Work is exhausting.

You know this, of course. It is a fact that nearly everypony knows, and has been true for all of recorded history. Doesn't matter if earth pony, pegasus, or unicorn.

Though as you've discovered, none of the three tribes have anything on alicorns. Living with Princess Twilight had proven that; the poor mare worked herself to the bone most days, trying to make life as full as possible for her new subjects. And that didn't take into account the apocalyptic monsters and ancient evils to be vanquished.

You decide here and now that you will do whatever Twilight wants tonight. She deserves it.

You find Twilight in her study, grumbling to herself as a magic-encased quill scribes furiously in her ledger, while an assortment of official-looking documents hover around her. You recognize that expression as the one where your marefriend is being fed up with political BS. She glances up from her work, briefly, then returns to it. "Oh, hey honey. How was your day?" Her words are distracted and mechanical.

You walk up to her and kiss her. "A little tired," you underplay, "but seeing you always brightens up my day."

She relaxes, her work gently floating back to her desk. "You are a hopeless flirt," she says, her tone softening, "but that's why I keep you around. Tome," she calls to her servant reshelving books, "take the rest of the night off."

The older mare bows politely at her, and looks knowingly at you. You've gained something of a reputation in the castle, but most of the staff don't bother you too much over it. They know you're the reason they got this job, and most of them seem to like you pretty well, if some of the stallions (and a couple of the mares) are a little bit jealous.

"So," you say, wrapping your arms around Twilight's waist, "what's got you so worked up?"

"Oh, just the usual mix of greed, ambition, and sycophancy," Twilight huffs. "Only now am I figuring out how much work Princess Celestia does in order to keep the nation running smoothly, and keep the... less savory elements under control. She makes it look easy."

"Well, she does have a little bit of experience in the field. But I'm sure you'll get your little ponies to see reason soon enough."

She looks at you. "I'm glad I have you. You're always there for me, even when I'm not at my best. Sometimes, you even take punches from me not meant for you."

You squeeze her tighter. "Hey, I know you need to let off steam every now and then, and you really aren't mad at me. I'm here for you, whether you need a shoulder to cry on or a punching bag."

This seems to get her thinking. "Well, there are other, more fun ways of letting off steam. And since you are willing to be my... stress relief..." She whispers her idea into your ear, and now it's your turn to blush.

"Oh, um.... That's different. I mean, I don't really think I'm into that..."

She smiles. "Relax, it will be fine. Studies show that the area is an erogenous zone that stallions find pleasure in the stimulation of. I can almost guarantee you that you'll enjoy it. I've been... taking some notes, and I think that I can emulate the technique. Besides, you've done it to me in the past."

You run your hands through your mane. In spite of your nervousness, you did decide to do whatever Twilight wanted tonight, and Twi has had a rough day. This could help her get a lot off her chest. Besides, a small part of you is... actually sort of curious. And you know Twilight wouldn't hurt you.

"Alright, you talked me into it. I'll go ahead and... clean up. But don't say I never do anything for you."

You return to the study, wearing only a towel. It is a good thing the castle's master suite bathroom comes with a bidet, as it made cleaning yourself out, as it were, a lot more convenient. As it is, you still don't believe ponies were meant to be quite this clean.

As you enter the study, you see Twilight behind her desk, her back to you. She has on a very professional- looking business suit, of all things. Well, half of a suit, actually; she is completely bottomless, and her tail is raised and twitching, showing off her lovely rump to you. She was never exactly lacking in curves department, but you've always thought that earth ponies have the best butts, and becoming an alicorn gave her the best attributes of all three tribes. Her wings hide the rest of her body from your sight, but you can see her hands moving rapidly near her waist, and she is breathing heavily.

"Having fun there, Twi?" You ask, a mischievous grin on your face as you realize what she is doing. "I am guessing that your spell worked?"

The princess slows down, turning her head back towards you. "The spell was highly successful. I am happy to report that the new appendage is fully functional, and thoroughly primed and ready for use."

"Yeah, I saw you... priming it," you snark at her.

