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Knuckles the Echidna was many things; Guardian of the Master Emerald, treasure hunter, a hero of the world, a leader, a devoted friend, the Red Rad... And a gullible fool.

More tragically, however, Knuckles was also the very last of his species.

Once a prominent race whose structures litter the world, the echidnas were suddenly reduced to an endangered species when one of their groups, the Knuckles Clan, whom Knuckles himself is named for, invoked the wrath of Chaos with their hubris and the deity went on to wipe out almost every Knuckles Clan echidna and decimated the rest of the species in blind rage.

By the time Chaos' rampage was halted, the surviving echidnas were left at the mercy of their enemies, while others found themselves separated from the rest of the world as the sealing of Chaos caused the land to rise to the sky into what is now known as 'Angel Island'. The entire echidna species could never recover from this devastating event and their numbers dwindled over the next thousands of years, ultimately leaving Knuckles as the only one remaining alive.

Upon learning of being an endling, Knuckles didn't think much of it. After being alone for much of his life, Knuckles already figured he was the only living member of his people and so the revelation didn't impact him much. But as Knuckles grew older, the existential dread of being the last of his kind increasingly dawned on him. Once the last echidna reached the age of twenty, his status was all he could think about.

As he stood in front of the Master Emerald, as per his self-imposed duty as its guardian, Knuckles bowed his head with closed eyes and a frown as his focus was entirely within his mind. Knuckles was deep in thought for most of the day when, all of a sudden, a voice called from behind him. "Hey!"

Knuckles flinched and rotated his body with swiftness in a defensive stance, only to find the source of the voice was Tikal, an echidna girl who lived in the ancient times and was both the daughter of the Knuckles Clan chief, Pachacamac, and the one who sealed Chaos, which caused her to live on as a spirit tied to the Master Emerald.

Knuckles stared at the ethereal tribal princess with blank eyes, Tikal looking back at him with a playful smile, and then seconds later lowered his fists with furrowed brows and narrowed eyes, prompting the orange-hued spirit to giggle.

"Dammit Tikal! I told you not to surprise me like that!" Knuckles chastised. "You could've given me a heart attack!"

"Oh Knuckles." Tikal snickered. "I was only trying to greet you. And you're much too young and healthy to suffer a heart attack."

"Yeah, well... Next time speak to me from the front and with a quieter voice... Any loud sound from behind makes me think someone's trying to kill me from the back."

"My goodness, guardian of the Master Emerald, what has gotten into you as of late? Every time I see you by yourself, you're always in an engrossed state. And you're much more careful about your mortality than years past."

"You know why! I'm the last echidna, Tikal! The moment I die, the echidnas are gone from this world forever!"

Knuckles turned his back to Tikal and sat on the top stair step of the Master Emerald altar, hanging his head down. "I don't think any other sapient species has ever gone extinct. We echidnas will be the first if I die, and the only things that will keep us alive in the memories of present and future generations are our constructions, which will fade away soon enough."

Tikal looked at Knuckles with sympathetic eyes and then grasped at her chin, pondering about the lasting legacy of the echidna race. Knuckles sighed and continued on. "As the only living member of our kind left, the continued existence of the echidnas depends on me. I can practically hear the spirits of our people begging me to save us from extinction! I have to do something...!"

"Well... Why don't you breed with a fertile female?" Tikal asked. "If you feel your place as the Master Emerald's guardian is keeping you from that, Chaos is more than willing to re-take his role in guarding it. Or if the woman is willing to live with you, that house Tails built recently should be a suitable living space for her."

"That's not going to work in the long run though. Without any other pure echidnas, all my children will be half-echidnas, and their descendants will be less and less echidna as the genes of other species take over. I'd only be delaying the inevitable and passing my existential dread onto my descendants."

Tikal moved to Knuckles' front with a reassuring smile. "Oh, you needn't worry about that, Knuckles. I happen to know a method to ensure your descendants will be pure echidna and keep our kind truly alive."

Knuckles lifted his head up with bug-eyes. "What?! Really?!"

"Yep! You'd be surprised by what my mystical powers can accomplish. Just come to the Master Emerald when you and your chosen partner are ready to breed and I'll explain more then. I'm sorry I didn't tell you sooner, I didn't know it was a concern of yours."

