answer, "I m-mean... uhh..." His cock did all the answering for him, growing stiffer, skin drawing back, that enormous rod growing thicker and thicker by the moment. Eventually Undyne wasn't even sure if she could fit the whole thing in her hands, let alone her mouth. But she was practically salivating at the chance to try it.
"If you're not gonna say no, I'm gonna take it as a yes. So don't complain..." Undyne wiggled her hips side to side as she stepped as close as she possibly could, sending a huge throb running up the length of his oversized cock, the boy's tiny legs buckling somewhat under the strain of it all. Kid should have passed out from maintaining an erection like that. But hey, she wasn't gonna complain.
"M'kay..." The kid muttered softly, barely an answer but more than enough to spur Undyne into action.
"Good...~" Undyne gave a little chuckle, crouching down in front of Frisk, whose eyes were still wide as dinner plates, obviously focused on the mountain of ass constantly wobbling and jiggling behind her. Undyne's upper half looked practically vestigial by comparison, the full breadth of her cheeks dwarfing her shoulders by a wide margin. It was even more appealing when she was on her hands and knees, her back arched and huge globes stretching tightly against her poorly-equipped pants.
"I mean, you did me a favor, right?" Undyne reached forward, cautiously running her fingers along the underside of that beast and letting out a little scoff as she felt it throb in response. The thing felt like a ticking time bomb, constantly throbbing and bucking as it tried to get harder and harder, its sheer size putting a strain on the boy, quivering boy it was attached to. "Figure I should repay the favor. That's what friends are for, right~?" Undyne gave him a toothy smirk, showing off her rows of sharp teeth that made the prospect of a blowjob an admittedly scary one. But Undyne wasn't about to hurt her friends...
Both hands were now wrapped around that gigantic fuckstick, and just like she expected, two hands wasn't enough to handle that girth. She would probably need another four hands to really encapsulate this thing. Absolutely gargantuan--it made the little boy it was attached to seem downright adorable with his boyish coos and shuddering gasps. Despite havng a bitchbreaker of a cock he was still a sweet little kid. Funny how that works out.
"Mmmh..." Undyne leaned forward, pressing her cheek against the bulbous cocktip and chuckling as it gave a hefty throb, spurting a clear trail of pre-cum across her scaly skin. "How big are your loads, kid? Just curious~?" She wrapped one arm around that beast, hugging it close while her other hand freed itself to reach down and fondle one of those gigantic, floor-dragging balls. Just one of them could smother her entire head...
Frisk wrapped his arms behind his back, his posture stiff and his expression even more stiff--but that was pretty normal for Frisk. "I'dunno..." he mumbled, so quiet that Undyne playfully flicked her "ears" around and held up a hand.
"Whatsthat...? Didn't hear ya... gotta speak up!" Undyne took advantage of her body, flexing her arm tight around his enormous cock, locking it into a vice between her thin waist and her toned bicep, more than enough to squeeze it tight and let him grind against her.
"I'dunno... mnnnhh... I always have... t-to use the bathtub c-cus I make a big mess..." Frisk puffed his lips out and looked away, seemingly embarrassed about this fact. That was more than enough to make Undyne smirk a bit--this would definitely be a challenge.
"That right?" Undyne leaned up close to the kid's face, and gave him a little smooch on the cheek. "Then sounds like I can handle it just fine..." Frisk's intense blush afterwards was enough to make Undyne lose it, the fishgirl giggling happily as she started to scootch back, her ass coming into contact with the floor, her cheeks clapping and wobbling against the ground every time she scootched back.
Frisk stood there, his shoulders bunched up and his body almost as stiff as his cock, which extended several feet back... until it came to the point where Undyne couldn't even reach the kid anymore. Just his massive, mouthwatering cock.
Sure, she had a girlfriend... but Undyne had a size-queen streak that ran back into her teenage years, and tendencies like those never really went away--especially when Undyne has been challenging herself to take the biggest cocks in the underground for a long, long time. This one wasn't exactly a new challenge, but having it attached to her best friend... who happened to also be a shrimpy human kid... that made things a little different.
