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"I-I don't know if I can do this."

"You totally can!" Amber gave her fellow female's arm a reassuring squeeze. "I mean, ten minutes ago you were saying that you couldn't POSSIBLY get naked in front of total strangers, but we breezed right past that barrier, didn't we?"

The Wooloo blushed self-consciously, squeezing her bare thighs together and folding her arms tightly across her generous chest. The sheep gal's face was framed by a bushy head of white curls, but the rest of her well-padded body was sheared clean, showing off her smooth black skin -- something which only made her feel all the more exposed. The soft padding of the training room floor felt unsteady beneath her hooves. "Ahh! D-d-don't remind me!!"

"Relax, Willow -- you're doing great. " Amber looked up at her boyfriend. "Isn't that right, Isaac?"

Isaac was doing his best to avoid ogling the Wooloo's well-rounded curves, but from the persistent twitching of his raging erection, it was clear that he was only partially succeeding. The Umbreon stood with his paws clasped behind his back, just as naked as the other two 'mon in the room, his dark gray fur interrupted only by a few ring-shaped patches of yellow. His legs were spread slightly, allowing his swollen ballsac to hang heavily between his leanly muscled thighs.

"Y-yeah." The male swallowed dryly, feeling a deep, familiar ache in his nuts as his eyes roamed over Willow's voluptuous body. His untouched cock gave a needy throb, precum beading at the tip. "You're looking...REALLY good, Willow."

Amber cracked a smile at her partner's obvious distractedness. As her boyfriend's unofficial "trainer", she spent many hours a day making sure his overworked balls remained at a steady simmer: always ready to spill their contents, but always forbidden to do so. The Lucario female was a hair slimmer than Willow, but still had more than enough curves to leave her partner drooling -- and more than enough strength to leave him mewling.

"See?" Amber continued, planting a paw on her bare hip. "The only thing a gal like you needs is a little self-confidence. Believe me: if that clip of you that went viral on the Pokénet is any indication, you oughta be a natural in the Underground League."

Willow squeaked in embarrassment, flinching backwards as though she'd just been on the receiving end of a Headbutt. "Y-you saw that?!?" she stammered, her cheeks burning.

Honestly, everyone in Sinnoh had seen the video. One moment, the curvaceous sheep girl was simply riding the subway. 10 seconds later, she was apologizing profusely to the 4 different males who were now crumpled in the fetal position at her feet, all clutching their flattened ballbags. From all appearances, the female's ballbusting spree had been fully accidental -- a misplaced knee as she was knocked off-balance; two unintended grabs as she tried not to fall; an audible_crunch_ as she landed ass-first on yet another male's lap -- but nonetheless, it was a masterclass in both comedic timing and testicular trauma. Apparently all 4 males had required overnight stays at the Pokécenter to ensure that their 'nads remained in working order.

Willow's unintentional display of nut-flattening prowess had been so skillful that it had piqued the Underground League's interest. On a whim, they had reached out to see if she might be interested in trying out for the League -- and surprisingly, the Wooloo had responded.

As one of the League's newest young stars, Isaac had been asked to evaluate the new recruit's skills and to help her train. And as Isaac's most trusted training partner, his girlfriend Amber had volunteered to help in any way she could.

"Of course we saw the video -- that's how we know you're good at busting balls!" Amber gave the Wooloo an encouraging slap on the ass, sending a visible ripple through the ewe's plump rump. "Though hmm, I guess we don't know if you're any good at sex yet. Got any videos of you sucking dick?"

Willow spluttered, her cheeks somehow growing even hotter. "UHH."

The Lucario giggled. "I'm kidding, I'm kidding! Besides, that's why we're here today -- so we can check out your skills in person. I mean, I don't know if you've noticed yet, but my boyfriend's dick is pretty much BEGGING for your attention."

As though on cue, Isaac's cock twitched, a bead of pent-up pre glistening at its tip.

Willow honestly looked like she might faint. "I...I..."

"Willow."

"I...!"

"WILLOW." Amber stepped in front of the Wooloo, grabbing her gently by the shoulders. "Hey. Take a deep breath. Do you need a break? Do you want to stop?"

"N-no!" Willow looked painfully anxious, but she sounded determined. "No, I wanna try this, I really do! It's just, um...it's a lot to process all at once?"

Isaac nodded. "It's hard! Joining the League takes b--...uh. Guts. It takes guts."

Amber chuckled. "You were about to say 'it takes balls', weren't you?"