Knuckles stood upright with a big grin and gave Tikal a thumbs up "Hey, no worries, Tikal! I've only just recently became an adult, so this news came at the perfect time. If you weren't intangible, I would hug you right now!" Tikal formed a gentle smile to that comment while Knuckles placed his hand to his chin to think. "Hm... But who can I have as my breeding partner...?"

Tikal looked on at Knuckles as the red male considered his options.

"Amy managed to get in an actual relationship with Sonic, and otherwise would only want babies with him, so she won't do..."

"Blaze lives in a separate dimension and has far too many things of her own to worry about, so she won't be able to help us out..."

"Wave is a total bitch and would refuse, even if she relates to my problem..."

"Vanilla would've been perfect since she's already a mother and her species is absurdly fertile. But that bastard Vector already took her!"

"And I don't know any other women I could ask..."

Knuckles turned to face Tikal again. "You sure there's no way to revive you back into a physical, breathing person?"

Tikal shook her head. "I'm afraid not. Chaos and I have searched countless times for many years. Given that the Master Emerald itself is responsible for my state, I've come to accept that I'll never be flesh and blood again..." Tikal looked down with downcast eyes, looking at her incorporeal form, but then lifted her head up high to think. "What about that bat woman who tends to visit here?"

Knuckles looked at Tikal with off-guard eyes. "Rouge?!" Knuckles looked around in all directions, rubbing the back of his head while looking away from Tikal the whole time. "I... Well... Um... I... Er..."

"I know your feelings on Rouge are rather... Mixed. And you two have a complicated relationship. But if repopulating our species is that important to you, then all valid options must be explored." Tikal moved up to Knuckles. "You should at least consider the one viable person you have a history with before deciding to form relationships with women you never met before."

Knuckles crossed his arms and deliberated on her suggestion for a minute or two, closing his eyes with a downward head in deep thought.

"Well, we have patched things up and become sincerely good friends recently... And I think she has always loved me more than dislike, despite our occasional fights... I also know for certain that Shadow won't be an obstacle, those two strictly being friends... But given the type of person Rouge is, I doubt she'll even want to help us since it would mean getting pregnant over a dozen times... Though she is a bit of a wild card, so she might just accept on a whim..." Knuckles un-crossed his arms. "I guess it wouldn't hurt to try and ask. Gotta approach this the right way though... One wrong move and she may never wish to speak to me again."

Tikal placed her hand to his shoulder. "You'll do great, Knuckles! You're far better with the ladies than you think you do. Trust me, I'm one of them." Tikal and Knuckles giggled. "Good luck with your meeting with Rouge! I'll be here, waiting for when you return with her. Or someone else."

