“I’m just saying, your new policies are great, but it doesn’t make sense to push a narrative of love, when despite being the first changeling ruler to have the ability to do so, you have yet to mate or marry.” Thorax groaned at his brother’s lecturing.

“Sorry, Pharynx, but I’m not interested in any changelings right now. Let it go.”

“Who said it had to be a changeling? Haven’t you been fucking that dragon friend of yours?” Thorax made a choking noise that quickly devolved into a cough. Pharynx ignored his brother's indignant cry, instead continuing to push on. “I’m just saying, if you’re gonna marry out of hive, he’s not the worst choice. Even if he is a little young for you.”

“Number one, he’s older than me. Number two, I doubt he’d take kindly to being… Actually, he might take to it quite well. But what if he doesn’t-” Pharynx held up a hoof to cut off Thorax’s rambling worries.

“Thorax, cut the crap. I don’t need to sense love to see how he looks at you. He’ll accept if you propose.” And with that, he left Thorax to stew in his thoughts. Thorax turned and entered his room, to pull out a history book written by one of the hive’s scribes. He sighed as he reviewed the chapter he’d deliberately avoided time and time again.

Explaining that he’d have to geld Spike, even temporarily, would be a pain in the ass.

So, a traitorous part of his mind decided to intervene, Why tell him directly. Use his kinks against him. Disguise it as a serious act of emasculation. And if he says no, then explain it to him, or let him be.

Thorax let the thought marinate, and then he smiled.

Spike would love it. Or at least he hoped he wouldn’t be too opposed.

"So, you wanted to try something new?" Spike asked the question gingerly, no matter how open changeling society was about love of all forms, he'd never get used to discussing his sexual escapades.

Honestly, Spike was glad he'd went with his gut and asked Thorax to fuck his brains out that time they were both drunk and horny. The relationship might have started off with alcohol, but slowly it happened again, and again, and the more frequently he and Thorax made their way to Thorax's bed chamber, the more frequently friendly hugs and chaste kisses turned into the all-engulfing love of a changeling king pleasing his mate. Thorax was a perfect lover, dominating, but always willing to keep Spike's limits in mind and he took aftercare seriously. Very seriously. After a romp, Thorax fretted over Spike, sending drones for water and snacks, and making sure that he remembered that Thorax cared about him greatly.

"Yep! It's a little... odd, so if you get uncomfortable, just say the word, and I'll go straight back to vanilla. Or, as vanilla as we get." See, kind. There was an undeniable smile on Thorax's face, and no-one knew Spike better than Thorax. Hell, Thorax might know him better than he knows himself. He had no doubt he was gonna love this.

"Now, my dear dragon, I hope you're ready-" His horns lit up briefly, and a wash of teal spread over the room. A silencing spell. "Because I plan to either have you screaming, or moaning my name." Thorax's tone was always different during sex. It was sultry, deeper, yet maintaining the same kindness that made Spike so willing to give himself to Thorax entirely. Spike threw himself on the bed, ass out, and spread his legs, ready to see what Thorax had for him.

"Look at you. So eager to give yourself up. I'd call it pathetic, but it is quite... endearing." Ooh boy. The combo always hit Spike hard, and it sent a shiver racing up his spine, and as Thorax approached, cock fully unsheathed, he felt himself make a noise somewhere in the back of his throat. He always forgot just how big Thorax was. The first time he saw Thorax's dick, he was drunk, and the only thoughts he remembered having were, 'In me, right now', but since then, he'd come to appreciate it better. It was neon blue, and started off wide at the base, and tapered inward, with three rings just before the head, and bumps and knobs covered it, more closely resembling an insect rather than an equestrian. All he needed to know though, was that it felt good going in, and out. "How about you prepare me a little? I doubt you can take the whole thing, so do what you can manage."

When Thorax reached him, he dove for the floor, and got right underneath Thorax's belly, face to face with the monster of a penis that would always got him hot and bothered, hooves or claws free. Speaking of which, he felt his cock stirring in it's sheath, and he felt his heavy balls churning. He remembered when he first explained how his balls worked to Thorax, the king had been utterly astounded. To prevent damage when flying, or to prevent blows to what would become massive boulders when he became an elder dragon, his balls, like his dick, remained mostly inside him until sexual situations, when they dropped down to cool off, and produce his potent seed when they needed too. Twilight had a field day when she found out, and he assisted her in writing unfortunately detailed descriptions of his genitals’ behavior. "I always forget just how minuscule your dick is by comparison." Spike made another one of those throaty noises that Thorax loved.

