Spike held Rarity in his arms and fell backwards, ensuring that he ended up on his back with Rarity on top of him in the cowgirl position. Spike gripped Rarity's hips and barked at her "Ride! Ignore the excruciating pain you must be feeling from having your anal virginity taken and ride me! My cock is already in your tight booty so you might as well get going and try to enjoy yourself!" Spike punctuated the end of his sentence with a swat to Rarity's left ass cheek, after seeing that Spike wouldn't be taking no for an answer, she did the only thing she could and started bouncing herself up and down on Spike's lap and focused on relaxing so she could enjoy having her butt filled with huge veiny cock. Rarity was beginning to pant, the exertion and energy of all of this sex was making her overheat, she rode even harder and faster as she basically tore off her pajama top, allowing her decently sized tits to jiggle with every movement she made. Spike grinned and said "Yeah, for a girl who spends most of her time making clothes it's incredible that you've never realized how fucking good you look when you're naked, especially when you're working to make me nut in your butt... damn your ass feels good, I'm glad to see you've taken a liking to having your rump filled so quickly and easily, you'll earn the right to have my fat sticky load deposited up there in no time..."

It was true, the more Rarity accepted her fate, the more pleasure she felt, the more actively she started wanting Spike to claim her rear, even if he was only doing it to conquer her body. Rarity increased her rhythm, the incredible feeling of fullness in her bottom driving her to get Spike closer and closer to his climax as a sign of gratitude, Spike welcomed it happily, it wasn't as wet as her pussy or her mouth but damn was her ass so hot and so so damn tight, hugging his cock like a soft fleshy glove jerking him off. Once Rarity had fully embraced the butt fucking she was willingly engaging in, she groaned when her pussy clamped down on nothing as she experienced yet another maddeningly strong orgasm, soaking Spike's midriff with her gushing fuck hole. The caress of Rarity's anal walls became too much, seconds later Spike joined in with Rarity as he grunted huskily, his nuts once again tensed and his cock pulsed while he spilled a full virile load deep inside Rarity's behind. When they both came down from their high and were about to enter a satisfying afterglow, Spike was the one who got a surprise when when Rarity lifted herself up off of his cock, only to lie down, take his dick into her cleavage and start rubbing her tits up and down his slick length.

As Spike looked down to where Rarity was massaging his still sensitive prick, he saw Rarity staring back with a frightening smile and wild bloodshot eyes. Rarity kept up her boob job and said "Yeah? You like these tits you filthy little shit?! You're still fucking hard, so nut for me you bitch! Do it all over my face and chest! I don't care if you're a dragon or a dog when you visit, so long as you're constantly raping me then I'm happy! I don't give a shit so just cum for me! Cum cum cum cum cum cum cum FUCKING CUM!!!" Spike was hardly able to turn down that request and so, the final load he had to give was sent rocketing out from his cock, strands of it landing all over Rarity's face and onto her breasts. When he finished, Rarity rolled over, giggling like an insane woman with tears streaming down her face until she fell asleep. Spike got up after a quick rest and returned to Equestria with a job well done, now he had two versions of Rarity who would beg and plead that he hurt and dominate them as much possible.

• meanwhile -

As soon as Spike had left for the human world, Sludge had to fly to the dragon lands due to being summoned by none other than dragon lord Ember. Sludge wasn't sure why he had been summoned and if he was being honest with himself he would've preferred to stay in Ponyville so he could keep banging Twilight, who had become borderline obsessed with having Sludge pound her holes at every opportunity no matter how bruised she got after a fuck session when he was feeling more horny than usual. As Sludge clumsily landed in the dragon lands, he looked up to see Ember looking at him with a somewhat neutral look on her face, almost as if she wasn't happy to see him but wasn't unhappy either. Sludge dusted himself down and said "You wished to see me?"

Ember nodded and said "Sludge, you are Spike's father, is this correct?"

Sludge panicked briefly, only to realize that he could easily keep up the lie, how could she check? Nobody knew who found Spike and where, there was no way Ember would be able to figure out if he was lying, might as well keep up the charade! Sludge cleared his throat and confidently said "Yes! I am Spike's father!"