Knuckles nodded to Tikal and ran off from the Master Emerald altar.

~~~

Later that day, Knuckles made his way through Night Babylon, right as the day turned to night.

A district of Central City, Night Babylon was named for its bustling nightlife, being full of bars, casinos, and theaters, each building being covered in colorful neon lights. Unsurprisingly, Night Babylon was Rouge's place of residence, the bat residing in the local hotel and even owned a casino right next to the place.

Knuckles walked through the streets at a steady pace, shifting his head left and right with a watchful eye and keeping a small, square box close to his chest. Still unfamiliar with urban environments and wary of others, Knuckles was very much on-guard and made sure trouble didn't come his way; a smart thing to do, as Night Babylon was home to crime that prey on lone visitors.

Soon enough, the echidna arrived to Night Babylon's hotel and made it to Rouge's penthouse, managing to get by the front desk due to being on her guest list. Normally that wasn't the case for Knuckles, since he only ever left Angel Island for special occasions and Rouge knew this, but Knuckles made sure to call Rouge beforehand with his Miles Electric and tell her of his visit, knowing the hotel's front desk and security would be an obstacle otherwise.

Standing in front of Rouge's penthouse door, Knuckles was sweating and breathing as if he ran a marathon on a hot day and stood stiff, his muzzle as red as the rest of his body from blushing.

"I can't believe I'm doing this!" he thought to himself. "Coming up to Rouge in her own home and pretty much asking if she'd be a breeding sow for echidnas... I mean, obviously that's not the case at all and I'll never treat her like that! But that's how she'll see it..." Knuckles gulped. "We've only recently become actual friends with each other... This could easily undo that..."

Knuckles took a deep breath and exhaled, trying to calm his nerves. "Well, she knows I'm visiting, so it's now or never..."

Knuckles raised his right fist and knocked twice on the door. A few seconds passed when the door is opened, Rouge on the other side of the frame, wearing cotton pajamas: a black short-sleeved button shirt, with the top few buttons inconspicuously undone to allow a good view of the bat's cleavage, and pink pants with green diamond patterns.

"Hey there, Knuckie." Rouge greeted with a sly yet welcoming smile. "So, you actually came over to my place. I'm a bit surprised, even with that call of yours."

Knuckles blushed a bit, rubbing the back of his head. "Yeah, well, I'm not one to say I'll do something and not actually do it, you know?"

A moment of pause occurred between the two when Knuckles cleared his throat. "I, uh, I got you a gift!" Knuckles held out the box he had been carrying, offering to Rouge. She wordlessly accepted it. "It's, um, something I felt like doing, in case you're wondering." In truth, Knuckles got Rouge this gift in the hopes it would reduce any negativity from Rouge if she rejected his request.

"Hmhm, not like you to do things just because." Rouge chimed as she opened the box, revealing the gift to be a set of natural gems, growing out of stone and unpolished. "Oh my! Did you collect these from that island of yours?"

"Y-yep! Do you like them?" Knuckles cracked a small smile.

"Why, of course I do! They may not be conventionally nice to look at, but gems in their natural state are just as beautiful as their crafted forms. Thanks, you red echidna." Rouge gave Knuckles a wink.

"Heh, no problem, batgirl." Knuckles winked back. "So, may I come in?"

Rouge stepped aside from the door. "Make yourself at home!"

Knuckles nodded and walked into Rouge's penthouse. The bat closed her door and followed the crimson echidna once he passed her.

The two walked over to the living room, which it and the rest of the penthouse was decorated with all sorts of gems and jewels everywhere; on the coffee table, walls, ceiling, and even part of her furniture and lights. Even knowing Rouge's obsession for jewels, Knuckles could only look around her place in amazement at the collection she had amassed and how she put them to use.

Upon entering the living room, Rouge gestured to her couch. "Feel free to have a seat."

Knuckles obliged and sat on the couch, doing so in a slow and rigid way to avoid messing it up by accident.

Afterward, Rouge hopped onto her lounge chair, setting Knuckles' gift onto the coffee table as she looked at him. "Okay, what do you want with me?"

Knuckles grinned with nervousness, having not expected that question. "Wh-what do you mean?"

"Come on, Knuckie, we all know that you only ever leave Angel Island when something involving you is going on, whether that be the Master Emerald being endangered or the entire world being at stake." Rouge leaned to her side, resting her head on her fist. "You've never willingly hung out with friends before, except for holidays and birthdays, yet here you are paying me a visit in an average day and with a gift no less."