Another thing that made Thorax's dick so appealing was the size difference. He was a little over average for a dragon his age, but in comparison to the ginormous equestrians, he fell short at around 7.5 inches to Thorax's 13, which he still didn't understand how it fit inside of him. He swirled his tongue around the head, before taking it into his mouth and continuing the motion, as Thorax moaned his approval above him, calling him all kinds of names that made his heart flutter.

"You're incredible..." Spike smiled around the dick in his mouth. If Thorax thought this was incredible, wait until he saw what came next. He had a neat new trick up his sleeve that he'd been practicing. Upon learning the dragons don't have much of a gag reflex, if any, he quickly developed his talent, and now he was ready to show it off to his lover. He sank deeper and deeper on Thorax's cock, until he reached the base. He felt Thorax's knees buckle above him, and he pulled off, placing one more kiss on Thorax's head, before lifting himself onto the bed, and exposing himself fully to his lover.

Everything was alright until Spike swallowed something impossibly large, and Thorax's mind simply could not comprehend what just happened.

Seriously, everything about Thorax was huge in comparison to Spike, so the fact that he managed to take Thorax all the way to the base? Well, let's just say it did things to Thorax.

He was on top of Spike instantly, teasing his entrance with the tip of his dick.

He was very thankful they learned dragons could self lubricate early on.

He pushed forward, and Spike fell apart, groaning in pleasure as was impaled, and Thorax stopped once he felt resistance. Spike may be able to deep throat, but he can't get more than two-thirds down without hurting himself. They've tried. Thorax pulled out, slowly, letting Spike feel every bump and ring, before forcing himself right back inside, drawing another choked gasp out of Spike. When he reached down, to touch his aching, needy prick, Thorax swatted his claw away.

"I want to see you cum without touching yourself." Spike's hands flew behind his head at the command and Thorax resumed his pace, pulling out slow enough for Spike to really feel it, before slamming back in.

Then something changed.

Spike had warned Thorax about his adaptability before hand, citing his resistance to Twilight's magic had grown as time went on, and that he'd be able to adapt to gain more pleasure from things as time went on, or to take more. He realized just how right Spike was when in the middle of their third meeting, he went from barely being able to take Thorax's head to taking a third of it in one go. He did it again around their 10th time. Now they were on their 26th time, and they had stagnated. But then, on one thrust he sank deeper than he had before, and paused. He looked up to see that Spike's face wasn't in pain, but rather panting confusion.

"W-why'd you stop?"

"Take a look." Spike leaned up, looking down in between his legs, to see that he'd managed to take Thorax up to the base. He smiled, and looked at Thorax with a sultry look in his eyes.

"Remember what I told you the first time we fucked?" Thorax remembered alright, and he planned to oblige. He set a breakneck pace, pulling out and slamming back in as fast as he could. Spike gripped his sheets with a fervor, his own needy dick forgotten in the haze of lust and pleasure he felt as Thorax pounded his ass relentlessly.

"Thorax!" He came first, spraying his load all over Thorax's bed, and Thorax just kept going. Eventually, while Spike came back down to earth, Thorax finally came, and painted Spike's insides white with the fertile seed of a changeling king. The two of them breathed heavily in sync, coming down from their joint high.

"I knew I could make you cum without touching yourself at all." Oh, Thorax was still going. "Hell, now that you can take me all the way, you probably don't even need your... smaller package. Not to mention that you'll probably never need those pebbles you call jewels." Spike's dick stirred at the verbal abuse, and he looked at Thorax with love, and a hint of embarrassment.

"How about I get rid of it entirely?"

The question struck Spike like a lightning bolt, and in his sex-hazed stupor, it took him a minute to process it. Thorax had just asked if he wanted to be made a gelding, giving up a part of himself permanently in a moment of bliss.

Why did he find himself so aroused by the idea? Was it the emasculation thing, or was it something else. He looked in Thorax’s deep purple eyes, and saw a myriad of feelings, but the one he saw the most of, was nervousness. Like he’d just revealed a hidden desire and was afraid he’d be taunted for it. This went deeper than just wanting to geld him, but Thorax wasn’t comfortable telling him yet.

He’d wait as long as his love needed to. But for now, Thorax needed an answer, and so did Spike.

He found his pretty quickly.

He nodded, and Thorax gave pause, and broke character for a second.

"I'm not forcing you do this Spike. If you don't want me to, I won't." There it was again. Like he was asking something else, behind the prospect of gelding him. Sure, that was a big question, but he wasn’t locking Spike into anything. Spike had never decided if he wanted kids, and he certainly wasn’t opposed to adopting. Spike smiled up at his love, and sealed his fate with two words.