Ember continued by going "Spike's mother is deceased, is this also correct?"

Sludge nodded, making sure he seemed somber and sighed out a "Yes... his mother is... no longer with us"

Ember hummed in thought "Very well Sludge. I wish to give Spike a mother here in the dragon lands and at the same time I also wish for there to be more dragons like him, I don't know what it is about your genetics or lineage but Spike is different to other dragons, strong, compassionate, he embodies everything I want for the future of our race. So, if you are willing, my third wish is for you to breed me"

There was a moment of silence, Sludge was surprised to say the least, he had just been given the opportunity to mate with Ember, the most powerful and arguably most attractive dragon in the dragon lands. Sludge figured if he was to take Ember up on her most generous offer, he may as well see what else he could get out of it while he still could and make sure he wasn't stuck with only Ember as a sexual partner, Sludge simply went "I have some questions"

Ember nodded and said "Go ahead"

Sludge said "So... in terms of us having sex, is your pussy the only thing I get to stick my dick in?"

Ember went "It may come as a surprise that while I will try to avoid unnecessary touching of your cock, I am willing to be somewhat accommodating. I can use my mouth to make you erect and I'll even let you take my rump, that is as far as I'm willing to go and is not something I ever intend to negotiate"

Sludge was happy with that, though considered it a shame that she was only willing to blow him to get him hard, Sludge's next question was "OK, well are you the only sexual partner I get to have?"

Ember rolled her eyes and went "No, fuck whoever you want, stick your dick in a beehive for all I care. So long as you're willing to fuck me every now and then for breeding purposes, or for pleasure if you like, then you can do whoever you want"

Sludge had one last query, this was the one he was most scared of as he said "How much involvement do you want from me... like, in terms of being a parent?"

Ember simply went "However much involvement you want, I want you for your DNA, not your skill as a father, so you can be a dad to all the children you give me or you can completely ignore them, either way is fine", well, that put all of Sludge's worries to rest, time to get the show on the road!

Sludge said "OK Ember, let's do this!" Sludge's cock was already hardening at the prospect of being able to claim her, which in and of itself was quite a feat. Dragon lords had a history of being very picky when it came to sex, it was lucky that Ember was so woke, or at least as woke as a dragon lord could get when it came to prudishness in sex. Ember silently just dropped to her knees in front of Sludge and effortlessly slid his entire cock into her mouth in one go, almost sucking him off in a violent way as she coiled her tongue around his shaft. Sludge wasn't expecting such a quick impromptu blow job and gasped "Holy shit! Whew... damn.." as he placed a claw on Ember's head, which she quickly slapped away as she began moving back and forth. Ember was giving a really good blow job... for about two minutes, the second Sludge was fully erect she pulled herself off of his cock, which would have been disappointing had she not immediately got on her back with her legs wide open to invite Sludge to penetrate a much more pleasurable hole. Sludge, in true dragon fashion, practically threw himself onto Ember and rammed himself into her pussy, immediately thrusting as fast as his fat lethargic lizard body would allow.

Ember grunted and said "Sludge... nng... while I... aahh... appreciate your desire to... oohh... to breed me as efficiently... grr... as possible, I think it... fuck... it would be better if you... holy shit... slowed down a bit!" Unfortunately that request fell on deaf ears, if anything Sludge only became more eager to fuck her as hard as possible, though it wasn't like he could help it. Sludge never ever got any action in the dragon lands and while ponies where more relaxed and soft when it came to sex, nothing could compare to a dragon, at least not to a dragon. It soon became clear that Sludge wasn't exactly a great lover when it came to making sure the one who had been gracious enough to receive him got to enjoy it as well, he could last a decent amount of time with a pony because while the sex was nice, it was less nice than the inside of a dragon female, the problem being that now he was fucking a dragon female he came after only a minute or so of humping away at her pussy. While Ember did consider it pathetic that Sludge couldn't last very long, she wasn't really complaining, the way he had sex was clumsy and she didn't even really find him all that attractive either, she was simply thinking of the exceptional children she would get to bear.

