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About a week had passed since Knuckles and Rouge made their deal and the bat officially moved into Knuckles' housing on Angel Island, just next door to the Master Emerald altar. The house was large with many spacious rooms. More than enough to hold all of Rouge's belongings from her penthouse and would certainly be fit for raising a family, perfect for what the two had in mind. And just as the bat hoped, the home was indeed fully functional, having electricity, plumbing, heating, and cooling. And even better, those last four things are limitless in usage, thanks to the house's creator, Tails, being a master of engineering.

The echidna and bat had finished unpacking all of Rouge's items on the final night of that week, having successfully transported all of them from her penthouse in Night Babylon's hotel and officially placed them within the island house. Knuckles and Rouge worked with haste and diligence to accomplish that task by then, not doing anything else that entire time, as the tan-skinned bat would not begin her 'business' with the red echidna until all of her items were in proper spots in her new house. So the sooner they could finish, the sooner they could get started. Suffice to say, though, all that focused hard work exhausted the two and they did not waste any time getting into bed and fell fast asleep that night.

When morning came, with the rising sun beaming its lights into the house through the windows, the male echidna woke from his slumber and stretched his arms as he sat up in the bed. Knuckles looked over to his right to see Rouge lying next to him, still asleep with her back to him, and he could not help but keep looking at her. For his entire life, the crimson echidna lived on his own, in the wild, with no one but himself to call company with the exception of Tikal, who even then was a minor presence in his home life.

Suffice to say, Knuckles needed time to process the fact that he and Rouge were together for the rest of their lives, living in the same house, and had slept together. Once he had processed this major turn of events in his life though, Knuckles smiled while still looking at the sleeping Rouge. At that moment, the bat turned her front toward Knuckles in her sleep and began to awaken, slowly opening her eyes whilst lifting her head up from the pillow, catching the echidna looking at her with a grin.

"Mm... What are you smiling about?" a half-awake Rouge asked, and then smiled back at the echidna.

Knuckles blinked twice and shifted his pupils left and right at Rouge's question. "Oh! Uh..." Knuckles thought for a moment but then narrowed his eyes with a cheeky smile. "I just couldn't help but find it amusing how cute you look asleep." Knuckles answered in a teasing tone.

"Heh... You think I look cute when I'm sleeping?" Rouge teased back, lifting her torso up with the sheets still covering her torso.

The echidna looked back with shrunken irises and a sweat drop. "...Well... You know what I mean." Knuckles planted his right palm to his forehead, prompting a laugh from Rouge, and move his hand to rub his sanded eyes "I wasn't expecting you to wake up so soon and suddenly. I thought you bats aren't 'morning people'".

Rouge raised both her arms up to stretch and yawned. "Normally, no. We're most active at night and like to sleep-in for the morning. But I worked as a government agent for a good part of my life and had to wake up early in the morning most of the time." Rouge rubbed her eyes as she explained. "I just can't believe you woke up before I could..."

Knuckles hopped off the bed, notably naked, and immediately began exercise stretches, starting with the arms. "Well, of course I would. Being the Guardian of the Master Emerald doesn't allow for much sleep, so I've had to wake up as early as possible for most of my life."

Rouge chuckled. "Oh, that's right! How silly of me to not consider that."

The bat squeezed her eyes shut and lifted her shoulders to stretch her wings, from which tiny 'pops' are heard from each joint in the wings. Rouge breathed a sigh of comfort and looked back at Knuckles, who was now doing the 'toe touch' stretch, and in doing so indirectly gave Rouge full view of his balls from the back. It then became the busty bat's turn to stare as she gave those stones her full attention, watching them bob up and down as the red man stretched downward, and formed a grin that got increasingly bigger.

"Well, since we're both up, let's go enjoy ourselves some breakfast." The bat woman used her wings to get off the bed and landed on the floor with both bare feet, but unlike her male partner Rouge had slept with clothing on; a pure black lingerie with a see-through covered the bottom of her solid bra to just below the black G-string. "How do you feel about scrambled eggs?"

Knuckles got back upright from his stretch. "I don't think I ever had those..." The echidna then turned himself to Rouge "But I can definitely give those a try!" On finishing that sentence, Knuckles saw the massive, mischievous grin the bat had on her face and almost instantly raised his brow in realization. "Wait a minute... Do you actually mean...?"

Knowing what the question would be, Rouge nodded with a slow, downward bow of her head to confirm his suspicion. "I told you that I would start busting your balls as soon as I moved in with you, which wouldn't be official until all my belongings were unpacked. And since we finished unpacking all my items last night, we're long overdue for the busting of your balls." Knuckles lowered his head down with solemn acceptance, remembering Rouge's words that night. "But first let me get out of this darn thing..."

The well-endowed bat grabbed the shoulder strips of the lingerie and pulled upward. Knux ended up getting a good and lengthy look at Rouge's underboobs as the bat's immense breasts moved up with the lingerie and delayed her removal of the undergarment for a good bit, the see-through cover not mitigating the view for the echidna in the slightest. After a few seconds of struggling, the winged woman got the lingerie off of herself, her massive jugs bouncing up and down upon being freed, and dropped the alluring top to the floor.

She then pinched the sides of her G-string and pulled them down to her feet. Rouge then stepped her left foot out of the G-string, but lifted her right with the underwear hanging by the toes, giving her echidna mate a good look of her plump bat pussy as she tossed the thin panty away with her foot.

"Ahh~! That's so much better." Rouge said with a relieved tone, while Knuckles cracked a grin with a bulged sheathe.

"Heh, I take it you're one of the women who hates clothes?"

The tan bat nodded. "Mhm! I never got why we women have to wear clothes while you men can go anywhere with only gloves and shoes. Only reason I wore that lingerie to bed was because I didn't want to 'overwhelm' you on our first time sleeping together."

The spike-fisted man scratched the side of his head with a small blush. "Well, you were effectively naked in that, so I kind of got 'overwhelmed' anyway." He gave a tiny chuckle.

Rouge playfully shrugged. "Eh, all clothing is the same to me. Though at least lingerie beats that damn jumpsuit..." She then placed both hands to her bare hips. "Now then! These skillets are warm and well buttered..." the bat twiddled her toes to emphasize her feet. "Just spread your legs wide while standing tall and put your hands behind your head, and I can start cooking those eggs."

