"Wow, that was a good dinner," you say, as you walk down the glittery halls of Harmony Castle. The sound of your hoofsteps echo along with another, slightly lighter pair.

"Oh, there's no question," Twilight Sparkle, Princess of Magic and Harmony and the lady of this castle, says as she walks beside you. "Apple Streusel is one of the best gourmet chefs in central Equestria. Hiring him was a no-brainer, once we got him convinced to come."

"Sure, that must've taken some work," you say, jokingly.

"Surprisingly, it was. Make no mistake, he was flattered by the invitation to work for royalty. But he was very happy with his previous job. It took Applejack to convince him that this was the right career move for him." She turns, and smiles at you, that soft beam that always melts your heart. "Thank you for convincing me to hire staff for this place. It doesn't seem so... empty anymore." She takes your hand, and squeezes it.

"It's not a... you're welcome," you say, tripping over your words. Twilight has a way of doing that to you. "I know you've had... reservations about this whole... 'royalty' business, and that some of these changes have seemed abrupt. Especially after... the tree house."

When the two of you had first moved into the castle, Twilight was more than a little reluctant to hire servants to maintain the place. "I'm just a normal mare!" she had said. "I don't need ponies around me all day, bowing and scraping, and catering to my every whim." You'd pointed out to her that it was physically impossible for the two of you plus Spike to keep up such a large structure. It took one whole, exhausting month for her to relent.

You tug at the collar of your tuxedo. Wearing the thing to every meal was taking some getting used to, but that's the price of dating royalty, and Twilight's worth every sacrifice you've given. The mare herself is looking as stunning as ever in the evening gown Lady Rarity designed for her. The Knights of Harmony, as Twilight's closest friends are now called, have had their own changes to get used to. Rarity's probably taking to it the best, though Rainbow Dash had a custom set of crystal armor and a sword commissioned.

Twilight seems to notice this. "Let's get you out of those clothes then, shall we?" she says in a sultry manner you'd never thought you'd hear from her, and gazes at you with half-lidded eyes. You immediately feel your pants tighten. "Your room, or mine?"

"You've got the nicest bed in the house," you say back, trying to sound sexy. You don't know if you succeed, but judging by the way Twilight's looking at you, she doesn't care. The two of you head for the royal bedchambers and lock the door.

"I'll be just a moment," Twilight says, and steps behind a privacy partition. You're sure she's changing into one of those sets of lingerie that drive you wild. As you remove your own clothes, she says, "You know... I've been thinking..." She sounds a little hesitant. "We've been together for some time, and have... slept together for a while now. And I've found a great deal of enjoyment from it, not saying I haven't, but..."

Based on her nervousness, you deduce her meaning. "You want to experiment?" As you think about that, several ideas run through your head, some more appealing to you at this moment than others. "What were you thinking?"

"Well, we haven't involved magic much in our sex. I mean, aside from the hornjobs you've given me, which by the way, you're very good at." You can hear the blush in her voice. "And well, there have been times that, while studying up on a new spell, I couldn't help but think of some... carnal uses for them."

As an earth pony, the thought of combining magic and sex has not really occurred to you, but knowing your marefriend's proficiency in both, the thought is... very arousing. You strip down to your boxers, and say, "Well, that sounds... interesting. As long as we take it slow, I guess."

"Quite right," Twi says, finishing up. "Tonight, I will keep it very simple. A single spell." She steps out, wearing possibly your favorite piece; a silk camisole and panties with stockings, and a mesh thing around her horn that Rarity designed. The entire set has a purple color scheme that accentuates and highlights her body. Her tail swishes erotically behind her, and her wings flare out in the classic pegasus show of interest, the infamous "wing-boner." You are the only pony whose ever seen her with one; it would be most undignified on a princess.

"Lie down," she orders, and you comply. Perhaps not surprisingly, she tends to be the dominant one in the bedroom, speaking with the charismatic authority that earned her the respect of many. You can't help but be inspired to be eager to please her when she speaks in that voice.

She crawls up over you on the bed, her wingspan shadowing you like a lavender canopy. She runs a finger down your chest, over your abdomen, gently caressing you, and then hooks your waistband and pulls off your boxers. Your cock and balls are now full in view.

"Now, for tonight," she says, gently caressing your shaft, "I am going to use a growth spell on this."

"You're going to... make my dong expand?" you ask, blinking.

She nods. "Indeed, that is, if you want." She looks puzzled, then an expression of dawning realization and concern covers her face. "Oh no, I didn't mean to imply... that is, I just thought- Look, I'm not saying it isn't big enough as it is, I really think you're.... I've gone and killed it, haven't I?"

You shake your head. "Not entirely. I'm not that insecure, I know you didn't mean anything by it. Besides, the other night, I think you made pretty clear that this," you point to your erection, "was more than adequate."