Knuckles rubbed his left arm in a slow pace. "Heheh, that is pretty suspicious, I admit..." Knuckles chuckled with a hushed tone and started thinking of excuses to give Rouge, but struggled to come up with anything that could work with the clever bat woman and ultimately decided to just tell her the truth. "Okay, you got me. I do need you for something..."

Rouge's ears perked up. "I'm listening." She said with eagerness.

Knuckles started rubbing his arm faster and began to heavily sweat and blush again. Knux had hoped that he and Rouge would have a friendly, lengthy conversation first before he inquired her, but now he was forced to explain his situation right then and there to her. "Alright, how do I put this...?"

Knuckles struggled to come up with the right way to ask Rouge to breed the echidnas back from extinction with him, but the nature of the question made it way too difficult for him to put in a way that could appeal to the tan bat.

After wasting too many seconds trying to think, fearing Rouge would get impatient, Knuckles slapped himself and asked the immediate words in his head. "WILL YOU MAKE BABIES WITH ME?!"

Knuckles' muzzle turned pale and his irises shrunk, having realized the volume and manner he asked that crucial question. Rouge's expression was exactly what one would expect from such a question in such a fashion: her eyes wide open, a brow raised above the other, and a confused frown. An awkward silence between the two started, Knuckles and Rouge's sight locked together the entire duration.

After a full minute passed, Rouge ended the silence with a burst of laughter, her eyes squeezed shut, tears leaking out of the corners and a hand over her mouth. "Hahahahaha! That's one heck of a way to ask a question, especially one like that, Knucklehead!"

Knuckles pointed his face down, hiding his eyes from Rouge's view. "I... I'm sorry... That came out really wrong... I shouldn't have come here to begin with..." Knuckles got up from the couch. "I'll go ahead and leave you alone...!"

Knuckles was about to rush out the door when Rouge called out to him. "No, no, it's okay, you big goof! Sit back on the couch and relax, hun."

Knuckles looked back at Rouge, giving her a perplexed yet relieved look. "You're... Not mad?"

"Not at all!" Rouge assured, as Knuckles got back onto the couch, this time in a more relaxed manner. "I'm more curious than anything, and pretty amused." Knuckles breathed a quiet sigh of relief as Rouge went on. "Let me guess: this is about you being the last living echidna, isn't it?"

"Your guess is absolutely correct..." Knuckles looked down at his navel with contemplative eyes. "I'm the only hope for the echidnas and I've decided to do something about it, lest we be doomed to be the first of sapient's to go extinct. But, of course, that means I need a woman to repopulate with and..." Knuckles lifted his head up and rubbed the back of it as he blushed. "Uh... You're the best one I can go to for this..."

Rouge placed an elbow on the arm of her chair and rested her head on her hand. "Is it because of my big breasts and 'appealing' body?" she teased, following it up with a soft giggle.

Knuckles grinned with a blush. "Not... Necessarily. Er, I mean-!" Knuckles shook his head to recollect his thoughts, to which Rouge snickered a bit. "Yes, your body is great, but not just for the look but because you're strong and agile."

Rouge blushed at Knuckles' comment, and the echidna went on. "You're also smart and funny. I've seen how great a leader you are and you don't take crap from anyone, which I admire. You're much more kind and caring than you let on. Overall, you'd make an excellent mother for the new generation of echidnas."

Rouge's smile grew bigger from those words, to which Knuckles blushed even harder and looked upwards and anxiously scratched the back of his head "...But on more 'practical' notes, you're one of the few women I personally know who also isn't already with someone else, with you and Shadow being completely platonic. I've always had... 'Feelings' for you... And I know you always felt the same about me, so... What do you say...?"

Rouge placed a finger to her cheek as she thought about it. "Hm... That is a pretty tall order you're asking of me, Knux. I never planned on being a mother, and you're asking me if I'd give birth to enough of your kids to get your species off of the endangered list..."

Knuckles sweated, fearing Rouge was going to reject, but nodded in understanding and kept listening.

"Although, things have gotten very uneventful and boring for me recently... With Eggman becoming less of a threat that only Sonic needs to deal with him, government work has mostly been paperwork and other boring shit. Nothing exciting has ever happened with my casino since those days with Emerl... And even treasure hunting isn't as much fun anymore, with pretty much every ruin and treasure having been explored and taken already. So motherhood could be a very good and wholesome change of pace. Besides, it's really hard to say 'No' to saving a species from extinction. Not to mention I'll be keeping much of myself alive through a LOT of kids, as well as contributing my exceptional qualities to the gene pool."