Just like that, Knuckles' grin was replaced with a nervous frown, but the last echidna sighed and did as the shebat said: spreading his legs as far apart as possible without going too low. He placed his palms to the back of his head. "Okay... They're all yours..."

Rouge nodded in acknowledgement and reared back her right foot, with her eyes locked onto Knuckles' red fruit. She took the time to adjust her aim so that she would strike the babymakers at their absolute center, and she carefully measured the power of her upcoming kick to ensure absolute pain without outright destroying them.

During that moment, Knuckles looked down at his prized sack to take in one last sight of them in their prime, before the undoubtful change they would undergo from the bat's foot. Rouge was famous for being able to break steel with her kicks. But then his eyes bolted open as he saw just how vulnerable his testicles were at that moment. With his thighs no longer directly beside them, his balls hung freely and all alone, with nothing else to absorb any of the impact. And thanks to the tropical weather of Angel Island, his scrotum had become as relaxed as possible and hung as low as it could, which meant even less protection for the echidna testes. All of a sudden, all the courage and composure the guardian had been prepping since a week ago had disappeared. He could only squeeze his eyes shut in complete panic right as Rouge swung her foot forward.

'POW!'

The bat's tan foot had hit their mark, striking the central bottom of the echidna scrota, and thrusted them up against Knux's pelvis with incredible force, enough to lift him off the ground for a split-second. The man tightened his closed eyes and bit his lip as the pain surged from his nuts, to his pelvis, and all over his abdomen. Meanwhile Rouge was the polar opposite; her eyes wide opened and had the biggest smile with her tongue out, as she felt those orbs flatten against her foot and saw her partner's face at the moment of impact.

Rouge kept her foot up Knux's crotch for five seconds to get in a good squeeze on the tenders, rubbing her nether all the while, before she retracted her leg, allowing the orbs to descend back to their normal state but with a notable bruise underneath. Immediately after, Knuckles moved his hands to his jewels in a swift motion to cradle them and fell over to his front, landing on his knees and hunched his entire upper body low to the ground. The echidna then screamed for a lengthy time and began to groan aloud while rocking his body back and forth to try and soothe the pain.

Rouge looked at the downed echidna with a look of irritation, but quickly softened her face into one of sympathy. She then grabbed Knuckles by the armpits and gently pulled him up back onto his feet. The echidna's eyes were still squeezed shut and his groaning turned to heavy breathing, but he stood up with shaky legs.

"Is your body in too much stress, hun?" Rouge asked with genuine concern. "Do you need a moment to collect yourself?"

Knuckles inhaled deeply and exhaled, then opened his tear-wetted eyes. "I... I-I guess not..." The echidna took in another deep breath and released his hands from his balls. "Yeah, I think I'm good now. Sorry about that..."

Rouge gave a small laugh. "It's okay, Knuckie. I'm assuming this is your first serious hit your balls had ever taken, and I made sure that kick was only just enough to not rupture them. So that was mostly your body reacting on instinct and I can understand that." Rouge placed a hand to Knuckles' shoulder with a warm smile. "Just try to resist the urge from now on. I get a lot of extra pleasure from looking at the balls after they're busted. And it's a bit hard to do that when you're cradling them and writhing on your knees."

Knuckles chuckled with an embarrassed expression. "Gotcha! I'll not deny you the sight of my busted balls again." Rouge nodded and moved back into position, swaying her rear end all the way, while Knuckles put his hands behind his head and spread his legs again. "Can't deny, though, I don't know if I'll be able to manage..." he added with a nervous grin.

The bat gave a mischievous grin in return. "Well then, here's some motivation for you; if you move just one hand from behind your head, fall to the ground, close your legs together, or do any combination of the three: I will make sure they can't move from where I want them, and kick your massive spuds hard without pause." Her grin turned to a toothy smile, one of her fangs having flashed from the sunlight. "Trust me, if you think what I'm doing right now is bad, keep in mind that I'm giving you breaks in-between kicks. And this will be the case for all future ballbusting sessions, with different rules and punishments depending on the type of busting being done." She then lifted her left leg up. "Now then, my left foot feels a bit left out at the moment, so brace yourself as I get ready to deliver that same kick with it."

With wide eyes, Knuckles clasped his hands tightly together, reinforced his stance in response, and stiffened his testes for the next kick. Of course, the echidna could do nothing to stop his balls from quivering, the agony of the kick still rippling through them, and he could not help but lurch ever so slightly forward from the ache in his belly. But nonetheless, Knux stood with vigilance and psyched up to distract himself from the pain and not fall to panic again, furrowing his brows and baring his teeth.

"Okay! Ready when you are!" He shouted with a determined voice.

Rouge was indeed ready, and at that moment she swung her left foot back and propelled it forward at a blinding speed.

'BOOM!'

The bat struck the echidna orbs at the exact center with the exact same power as the right kick. Just as last time, Knuckles was briefly lifted into the air from the sheer force, though this time his groin landed extra hard on Rouge's foot: squeezing his treasure extra hard and making the echidna feel like he received an instant double kick.

The female felt that 'crotch landing' on her foot and moaned aloud with intense pleasure, thoroughly enjoying the feeling of those nuts being pressed onto her foot by Knuckles' own weight. Knuckles, on the other hand, screamed through gritted teeth and tightened his hold on his hands as the urge to protect his junk became overwhelming.

Rouge kept her foot up for a few seconds once again to really take in the flattening of the testes before at last pulling her foot back, allowing the echidna makers to return to their normal shape. But not before dropping down with all their weight and bouncing, adding even more pain to the strained orbs. Knuckles let out numerous anguished grunts and fought with all his might to not cradle his tenders, fall to the ground, or cross his legs. Fortunately, the echidna succeeded, and stood tall looking at Rouge whilst his eyelids twitched and his legs shook.

Rouge nodded with proud grin and got onto her knees, her eyes leveled with Knux's big red potatoes, to get a good look at her work. The echid-balls shivered with agony and moved up and down from Knuckles' heavy breathing. After a moment, the scrotum began to tighten in response to the blows from that bat, to which her smile grew.

"Mmm~! There's nothing quite as good in this world than seeing the ball sack firm up from the harm." Rouge then grasped the package and moved them to see the bottom of Knux's scrota, making him squeal with a high pitch. "Oh! And I think I see a tiny bit of blue forming!"