"I-it definitely does for us guys!" the Umbreon protested, his black-furred ballsac throbbing with ache.

"Fair enough." Amber turned back to the flustered ewe in front of her. "Okay, well just remember that we can take breaks whenever you want, okay? And you can quit at any time if you're uncomfortable."

"I know." The Wooloo looked down at her hooves. "Th-thanks."

"Now. Seriously." Amber looked Willow straight in the eye. "I think you and I should both take a second to get familiar with my boyfriend's junk."

Willow blushed furiously, but this time she kept her composure. "...O-okay," she meeped sheepishly. "What...what do you want me to do?"

"Here." Amber dropped gracefully to her knees. "Isaac, dear, could you come a little closer?"

The Umbreon did as he was told, taking a few steps forward until his straining cock was only a foot or two away from his girlfriend's face. Amber was just as naked as Willow was, and the familiar sight of that gorgeous Lucario girl grinning up at him made his nuts churn something fierce.

Amber patted her bare thighs, looking up at Willow. "Come on, girl, join me."

Hesitantly, the sheep girl followed suit, lowering herself to a kneeling position. Until now, Willow had modestly averted her eyes from Isaac's nakedness -- but now that his dick was pointed at her face like a loaded cannon, the female couldn't help but look. Her eyes went wide as she stared at his fat pupmakers: two orange-sized orbs that were clearly more swollen than an Umbreon's testicles were ever intended to be. From there, her gaze drifted upwards, following the bulging vein that ran along the length of his dick until she finally arrived at the glob of not-quite-cum that gleamed at its tip.

"...Wow." Willow swallowed nervously. "You're REALLY hard."

Amber smirked. "Well yeah -- he's got two hot naked girls breathing on his dick, and he hasn't cum in a month and a half. Why WOULDN'T he be ready to blow his load?"

"That long?" the sheep murmured to herself, almost in awe.

Isaac bit back a groan, a familiar ache radiating from his spunk-stuffed 'nads. It had been easier to maintain his composure when the two girls were just standing around and talking, but Amber was 100% right: it was impossible to look down at the two curvy, naked cuties kneeling in front of him and NOT imagine them making out around his cock. Just the sight made his balls boil. Truth be told, one of his major motivations for agreeing to this bonus training session had been the hope that Amber might finally, FINALLY let him empty his nuts for once...

...though that didn't seem to be his girlfriend's immediate plan.

"So here's the thing about competing in the Underground League," the Lucario continued, glancing over at her trainee. "There are really only two skills you need to know, and they're BOTH about making the guys moan."

Willow blinked, shaking her head and looking away from Isaac's drooling erection. "R-really?" she asked.

Amber nodded. "Number 1: you gotta know how to make a guy moan in pleasure. I'm pretty confident that you won't have trouble with that one." She reached out, casually hefting one of Willow's bare breasts in her paw and giving it a friendly grope. "I mean, a body like this gives you a BIG head start."

"EEP!" The Wooloo shivered, but resisted the urge to pull away. "B-be gentle, I'm sensitive!!"

"Number 2: you ALSO gotta know how to make a guy moan for OTHER reasons." Amber winked. "And judging from that incident on the subway, I think you've probably got a natural gift for that too."

"Y-yeah?" Willow looked embarrassed again, but maybe a bit proud too.

"So. What we're gonna work on today is how to balance those two things against each other." Amber let go of Willow's tit, instead reaching out and wrapping her paw around the base of Isaac's cock. She gave the needy length a slow, steady stroke. "And the way you're gonna practice that is by sucking off Isaac while you punch him in the balls."

"WHAT?!?"

Isaac shuddered -- half from the sensation of his girlfriend's paw gliding up and down his shaft, and half from the anticipation of the ordeal about to come. His dick spat out a short string of precum, the droplets splattering across Amber's forearm and one of her thighs.

"B-but he's your boyfriend!" Willow stuttered. "I can't suck someone else's boyfriend's dick!"

"I'm letting you borrow him!" Amber insisted. "Seriously, it's fine. Just don't let him cum, alright?"

"But...I..." The sheep fidgeted nervously, eyes flitting back and forth between Isaac's fat dick and his cum-laden nuts. "What if I screw it up?"

"How badly can you screw up a blowjob?"

"What if I make him cum?!?"

"Well you see," drawled Amber, "if you punch a guy in the nuts enough, that tends to stop him from cumming."

"But..." Willow seemed to be coming to terms with the task ahead of her, but she was still visibly anxious. "What if I don't realize how close he is to cumming?"