"Geld me." Thorax's smile was his normal one, kind and friendly for a brief second, before turning into the sultry smile he'd begun to regard in a different light to regular Thorax. He produced a surgical knife of sorts, and set it off to the side. His throat glowed bright green, and Spike half expected him to transform into something better suited for using a sharp object, but instead, he spit a sticky green paste into his hoof, and began spreading it over Spike's balls.

He remembered something that Thorax had talked with him about before, his designation as a healer prior to Chrysalis’s dethroning. The conversation ended up turning into a demonstration of Thorax’s ability to produce various chemical gels for various purposes, like an in-body apothecary.

“It’’ll numb any pain, but if I’m right, I think you might want to watch.” Spike leaned forward to see as Thorax really and truly took away his balls. His magic pulled his nuts to the bottom of his sack, and Thorax made two quick incisions along the bottom of Spike’s soon to be empty scrotum.

Thorax pushed downward, and Spike’s light pink testicles dropped right out of their home.

It's a weird feeling seeing something that's supposed to be inside you, outside of you. Thorax produced two clamps and placed them on his cords, completely shutting off blood-flow to his poor, soon-to-be-removed nuts. After giving it around a minute to really kill any chance of their survival, Thorax made quick yet clean cuts, and severed the cords connecting Spike's nuts to his body, and placed them on the bedside tray atop the table occupying the space next to Thorax's bed. And that was that. A new goo was produced from Thorax, and it left the feeling of anti-septic on the cuts in Spike's sack, and the ends of his cords still connected to his body. Thorax carefully stitched up the incisions, and that was that.

He was really neutered for life. Thorax made to put away the surgical knife, and Spike spoke up before he could.

"Dick too. Dragons can't keep it up without their nuts, no reason to have it."

“Are you sure? Wouldn’t that make it harder to use the bathroom?.” Spike shook his head.

“Dragons have two separate channels. On us, penises are pretty much just for sex. Besides...” He turned his head and murmured something Thorax couldn’t catch.

“What?” Spike blushed, and kicked his legs like did when he was nervous.

“It was really nice to watch you cut off my balls.” Thorax blushed too, but nodded. He coated Spike’s dick in the same gel as before, and it coaxed a response out of Spike in the form of a moan.

“One more?” Spike nodded, and Thorax brought Spike’s dick into his muzzle, repaying the favor Spike had given him earlier, and it didn’t take long for Spike to blow his second, now infirtile load of the day. Thorax tied off his dick at the base, and when it grew to a darker purple than it had been prior, the same knife that had made quick work of his nuts, removed the last of his sexuality, in one fell slash. Thorax placed his severed dick into a tray on his bedside table, alongside his nuts.

Spike had just been made into a full eunuch, and he didn't regret it at all. Thorax didn't either, given that he nuzzled Spike lovingly after. Spike deepened the gesture, and kissed him on the lips, finding his new situation excited him greatly.

"You want to spend the night here?" Spike looked over to a window, and saw that their roll in the hay, and the removal of... some parts had taken almost 2 hours, and it was quite dark outside.

"Sure. Honestly, I get the odd feeling that I should thank you." He lay on top of the covers, not wanting to aggravate his semi-self inflicted wounds, and Thorax, ever kind as he was, curled around Spike protectively.

“Maybe it was one of those subconscious things. Something we want deep down, but don’t tell anybody.” Spike shrugged, and found himself caught in a yawn. He snuggled closer to his love, hiding himself in Thorax’s chest. "You were very brave today, my little eunuch." Spike smiled, and drifted off into a calm, dreamless sleep.

Upon Spike falling asleep, Thorax laid there with him for an hour or so longer, before getting up to go discuss with his brother, and to get Spike his proper garb. They were, in the eyes of the hive, engaged after all.

The walk to Pharynx’s room was short, and by the time he was there, his heart was soaring as the real meaning of what just happened dawned on him. He knocked on Pharynx’s door, completely forgetting that it was the ungodly hours of night. Which is why he was surprised when his brother swung the door open angrily, bags under his eyes.

“What. Do. You. Want.” Thorax was unphased, his smile much too bright for that time of day, which confused Pharynx until he spoke next.

“Spike and I are engaged!” Pharynx gaped, before rubbing the sleep from his eyes.

“I’ll gather a garment worker and a carver immediately.”

When Spike woke up, he was... well, he wouldn't say fully dressed.