"Urgh... Good...! You got what you want... For today..." Knuckles spoke in between breaths, and then took a deep inhale and exhale to calm his nerves. "Can you release my nuts... And go have breakfast now...?"

Rouge did as he asked, but opened her palm while the balls were held up, causing them to swing back down, to which the echidna winced with a yelp.

"Sorry hun, but we're not quite finished yet." The white-furred bat said as she turned her back and shrugged with closed eyes. "Those were only the first two kicks I wanted to do the moment we moved in."

Echidna lifted his face upward with an annoyed expression. "Uuugh... The way you kicked them already feels like over a dozen..."

Knux looked at Rouge with pleading eyes, but she wagged her pointer finger at him with a playful gaze. "Ah ah ah! Don't forget what you said to me when you agreed to this deal; I can do every little thing I want to your jewels, with as much severity and as frequently as desired. Not going back on your word now, are you?"

Knuckles recoiled his head backward with bug-eyes, remembering that those were the exact words he had told her when he decided to go along with her condition. "What?! No! I-I didn't mean-!" The claw-fisted man stopped himself and lowered his head in shame. "You're right. Sorry. Do as you will..."

The tan-skinned bat shot the echidna a look of sympathy. "Don't worry, Knuckie. This session won't last too long. And at the end, I'll give your melons a bunch of kisses to make them feel better."

Rouge puckered her lips after that last sentence. Knuckles perked his head back up in response, and his stones almost seemed to jump for joy on hearing they would be kissed by the bat's luscious lips as they motioned up.

Rouge then lifted her right foot up. "So, since I delivered two of my most powerful hits to the underside, twice, I shall do the same to the front, sides, and back of your nutsack. Gotta share the pain with all areas of the testicles. And those sorts of kicks are almost never done on the balls, so it will make for quite the sight."

Knux gulped at Rouge's next plan of attack and readied himself with squeezed eyes. Rouge lifted her right foot up to waist level and twirled her body, so the sole of her foot was aimed directly at the front of his spunk makers. The bat thrusted her foot forward at a blistering speed and smacked the very front of the babymakers, sending them swinging backwards at great velocity even slapping the echidna's buttocks with great force.

The impact of both the kick and the colliding with the butt cheeks got a yelp out of the echidna and made him involuntarily bend his knees, as the pain from the testicles got a reaction from the nerves and muscles. In fact, Knux would have kneeled down completely had he not managed to halt his knees, resulting in a slight bent stance.

Rouge kept a close eye on the balls before she delivered the kick, and was ecstatic to say the least when they hit Knux's bum and swung back down, the testicles' shapes having become more pronounced from the scrotum tightening up.

"Oh yes~! Got you spanked by your own sack! So hot...!"

As he tried to straighten his stance, slowed by the overwhelming pain, Knuckles glanced at Rouge's crotch and noticed that her underside started to glisten. And then noticed a small drop of liquid fall from her pussy, making clear to the echidna that she got wet from his 'getting spanked by his balls'. And indeed, Rouge had an expression of pure lust on her face and began to rub her clit.

"Urgh... W-Would you be willing to let me get a good look at your bat puss if you're going to do that...?" The echidna grunted a bit as he straightened his knees. "Might make this ordeal a whole lot easier for me..."

The bat pointed the bottom of her hip toward Knux and spreaded her nether lips open. "Of course! Only fair that you get to view my pussy while I'm mangling your most precious organ and delighting in the aftermath. Besides, this will only turn you on and hasten the bluing of your balls, since you won't be getting into this baby for a long time."

Rouge winked with a teasing smile, and Knuckles practically drooled at the sight of her own babymaker; the surrounding skin a darker tan to the rest of her body and the entire top of the genital covered in white-fur that was a perfect balance between thick and thin. The clitoris, in the midst of being rubbed and pressed by the bat's fingers, was red with excitement and large: larger than most others the echidna saw whenever he perused the internet. It was a known fact that Rouge was the sexiest of all his female friends, but with such a glorious snatch and breasts combined with incredible fertility... Rouge had to be a full blown sex goddess!

Just when Knuckles' rod was about to emerge from its sheath, Rouge stopped rubbing her love tunnel. "Okay, that's enough of that. Have to wait for the end of this session before I can climax." Knuckles frowned of annoyance and his eyeballs followed Rouge as she walked behind him till she was completely at his back. "Now for the kick from the back. Let's see if I can nail your dick!"

Knux braced his spunk tanks for impact as Rouge began to perform that same kick she had delivered to the front. The echidna knew that testicles were more vulnerable from the back and feared for the pain that would result from this. "GAHH!!!" he screamed as Rouge shot her foot at his backsack, the impact alone hurt almost twice as much as the previous kicks.

Just as she hoped, the bat's kick made the stones swing all the way up forward and struck at his sheath, right where the very tip of his penis was. The hidden cock very nearly poked out in response, while Knuckles struggled to remain upright with a widened stance from the agony rippling through his groin and stomach.

Rouge peered from behind the echidna and saw the aftermath of her strike from behind. "Ha! First a spank in the ass, then a slap on the dick! You're balls are the most fun any woman can ask for, Knuckie!"

Knux groaned with gritted teeth. "Argh... Good t-to know that they ent-entertain you... Even if as kickballs..."

Rouge then got a closer look at Knuckles' sheath with raised brow. "Would've been better had it actually erected, but I guess your cock is a hard one to please..." She glanced up at the pain faced male. "Funny, I was thinking you'd be constantly turned on now that we're mates, and you get to see my beautiful body exposed all the time."

The crimson man opened one of his eyes, the other squeezed shut, and forced a cocky smile. "Mph, kind of hard to get turned on when you're getting kicked in the fruit with the force of a master kickboxer. And playing risk with my dick's ability to fertilize."

The roguish bat giggled. "Oh, that may be the case as of now and for a while. But believe me when I say that, soon enough, your prick will live up to that name as it enjoys the abuse it's 'brothers' endure."

Knux mildly scoffed at Rouge's statement, refusing to think that he would ever get turned on by these attacks to his most valued organ, let alone eventually begin to enjoy it. Before he could say anything on the matter though, Rouge got back up and proceeded to kick the sides of his massive seeds; striking them hard and fast against the echidna's red thighs to the right and to the left, getting in a tight squeeze on them for as long as she could make the kicks last before having to withdraw her feet.