She blushes. "Yeah, you do know how to satisfy when you want to..." she whispers, then regains her confidence. "Well, now that that embarrassment is handled, shall we get on with it?"

"By all means, fire away," you say, reclining. You are a little excited, but not very nervous. You trust Twilight implicitly.

The alicorn dips her head, staring at your shaft, and a lavender aura encases her horn. A beam of swirling purple light descends, and envelopes your shaft. Your breath catches. "Twilight... that feels... good..." You hiss, and your back arches as your cock is subjected to your marefriend's careful magical ministrations.

As you watch, your girth begins to grow, slowly becoming longer and wider. Your face breaks into a grin as you realize that the larger your shaft grows, the more pleasure you can feel from it. Twilight is currently in a deep state of concentration, sweat running down her brow.

Suddenly, her horn fizzles, and you feel a spike of electricity jolt from your cock, up your spine, causing your eyes to snap shut. "Oops," Twilight says, and you slowly open your eyes, now very worried.

You gawk at what lies between your legs. Your shaft is now... at least six feet tall, and a foot wide, poking through the canopy of the bed. "I guess... I got a little distracted," Twilight says sheepishly.

"No kidding..." you say as you look at your new monster schlong. "I can't move with this thing. I'm a freaking tree. Tell me you can reverse this."

"Of course I can," she says, but still stares at your member. "But, I think that I can... yes... do you mind if I play with it?" She licks her lips.

You nod, but aren't entirely sure what her plan is. She levitates you onto the floor, on a rug near a magical fireplace. Then, she walks over to your girth, and begins running her hands over it. "It's like a tree. A big, veiny, throbbing, hot tree..." She begins rubbing her body against it, purring. You find yourself panting as she sashays around it, hugging it close to her. She begins kissing it, sending shivers up your spine.

With a flick of her fingers, she drops her camisole. Her breasts are not quite the largest you've ever seen, but they're certainly big enough, with exactly the right mix of perkiness, bounce, and softness. You could squeeze them, tweak them, suck them, motorboat them, or boob-fuck them all day long. Of course, right now, you're stuck to just looking at them, but they're pretty enough.

She begins sliding her headlights up and down over the side of your shlong, her erect nips pushing into your thin, sensitive skin. "Oh, baby, you're so hot," she says breathily, "this is the best decision I've ever made..." You are in no position to argue.

She drops her panties, and wraps one leg around your shaft. You can feel the wet lips of her snatch rub up against you, finding one particularly large and throbbing vein. You wonder if you'll get her off with just your pulse alone; based on the way she's panting, moaning, and grinding her marehood into your vein it is an entire possibility.

Twilight then looks at you. "Enjoying this as much as I am?" she asks, and you nod emphatically. She then wraps her other leg around you, and starts climbing. You are thankful this room has a large vaulted ceiling. She eventually gets to your head, which by now is oozing with precum. She wraps both legs around the base of your head, finds a good vein to fix her marehood to, and starts licking at the tip.

She looks down at you. "Do you think you would like it if I... kissed your urethral meatus?"

You look up at her, puzzled. "My what?" You hate it when she uses scientific terms in the middle of sex; on more than one occasion, it's derailed the whole thing and put her into lecture mode. And at this stage, she could get hurt if you were to suddenly lose your excitement.

"You know, your, erm, hole."

"Oh. Right, um, go ahead and try. Just don't go too deep."

Twilight begins kissing your shaft's exit. She alternates between moaning and making slurping sounds, while her hands vigorously run over your head, and her crotch grinds into your vein. You feel her tail swishing rapidly over you. You groan repeatedly at this attention, grateful to the heavens for giving you a marefriend like Twilight.

You can hear Twi's moans getting higher in pitch, and her hips are moving faster and more erratically. She's approaching her climax, you realize to your relief. Pressure's been building at the base of your shaft for a while now, and you didn't want to finish before her.

That is no longer a worry.

"Honey, I'm cumming!!!~" Twilight moans, and you feel warm, sticky juices flow out of her. She grips tightly to your monster shaft, and slides down it, letting go with her arms and leaning her torso back. You can feel her round, perky buttcheeks rubbing against the skin of your monster dong.

Something crosses your mind, too late. Far too late.

"Twilight, when I cum I'm gonna uuurrrggh!!!~" And thus you erupt like a volcano.

Water splashes as you wring out the last of the mop. You look around to make sure the last of your jizz has been mopped off the floor. "I'm sorry again about the mess," you say.

Twilight hovers just below the ceiling with a sponge of her own. "It's alright. Like you always say, sex is messy. Besides, I should've realized it would happen myself." She gets that cute, academical look on her face. "Note to self: Magically increasing the size of genitalia leads to proportionally increased size of emission."

You chuckle. "Yeah, before we do this again, let's make sure we don't end up spending our afterglow cleaning up the mess."

She giggles, then lands in front of you, smiling. "It was fun, though," she says, and kisses you.