Have you ever let your curiosity get the better of you? Found that one thing you couldn't say no to, no matter how many times you turned away? Only to have that last bit of will power crack and give in, only to find yourself wanting more? Well that's kind of the situation I'm in now.

My name is Dusk Shine, the apprentice to Princess Celestia and recently ascended Alicorn. I'm socially awkward, a complete bookworm and utter nerd - or egghead as some of my friends like to call me. Heck I could list off my hobbies on one hand, but that isn't my problem.

You see I messed with something I shouldn't, a simple magic spell; an enchantment to be more precise I was working on and to be fair it worked...only too well. I-I didn't mean to I though if could pull off Starswirl's unfinished spell then I could do this on my own. I'm paying the price for my mistake now, and ever since then the changes come at random I still haven't worked out what brings it on, but each time...I lose myself.

I can't help it, it just feels so good...which I'm ashamed to admit, and each time the transformation last just that little bit longer. Right now it's about the point where I stay like that for nearly a full day from what originally was only a couple of hours...and worst of it all...I love every moment of it, who I become...I crave the change, I'm addicted to it, and I find myself wanting it more and more when I turn back...

A week ago...

"Dusk?" Spike a small purple dragon called out to the basement, "Are you okay down there?"

"I'm fine Spike!" I called out, "I'm just working on perfecting this spell..." I trailed off, "Now where was I? Sugar, spice..." I fingered through my formula, "This spell needs the perfect catalyst to make it work." I muttered to myself, "A dash of powdered desire, a sprinkling of crystallized lust, and a drop of liquid courage." I smiled in satisfaction as I mixed the ingredients, it was a pain to get a hold of these ingredients, a little prodding here and there in the right places allowed me to get these extremely rare ingredients.It was wasn’t easy however physically going out of my way to actually gathering the ingredients, Zecora thankfully was kind enough to point me in the right direction where to find them and also in showing me how to distill and prepare the herbs properly.

I made sure I used the exact measurements for this catalyst, sometimes it was good to be a perfectionist. I only had one shot at making it work, the herbs I used only grow once every fifty years.

The catalyst glowed a faint pink, as it solidified into a crystal. Part of me wanted to laugh like a madman.

"Perfect..." I grinned in satisfaction, "This will be it...the perfect blend of Alchemy and Magic." I made sure to be cautious, following every rule of magic and alchemy to the letter. I didn't want to explain to Celestia why my home was nothing but a crater should anything go wrong..

Learning a spell was one thing...but creating one? Oh that was something for the masters, a rite of passage of all of Celestia's personal students.

The spell in question was simple...I must admit the reason why I created it was completely and utterly selfish. It would allow someone so awkward and shy like myself to be more confident, and finally overcome my crippling shyness. It sounds so cliche right? Typical for someone like geeky old me.

Everything was going perfectly, the crystal was done at last and I was about to place it in the center of a pedestal. Unfortunately according to Derpy's law - as Rainbow Dash puts it - if it can fuck up...it can and will in the biggest possible way.

I must have lost track of time, as I worked into the night creating the crystal and I didn't realize the moon was out shine it's rays right on the crystal I was holding...this wasn’t good the light of the moon was the next part in creating my enchantment, and I needed it to make the enchantment a permanent one.

The moonlight crept towards the catalyst at a frightening pace. There was nothing I could do, how could have I been so foolish to get so wrapped up in my work! I got so caught up trying to get everything done properly, my own perfectionism was going to be my works undoing and there was nothing I could do to stop the moonlight hitting the crystal!

"No, no, no, no!!" I panicked as the moonlight radiated through the lavender crystal. "Not now...not like this! It's not ready yet!" I spoke to soon as the crystal shattered and exploded in a blinding lavender light. I was overwhelmed by the force of the magic exploding from the heart of the crystal, and thrown across the room like I was backhanded by an enraged Manticore. I felt nothing but blinding pain, as I hit my head against the bookcase behind me.

"Dusk..." A familiar voice echoed through my head, "Hey you okay bro?"

"Urgh...keep it down Spike." I groaned as I sat up still feeling dizzy, "Ooh my head feels like I just tried to headbutt Rainbow Dash head on during a Sonic Rainboom."

"Jeez Dusk." Spike sighed in relief, "You had me worried there, I came running when I heard the explosion. You sure you’re okay? You look like you hit your head pretty hard."

