Adventures of a Small Stallion

You just can't stop yourself anymore.

Only now, too late to stop it, do you realize that your sexual appetite has been growing with each ejaculation. You've become unable to keep yourself from sex. You have to find someone else to satiate your hunger now, but there don't seem to be any other mares who attract your interest.

None but one. You don't know why, but a particular unicorn is your primary focus. Everypony else would just have to wait.

You fly as fast as you can to the Library. Hopefully by now it will have emptied out and become far more accessible. As you fly, you can feel yourself rising a the mere thought of sex with her, though you can't seem to figure out why.

The Library is only a quarter mile away now. You can see the ponies leaving the giant tree as you approach, the amber light radiating out of the door and windows indicating the coming dusk.

You fly up against a window, eagerly humping the glass as your libido gets the best of you. You can see Twilight in the upper area of the library, preparing to turn in for the night. She was levitating some weird books back onto the shelves and saying something to herself, though you can't make out what.

~-~-~-~

Twilight, for her part, was exhausted. After all the commotion from last night, she had just wanted today to be over as quickly as possible. Then there was that business with Pinkie, who had told her to lock herself in to protect herself from the 'emergency threat' that was coming. Despite her skepticism, she knew Pinkie too well to ignore her advice, and decided to leave Spike in charge of the library for the day, allowing her paranoia to get the best of her. She hoped it wasn't too much for the poor baby dragon to handle.

At least the time alone had given her an opportunity to study a few spells, especially one that she had been having trouble with. The transformation spell, designed to not change a pony's appearance, but instead their physical attributes (height, weight, etc.), had gone haywire when she had tried to test it last night. Maybe trying to balance it out with a sexual potency spell WASN'T the best idea, but it seemed that way at the time. The mixture of the counter-balanced spell frequencies was supposed to make the first spell stable and negate the effects of the other, but even a minor mistake could throw the spells out of whack, leaving the target in instability (and strangely, with an insatiable sex drive) before it exploded. Violently. The spell she had fired off last night had gone crazy and flown out the window, so there must have been more to it.

Twilight yawned and decided that this was a theory for another day. She put up the last book and climbed the stairs to her bed, plopping onto the mattress. She blew out her candle and was fast asleep withing minutes. Spike had left earlier, deciding to help Rarity get her favorite supplies together for her and Fluttershy's spa trip, and had spent the night at the Carousel Boutique to watch Sweetie Belle while Rarity was gone, leaving Twilight utterly alone.

~-~-~-~

You fly up to the top of the tree, forcing your way through the leaves and branches forming the roof to fly in through the chimney. You get in just as the last pony is leaving for the day, and you hear the door shut.

Showtime.

However, as you dart upstairs, the scenery around you seems to shrink, if only a little. You stop, realizing that, to your dismay, the spell that apparently caused all this was starting to wear off! Fortunately, it seemed to take a while in between growth spurts, so you had at least a half hour left to finish out the day with a bang.

You fly even faster, and before you know it, you're hovering over the bed of a sleeping Twilight. She looks so adorable, snoring so lightly with her mane slightly ruffled, that you almost reconsider what you're about to do. Almost.

You fly down to her hind legs, conveniently situated above the bed covers, and get to work. You waste no time in licking up and down her slit, getting her wet as fast as you can. You hear some grunts and see Twilight's face squirm, a telltale sign of her arousal. Her sopping cock sock is soon dripping wet, and as soon as you have enough lube, you thrust into her at full speed.

Twilight lets out a quiet gasp when you penetrate. She brings her legs closer together, unintentionally pushing you in even further. You pull out almost completely, then thrust back in, all semblance of control lost. You buck like a wild animal, attempting to get yourself off as quickly as possible.

After about five minutes of thrusting, you finally feel your climax coming. You shoot your seed into Twilight's flower pot, utterly satisfied. After cumming, however, you feel yourself begin to jump up another foot in height. Apparently, climaxing only sped up the process.... as well as renewing your sex drive. Your cock, still stuck in Twilight's cooch, begins to grow back to normal size as well, filling her up with even more of your meat. She begins panting harder, and it's apparent that the size is getting to her. You begin to thrust again, bucking wildly into her depths.

You climax once more, shooting thick, ropy strands of cum into her womb, and shoot up another foot. Your meaty popsicle grows even more inside her snake sock, now filling her six inches in. Twilight groans as your cock grows, a blush apparent on her sleeping face. As you thrust again, however, her eyes shoot open.

She looks down to see you, a stallion now the size of a growing colt, thrusting away at her.

"AHHHH!" Was her first reaction, of course. "AH! AH! W-WAIT! STOP! AH!" She could barely get a word in between thrusts. You continued to buck away, ignoring her pleas. "P-P-PLE-E-E-E-EASEEE STOP MOVING!! STOOOOP!!" She tries to push you away with her hooves, but you ignore it. As you pound into her, you can feel your balls churning again, and you explode into her as her tightening, trembling trench hugs your third leg.

"Wha? No! N-NO, WAIT!! DON'T DO IT IN ME!!! DON'T-AHHHHHHHHH!!!" She's cut off as a wave of pleasure washes over her when your cock grows another few inches. Soon enough, after a few more climaxes, you're back to full size, screwing Twilight's brains out.

"AHHHH!! AGGGHAAAHH!! AHGGAAAHAHAHHAAAA!!!!" She can barely get words out anymore. Her face is a much deeper shade of beet red than that of her friends. Her horn begins glowing brightly, something that you hadn't seen with Rarity, but maybe you just weren't looking. She brings her head back as her back arches, surrendering herself to the throws of orgasm. Her tongue hangs limply out of her mouth, and her eyes are glassy and rolled back. She pants and gasps for air, only to be met with harder and stronger thrusts.

You continue on, the cycle of thrusts and orgasm becoming routine. For the next hour, you leave her stuck in a minlss state of sexual gratification, her gasps and pants becoming almost inaudible in comparison to her groans and screams. She can't take much more.

After a long, long session of sex, you hit the edge one final time, the most powerful orgasm so far. As you finally pull out, she grunts and gasps as you leaves her body. Her vagina pours out copious amounts of both your cum and hers.

Twilight is a wreck. Her back is stuck in an arch, and her hindlegs are holding her quivering cooch up in the air as it pours out pint after pint of ejaculate. Her head is pulled back, face buried in a pillow, and her forelegs are holding herself up as she basks in the afterglow of her multiple orgasms.

You poke her with your hoof. She immediately begins to convulse, and she seems to scream and groan without any sound. A gallon of more cum flows out of her crotch as she shivers. She has become so sensitive that a slight touch could knock her over the edge again.

Finally satisfied, you climb out the window and begin to fly home. Suddenly, a strange feeling overtakes you. You feel a rumbling sensation within your gut. You pause in midair, now just outside your home. In the cool night air, your skin and coat feel warmer than usual. The rumbling gets stronger. You can feel something rising, something that isn't your prick, and it's getting stronger every second. You open your mouth and stretch your limbs as far as you can....

And then you proceed to let out a massive, disgusting belch. That really did feel nice. For a moment, you felt like you were going to explode or something.

You then scratch yourself lewdly and fly in the window. You lay down on your bed, once again familiar to you at normal size. You close your eyes and drift off to sleep, the cool night air flowing into your room through the open window.

All in all, a pretty nice day.