Knuckles formed a huge smile, however Rouge continued her thoughts. "But won't our efforts be futile? Without any unrelated echidnas, our descendants will have their echidna parts taken over by others. You'd have better luck with going to a group of genetic specialists and having new echidnas be cloned, gene-spliced, and all that stuff."

"Oh! Tikal has a solution for that! She didn't fill me on the details, only to see her once we're about to breed, but it's possible according to her. I'll definitely check out the genetic guys if they can help, though."

"Oh, the ghost girl of the Master Emerald? Heh, does this mean we'll have someone observing us if we do the deed? I wouldn't mind that one bit!" Rouge laughed aloud while Knuckles chuckled with a blush in response. "Either way, I can totally recommend you to genetic specialists working with the government! They'll be more than willing to help out with the echidna extinction problem."

Rouge placed a finger to her chin and studied Knux's body, starting at his head and moving down. "Now, as for me directly helping to bring those numbers up..." Rouge focused her sight on Knuckles' exposed balls (as men don't have to wear clothing and are commonly nude), which were resting on her couch cushion, and made a big grin. "Let me get a good look at your balls."

Knuckles blushed heavier and raised a brow. "Um... Okay. But why...?"

Rouge got up from her lounge chair and approached Knuckles. "Let's just say it's the main deciding factor for me. Now, get up and spread your legs."

Knuckles shrugged at Rouge's reasoning and did as she said, standing up from the crouch and spreading his legs, allowing his rather large testicles to dangle freely. Rouge then got on her knees and inspected the echidna's man orbs. "Wow, you got some massive nuts there, Knuckie! Would be more accurate to call them melons! And they're low hangers too! Those are the best type!"

Knuckles smirked from Rouge's praising of his package, as well as from some sheepishness at her studying his most private of parts. After getting her close-up view of Knuckles' testicles, Rouge moved her hand underneath the echidna-scrot and lifted up a bit to weigh Knuckles' spheres, earning a shiver from the echidna at the moment of touch.

"As expected, they're a heavy set, but still able to swing around with good air time. Truly, you got a pair of stones!" Rouge gave said pair a gentle squeeze, getting a feel for them and getting an 'Oh!' out of Knuckles. "Ooh, so smooth! Your balls and your scrotum! You have a really great set here, Knuxie!"

The echidna blushed in response and Rouge then moved onto another of the five senses, smell, and planted her nose onto Knuckles' bollocks, taking a big whiff. "Aah! I take it you've been sweating heavily today? Your scrotum is like a breeze from the sea~!"

"Yeah, coming to visit you was like a day's worth of exercise to my nuts." Knuckles joked, "And seriously? I thought you would be repulsed by the smell of sweat and other 'male musk'."

"Most women would be, but I'm not like most women, Knucklehead. I for one find the natural scent of men, especially in the groin, to be a delight." Rouge took another waft of Knuckles' sack, earning a proud smile from the man, and then focused her eyes on his beanbag. "With how good your balls smell, I have a feeling they'll ace the 'taste test'."

"Taste test? What do you-!?"

Before he could finish, Rouge gave Knuckles' babymakers a big lick, making the echidna shudder and moan with surprised pleasure. Rouge's tongue inched from the bottom of the scrote all the way to the top and upon finishing she swished her tongue within her mouth to analyze the taste of Knuckles' red sack. Rouge was clearly satisfied as she smiled with an 'Mmm...'

"So... What's the verdict?"

Rouge made a 'Pop' with her lips. "They are salty from top to bottom, the most ideal taste for anything worth calling balls." Rouge placed both her hands to her hips and gave Knuckles an approving look. "You've got a seriously great set of fruit there, Knux. The best of any man I've ever checked out!"

Knuckles crossed his arms and beamed with pride. "I'm not surprised! I maintain a healthy diet of fruits and vegetables, and exercise constantly, so my boys are overflowing with testosterone and sperm!" Knuckles heartily chuckled with a smile. "So, does that mean...?"

Rouge nodded. "Yep! I'll become a mother of many with you and help prevent echidna extinction."

Knuckles squeezed his eyes shut as he made a quiet cheer with a subdued 'Yes!' and did a small fist pump. The first and hardest step to his repopulation effort was completed, and with the most ideal yet least likely woman to boot!

"BUT! Only under one condition..." Rouge added, with a raised finger.

Knuckles froze in place at Rouge's exclamation and popped his eyes open to look at her. Knuckles did an 'Ahem' as he got back to normal stance. "Don't tell me! You want the Master Emerald?" Rouge opened her mouth to speak but Knuckles continued before she could say anything, "No problem! I now have a functioning house next to the altar, so if you decide to live with me on the island-!"