The echidna leaned to his left and right with the respective kicks and uttered high-pitched cries. His thighs quaked once the bat had finished, both from the impact they received from Rouge's feet via the balls and the overwhelming urge to protect the testicles via crossing, halted only by Knux keeping the bottom of his feet bolted to the ground. At that point, Knuckles broke out in heavy sweat and could feel every centimeter of his red sack and coconuts; both skin and organs throbbing from the burning sensation that came to engulf them.

"H-h-holy shit! It's starting to-!" The man interrupted himself to catch a few quick yet deep breaths. "It-it's like I just exercised my entire- *Pant* Happy sack for two hours in an intense- *Pant* Work out..." Knuckles paused his speech again to take in a massive deep breath, which managed to mostly calm his upper body nerves. "I know the feeling in my nether bag all too well from the training I did for my legs, chest, and especially my arms in the past..."

Rouge put both hands to her hips with a smile whilst twisting her ankles and flexing her foot. "Hmhm, now that you mention it, these ballbusting sessions will be like exercises for the both of us. I get to work out my arms, legs, and wings from all I'll be doing to your balls, while still getting a pleasurable kick out of them!" She emphasized the 'kick' in that sentence with a swing of her right foot in the air, which made her male partner flinch. "And all the pain I'll be delivering to your lovely spheres will not only make them bigger, but stronger and better at what they do."

The bat gave her man a wink, while Knux looked back at her with a confounded look. "But that's not how testicles work. They're not muscles that can be exercised. They're an organ that gets beneficial side-effects from normal exercising, but don't perform any better when directly worked out. Especially if those workouts amount to getting kicked with brutal force! It'll be a miracle if I'm not permanently shooting blanks after this..."

Rouge lifted her left foot underneath Knux's massive hangers, to which the echidna jumped, but this time she was caressing his aching orbs with that foot while looking into his eyes with a confident smile. "I already told you, hun. I'm not going to render your seed infertile. The way I bust stones won't damage your swimmers, but enhance them. Trust me; your already brilliant balls will function even better when I've had my way with them."

Knuckles grinned with lowered brows. "I-I'll take your word for it, then..."

The white-furred bat nodded and sat down onto the floor, stretching her legs. "Okay, now you'll want to really brace yourself for this next one. Because I'm gonna use my Screw Kick technique!"

Knux's eyes practically pop out of their sockets upon hearing those words, specifically the name of the technique. "Screw Kick?! You mean that move of yours where you practically become a living drill, with your feet as the front?!" Rouge answered with a simple nod of her head and a confirming 'Mhm!', much to Knuckles' horror. "Ar-are you kidding me?! How are you going to do that to my round treasures without reducing them to ground meat?! Let alone render me infertile!"

Rouge glanced up at Knux mid-stretch. "Don't worry; I know what I'm doing. You don't get as good at kicking as I do without having complete control over your leg power. Just as I'm sure it's the same way for you and your punches."

"S-still! Don't you think th-this is too risky...?"

Rouge changed her stretch, leaning to one side of her body and switching to the other at certain intervals, while looking at Knux. "Consider this, Knuckie: a woman's breasts are about as sensitive as your men's testicles and you had stricken my boobs on multiple occasions with your own 'drilling punch' move. Yet they are perfectly fine and very much functional."

"I mean, yeah. But those were always accidents! And I'm pretty sure those moments were never direct hits, just grazes..."

"They sure didn't feel like grazes to me... Regardless, just don't worry and be ready for the hit. You're tempting me to tell you to 'grow a pair' and we both know I shouldn't have to even think such a thing, you echidna."

Knuckles sighed with a bowed head and readied himself for the Screw Kick; adjusting his stance and attempted to firm up his scrotum to help tank the soon-to-come devastating blow.

Rouge very soon finished her leg stretches and stood up facing Knuckles, flexing her left leg by holding it up behind herself before planting it back to the ground right next to its 'partner' on the right. "Alright, I'm all set. Are you and your set ready?"

Knuckles gulped and answered with a single nod. Rouge responded with a single nod of her own, spread her legs for a good jumping stance, and jumped up high in the room. Before the echidna could get another good look at her plump bat pussy though, she immediately closed her legs together with her toes pointed downward and used her wings to spin her whole body like a tornado. The bat then aimed the bottom of her spiraling body at the male package and dove straight down...

In an instant, Knuckles' low hanging prize was stricken with incredible speed and force from what felt like a blunt drill. The spiny anteater could feel every bit of Rouge's feet, from the heels to all ten toes, as they struck his sack like a whirlwind and deform his beloved spheres. Truly, Knux was in pure agony for the duration as the pain from his testicles shot up to his stomach, his chest, and then his whole body at the very moment the attack made contact.

Naturally, the Screw Kick lasted for more than a few seconds, but Rouge also would not be able to keep it up for long without going too dizzy, and ended the technique after about ten seconds; posing with both feet and one hand to the ground and her eyes perfectly in front of her mate's round treasure. The bat expected to immediately look at the aftermath and admire what her famous Screw Kick would do to Knux's perfect pack.

But instead, she was greeted with the sight of the echidna's spike-knuckled hands grasping at his precious spunk-makers, the power of the drilling kick move having made his sense of self-preservation take over his conscious mind and swiftly moved those hands from behind the head to between the thighs.

Suffice to say, Rouge was quite annoyed. "What the-?! Hey!"

Knuckles, who had his eyes squeezed shut and quietly moaned in pain, cracked open one of those teary eyes in response to Rouge's outburst. The look of dissatisfaction on her face made the red echidna fully open both eyes in fear, and then he directed his sight to his nether region and turned white with horror as he saw the reason for the bat's irritation. "Oh shit...!" He withdrew his hands from his trembling, aching balls and placed them back behind his head as fast as Sonic could move, but the male knew it was too late.

Rouge stood up and changed her annoyed frown to a devilish grin, which further filled the echidna with dread. "Well Knuckles, I warned you about blocking your balls again. Now I have to enact your punishment~!"

Knuckles watched with pure panic as the bat turned around from him and walked over to the bedroom closet. "No! Please, don't! I-I'm sorry, hun! My instincts overcame me! I'll prevent it this time, I swear!"