He was wearing a silky cloth that the changelings used frequently, as a sort of wedding veil, and he wore a pair of semi-transparent panties that showed his empty sack and sheath to the world, and he felt the event of the night before with Thorax crash over him, and he looked over to the bedside table to see exactly what he was expecting, his dick and nuts, gone cold overnight. He got a morbid bit of curiosity looking at them. He was an omnivore after all.

He grabbed one of his former testicles, sniffed it, and was slightly put off by the fact that it still smelled like him. He popped it into his mouth and chewed.

He'd never admit just how excited eating one of his testicles would have gotten him if he still had a dick. It was then he noticed Thorax standing in the doorway.

"Thorax! I-uh..."

"Did you just eat one of your own nuts?" Spike averted his eyes. "I'm not gonna judge you, last I checked we feed on love. A non tangible emotion. How weird is that?”

“Very. I still don’t understand how it works. So…” He kicked his legs on the edge of the bed. “About last night…”

“OH! Right, I have so much to explain. So about the whole, y’know, gelding you thing, it was a kink thing, but it also has a deeper meaning.” If anyone asked, Spike called it. “How much do you know about Changeling marriages?”

“Oddly enough, not much. You guys are pretty mysterious about a lot of things.” Thorax nodded.

“Okay, so this is a minor history lesson, so sorry if I bore you.” Thorax sat down on the bed next to Spike. A few years ago, Spike wouldn’t have been close to head level, but now, he fell right under Thorax’s chin. “So, despite how close we’ve gotten to ponies in build, we were, as a race, much more bug-like thousands of years ago. Random attributes of different bugs thrown in, more specifically, a part of our biology that made it to where after a male changeling ejaculated, he began producing an enzyme that would make his uh… his nuts would explode.” Spike’s eyes widened.

“Holy shit.” Thorax nodded.

“Yeah, It would kill you around 80% of the time, and if you survived you’d be lucky to be able to walk ever again. Still though, it took a few days, so we came up with a solution. If your nuts aren’t attached they can’t explode. Back then, they did it with blunt rocks and no way of numbing the pain.” Spike winced, and was suddenly even more glad that his boyfriend was a healer. “We kept doing it, even when it became clear that we’d unevolved the gene that caused a testicular explosion. It became a symbol of devotion, to give up a part of yourself. Eventually, after another evolution that let us do minor regeneration with the cocoons, it became a popular thing to do it before your wedding was made official. For five days, you remain a gelding, both because enduring the hormonal changes that come with it shows devotion, and because when you regrow your nuts, your fertility grows.”

“How does that work?”

“It's basically imbuing energy straight into them, giving them a boost. It was outlawed during Chrysalis's reign, since we were pretty much at war then, and even if you got your nuts back, your aggression level dropped pretty much permanently.” Spike scowled, but Thorax continued on.

“Anyway, we discovered a while back that after the metamorphosis, it works on any creature you share love with, after a drone cocooned his pet in the hopes that it would heal him, and what do you know, their bird came out good as new, and just as friendly.” That made something click in Spike’s mind.

“Wait, you said that having your mate geld you symbolizes marriage. Did you propose to me by cutting my junk off?” Thorax tapped his hooves together.

“Are you saying ye-” He was cut off as Spike dragged his face down to kiss him deeply, releasing him only when they needed to come up for air.

“Yes I am.” Thorax lit up with a smile, and nuzzled Spike lovingly.

“Well then, I hope you can stay like this for five days.” Spike scoffed, and waved his hand.

“No sweat. I might even go for longer. I could get used to having nothing down there.” Thorax shrugged.

“Go as long as you like, but at some point you’re gonna have to mate me for real.” Spike’s confusion must have shown on his face, because Thorax stood up and lifted his tail to reveal his taint, and a dark blue slit, which was unmistakably a vagina. Spike’s jaw dropped. Thorax laughed at him. “Any male changeling royalty is hermaphroditic Spike. Pharynx is too. But you don’t need to worry about him, after all…”

“You are engaged to me.”

If Spike still had a dick, he’d be full mast.

Author's Note

This idea has been in my head for I don't know how many days, so I wrote it out. I've got two more related ideas, so those might happen at some point. I know just as well as anybody that no castration story is gonna get an overwhelmingly good response, but if you have negative comments just about the subject, keep them to yourself. Of course, I love constructive criticism, so that's just fine.

Although we don't see the reversal of Spike's castration, it will happen in another story, more than likely. As well as the Mane 6's response to Spike's emasculation.