"...Hm. Fair point, I guess. How about this: if he gets too close to cumming, he'll warn you so that you can focus on hitting him in the nuts." Amber glanced up at her boyfriend. "Right, dear?"

"R-right," he confirmed, despite his testicles screaming at him in protest. He knew from experience that there were few things more agonizing than having an orgasm forcibly punched back into your balls...but then again, that was pretty standard for a "training session" with Amber. He'd trusted his girlfriend to own his balls for weeks now. Why stop just because it was a Wooloo bashing his nuts around instead of a Lucario?

"See? Easy." Amber gave her boyfriend's dick one more warm-up stroke, then pointedly pointed it in Willow's direction. "Now come on -- let's see what you can do."

Willow bit her lip, practically squirming in place. "I...um...!"

"You can totally do this," Amber reminded her.

The Wooloo took a deep breath, then exhaled heavily. "...You're right. I-I can do this." Tentatively she leaned forward, reaching out towards the male's dick.

Isaac gasped as Willow curled her fingers around him, giving his eager length an exploratory squeeze. He'd had hundreds of hours to get used to Amber's teasing grip, but Willow's fingers were just different enough to make his toes curl, and his nuts ACHED with optimism at the thought that this new cocktease might be merciful enough to let him blow his load. He shivered from head to tail as the two naked females each explored his cock for a moment, their fingers running up and down every sensitive inch. His testicles felt like they were made of lead.

"Good." Amber nodded approvingly. "Now wrap your OTHER hand around his nutsac."

"...Like this?" Tentatively Willow looped her fingers around the neck of Isaac's scrotum, gently tugging down on his heavy orbs.

"Almost." Amber grabbed the Wooloo gently by the wrist, repositioning her hand. "You wanna kinda cradle his nuts -- you know, so you can hold 'em in place while you punch 'em."

"A-ah, okay." She shifted her grip, furrowing her brow in concentration. "Arceus, I can't even...I can't even fit them both in my hand."

"That's okay! They don't gotta fit, you just gotta lock 'em in place with your thumb and forefinger. That way you can really wail on 'em with your OTHER hand." Amber smacked her right fist into her left palm for emphasis.

Isaac couldn't help but wince at that meaty sound of impact -- but at least his nuts weren't caught in the middle. Not yet, anyway.

Willow nodded slowly. "Got it. Okay, then what next?"

"Next?" Amber grinned. "Next you suck his dick."

The ewe gave a nervous, tittering laugh, her gaze flicking sharply upwards to Isaac's twitching dick. "Hahaha! Ha. Ohhhhh Arceus."

"Relaaaax, girl!" Amber withdrew her paw from her boyfriend's length, sitting back on her heels and allowing Willow to take the lead. "Take it as slow as you need. Just suckle on the tip to start!"

"Hooooo boy." The Wooloo bit her lip, her face visibly red. "I--...okay. Okay. I'll just...um..."

Isaac did his best to stay still and let the timid female approach him at her own pace...though his cock was doing its best to disobey. The long-denied length twitched and throbbed, spasming and drooling as though that might somehow help it bridge the gap to Willow's inviting lips. The male balled his fists at his sides, trying to ignore the ever-increasing pressure in his nuts. Sure, over the last six weeks he had managed to endure through being blue-balled in just about every way imaginable...but even so, there was something uniquely agonizing about watching the shy sheep girl inch closer and closer, her warm breath washing over his desperate length with every tense exhale.

"Eep!" Willow flinched backwards as a sudden spurt of precum caught her across the muzzle -- a thick rope that caught her from nose to chin. Without thinking, the ewe licked her lips to clear some of the mess away...then blushed brighter than a tomato, freezing in place as she realized what she had just done.

"Ha! Okay, well I guess Isaac's even closer to cumming than I realized." Amber looked up at her boyfriend with a grin. "I guess I did make you hump my ass for like an hour before we walked here, huh?"

Isaac grunted in reply, his cock firing another string of pent-up pre. This spurt landed across the Wooloo's thigh, a translucent streak against her smoothly-sheared black skin.

"All the more reason for you to take it slow, Willow." Amber reached out, gently rubbing the female's bare back. "You're doing great -- just wrap your lips around that first inch."

"U-uh." The sheep gal looked just about ready to faint...but to her credit, she leaned in once more. Willow visibly trembled as she narrowed the gap, but she kept pushing forward, her muzzle getting closer and closer until--

Smooch.