Rouge opened the closet door and bent over to rummage through one of the boxes within. On account of being naked and in front of the echidna, Knux got a full view of her underside: yet again getting a great look at her love tunnel and for the first time could gaze at her perfectly curved, chocolate-colored rear end. Alas, he could not enjoy the view this time...

"Sorry Knuckie! But I can't just make up a rule and not enforce it when it gets broken." Rouge spots what she was looking for and picks it up out of the box; three thick ropes. "Besides, your instinct overpowering you to cradle those orbs gives me all the more reason to do this! Gotta make it realize that it only worsens things for the testicles in trying to protect them."

Rouge turns back to Knuckles and holds out the ropes in both her fists. Knuckles recoils from the sudden unveiling of the ropes and slumps his head over with a downcast look. "Alright... Let's get this over with then..."

Rouge nodded with a gleeful grin and flexed the ropes as she approached Knuckles. Without wasting any seconds, the bat tied two of the ropes to each of his ankles and tied one around both wrists, binding his hands together. The tan-skinned hottie then tied the 'wrist rope' to a hook in the ceiling and the 'ankle ropes' to two hooks screwed into the floor, said hooks having been installed by Rouge during the moving process.

And so, Knuckles found himself bound by rope, his hands and arms forcibly held up high to the ceiling while his feet and legs spread just far enough to be comfortable but still leaving his overwhelming seeds exposed. With the ropes tied tightly, there was no way Knuckles could block the bat's view of his freshly battered balls anymore, be it with his hands, legs, or curling his body.

After ensuring the ropes were secured and all was to her liking, Rouge clapped her hands together in excitement. "Okay! Before I get started, the ropes aren't too tight around your wrists and ankles, right? Don't want to cause chaffing, or block out blood flow."

Knuckles twisted his wrists and ankles, among other movements, to determine how the ropes feel to those joints. "Hm... Nah, I think I'm good. This isn't the first time I've been bound by wrist and ankle."

Rouge put a hand to her mouth and laughed a bit. "Now I'm curious to hear about that first time. And any other times!" The bat then began to crack the joints in her feet, starting with the toes. "But alright! If those ropes aren't and won't be hurting you..."

The dark-toned bat jumped into the air and once again performed her Screw Kick, pounding the echidna's meatballs with a swirl of kicks, but this time doing it for much longer. Knux grunted aloud as his virile gems were stricken backwards only to swing back to the tornado of feet, repeating the process for many seconds, and soon enough he screamed from the immense pain being applied to his meatballs.

Eventually, Rouge's almighty Screw Kick came to an end as she felt a tinge of dizziness. But upon ending the spinning attack, Rouge instantly delivered a powerful front kick to the echidna makers with her right foot, then immediately followed it up with a kick from underneath them with her left. Just as Rouge had promised, she attacked those balls with a flurry of all sorts of kicks that could be aimed at those low hangers, including roundhouse and a leaping kick. Doing all of those kicks without so much a second-long gap in between each one, not allowing the echidna even a millisecond of a break from the testicular torment.

Knuckles endured the hits about as well as one would expect a man of his testicle size to. He tried to resist the pain being delivered and keep his eyes open. But no amount of will power could reduce the agony nor take his mind off it, and the most he could do to keep his eyes open was to squint. And soon enough, the harm his balls sustained got to the point where his whole body began to flinch and twitch with each hit down there. And needless to say, Knux writhed and thrashed his head and torso back and forth the whole time, the ropes preventing his arms and legs from doing the same. The echidna let loose all sorts of screams, grunts, groans, squeals, and squawks for the whole duration, which got higher and higher in pitch as the bat's kicks raged on.

When a full half hour had passed, Rouge stopped her punishment kicks at last. Both the bat and the echidna panted heavily, Rouge from the exhaustion of doing all those kicks, and Knuckles from all the kicks Rouge delivered, all the while steam rose from her feet and his nuts. Upon noticing Rouge had ended his punishment, Knux bent his knees to rest his very tired legs, but on account of his hands being tied up to the ceiling had to make do with hanging by the wrists.

"Pant... Whew...! Pant... I'd say... That's the end... Pant... Of that session..." Rouge lifted up her feet one at a time and shook them to relieve the burn they gained from that 'workout', and then sat down to massage her feet.

"Pant... Thank... Pant... Goodness... Pant... You gonna... Pant... Let me down now...?"

Rouge released a relieving sigh. "In a minute... First, I want to get what I was denied."

Rouge skidded herself over to the hung up echidna whilst sitting, dragging her thick butt across the ground, and moved her head close-up to his cum factories. Immediately afterward, the bat shuddered with pure euphoria as the big red balls had become a serious sight to behold; the scrotum had significantly tightened up from the burning and stinging pain it had endured, allowing the full round shape of the fruit to be seen. The spherical organs also pulsed like no tomorrow, as well as moved up and down with each deep inhale and exhale Knuckles made, making the sight even more of a delight for the dark-toned bat.

"Oh~! Oh my god...!" The bat placed her left-hand fingers to her clit and rubbed with fervor. "Just the first day, in the first session that lasted about an hour, and I damaged your balls into the perfect state~!" Rouge then placed her right palm underneath the quaking sperm tanks to cup them, getting the most direct touch of the testes and feeling their movements. That, of courses, prompted the echidna to yelp from her touch at his vulnerable organs in their most sensitive state. "Mm~! They're so tender!" She looked up to Knux's face. "Okay, I'll release you now. And right after, I'll give your balls the loving I promised."

A heavily sweating Knuckles gave the bat a big cheeky smile as she undid the rope around his ankles, and then got up and moved her hands up to the rope that bound his wrists. Due to the rope being quite a reach, Rouge had to get on her toes to grab at the wrist rope and indirectly smothered Knux right between her massive breasts. Not that the echidna minded at all.

Once the rope was undone, Rouge caught Knux as he fell onto her, his legs still too exhausted to stand. Fortunately, the echidna was not too heavy, given his capability to glide with his dreads, and the bat had plenty of upper arm strength. And so the dark-skinned, white-furred woman carried the red-furred man to the bed and placed him on to it, upon which he laid down on his back with his pelvis on the very end of the bed, his legs and balls hanging over.

"Mph! Thanks for that, bat girl..." Knuckles 'phew'd' with relief.