"Actually, for once, I'm not referring to the Master Emerald, Knuckles." Rouge interrupted, "Though that is a great bonus." she said to herself.

"Oh! My bad." Knuckles chuckled a bit. "So, what's your real condition?"

Rouge approached Knuckles in a slow, seductive manner. "If I am to repopulate the echidnas with you..." the tan-skinned bat got up close to Knuckles, her breasts squeezing against his broad chest, causing the echidna to shoot a glance at them with a surprised blush. "I get to do anything I want to your jewels..." Rouge moved her right hand to Knuckles' crotch and clutched his testes with a firm grip, earning an 'Oh~!' from the red-clad male. "Your family jewels".

Knuckles' face made it clear he was caught off-guard by that, but he soon cracked a grin. "Heh, I shouldn't be surprised after that little inspection of yours. I definitely welcome my balls being worshipped while repopulating, since that's obviously your kink."

Rouge closed her eyes tight and formed a massive grin as she giggled heavily, then started laughing aloud with her head pointed upwards, to which Knuckles' amused grin turned to one of nervousness. Rouge laughed for quite a while, still holding onto Knux's babymakers, and then forced her own laughter to end and wiped a tear from her eye with her free hand.

"Here's the funny thing, Knuxie. While 'ball worship' is a big kink of mine, my biggest kink is ball busting."

Knuckles was shocked to say the least, his eyes held wide open and his grin turned to a fearful frown. "B-b-ball busting...?"

"Mhm!" Rouge nodded, "A fair trade, don't you think? You get to use my womanhood to birth countless new echidnas in the world, I get to have fun with your huge, virile gems." Rouge tightened her grasp on Knuckles' orbs to grope them.

Knuckles grunted from the testicle groping and forced a grin of confidence. "I-I suppose that's fair. I know pregnancy is quite the burden, and birth is one of the most painful things in the world... But what exactly will you be doing to my happy sack...?"

Rouge glanced up in thought, still holding tight onto Knuckles' nutsack. "With my powerful legs and feet, there will be plenty of kicking! There's also flicking, slapping, punching, squeezing, pulling, crushing, and whipping." Knuckles winced at the actions Rouge listed, each wince stronger than the last as he imagined the mentioned action being applied to his prized testicles. "There's also orgasm denial, which causes this wonderful sensation called 'blue balls' that agitates the balls while leaving the man pent up."

Rouge squatted down and took a closer look at the bollocks in her grasp. "In fact, I think I'm going to turn your balls bigger and blue through a combination of busting and denial before we start with the actual repopulation." Rouge tightened her grip on Knuckles' babymakers, making his legs twitch. "I only accept sperm from massive blue melons. Or, given your red scrotum, perhaps they'll become eggplants, which will still do."

Knuckles laughed out of nervousness and pushed Rouge away in a gentle manner, making her release her grip from his orbs. "Whoa, okay now! I guess it's not surprising that someone like you would find pleasure in men getting hurt in the balls. But you do realize that harming my balls, especially in the ways you mentioned, is a really bad idea, right? You'll render me infertile and doom my kind to extinction! I mean, is this your way of getting out of becoming pregnant?"

"Of course not, Knuckie!" Rouge said in a calm tone, still grinning but her brows pointed upwards. "I want nothing more than for the echidnas to be a prominent species again and I'm not hesitating to get pregnant and birth many new echidnas with you." Rouge placed a hand to Knuckles' shoulder, the echidna's arms crossed. "Trust me, I won't damage your balls to the point of literally breaking them. I wouldn't dare sentence you guys to extinction. Besides, broken balls aren't fun to bust."

"Still, I don't know about this... I'm fine with doing uncomfortable things for you to compensate for the pregnancy and birthing you'll be doing. But allowing you to attack my balls to the point of becoming blue or purple...?"

Rouge removed her hand from Knuckles' shoulder and walked back a bit while locking eyes with Knuckles with a seductive smile. "Well, if that seems like too much for you, think of it like this..."

Rouge started unbuttoning her shirt, beginning at the bottom and moving to the top at a slow pace to tease Knuckles with her increasingly exposed torso, which succeeded in captivating the echidna. Soon enough, there was only one button on the pajama shirt left that was dead center in front of her breasts, which were putting much strain on the shirt at that moment as the top was no longer supporting all their weight, which made it clear to Knux that the busty bat was not wearing a bra, and the milk jugs were all too eager to escape their confines.

