It was early evening by the time I arrived back at Ponyville Castle. I looked all over the castle and did not find Twilight, so I went to her magic lab.

I opened the door quietly, not to disturb any ongoing incantations.

“Um, bad news dear.”

“I know, I got a message while you were still on your way to the station. It’ll be okay, don’t worry.” She kissed my nose. “Now take a look at what I’ve been working on!”

Twilight stood before an intricate tracing on the floor of her spellcasting area. The network of lines was complex but certain generative themes were recognizable.

“It’s a gender-reversal spell?” I asked, “Some kind of a magical equivalent to the Hofstadter pervert-o-ray?”

“Pervert-o-whatsit? I’ve practiced on enough small animals that things are getting really weird at Fluttershy’s cottage, but I think I’m ready to do this for real.”

Opposite the two great lobes of the diagram, Twilight closed the last gap in the convoluted outline.

“Hey, Tangent, do you know what we call this geometric figure in the trade?”

In sea of curves, she pointed at the spot where the only two straight lines met, perpendicular. I couldn't think of a term specific to that type of orthogonality, perhaps Equestrian magic had specialized vocabulary to accurately describe every jot and tittle of a magic circle – or any other casting figure the art could devise.

“No guess?” she asked. “C’mon, it’s a rite angle!”

“Ugh,” I groaned, “I should have got that.”

“I thought of that one myself!” Twilight glowed with pride – by Mother Frigga I love that dork. “Let’s give this a try before we run out of time!”

“Shouldn’t we spend what time we have trying to convince her Highness not to banish me? I thought if you plead my case she might—”

“She’ll come around after a few days once I can meet with her, without you here to cause more incidents. She never freaks out over little pranks like this, so I’m sure I can talk her down. In the mean time we’ll have a bit of fun.” Her eyes, dare I say, sparkled.

I bowed low to my Princess. “I’m willing to try anything for you, love.” I stepped into the diagram, where she indicated. “I was only trying to help entertain everypony.”

“With me,” she corrected and stepped into the working at my side. “I’m not equipping you with a pussy unless I have a cock of my own nearby to fill it.” Her smile was mischief, a bit of lust, and pure love.

I didn’t fully grasp the intricacies of her spell, but I could appreciate the effort that must have gone into it. A nudge here, a little more power there, and the results ought to be a little more… just more …while still leaving my abilities, and contribution to the effort, discreetly out of sight. Silently I added my magic to the equation, trusting that one way or another Twilight and I would have a wild time.

Twilight stood with me and activated her waiting spell. Energy flowed, secret glyphs lit up in non-space outside the astral plane. Sections of the spell shifted, the diagram on the floor spun around us, this was a major casting and I was having doubts about my improvements; nothing was going to go wrong, but it might work too well. I don’t think Twilight could even see some of the parts of the spell. How much power is too much? The problem, I decided as a tingling began in my groin, is that I had interpreted the spell in in terms of change rather than exchange. We were going to come out of this as unusually refined sexual archetypes. Avatars, if you will, of male and female lust. Thank Celestia that our fearsome lusts were already strongly focused on each other and would not be running amok.

There was an utterly impossible sensation: something felt very, very, different at the aft end of my body.

And then we stood blinking as the diagram faded from the floor, consumed by the spellwork.

“Yay! The spell worked!” Twilight grinned at her success. She pranced around me looking at the changes in my body from all sides, as I admired hers. Her step had grown more solid, her shoulders were broader and stronger. She nosed my tail aside and kissed. My brain turned to mush, overwhelmed by new feelings, sensations originating in body parts that had not existed moments before. I wanted to see the changes to Twilight’s body.

“Cock?” I asked.

She reared, balanced a moment en rampant to give me a good look at her new equipment: slung beneath her like a finely tuned instrument of pleasure, tip emerging from its sheath. Nice. I needed it, now.

“Cock.”

“Yep, right here!” she grinned and shook her newly firm and muscular ass, and caused her cock to sway beneath her belly.

“Cock.”

“Um, uh huh, yeah! Do you like it? I think you like it, you’re staring! Wipe your chin.”

“Cock.”

“…”

“Cock.”