"No problem, echidna." Rouge got onto her knees and set her eyes on the vibrating goods. "Now for those kisses to heal your balls booboos."

Rouge clutched Knux's throbbing jewels and wrapped her lips around the sack. She then sucked and licked the scrotum and each nut, having to suck and lick one at a time due her mouth not being large enough to fit both in. The feeling of the tensed up scrota with the aching fruit in her mouth overwhelmed the bat with euphoria and she moved a hand to rub her clit.

Knuckles groaned loud when the bat began her ball job, his visibly pained testicles obviously not welcoming the pressure her suction put on them. But soon his groan lowered in volume and changed into a lengthy moan as Rouge's lips, mouth, and tongue put out the proverbial fire that was burning his loins. The agony persisted in them, of course, but the pleasure the bat was delivering became equal to the pain they sustained and he could at least find enjoyment in that.

Rouge soon inserted the fingers of her other hand deep into her pussy and fingered herself with great fervor, and sped up the rubbing of her clit and her french kissing of her man's bountiful pack. Knuckles grasped at the bed's sheets in response and his moans filled the room as the pleasure and pain reached intense levels for him. Though, to his shock, the pain was complementing the pleasure in a way that made for the best feeling he ever experienced.

After many minutes of feasting on the echidna's succulent eggs, Rouge's climax became imminent, while Knux's merely approached. The echidna's cock began to bloom out of its sheath, the very tip at last being exposed, while the bat's crotch lips closed tight on instinct and she removed her mouth from Knux's round goods, her tongue hung out in a lustful fashion. "Ah~! Oh Knuckie... I'm going to cum...!"

The two breathed heavily as their respective genitals underwent contractions and spasmed, with Knuckles' sack becoming even tighter and the stones trembling even more, all while his rod steadily rose. "Urg...! I'm just about halfway to mine...!

"Good...! So then you won't cum when my other lips kiss your goods!"

Rouge removed her fingers from within her vulva and stood up from on her knees. She then aimed the bottom of her crotch over the red man's immense seed bag and rubbed her clit with both fingers and palm in a further. "Aaaaahhhh~...! Aaaahhhhhhhh~!"

Knux lifted his head up to see what Rouge was doing, wondering why she halted her 'kissing' of his valued nuts. "Wait, what are you-?!"

At that instant, Rouge let loose an intense orgasm: her lady juices pouring out of her love tunnel in a deluge all over the echidna's cum tanks, drenching both organs and the skin that surrounded them with the bat's fluids.

Rouge screeched the entire duration of her orgasm, the scream loud in volume yet pleasing to the ears. Knuckles shouted a surprised 'Whoa!' at the moment of her orgasm, then moaned with soft giggles from the liquids squirting out of Rouge's chocolate pussy onto his aching balls.

Upon finishing her wet explosion, Rouge sighed with satisfaction and pleasure, and shook her hips up and down to shake off the drips onto Knux's red hanging orbs.

Knuckles lifted his head and torso upright, and laughed with a huge amused smile. "Holy crap! You, my bat girl, are truly bat shit crazy!"

Rouge shrugged with faux innocence. "What can I say? Men love to jizz on a woman's boobs, I like to jizz on a man's balls."

The spiny anteater snapped his fingers and pointed both pointer fingers to Rouge. "Touché! So, is this session officially done?"

The bat raised her pointer finger. "Not quite!" She turned herself around and sat next to Knuckles on the bed. "I'm finished busting your balls, but now it's time to deny them so they turn blue." She glanced down at his groin and her smirk became more pronounced. "Huh, how convenient. Your cock finally decided to show itself."

Knux looked down and saw that his dick was indeed fully erect; the stubborn thing having shot up into a stiff and thick tower the moment Rouge's lady cum soaked his nuts. The echidna and bat had not noticed the rod exposing itself as they were too engrossed in the activity that provoked the echidna member.

Rouge lowered her brows in slight disappointment, having wanted to see the recluse cock's grand entrance only to miss it. But the disappointment lasted for only a brief moment as she raised both brows with interest at the sight of Knuckles' genital.

The penis was peach-colored, six inches in length and highly thick; just barely enough width to fit in Rouge's snatch, as she estimated. That in itself already proved the seed spreader to be very promising for the lustful bat. But what really stood out to the bat was the head of Knux's manhood. Or rather, the four heads of his manhood! Each head manifested as reddish bulbs with holes, and they stood side by side of each other like the prongs of a trident. Indeed, one would not help but form a mental image of a four-fingered hand from an echidna's penis.

"My my, that's truly exotic equipment you got there, hunkie! No wonder it was so reluctant to show itself." Rouge giggled in a teasing tone.

Knux scratched the back of his head with reddened cheeks, glancing his eyes to his side. "Yeah... I actually think that I've unconsciously resisted getting erections because of how... 'Unique' my dick is..."

The bat placed a tan hand to the four-headed unit and lightly grabbed the shaft, her eyes fixated on the four-headed snake. "Aw, hun, you shouldn't feel like you have to hide this! Yours is the most beautiful dick I've ever seen!"

Knux looked back at Rouge, still scratching and blushing, but had a soft smile. "Heh, you sure the four heads are more of a turn-on than a turn-off?"

"Of course!" Rouge brought her other hand to the dick and tightened her grip in both hands with an eager expression. "Oh, I want this four-headed beast inside my bat cave right now~!" She moved both hands up and down the peach pillar, to which it stiffened even harder, and the bat sighed with a hint of desire. "But we can't risk having any vaginal sex until I get your balls blue'd to perfection."

Knuckles leaned his head back and closed his eyes in contentment to his four-headed pride being stimulated. "Mm... At least the denial of sex is mutual..."

"Yeah, but I can at least cum whenever I want. You won't be getting to cum until your balls are blue. And even after, I can only allow you to cum inside my vagina so we can keep your balls full when I bust them." Rouge increased the speed of her rubbing and her hands collided with the bottom of the four cock prongs, which made them turn to a deeper color of red.

"Oooh~... Fine by me. I can't even cum outside of a vagina anyway..."

Rouge bolted her eyes open and halted her handjob. "WHAT?!" She resumed the dick rubbing and looked up to Knux's face. "Seriously?!"