She huffs, "I was merely applying lubricant. And then, cataloging the new sensory input the appendage provides." She turns around, and you get a firsthand look at her handiwork. She has conjured for herself a full set of cock and balls, directly over her snatch. Her shaft, or Appendage as she calls it, seems roughly the same size as yours. She must not wish to make you feel insecure; not that that's exactly a problem, since you're an earth pony, and would like to think you've got a pretty decent package. Now, though, you are slightly intimidated, as you know where the lube-coated Appendage is going.

She beckons to you, in that royal, commanding manner of hers. "Come over here, behind my desk." Her shirt beneath her dress coat is unbuttoned, giving a deep view of her cleavage.

Slowly, you do as she commands. "So that's how it is? After a rough day of politics, the overworked Princess of Harmony bends her coltfriend over her desk and sticks her magically conjured 'Appendage' up his bum? What would the tabloids say if they found out?"

She grins evilly. "That gives me an idea..." Turning you around, she bends you over her desk. With a flourish, she grabs your towel and pulls it away. You lift your tail, and Twi gives your backside a good look over. "I think you're right; earth ponies have the best butts. That's why I agreed to your first date, of course. It wasn't your personality or your looks, it was because you have a cute butt."

You chuckle. "Oh dear me, and now you have me as your personal love slave, and my butt's all yours. AHH!" You start as Twi slaps your butt. She starts massaging your rump, feeling the tight cords of muscle ripple and flex as you writhe beneath her masterful touch. Her fingers begin to make their way into your butt crack, and shivers of anticipation run down your spine as they get closer and closer to their ultimate goal.

Your breath catches its her middle finger finds its way into your plothole, curling and massaging the tight ring, trying to relax your entrance so a larger Appendage can make its way inside. "How does that feel? Are you enjoying it?" Twi asks, her voice a little nervous.

You wince. "It feels... Very weird. A little painful... But keep going..."

Her voice firm but not heartless, she keeps going slowly but surely. "We'll take it nice and slow..." She pumps in and out, and your breath shortens with each penetration. You can feel your muscles relax as your tail twitches from the stimulation. "You are enjoying this. Now, I'm going to slide another finger in..." She giggles as you moan, your back door opening wider and her fingers sliding deeper into your rectum. "And you said I make funny faces and noises when I recieve anal." She's right; compared to you right now she's positively stoic when you stick it up her butt.

"Can't help it," you whimper as she ramps up her pace and depth, "you are very, very good at this... I think, nnngh, I think I'm ready for the Appendage!"

Twilight, who has also been fondling your buttcheeks, laughs. "It's about time! Prepare your anus!" With that, you feel the round tip of the Appendage push its way into your plothole. The lubed shaft easily penetrates you, and you realize you now have a cock in your ass. Twilight Sparkle's cock, true, but still a cock nonetheless. You aren't sure how you feel about this.

Twilight obviously is quite sure how she feels about this, laughing as she starts pulling out. You moan as she says, "So this is what it feels like! Let me know when I hit your prostate." In a squeaky voice, you guide her cock to your sensitive organ. A blast of pleasure coarses through you as the Appendage presses up against it, eliciting a girly squeal from you.

"Okay, here we go!" Twi says, and grabs your hips. She starts humping you in earnest, the Appendage producing loud squelching sounds as it slides in and out of you, with excess lube trickling down your buttcrack and onto your balls. Before starting Twilight laid a soft sex towel out onto her desk so you don't get your jizz all over important government documents. Your cock stretches out beneath your stomach and rubs up against the soft towel, and you never thought it could feel this good. Twilight is humping and dominating you, and you are getting off to it.

A purple aura levitates a very official-looking scroll and a quill over your head. As you moan, she begins to write, "Dear the Count de Money... Of Prance, unnfff... Your proposal is the most revolting, unnff, that words alone cannot, unnff, describe how incensed I was at your, unnfff, mere suggestion of such a thing. In fact, unnfff, I would like you to know that, in order to properly maintain, unnfff, my composure, I, unnff, Twilight Sparkle, Crown Princess of Magic, Friendship, and, unnff, Harmony I was, unnff, forced to resort to, unnff, conjuring a phallus onto my body, unnfff, and, upon bending the Royal Consort over my desk, unnfff, and am even now repeatedly penetrating, unnfff, his anus."