"Hehehe..." Undyne placed her hands on either side of that beast, "Might not be able to get very far, but hey... that's... mmmh... fine..." With a playful wink (that least that's what it seemed like she was trying to do), she pressed her lips to the very tip, probably the thinnest part of his cock and still... it was a struggle to even fit it in. There was an obvious tension from Frisk, as he seemed to jolt when Undyne opened her mouth...
But Undyne was an expert, and as dangerous as her teeth looked, she could give some mean head... her lips stretched wide, her lips parting just enough to let the bulbous cockhead pass her lips, entering into her warm depths, the roof her her mouth and her tongue working in tandem to make this lucky boy shiver. A loud gurgle escaped his overstuffed balls, a warning of what was to come...
Undyne rested her hands on the ground, taking advantage of his length, just simply bobbing her head back and forth over the first few inches, letting her lips drag all the way back with plenty of spittle leaving a shiny trail in her wake. "Mmmrhghhl..." The one-eyed warrior forced herself closer, giving herself a greater challenge, shoving just a little more in. A little jolt went up her spine as that thick beast kicked against the back of her throat, her lips already forced open around that beastly girth and her jaw straining around it. "Gllrhhghl..." she pulled back, letting the tip rest against her lips while letting out deep, deep huffs. "Jeez... I might be a little out of practice..."
"Nnnhh..." Frisk was twitching in place, his shoulders bunched up so tight it looked like he might explode, and his eyes watering a bit. "I-It still felt good..." he muttered, still overcoming the miniature heart attack he had when he saw her teeth...
"Hehehehe... I thought you were made of sterner stuff, kid..." Undyne playfully smacked that tree-trunk dick against her cheek, marveling at the wet whap that filled the air, how that overproductive beast happily spurted another helping of pre against her cheek with each smack.
"C-Can I... help too...?" Frisk asked with a huff.
"I know you can suck your own dick, but like... I got it..." Undyne stuck her tongue out at him, which made the kid shake his head rapidly, trying to babble out some kind of explanation before she could come to any more conclusions.
"Oh, don't worry, I would do the same thing if I had a dick this big..." Undyne nestled her cheek against it, treating that piece of meat like a cuddle toy.
Frisk just puffed his cheeks out. "N-No, I meant... c-can I help you... uhm... d-down there... so you can feel good too..." His eyes focused intently on Undyne's backside, marveling at the sight of those enormous cheeks squishing against the ground, always in constant motion. Even the lightest movement from Undyne made them react tenfold, ripples of movement turning into hypnotic jiggling...
"Huh..." Undyne sat back a little, crossing her legs a bit. "... Where you want it?" There was a playful look on her face, her sharp teeth sinking slightly into her bottom lip as she continued to stroke and cuddle against his person-sized cock. It made it very hard for Frisk to use his words...
"... nnhh... I was... k-kinda hoping to uh... you know... l-lick... uh..."
"Speak up kid." Undyne flexed her bicep, wedging his cock against her and forcing a powerful throb out of the kid, that had him bucking his hips needily.
"Uuuuhh..." Frisk grit his teeth. "I-want-to-lick-your-butt!" he blurted out, much to Undyne's surprise... and immediate pleasure.
"Hell yeah, I know you were brave..."
It didn't take long before Undyne managed to topple the kid over, throwing him down to the ground with his pillar of cock standing high. "I was gonna make you do it anyways..." Undyne placed a hand on his chest as she started to crouch down, her enormous ass taking up the boy's entire vision, ensuring that those globes were his entire world for the next few minute... Her pants looked like they were about to burst holding in that much donk, and as Undyne crouched over him, he was quick to start tugging and pulling on her pants while she tended to his oversized boyhood.