The echidna looked back at the bat with widened eyes, caught off guard by her shock. "Y-yeah...! I've masturbated over a dozen times and never shot out even a drip of cum I reach my climax. And Tikal confirmed to me that echidna men can only release their seed when mating for children..."

Rouge held a look of disbelief for a moment before forming a massive smile with mischievous eyes. "Oh wow! Even more reason to save you guys from extinction! I will not let a species this sexually unique to be gone forever!" Rouge moved her right hand to the very tip of Knuckles' member and grabbed hold of all four of its heads, her left hand still rubbing the rest of the unit, and rubbed with both hands as fast as she could manage. "I had a punishment in mind for if you came before I allowed it, but you won't have to worry about that anymore!"

Knuckles' legs tensed and he arched his body forward from the intense and rapid pace the white-haired bat massaged his thick rod. He made a swirled smile to one of his cheeks and practically drooled with pleasure, moaning and grunting all the while. "Ooohhh~! Aaahhh~...! What would you have done if I could cum outside your pussy...? Would it have involved hurting my dick?"

Rouge shook her head. "Not at all! I don't find any pleasure from busting cocks, only the balls. After all, the family jewels and scrotums can take beatings! The penis, on the other hand, is too sensitive and easily broken." Rouge glanced her green eyes down at the testicles once again. "I would've just put a device on your nuts to prevent cumming until the breeding time, while adding to the pain from the busting sessions."

"Ah! Gotcha! ...Oooh~..." Knuckles leaned his head back again in pleasured relaxation, his thoughts drifting about in his head. "You know... I've been meaning to ask since we started this deal... Why are you so fascinated with balls...? It's like testicles are just as much of an interest for you as gems and jewels..."

The bat looked up to lock eyes with Knux again, this time with perked up ears and an interested look, and her stroking of his cock slowed a little. "Well, I guess in my case, I just admire the testicles because of how they're unique to you men, alongside the penis. But the testicles are even more important since they produce your sperm and testosterone. Them being round, bouncy, and 'responsive' just adds to the appeal. They're practically the boobs to you men, but with a purpose that actually involves sex!"

"Mm... When you put it like that, yeah, the balls are kinda hot... But then... Why the ball busting? How can you sincerely love nuts but also enjoy harming them...?"

The bat shifted her eyes back to focus on the echidna's dick and slowed her handjob even more. Knuckles became confused by this increased slowness in dick rubbing and sat himself up to look at Rouge. "As confusing as this will sound... As much as I love the testicles and everything about them, I also resent them a good deal."

Rouge slowed her stroking even more, but the handjob became much more sensual; moving her soft fingers to massage every single area of Knux's cock.

"We all know that not everything is equal in this world, Knuxie. And as much as I'd hate to admit it, in regards to sexual parts, you men win out over us women. As proud as I am of my pussy and uterus, they are quite a burden. Not only do we have to deal with pregnancy, which isn't a comfortable state for a number of reasons. But once that is done, we have to endure the absolute agony that is labor that can last for a long time. And after that, we have to push out an entire baby, or more, through our pussy! No woman is spared having their vagina ruined from giving birth, not unless they have their belly cut open instead. And many have died from the blood loss."

Rouge began pressing her palm into Knux's cock and occasionally inserting her fingers into his urethral openings. Knuckles let out an astonished 'Oh~!' and started grunting and moaning again, but tried to restrain them in order to pay attention to the bat woman. "And if that wasn't enough, even when we aren't pregnant, we have to suffer from cramps and vaginal bleeding for a week every month!"

Knuckles curved his brows in sympathy, trying not to smile from the handjob. "Mph! I'm so sorry you women have to deal with all that shit. It's seriously unfair...

"Exactly! And there's nothing we can do about it to make things better! Meanwhile, you men can never go through any of that crap! Your balls don't give you horrible cramps every month for a week, and your part in baby making is as simple as having sex, one of the most pleasurable things in the world, and that's it! While women get swollen bellies, morning nausea, and all other unpleasant crap for nine whole months, ending with absolute agony... Men remain physically unchanged, aren't inconvenienced in any other way, and don't go through any pain."

The tan bat looked down to Knux's balls, which were visibly stimulated by the intense handjob as they moved about up and down, while still thoroughly pained as they pulsed heavily. Rouge smiled a bit at that sight. "And so, a big part of me can't help but want to torment the testicles and watch them throb in suffering, since they are mainly responsible for causing pregnancy and birth within us women. You men and your dicks wouldn't do nearly as much 'damage' to us women if it weren't for your balls producing the seeds that fertilize our eggs. And abusing them is the closest equivalent you men can have to experience the discomfort of periods."

"Unf... So your ballbusting kink is your way of making things 'equal' between men and women, biologically speaking...? Well, I personally can't object to that after what you told me."

"Mhm! Although, another big reason for why I get great enjoyment from attacking the balls, and seeing them be attacked and in pain, is because of how vulnerable they are despite their value. While not vital like the heart, lungs, or brain, the testicles are undoubtedly the most important organ to you men; not only creating the sperm needed to reproduce and contribute to the gene pool, but the testosterone that gives you men your strength. The testicles define you men just as much as the penis, if not more! And yet this valuable organ, the sole thing that determines whether your genes live on or not, hangs below the waist and between the legs. Instead of residing within the safety of the body like all other organs, the testes expose themselves to the outside world and all its dangers. The only thing providing them any protection being a sack made of skin, no more durable than the rest of the body..."

"Ah~...! I can see what you're saying, hehe. You want our nuts to experience constant pain as punishment for their chosen location." Rouge nodded to confirm Knuckles' words. "Well, I guess that makes sense."

"Glad you think so! But let me reiterate that I very much love balls. I don't hate testicles or find them useless. I just want you men to share the pains we women get, and make your balls endure the dangers they expose themselves to. This, if you think about it, would be doing them a favor as those nuts will adapt to the hurting and get tougher from all the abuse I give them. Maybe even become even more productive in response to compensate for the beatings they take."

"I'm not sure if that last part makes sense. But my balls becoming more productive would make the bustings even more worth it, heh! Overall, though, I can totally get where you're coming from! Like, I love boobs because they're so bouncy and jiggly, and of course their natural purpose is a huge turn on. Yet for some reason I also want to punch them. I guess cause they look so punchable...?"