"Oh crap, ohcrap ohcrap ohcrapohcrapohcrapohcrap..." As Twilight's rhetoric increases in anger, so does her pace and strength of thrusting. She plows your plot with prodigious power, the Appendage shooting through your passage like an arrow, pushing hard up against your tight walls. Your eyes rapidly alternate between squeezed shut and bulging out, and in fact the only sign that you are not in pain is the rapid twitching of your tail, which demonstrates to everypony that you are in fact enjoying this a great deal.

"Were he not so busy, unnfff, writhing in ecstasy I am certain, unnfff, he would express his, unnff, disapproval, off your selfish, unnfff, policies. Please reflect, unnfff, about how, unnfff, deplorable your idea was, unnfff, to drive a mare of such character, unnfff, as I to commit, unnfff, magically transsexual, consentual, unnfff, sodomy on, unnfff, my personal consort. Sincerely..."

She pulls the letter down, flattening it out on your back. Then she takes the quill, and signs her name, all while still humping you. "Princess Twilight Glimmer Velvet Sparkle IV, Heiress of the Grand Duchy of Ambleforth, Mistress of Magic, et cetera et cetera." With that, she puts her quill down, rolls up the scoll, seals it with her sigil, and dismisses it off to the maligned Prench count.

"Good," she says, grabbing ahold of your flanks again. "Now that that unfortunate business is concluded, unnfff I can get back to you. I would presume by your twitching, unnfff and your high-pitched and rapid moans that you are about to experience an orgasm. Now, unnfff, whenever you've given me, unnfff, anal sex, you've made sure that I've climaxed first, unnfff. And since I would really like to climax now, unnfff... It. Is. Time. For. You. To. Cum!"

With that, she wraps her hand around your tail and gives it a mighty yank, slamming balls-deep into you at the same time. You grip the edge of the desk white-knuckled, and scream as your shaft goes off like a cannon, squirting jizz all over your chest and almost to the far wall. Twilight then uses her other hand to push your back down flat against the desk, slamming you in the puddle of your own jizz. With a grunt, she thrusts once more in, and you can feel a coating of hot spunk squirt all up in your insides.

The two of you remain there like that for some time. You flat on the table, panting and twitching with each new blast of sperm that flies out of the Appendage lodged in your plothole. Twilight standing behind you, a triumphant grin on her face as she pulls your tail with one hand and pins you to her desk with the other. Eventually she sighs as the last drop of her emission is planted in you.

"Have fun?" She asks in a smarmy voice. You only manage to nod weakly in response.

That night, the two of you sleep together in Twilight's bed. Tonight you are the little spoon, with Twi draping a wing over you. She runs her muzzle through your mane, and says. "Thank you for giving me that today. I needed to blow off a lot of steam, and I got to experience a brand new form of orgasm. Well, new for me at least."

"Glad to help," you whisper back. "You'll have to write a paper on your experience," you joke, but then add, "Are you sure it was a good idea to send that to Count de Money?"

"You don't know the count, and you don't know the Prench noble court," she says bemusedly. "Trust me, he'll find it a great joke." She remains silent, then adds, "I know some stallions would not consider doing what you did... in order to defend their security in their heterosexuality."

"Well, Twi, as far as they care, I'd say I'm totally gay for your cock."

"Aww, how sweet of you," she says, kissing the back of your neck. "Although that gives me more ideas..."

You start to sweat, a bit nervous, then feel a familiar pressure. "Umm, Twi?"

"Yes, honey?"

"You still have the Appendage, don't you?"

"Mmm-hmmph."

"And you're sticking it up my butt, aren't you?"

She wraps an arm around you and pulls you in tight, further impaling you on her. "Mmm-hmmph!"

Author's Notes:

I had a second idea for the bit with the letter, which I might add as a "Part 1B" later, having it as another round with a different outcome. In the meantime, next episode, reverse futanari!