Upon undoing that final button, Rouge immediately spread her shirt open, allowing her DD-cup boobs to drop down with a jiggle and gave the spikey male full view of them, to which Knuckles widened his eyes in full and looked at the tan bat breasts with an open mouth, becoming additionally mesmerized by the sight of Rouge's nipples and areola both being dark, big, and succulent.

After fully taking her shirt off and letting it fall to the floor from behind herself, Rouge lifted both her mammaries up. "You already know about my bountiful breasts, which I'm proud to say have grown to an exceptional degree over the years while remaining in excellent shape. I've also been told that they'll be one of the most productive of all breasts, with high quality milk, should I start bearing kids. These would be more than enough to feed even a hundred of our children, if you make them with me."

Knuckles began panting and wagging his tail, then Rouge squeezed her nipples. "And these nipples are just perfect for our children's mouths! They're the right size and length to help them drink my milk."

Rouge then reached down to her pajama shorts and pulled them down, revealing to Knuckles her tan waist and legs as well as her lack of underwear, stepped her feet out of them, and then used her wings to float up in the air. Rouge rolled onto her back whilst flying and spreaded her legs wide, then spread her puffy labias open with her hand, giving Knuckles full view of her vulva.

"And my pussy is the best you'll ever find, being extremely tight during sex yet flexible enough to birth babies of any size." Rouge slapped the side of her brown rear end with her free hand "Further helped by my sizable hips." Rouge then moved that hand to rub her womb area. "And I've discovered not too long ago that my ovaries are not only much more plentiful than the average woman's, but extremely fertile. I'll be carrying multiples with each pregnancy Knux, and that's certainly great for your goal, no?"

"Y-yo-you got a great point there..." Knuckles admitted, his echidna member beginning to erect as a bulge was formed in his sheath.

"Also, consider that the girls we have can inherit my overflowing breasts and fruitful ovaries, which I assume Tikal can use her magic to guarantee for all of them. You and me alone can prevent echidna extinction. Our daughters, with my 'motherly' qualities, will get you guys off the endangered list altogether. And maybe even more."

Knuckles went 'Hm...' to Rouge's argument as Rouge landed back to the ground on her feet. "All in all, I'm truly the best woman for your needs, Knuckie! Nevermind that I'm the only available woman you know, but very few can match my breeding capability."

Rouge rested both hands to her bare hips "So, you've got two choices, Knuckles: you could choose not to repopulate with me to spare your balls the pain, but waste valuable time searching for an available woman or more and building a romantic relationship to breed with them, with their breeding capability being vastly inferior to mine. Or you could stick with me, a woman you are already in a relationship with who is willing to repopulate with you and has the perfect traits for baby making, and in return you'll simply endure pain to the testicles that I'll take great care to not result in castration. Oh, and of course your balls will still receive worship, just much less than the busting."

Knuckles placed a hand to his chin and lifted his head to deliberate those choices.

On one hand, Rouge's condition was still a tad too much, even with the promise of some ball worship and taking into account what she'd endure in this deal. Knuckles already felt like a joke among his friends despite all his strengths and accomplishments, allowing Rouge to harm his balls in almost every conceivable way would be the ultimate humiliation. The fact that Rouge intended on busting and denying his jewels to the point of turning a different color before getting pregnant with the first time meant that Knux wouldn't get to immediately start repopulating the echidnas and wait however long to do so anyway. Besides, Rouge was most likely playing up her fertility to make Knuckles choose her, taking advantage of his situation to satisfy her sadistic kink.

On the other hand, it was true that finding another woman to breed with would be a lengthy process in of itself. And Knuckles would have to form a close, romantic relationship with them before he can even think of asking them if they would repopulate the echidnas with him, their answer most likely being 'No' since most women these days don't want to birth children for many valid reasons, making Knuckles' efforts pointless and wasting his precious time. However long it would take for Knuckles' balls to turn blue, or purple, it would take a whole lot less time than finding a woman willing to breed with him, especially if Rouge busts and denies them frequently with great force.