“Some kind of transformation induced brain aneurysm?” She raised an eyebrow, the smug look of a moment ago replaced with perplexure.

“Cock.”

I shook myself.

“Sorry, Twilight, that spell. I don’t just have female body parts, I think I have female sex instincts right now and I’ve never been a girl before I don’t know how to reign them in and they are fired up ready to go. I can hardly think. If I was not already totally confident of our love I would be terrified of the amount of lust I feel right now. If I was with any other stallion but you I don’t know if I could control myself, not that I think I can control myself around you and I certainly don’t want to anyway because I love you and I know you love me and this is all new and I can’t think and I am blathering now and if you don’t stop me—”

She did stop me, with a kiss.

“Yeah,” she said after a couple minutes of kissing. She was a little breathless, but happy and reasonable. “This… I’m not going to say the word and get you started again …organ of mine that has your attention also seems to have a direct high priority channel into my brain. We’re talking deep inside circle zero. I wanted to take you somewhere quiet and sedately romance you to make up for our little tiff the other day,” she spoke with a cheerful matter-of-fact tone, “but I think we need to take care of this right bucking now. Preferably not in a laboratory full of delicate equipment and dangerous reagents…”

Pop.

We were in her bedroom.

“Prithee, good stallion,” I adopted florid overwrought formality to recover from my lapse a moment ago, “do pardon my unseemly fixation ‘pon thy mighty rod. But in all good sooth–” Twilight stopped my silly posturing – this time instead of a kiss I was silenced by a cock in my mouth. Twilight’s cock. Cock. Cock. Mmmmm.

I sucked enthusiastically. Twilight did not seem to mind that this was my first real-life awake real experience giving head – I must have learned something from going down on Leon in sexy dreams. Certainly, if there was one thing I learned from him it was that taking too much and gagging is mega-un-sexy. I cautiously started myself with only half of Twilight’s rigid length in spite of my instincts demanding that I impale my throat fully upon her. She gently ran her hoof down the side of my face and let me control the depth and speed. Careful not to trigger mood-spoiling respiratory paroxysms I worked my way slowly deeper, stroke after stroke.

There was no distinct moment of inevitability but if Twilight had come right then I would have climaxed too.

“Oh, Celestia!” she exclaimed after a few more delicious minutes, “now I understand why you’re always trying to hump my face!”

“mmmm mmmmm’t,” I tried to say. It wasn’t easy to enunciate because, you know, cock. In my mouth.

“Kidding!” laughed Twilight, “you,” she pulled her cock out of my mouth and turned to kiss the side of my muzzle, “have always been,” she kissed the other side, “a complete and total gentlepony about getting your dick in my mouth,” she placed a gentle smooch on my lips, “and I truly appreciate that. More than ever now that I understand how good it feels.” Another smooch.

“Twilight.” I was cross-eyed with desire. “You can come in my mouth. If you want. Um, please?”

“Oh honey. I am going to ride your face all the way to the Whinny City. But not right now. Right now I think we both need an old fashioned game of ‘stick the outie in the innie’. We’ll get fancy later. I’ll make a trebbelgänger spell that will fill you up so full…”

“Dreifachgänger…” I mumbled the correction as I flagged my tail.

Twilight mounted but did not enter me. She pressed the head of her cock against me, nestled just the tip between my outer labia and stopped.

“Do you wa-a-a-ant it?” she teased.

Did I ever.

“Ohhhhnggg, yes, yes, yes, yes, yes, yes,” I panted.

She pulled back so her dick was no longer touching me.

“Tell me.”

“Twilight, my true love, my prince of friendship, I am begging you, please. I want it.”

She rocked her hips forward, lowering her cock head aching millimeters further away from my need. Left, right, left, right she gently slapped her hardness against my inner thighs. I lowered my head so I could look between my fore-legs, under my body, to stare. The sight was hypnotic.

“The bare pronoun ‘it’ lacks the high degree of lexical specificity which I have grown to expect from you, dearlove,” she said, and gently nibbled my shoulder. “Tell me. Exactly. What. You. Want.”

Author's Note

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Nah, I’m just being silly. Is anypony there?