"Mmnnnhh..." Undyne looked over her shoulder, still working her lips up and down the first few inches, not even caring for being clean or tryingto do this smartly. After all, with such a big cock you had to throw all thoughts of grace out the window. Nothing involving a cock this huge would be anything but sloppy. So she just embraced it, slurping loudly on that gigantic girth, dragging herself deeper down every time and even letting it just barely enter her throat. But she was barely even a fourth of the way down.
Not that Frisk seemed to mind, he was in heaven. His hands were pawing at her ass desperately, taking big, soft handfuls of fish booty and watching how his fingers sank deep into folds of flesh, which bulged around his arms and seemed to beckon him deeper. Her pants were only halfway off by now, but the boy could hardly help himself, already attempting to stuff his head between those endless cheeks, desperately trying to please Undyne as much as she pleased him...
His hands pinched and squeezed all over, barely putting a dent in those hallway-clogging cheeks, and her double-wide hips ensured that he wasn't seeing anything but butt for a while. By the time her pants were low down enough that he could properly stuff his head between those monster cheeks, Undyne was already experimenting with going deeper. It was wild to even thick about it... her neck hurt just looking at the thickest portion of his shaft down the middle. But hell, she managed to get nearly a foot before she was forced to gag and pull back. "Jeez..." Undyne huffed, looking back at the kid who kept drawing himself deeper and deeper, until finally, she felt his lips nestle against that tight little hole buried deep beneath.
"Nnngf..." Undyne placed both hands on her hips, dragging her tongue in long, slow circles around that fat cocktip, absolutely slathering it in spittle, lavishing it with so much attention... sort of ass an apology for not being able to go so deep... "Hahh... if you want to help, kid, then lemme make it easier..."
And just like that, Frisk was trapped forever. Undyne flopped over, going from crouching to sitting in one simple motion and pinning Frisk underneath a mountain of ass. Her cheeks spread out to either side, pinning not only his head but his upper body, arms included, underneath layers and layers of pillowy softness. The scales added to the interesting texture, and despite his predicament he kept fondling her butt desperately, and more importantly, dragged his tongue in long, slow circles around her quivering asshole.
"Hahhf..." Undyne bit her lip, placing her hands on her knees, making sure not to put too much pressure on the kid. Didn't want to crush him after all. But she could barely see him underneath her own donk, the only indication that someone else was there being the beastly cock extending into the air like a fleshy pillar.
She could hear all sorts of muffled noises down there, moans and coos as Frisk slurped and suckled on her asshole desperately, peppering gentle kisses all over it, his tongue constantly dragging along sensitive skin, every tight clench just motivation for the kid to work harder. "F-Fuffuufu...." Undyne shut her other eye, trying to smirk confidently but finding it a struggle to keep up her confident voice. "You... s-sure seem... e-experienced back there, huh?"
If he heard her, he didn't respond, instead wrapping his lips around that tight little hole, eagerly making out with it the whole time, his slimy, warm tongue trying to wriggle its way deeper into her, push that tight hole wide open and lick even deeper... Undyne would let him, too, all while slurping on the first few inches of his cock out of some desire to return the favor.
The last thing Undyne expected was for the kid to actually make it in, for his tongue to pop past her tight asshole and plunge deep inside of her, as deep as his little human mouth would allow. His tongue curled inward, dragging out a powerful moan from Undyne as he slurped backwards, dragging her most sensitive inner reaches. It was like a hot poker right in her most sensitive regions, that slimy organ wriggling with lewd intent...
But Undyne was getting too excited at this point, and as surprisingly good as Frisk was, she wanted something more . The blowjob wasn't working for her... sure, she could try and choke herself to death trying to take that thing, but she knew there were easier ways to take the whole thing... Not to mention, she was just trying to lube it up.