Isaac moaned as the Wooloo's lips met the tip of his dick in a gentle kiss...then he moaned again, louder, as those lips parted around the head of his cock. The Umbreon's balls churned as Willow pressed her tongue tentatively to the underside of his length, sliding it slowly back and forth as she began to explore him.

"Nice." Amber nodded approvingly...and casually let one of her paws drift down between her own legs. "Just like that. Slow and steady, just the tip."

Despite her obvious anxiety, Willow also seemed to be enjoying herself on some level, judging from the way her short tail was visibly wagging back and forth. She gave Isaac's balls a gentle squeeze as she nursed on his aching erection, coaxing out a few more spurts of thickened precum.

"Fuck," gasped Isaac. Gods, did Willow look good with his dick in her mouth. The curvy ewe stared up at him innocently, her cheeks hollowed as she sucked the precum straight out of his heavy nuts. Arceus, did he want to bust a nut down her throat. He could practically picture her gulping it down, surprised but eager, the excess cum dribbling from the corners of her mouth and dripping down her naked body...

"He's getting close," Amber warned.

"Llrrddy?" the Wooloo asked around a mouthful of cock.

"Hhhhh." Isaac tore his eyes away from the cutie sucking his dick, trying to maintain his composure. He could feel the pressure in the base of his dick as his cum fought to escape. "Y-yeah, I don't...ghh...don't know how much longer I c-can...!"

"You ready, Willow?" Amber's voice was firm. "It's time. Punch him in the balls."

Willow's eyes went wide -- but the trainee did as her instructor ordered. Hesitantly, she hefted Isaac's nuts in her left hand, and let go of the base of his dick with her right. She curled her fingers into a fist, and with a wince, tossed her hand forwards--

SMACK.

Isaac grunted as the female delivered a light blow to the ballsac -- enough to make him twitch, but nothing compared to the heavier slap of, say, Amber's footpaw rocketing up into his nutbag. His unspent load continued to boil in his balls, his dick quivering on the edge of eruption.

"Again," said Amber flatly.

"Gggnn?!" the Wooloo protested, looking more sheepish by the second.

"Yup. Again."

Cringing, Willow pulled back her fist a second time--

THWAP.

Isaac grunted again, but if anything the second blow had been even lighter than the first. The pleasure still easily outweighed the pain. And with the ewe's muzzle still wrapped around the first inch or two of his desperately twitching length, the Umbreon was getting dangerously close to emptying his balls.

"Harder," Amber insisted, a bit of an edge in her voice.

Willow spat out Isaac's dick for a moment. "...Really?" she asked, sounding more than a little uncertain.

"HARDER," the Lucario repeated. "Like you mean it!" She gave her trainee a hard smack on the ass, as if to illustrate.

Willow squeaked, but did as she was told, throwing another jab at Isaac's vulnerable nutsac.

THUNK.

Isaac let out a wounded groan this time, hunching over slightly as a bit of that familiar nausea spread through his gut. Honestly, the sheep gal was still barely hitting him -- but any time he was this close to an orgasm, every hit in the 'nads felt three times as hard. That said, he could still feel his arousal climbing despite the pain. His length throbbed needfully, firing several more sticky strings of not-quite-cum across Willow's tits and thighs.

Amber shook her head, clearly unsatisfied. "Put some OOMPH into it!" she demanded, finally withdrawing her right paw from between her thighs so that she could slam it into her opposite palm. "You're here to bust some balls, right? Then bust his damn balls!"

"But I-I-I don't know if I can!" Willow stammered, suddenly sounding distressed. Her earlier anxiety had returned, and with a vengeance. She stared wide-eyed at the male's raging erection, frozen like a sheep in the headlights.

"Punch. Him."

WHUD.

"HARDER!"

THUD.

"Ghh!" gasped Isaac. The ache was rapidly growing -- but not enough to offset the pleasure. His dick was still brushing occasionally against Willow's lips, and after a month and a half of endless edging, that little bit of friction was enough to leave him teetering on the edge of ecstasy. He could feel his balls boiling over, cum creeping up his shaft inch by inch--

Amber could tell her boyfriend was worryingly close, and it was making her increasingly agitated. "AGAIN," she shouted. "PUNCH THE CUM BACK INTO HIS NUTS."

WHACK!

"I-I'm sorry!" squeaked the Wooloo, trembling. Her gaze flicked back and forth between the two fat nuts held in her palm, and the thick cock that was mere seconds away from drowning her in endless ropes of cum.