Sludge pulled out, gasping for breath as he said "Sorry Ember... I've-"

Ember raised her claw and said "Don't apologize, believe me when I say your fast and furious pace was beneficial for the both of us", Sludge didn't know whether to feel proud or offended, so he just remained silent. Ember spoke once more as she said "Now if I recall the terms of our deal, you want my backside, don't you?" Ember stood up before turning away from Sludge and bending over, calmly sticking out her fat round bottom and waiting for Sludge do what he so obviously wanted to do, fuck it. This time Sludge didn't wanna just hammer away at her, so he decided that rather than going for speed he'd go for strength, why fuck an ass when you had the power to pound it hard enough that you made it hurt in a good way? Sludge clapped his claws onto Ember's ass cheeks as the head of his cock prodded at her pucker, Ember curled her tail around Sludge's torso to keep it out of the way while also encouraging him to move forward and take her rear. Sludge took a deep breath and rammed his cock to the hilt in Ember's back door, his hips slapping up against her thick booty as it jiggled from the force of the impact like two big bowls of jello.

Ember groaned at the rough penetration and slight discomfort of being so suddenly filled, she looked back over shoulder at Sludge and said "Geez, wanna hold yourself back there big guy? I know I've got a sexy ass but that doesn't mean you have to slam your big stupid cock up there like a fucking battering ram", Sludge had no response to give as he continued his motion of long, hard thrusts, pulling out until just the head of cock was still in then sliding all the way back as hard and as deeply as possible, paying no heed to Ember's slight annoyance at how he had chosen to go with repeated powerful thrusts with a three to five second interval in between each one. However, this did benefit the both of them, Sludge was enjoying the confines of her caboose without cumming too soon and, despite her growls and grunts, Ember was actually really enjoying herself, having already experienced a very well-hidden orgasm three minutes into the anal sex.

Soon enough though, Sludge could feel an all too familiar feeling in his groin and decided to, quite literally, go out with a bang. He spanked Ember's right ass cheek shortly before ramming her fuckable butt at much the same pace that he had used on her pussy, Ember groaned loudly as she experienced another orgasm, slightly weaker than the last one, shortly before Sludge made the same noise and filled her rear entrance with thick ropes of hot, heavy spunk. Ember unfurled her tail and allowed Sludge to pull his cock out of her ass, his fuck technique may have needed work but they both knew he had the enthusiasm to make up for it.

• months later -

Sludge was having a rather uneventful day in Ponyville, the only really exciting thing that had happened recently was when Spike returned home and proudly declared that he had managed to sexually break and conquer the human version of Rarity, something which made Sludge extremely proud. Sludge walked into the castle and was faced with a rather interesting sight, Twilight, Rarity and Ember were all stood there with ridiculously large bellies as a result of being heavily pregnant, which was a sexy sight, though Sludge didn't fully understand the context. Rarity looked at him and said "So... dragons and ponies are not compatible are they? What the fuck do you call this?"

Sludge shrugged and said "It's not necessarily mine, Spike could be the dad"

Rarity deadpanned and said "I think you're rather missing the point"

Sludge ignored her and said "Well Ember, I know you're happy with your pregnancy, what about you princess?"

Twilight blushed and avoided eye contact as she said "It will be... interesting for study purposes..."

Rarity sighed and said "Well, I can't exactly stay mad, after all Spike and I are so happy together and that is all thanks to you Sludge, despite the unorthodox method of how we both entered into a relationship"

Sludge went "OK, though that doesn't explain what you're all doing here"

They all smirked and gave each other knowing looks before Ember said "Well, all three of us agree that you deserve some kind of reward and since you never got much action in the dragon lands... how about you make up for lost time with us three?"

Sludge grinned as his tool began to throb, today had just gotten a whole lot better.

The End

Author's Note

Thank you osmar lael & I_am_IronPony for this story idea! I hope you enjoyed it :)