Now, she was ready . Undyne looked over her shoulder, running her fingers along the slickest portion of his cock, squeezing it lightly and marveling at just how much pre he was leaking. "Hehehe... you're definitely gonna make a mess, kid... nnnhh..." Yeah, he wasn't listening, too busy eating her out like his life depended on it. Undyne enjoyed that feeling for a few moments, cooing and huffing hotly as the kid swirled his tongue around inside of her... But finally she started to pull back.
Frisk got his first taste of fresh air in several minutes, and he didn't even seem to notice, his eyes closed tight and his tongue wriggling around in open air. Eventually, he opened his eyes just a bit, and realized that Undyne had stood up. His face turned to its normally neutral expression for a second, before he looked up. "... What's goin' on...?" He asked, his hair a little messed up from being squished underneath Undyne for the last couple minutes.
"Training time..." Undyne snarked, getting down on her knees once again once she had passed Frisk, crawling forward slowly, her hips wiggling side to side hypnotically and sending her big, blue cheeks clapping loudly with each stride. Frisk slowly sat up, watching intently, and eventually having to lean his head to the side to ogle at her--his dick got in the way.
"Come on, kid, I'm all lubed up... how about you stop playin' around and we can do the big boy stuff~?" Undyne puckered her lips playfully, "C'mon, squirt. Get your tiny dick over here..." she reached over, squishing one hand into a mound of booty and spreading it apart, giving him just a peek at that tight, twitching asshole, now slick with his saliva.
"Not tiny..." Frisk grumbled, starting to climb to his feet, taking a moment to regain his balance for obvious reasons. He stumbled closer to Undyne, or more accurately that huge booty. He could barely see Undyne herself out the sheer breadth of her butt. But hearing her make a little cooing noise when his five foot cock whapped against her cheeks was music to his ears. Frisk held his tiny hand against the base of his cock, which bucked and throbbed in excitement at what was about to happen.
"Y-You sure...?" Frisk asked, smiling nervously as he tried to stand on his tiptoes to see over her enormous butt. Unfortunately, even that was out of the question, as he could only just barely see her ponytail, not even a hint of her head.
"I'm bending over for you, kid, do you want me to beg for it or somethin'~?" Undyne slapped her own ass, the whap that followed more than enough to shake Frisk to his core, and allow him for a brief moment to witness heaven, watching those cheeks wobble in place for several seconds afterwards.
Her ass slammed against his thighs, nearly toppling the boy over, her cheeks going whap against his skin and wobbling wildly with his cock resting on top. "Ooohhh... come on, Frisky, I need it so baaaaaaad...~" Even if she was doing it for a joke , that voice made a shiver run up Frisk's spine, and had his cock grow so stiff that he could barely take it anymore. He bit his lip and tried to stifle a moan...
The silence that followed was deafening , and eventually, Undyne grew impatient. "... You gonna do it or not?"
Frisk jumped out of his trance, "Y-Yeah... on it... haha..." He stumbled closer, and then, started to pull his hips back, breathing heavily as he tried to angle himself in the correct fashion to stuff his oversized cock between those monster cheeks. He shuddered as his cocktip slipped past, her tight glutes flexing a bit just to clench even more firmly around it.
It was an imposing sight for anyone, an ass like that bending over for him. Frisk should have felt powerful and in-control, especially with a dick as huge as his, but his legs were absolutely quivering down there. After all, Undyne was a pretty demanding girl, and he had a feeling that extended to sex...
"Come on, come on... don't have all day, kid!" Undyne licked her lips a bit, bracing her hands against the ground, her boots squeaking against the floor as she tried to spread herself out nice and stable. After all, if she had anything to say about it, she was gonna need all the leverage she could get...
Feeling it press against her backside made a shiver run up her spine, that bulbous cocktip pressing up against a tiny asshole, like trying to stuff a tree trunk through a pinhole. But neither were the type to give up, and soon enough, both of them had found a rhythm. Undyne pushed back, Frisk pushed forward, working his slick fuckstick across her tight hole, putting just a bit more pressure on it with each stroke. Eventually, they could both feel it... Undyne let out a small gasp as she felt herself starting to open up, his cock wedging her cheeks apart and starting to sink deeper and deeper, Undyne's tight walls already welcoming his cocktip with the tightest hug that he'd ever received...
