As Cozy Glow continued her almost therapeutic suckling on Tirek's cock, she froze as she heard a familiar voice from above her say "You know, for an inexperienced young pony, you're not too bad. I also have to admit that you having the body of a filly does have its perks". Cozy Glow looked up and as she expected, she saw the devious smile of a fully awake and fully aroused Tirek. As she moved to remove Tirek's cock from her mouth, he placed a hand on her head and pushed her back down before saying "Well I didn't say you had to stop, if we're really going to be here for all of eternity then we might as well try to have some fun, wouldn't you agree?" Cozy Glow nodded rapidly and began sinking Tirek's dick into her throat.

As Tirek relaxed and enjoyed the warm tightness of Cozy Glow's throat, there was a loud throat-clearing noise as someone happened upon the scene. Tirek looked up from Cozy's face as she briefly paused her ministrations, as both of them turned the attention to where the noise came from, who else was stood there but Chrysalis, having returned from her exploration of the catacombs. She didn't look shocked or disturbed, in fact she just seemed a bit sarcastic as she said "So, I see you two decided to get better acquainted while I was gone?"

Tirek chuckled and said "You could say that, I must say little Cozy Glow here is actually surprisingly good"

Chrysalis burst out laughing "For a filly maybe!" Chrysalis walked over and sat next to Cozy Glow before pulling Tirek's cock out of her mouth as she said "Watch and learn sweetie, let me show you how a real mare sucks cock". Their was brief pause before Chrysalis took in a deep breath through her nose, then launched herself forward and practically swallowed down the entirety of Tirek's dick, her nose pressed right up against the base. Tirek was not expecting that at all and groaned in surprise, but when Chrysalis start blowing him, he relaxed and just enjoyed the ride.

Cozy Glow studied Chrysalis and her blowjob technique with genuine interest, Chrysalis pulled herself back up to the tip, then would swallow it all back down again, up to the tip, swallow it down, she repeated this pattern over and over again, the only difference being her increase in speed the more she did it. With the kind of expert deep-throating Chrysalis was deilevering, Tirek wouldn't last much longer, as Chrysalis simply got faster and faster Tirek's willpower slowly ebbed away until he let out a loud roar, blowing his load into the changeling's mouth.

Chrysalis held Tirek's dick in her mouth as he emptied his balls inside her, letting her cheeks fill up and then swallowing to make room for the next few shots of cum. After swallowing her third mouthful of jizz, Tirek finally finished, allowing her to remove her mouth from his softening cock. "Aah..." went Chrysalis "You see Cozy? A real mare can take the whole thing and get a decent meal as a reward" she said, giving a wink.

Tirek said "Phew... you're telling me, when you said that changelings can suck on other creatures to drain them I didn't realize you meant it so literally".

Chrysalis just shrugged and said "Being a parasite and being good at sex aren't mutually exclusive, I could do that at least five more times before I got tired or too full".

Cozy Glow piped up with "So sorry to butt in, but I was kind of hoping to have some fun with Tirek, I don't suppose you've got the energy for one more round do you?"

Tirek said "Ah, sure I can go one more time, Chrysalis?"

Chrysalis said "I could use the stress relief, but let's make it more interesting, I'm a changeling after all. You tell me to be somepony or somecreature if that's your thing and I will change into it, no questions asked. Though I can't promise that I'll act the same way as what I turn into, the shift is only skin deep".

Tirek and Cozy Glow shared a knowing look and a devious smile, then with a nod they turned back to Chrysalis with their request, they knew exactly what they wanted...

-15 minutes later-

"Oh yeah..." said Cozy Glow "Oh fuck yes, eat my cunt you fucking purple bitch!"

The head of "Twilight" popped and said "My goodness Cozy Glow, where did you learn such foul language? Also Tirek, do you think you could be a little more gentle back there?"

Tirek moaned as he dug his fingers into "Twilight's" hips even harder and said "No!" Then continued to rail her ass.

Cozy Glow grabbed "Twilight's" mane, pushed her face back into her pussy and yelled "Keep going! I'm so fucking close!"

Tirek, still sensitive from the blowjob, came a little earlier than he would have liked, but nevertheless kept himself firmly buried inside "Twilight" as he flooded her ass with his hot cum. It was just as Tirek was pulling out that Cozy Glow reached her own climax and squirted all over "Twilight's" face, gritting her teeth as she rode out the wave of pleasure until finally falling back in a tired sweaty heap. Tirek himself also sat down, out of breath. Green flames lit up the cave as "Twilight" transformed back into her changeling form and also decided to lie down, Tirek and Cozy had really put her through her paces.

Chrysalis said "So... does this mean we've... changed our minds about... working together to conquer Equestria?" It was a fair question, they had just spent the past few minutes fucking the living daylights out of each other. Tirek and Cozy looked at each other, then to Chrysalis, then back to each other, a moment of silence passed as they thought for a moment.

then they both simultaneously said "Nah".

The End.

Author's Note

Thank you to my wife (who has serious issues) for this story idea! I hope you enjoyed it!