"Hmhm, I can accept that reasoning. In fact, I don't think I would object to you punching my breasts now." Rouge lets out a laugh. "How about this? After our first set of 'kid-nas' are born, I'll decide whether or not you can bust my boobs. For all I know, pregnancy and birth could be a complete hell for me. So me being able to bust your balls to the limit would still be a fair compromise, while letting you attack my baby feeders in return would lean things in your favor."

"That's-! Oooh~! That sounds- Hoohoohoo~! Sounds good to me~!!!" At that moment, Knux noticed that his dick and legs were vibrating and twitching. And the man could hardly keep his hips still as the urge to pump them back and forth arose.

"I take it you're about to climax?" Knuckles nodded in a rapid motion, his face strained from holding back his sexual pressure and he moaned at max volume. "Heh, took you long enough! I've been rubbing your dick for, what, ten minutes? Well, time to get your balls blue'd!"

The bat focused all her energy into her hands and fingers and massaged Knuckles' four headed wonder at absolute speed again. Though she continued with the intense techniques she had been doing, namely the insertion of her fingers in the echidna's penis holes.

Knuckles' entire prick reddened as blood flowed into it, with the heads becoming as red as his fur. The crimson echidna could practically feel the contents of his huevos churn, his seed eager to escape the freshly abused homes and fulfill their duty. With those feelings, combined with the speed and way Rouge stroked his pillar of love, Knuckles could no longer resist the climax.

The echidna threw his head back and roared with might as he released his sexual excitement. His cock and balls shook with vigor as they attempted to unleash their sperm. But no matter how intensely the penis pumped or how much the testes contracted, nothing erupted from his four tunnels: not even pre-cum. Knux's mighty roar quickly turned to a desperate howl as the ejaculation pressure in his balls was not being used despite the buildup, due to the penis refusing to eject the baby batter outside a vagina, and so the pressure takes it out on the poor man's already 'taken out on' orbs.

Given that the climax took a good while to build up, it is not much of a surprise that the dry orgasm went on for a good while as well. Knuckles continued to fill the room with his long, pained cry as the agitation in his seed makers got worse and worse over the duration. Rouge, in the meantime, kept massaging that dick to keep the empty discharge and watched those red coconuts jiggle in irritation from her provoking them to cum when they were unable to.

After about five minutes, the cumless orgasm ceased at last. The ruby spiny anteater panted with exhaustion and fell backwards onto the bed, then blankly stared at the ceiling, unsure of how to process the incredible soreness that had consumed his crotch. Even his penis began to ache alongside the balls, as it started to register the minor friction burns Rouge left from her fast and hard stroking.

Rouge, on the other hand, though tired from all the energy she spent kicking those balls and rubbing that cock, could not be more ecstatic; she bit the bottom of her lip and formed a big toothy smile with both fists raised and shook. The bat watched with glee as the echidna's thoroughly reddened member pulsed and turned from erect to flaccid, lying itself flat and straight against Knux's belly and slowly returned to the safety of its sheathe. And his stones were truly a sight to behold; they twitched, convulsed, and throbbed with great force. All the while the scrotum held them right up against the very bottom of Knuckles' pelvis, the pouch having tightened significantly from the busting and the denied release.

The sight of the echidna makers in that state would be enough for Rouge, but there was one more thing she had to check. And so, the bat grabbed the chord of Knuckles' red mangoes, which prompted him to grunt, and moved them upward to get a look at the underside of his nuts. Sure enough, she saw what she wanted to see.

"Mm yes~! Just one session of denial and already the bottom of your balls have changed color, hun!" Indeed, two small but notable patches of dark pigments manifested at the very bottom of Knux's nuts with only a gap of red in between.

"Urgh... That's good, I guess..."

Rouge squinted her eyes and drew her face in closer to the testicles. "Okay, let's see what color they actually turned to..." The bat studied the underside of that scrota, struggling a bit due to the red fur on Knuckles' nuts interfering with her judgement. After half a minute though, she figured it out. "Huh... Looks like your balls indeed turn purple when denied!"

"For reals?"

Rouge dug her fingers into the scrotum to peer through the echidna's red fur, earning quite the groan from the man. "Lessee here... Oh~! It appears that your balls actually turned blue, as the color on the skin itself is blue. But with your red fur in the way, it appears purple! So, once we get your balls fully changed, they'll both be massive blue melons and massive eggplants!"

"Heh, so you get the best of both worlds! Well, depending on whether I shave my nuts or not."

"Hmhm, indeed! And you won't have to worry about deciding to shave, for I'll do it for you when I feel it~!"

Knuckles grimaced at the thought of that bat shaving his balls. He then sat himself up and looked down at her as she still studied the purple bits. "So, how long do you think it will take for my balls to become completely purple, blue, or whatever?"

"Hm... Considering this is the amount from one denial session, and it's pretty small... I'd say around two months. And that's even if I 'blue ball' you multiple times each day."

Knux slapped a palm to the top of his head from the side. "Two months?! Agh, I don't want to wait that long for us to breed the first echidnas..."

Rouge released the echidna's balls, which caused them to swing into the side of the bed and make him grunt, and then she placed both her hands to his face with sympathetic eyes. "I know, Knuckie, and I'm sorry. But two months isn't that long! If we keep ourselves busy, time will fly and your balls will be blue'd and purple'd just like that!" She then moved her hands from his face and stepped backward from the echidna. "In the meantime, just keep thinking about when that day comes..." The bat leaned back, swaying her hips, and opened up her vulva toward Knux. "When you and your most wonderful cock get to enter my tight and juicy bat pussy, and fill me up with all that blue seed from your aching balls..."

Rouge turned around, winked at her mate, and slapped her butt, then walked out of the room. "Now, with all that done, let's have our breakfast. I'll do the cooking; you can just sit and relax after all that."

Knuckles took a moment to cradle his balls and winced as he did so. While for Rouge those two months will go by quickly, he knew that it was going to be long, painful, and horny time and he dreaded what that bat was going to do after breakfast. But then, a grin curved on the side of his mouth as the red echidna decided to take those two months of busting and denial as a challenge; a test of endurance for his testicles and mental fortitude, with the reward being what would no doubt be the best sex anyone could ever achieve that will also get him off the extinction list. Knux hopped off the bed and exited the bedroom to join with his mate in the kitchen.