Frisk's legs went stiff, his hands clenching into tight fists... Undyne was doing most of the work, using her powerful legs to push back, allowing Frisk to push deeper and deeper... Despite the tiny entrance, he was sinking in a lot easier than he thought... Her ass absolutely stretched around his cock, hugging so tight that every time he tried to pull back it felt like Undyne tried to pull him back in. "Holy..." Frisk huffed, watching with wide eyes as Undyne's ultra-thick ass slowly approached him. He was getting closer and closer, quivering through every painstaking inch, while Undyne herself grunted and huffed, sometimes sounding like she was about to laugh...
This whole situation was ridiculous, his dick was ridiculous. Why wouldn't she laugh at the absurdity of it all? Laugh at how eager she was to spear herself on this fuckhuge dick? "Guuuhhahhh..." Undyne slammed her fists into the ground, making several divots in the smooth, training room floor, using them as handholds while she shoved herself back. A loud squelch filled the room as his cock hurtled through her insides, practically splitting Undyne in two and most importantly, slamming into the walls of her stomach. Her black tanktop was lifted up somewhat, as her slim, scaly belly suddenly distended around a thick, throbbing dick.
Frisk suddenly found himself nearly halfway in, his teeth gritting and his eyes watering. "U-Undyne..." he grunted, reaching his hands out and, surprisingly, managing to reach those beautiful cheeks. His hands sank so deep that he might drown in booty at this rate, but he didn't care. His enormous balls dragged against the floor as he stood up on his tip toes, managing to angle himself enough where he could finally drag his hips forward and slam even deeper. The sounds of absolute anal destruction filled the room, as Frisk stuffed what amounted to an entire person's worth of dick inside of Undyne, nearly going balls deep, with his swollen, overfilled balls thwapping loudly against her ultra-thick thighs.
"Huhhff..." Frisk squeezed tight, grabbing thick handfuls of booty, using that bouncy butt as leverage to work himself back and forth, sawing that enormous cock in and out of Undyne. The blue fishgirl gasped and groaned loudly, arms hugged around a throbbing cockbulge that had already spread her tits apart and was long enough for her to lean her head against. It constantly bobbed back and forth, her stomach surging back and forth as Frisk eagerly used her butt as a fleshlight...
"G-Gahhhh... that's the ticket, kid... nnh... h-holy shit..." Undyne grinned, showing off her teeth as she looked over her shoulder, finally able to see the kid now that he was practically laying on top of her ass. His body bounced back and forth, her rippling, clapping cheeks sending him hurtling back with every hard thrust, giving him plenty of energy to slam it all back in at once. Soon, his wrecking ball nuts were smacking against her thighs were frequency, filling the room with plaps and thwaps galore.
That little trooper was practically mounted on top of Undyne, his feet barely on the ground, his thrusts carried almost entirely by the immense mega-booty he was currenlty laying on top of. "Ghhnhn..." The kid groaned, gasping as powerful throbs ran along his cock, her tight insides pulsing around it, massaging every last inch of that oversized fuckstick.
"Hahhh... hahhh... T-Think this is the biggest one I've ever taken all the way...!" Undyne admitted, though it was hard to tell if Frisk was able to hear her. The kid seemed off in his own little world, hammering away at Undyne's fat ass with such determination that his expression was beginning to shift to its usual neutrality. With just a hint of strain on his face, he thwapped lopudly against her cheeks, slamming deep and hard, shaking Undyne to the core every time and pushing so deep that she could hug his entire dick at this point.
"Hahh... whatever... you can't hear me~" Undyne groaned, "Come on, kid, push it ..." The fishgirl huffed, and Frisk was more than happy to oblige. He was living a dream right now, balls deep in the fattest ass he'd ever see, his tiny little hips getting lost in that endless ass cleavage and his groundshaking thrusts bashing against her deepest reaches, stretching Undyne taut around him...