"THEN PUNCH HARDER!" Amber barked. "PUNCH LIKE YOU FUCKIN' MEAN IT!"

"Fuck," whispered Isaac, shaking with effort as he resisted the urge to bury himself balls-deep in the ewe's throat. The tension in his groin was absolutely unbearable. "F-fuck, I--!"

It was all too much -- and finally, Willow snapped. "But I--...but I--...I-I CAN'T DO THIS!!" squealed the sheep, twisting her whole body and lashing out in fear and frustration--

WHUMP!!!

For all that Isaac got thumped in the balls dozens of times per day, it was extremely rare for Amber (or any other training partner) to actually hit him full-force. For one thing, Amber didn't want to accidentally neuter her own boyfriend. For another thing, she had many kicks and slaps and squeezes to dish out from dawn 'til dusk, and she needed to pace herself in order to avoid getting tired. Constantly busting Isaac's balls was hard work!

Willow, on the other hand, had neither of these concerns -- and so her fist came thudding into Isaac's ballsac like a fuzzy sledgehammer, powered by nerves and frustration and 110% of the Wooloo's surprising strength. She caught the Umbreon's cum-stuffed orbs squarely across her knuckles, utterly crushing his swollen testicles into the waiting palm of her left hand. The rubbery spheres deformed around the brutal blow, squirming against her fingers as they tried to escape from the agonizing pressure. Isaac's dick pulsed and fired a blast of precum: a burst of semi-opaque droplets that had been physically forced out of the male's flattened spunk-tanks, and which splattered messily across the sheep gal's face and chest.

For Willow, the impact felt like a lot like punching a water balloon, thanks to the six weeks of unspent Umbreon cum that helpfully cushioned her fist. For Isaac, on the other hand...

"Arceus!" squeaked the Umbreon, his voice cracking and his 'nads threatening to do the same. Immediately his legs gave out from under him, and shakily he toppled to one knee, an apocalyptic level of nutpain radiating outwards from his groin. His paws shot to his battered ballsac. "My fucking...nnnnghhh!!"

Willow flinched backwards at the sudden spray of almost-cum, as Isaac painted her entire upper body in sticky droplets of liquid frustration. "Oh!" the sheep girl exclaimed, clearly surprised at her own strength and at Isaac's immediate reaction.

"THERE we fuckin' go!" Amber beamed with pride. "THERE'S the gal I saw in that subway video!"

As usual, Willow was blushing up a storm...but for the first time in the whole training session, she was also smiling. "Ha...y-yeah!" she agreed, uncertain at first but gaining conviction as she spoke. "Yeah, that felt...that felt good!"

"My nuts," croaked Isaac, continuing to slowly crumple into the fetal position. He wound up with his head in Willow's lap, nearly faceplanting in the female's crotch as he toppled ungracefully to the ground. His denied dick spat another rope of precum across the training room floor as wave after wave of nausea crashed over him. "Hhhhhhhgggghhh..."

"Hang in there, stud." Amber reached out, stroking her boyfriend's back reassuringly as he writhed in place. "Man, that looked BRUTAL. Good thing you've got balls of steel, huh?"

"Fuck," the male continued, still clutching his scrambled manhood after his near-neutering. At least he could feel two distinct orbs -- though he could have sworn they had literal dents from the force of the Wooloo's punch.

Willow looked down at the mewling male in her lap, still somewhat in awe of her own power. "I, um." She reached out with a hand, then stopped, unsure what to do. "Should we...help him?"

Amber shook her head. "He'll be fine -- you just gotta give him a minute. Seriously, you'd be surprised how much abuse a guy's balls can soak up."

"I-I see." The ewe reached down cautiously, giving Isaac what she hoped was a reassuring pat on the head. "Well um...th-thanks for helping me train, Isaac."

"Gnnf," he gasped weakly, his muzzle now buried between the sheep gal's thick thighs.

Amber chuckled. "Well once he comes back to his senses, you can thank him by giving him another blowjob. We're gonna do a few more reps of this so you can REALLY get a feel for it."

"More?! Are...are you sure he can handle that?" Willow craned her neck, trying to catch a glimpse of Isaac's junk. "Are you sure his BALLS can handle that?"

The Lucario stuck out her tongue. "Oh yeah. We've got this gym for two whole hours, right? We're just getting STARTED."

With his flattened 'nads aching and his stiff dick throbbing, Isaac let out a weary, shuddering groan. It was going to be a very long afternoon.