Having his beloved testicles abused and changed to a different color was going to suck, but Knuckles could tell that Rouge was sincere in breeding with him upon accepting the condition. And if her fertility is really that freaking good, then it would make going with her all the more worth it. After all, sometimes one must suffer to bring about great good, so for the sake of echidna kind, Knuckles would sacrifice his precious stones to Rouge.

With his thoughts finished, Knuckles let his hand down and got back to eye level with the naked bat. "Alright Rouge. So long we start fucking like rabbits the moment my balls are blue'd to your liking, you can do every single thing you want with my 'jewels'; as frequently as desired each day with as much severity as possible."

Rouge's grin turned into a huge smile and cheered aloud. But Knuckles continued on whilst pushing his fingers together. "But can we keep this whole thing solely between us? I don't want the guys, especially Sonic, to know that I've let you take complete control of my balls..."

Rouge made a coy expression. "Aww, I can't tell absolutely anyone?"

"Er... I guess you can tell someone who can keep a secret and won't mock me for it, like Cream and Vanilla..."

Rouge returned to her huge smile. "You got it!" she excitedly extended her hand to Knuckles, "So, we got a deal?"

Knuckles looked at Rouge's hand with a brow raised above the other. Rouge usually didn't act this excited, being the most reserved of his female friends unless in the presence of valuable gems, so it was very telling just how much she wanted to bust his balls. An amused yet nervous grin manifested on Knuckles' muzzle and then the red echidna swung his hand back, collided it with Rouge's, and the two grasped each other's hands.

"You bet! Let's do this!"

Knuckles and Rouge then shook each other's hands, sealing the agreement between the two. It was now all but ensured that Knuckles would soon no longer be the last living echidna and Knuckles' huge smile reflected his joy at that, even as this arrangement comes at the cost of his massive, productive testicles.

The two newfound mates finished their handshake, and right at that moment Rouge pulled her right leg back and tightened her grip on Knuckles' hand, the male raising both brows in response.

'BAM!'

Rouge pulled Knuckles to herself and, in that instant, delivered a fast and powerful knee to Knuckles' scrotum, hitting it directly from underneath. Knuckles groaned as the air in his lungs escaped him and would've bent himself over in the front if his body wasn't already right up against Rouge; the echidna resisted the urge to squawk in pain from the impact of Rouge's knee to his bollocks.

Rouge breathed a deep inhale, and then released a sigh of immense pleasure. "Aaaahhh~... After years of using fake balls and watching other women bust their men... I finally get to bust a real set ~! And it's the most superior kind that belongs solely to me~..."

Rouge moved her free hand to rub at her then wet clit as she pressed the echidna orbs up against Knuckles' pelvis and thighs, the fruitful spheres forced away from each other on opposite sides of the bat's tan knee as they were being flattened, to which Knuckles squealed in a quiet volume.

Seconds of this crushing knee press passed when Rouge lowered her knee and straightened her leg back to the ground in a swift motion, letting Knuckles' sperm factories fall back down to their usual spot, but their greater weight caused them to bounce around, the motions making even more pain for Knuckles.

Once the echidna testes settled, Rouge moved herself away from Knuckles but held both his hands with hers and supported him up as he recovered from the sudden blow, panting with squeezed shut eyes.

"Sorry about that, Knuckie. Truly." Rouge said in a comforting tone, with the expression to match. "I just waited too long to bust an actual set of balls and couldn't help myself."

"Urgh... It's fine... Better to experience the first strike sooner than later to end the dread..."

Rouge responded with a soft giggle. "Rest assured, you won't be getting another hit down there for a good while. Consider it a preview of what's to come. But for now, I want to move into that house of yours on the island before actually beginning the ballbusting, and the echidna repopulation. This house has plumbing, electricity, heat, and air conditioning, right?"

"Mhm! It's got every household necessity..." Knuckles grunted, still feeling the testicular ache. "According to Tails, at least. I've never checked for myself since I never really used it much..."

"Tails' word is enough for me." Rouge released Knuckles' hands, twirled around, and walked on. "Alright, let's get started packing my things! I won't officially be moved in until every last of my possessions are in your house unpacked. So the sooner we do that, the sooner I can turn your balls blue, and the sooner you can impregnate me with the first brood of echidnas."

Rouge turned her head back toward Knuckles and winked at him. Knuckles gave the bat a thumbs up in return and got to work packing her items, even though agony still lingered in his loins.

"Unf! Better get used to this, Knux." he said to himself. "You've got a lot more coming soon..."