"Mnnnhh..." Undyne bit her lip, and arched her back, tensing up a bit as a wave of pleasure washed over her all at once. Every deep thrust forced a powerful surge of orgasmic pleasure through her, plentiful juices squirting from her neglected pussy and soaking the ground beneath them in her excretions... and Frisk barely seemed to skip a beat, silent aside from his panting and occasional groans, singularly focused on fucking this beautiful ass into submission.
Undyne eventually couldn't even stay on her knees anymore, collapsing to the floor with Frisk hunched over her, thrusting downwards like a human jackhammer, driving as deep as he can each time and sending a powerful thwap through the air from his titanic balls smacking against her equally enormous booty.
But even such a determined lad like Frisk would hit his limit eventually... and the gurgling sound that had been constantly sounding from his overstuffed balls was suddenly becoming impossible to ignore... Her only warning was a sudden swelling... and then...
THWAP . Frisk slammed all the way in, his balls clenching tight to his little body as they suddenly unloaded inside of her all at once, a thick blast of cum flooding her insides within seconds. The first spurt intense enough to send her belly bulging from the sheer pressure, and soon Undyne found herself stretched even wider... More and more cum pooling inside of her guts, each spurt like a firehose going off inside of her... A few even hit deep enough that Undyne was gurgling out a small waterfall of cum from between her lips...
Even more, however, leaked out. Thick spurts of the stuff pouring out around Frisk's throbbing cock, even such a tight fit doing little to stop the deluge of thick semen from coating most of the floor underneath them... when he said he needed a bathtub to contain his loads, she didn't know that would mean overflowing it . Undyne rolled her head back and groaned, feeling a satisfaction roll over her body with every glorp and spurt that added another few inches to her distended gut.
"Gahhhhh..." Undyne rolled her head forward, "That's... the good shit..." The redhead fish girl leaned back, lifting her hand up and grabbing the kid by his shirt collar, tugging him up with surprising strength... and grunting as he started to pull out. Her ass clung to him the entire way, pulling out with that monster dick until finally it popped free, her quivering asshole gaping wide, more than enough to let a flood of cum pour between her legs as her stomach dumped all of that cum stuffed inside of her. "Hahhh... jeez... kid... you did a number on me..."
"Nnnhhh..." The kid quivered a bit, his legs twitching and his oversized dick hanging between his tiny legs, nearly touching the floor and absolutely dripping with cum. Undyne set the kid in front of her, letting his cock rest across her stomach so she could run her lips along the tip, slurping up some leftover cum and making the kid squirm in the process. Post nut sensitivity was one hell of a drug.
After enjoying that for a few moments, not even caring that it had been deep-dicking her ass just a few moments ago, Undyne finally popped off. With a big sigh, she rested her cleanest hand on top of Frisk's sweaty head and ruffled his hair up. "... Thanks, kid... that was pretty fun." She leaned down, but instead of smooching his forehead or something motherly like that, she pressed her face against the side of one of his gargantuan nuts and gave them a few playful smooches, making them gurgle loudly and a throb run through his half-erect cock.
"Y-Yeah..." Frisk muttered, looking like he was about to topple over from exhaustion.
"So, same time tomorrow...? I think this'll make for pretty good training. We need to work on your endurance, anyways..." she giggled, "And I don't just mean in the bedroom..."
"I'mm..." Frisk flopped over, his head resting against her still-round belly, though it was slowly draining out now that the initial flood had subsided... "Cool with that..." His eyes fluttered shut, the boy drifting back and forth between consciousness. No surprise a nut like that made him pass out...
"Alright...! It's a date then..."
"Oh, no..." Frisk groaned. The last time the word date had been a part of his life was filled with nonsense and disasters .
But hey, at least he was enjoying time with his friends. Right? Yaaaay friendship...