"Explosion?" I asked wincing a little, and took a look around...the lab was a wreck, I must have been blown back in the explosion..."Oh no..." I looked at where the crystal should have been...only to find it nothing more than lavender coloured dust. I knelt down and picked some of it up, only to have it slip through my fingers like grains of sand. "Dammit!" I punched the ground out of frustration, "I've working on that for months! All that work and preparation ruined!"

"Dusk...I," Spike tried to reassure me, "Your notes are still here, you can just recreate it right?"

"..." I didn't answer, "The ingredients I needed are extremely rare Spike, they'll only grow once every fifty years. I practically bend over backwards to get a hold of them."

"Hey, I'm sorry about this man." Spike replied, "Surely you can come up with something else right?"

"..." He was right I could, after all I was Celestia's personal student right? This was nothing but a minor setback.

After a few hours of moping, reviewing my notes and wondering what went wrong I decided to retire to bed, it was two in the morning after all. I was tired, angry, frustrated and I just wanted to sleep this failure away. I was unaware at the time that my spell had succeeded...just not in the way I expected it to.

Spike was sleeping in his own room and thankfully couldn't hear me tossing and turning in my sleep. I was thankful he was such a heavy sleeper, the world could end and he wouldn't hear it.

Something seemed to be determined not to allow me to sleep, as I tossed and turned. I lay awake, wondering what would Celestia's reaction to this would be...she would probably scold and punish me for doing this under her nose. I'd be an embarrassment to her, I dreaded what Luna would say if she saw me now...

I looked out the window, it was a full moon tonight. I bemoaned the fact that I had missed timed such a perfect opportunity for completing my enchantment. I know it was Luna’s duty to raise the moon each night, so I couldn’t blame nor be angry at her for doing so. I don’t think I could bring myself to be angry at her anyway. I can’t even look at her without my heart skipping a beat, the way her baby blues shone with happiness when I saw her...

I could feel a slow rising warmth coming from within me. It felt rather pleasant if I had to describe it to anypony. My breathing was getting a little ragged, I couldn’t think clearly on anything but that wonderful rising warmth. My heart was pounding, why did this feel so good.

I felt hot all over,like somepony had lit me on fire. By Celestia I was practically radiating heat. I could feel something building up through out my body, starting from my stomach. It was drowning me in a sinfully pleasant feeling that washed me from head to toe, you know the kind of feeling you could get addicted to...

I’ve never felt better in all my life. By the stars you could get drunk off of this...I-I wanted more...I needed more...I craved it.

"H-Haahh!" I let out a low moan, "O-ooh!! W-What's unnfff...g-going on!! I-I...f-feel so good!"

I could feel my body change...getting smaller and thinner, or rather slender would be the best term. My chest was getting tighter little by little, something was retreating, regressing between my legs and I couldn't help myself and reach down into my boxers...only to find nothing there, only to be replaced by something moist in it's place. I couldn't resist rubbing my new sensitive marehood, partly out of curiosity and just how much that pleasant heat intensified when I did.

“...T-this feels...s-so good!” I panted and groaned,”...m-more...I-I want...m-more!!” I couldn’t help but let out a low groan in my lustful daze.

My heart was racing at this new sensation, it was overwhelming my very being with sheer utter bliss with each caress. I was working myself up into a frenzy, driving myself deeper into this feeling of lust and desire.

Something inside me told me I didn't even care my stallionhood was replaced by a now wet pussy that it felt too good touch and rub I couldn't bring myself to care. I didn't need it, or want it for that matter, it was almost like it felt natural for me not to have it.

"Oh by the stars..." I pounded the mattress, trying my best not to scream the place down at the sheer bliss I was going through. I gritted my teeth, watching my usually short hair lengthen in the corner of my eyes. I could hear something rip and tear. The seams of my boxers giving way to my widening hips and growing plush backside slowly filling out, getting plumper and fuller. Each little pulse of growth giving of such a heavenly shock throughout my body.

“Oooooooohhhhh...fffffuuuccckk!!!”I groaned out,“FuckfuckfuckFUCK!!!”

I could feel my t-shirt tighten against my chest until the point all I wanted to do was tear my shirt off and grope and fondle my new found swelling chest, each caress and grope seemingly urging on the growth. I lost myself in how sensitive and soft they were, part of me was hoping I would stay like this and never change back. My heart raced at the thought...of being stuck like this forever, never going back...

"Nngghhh!!!" I moaned rubbing my clit harder, "I'm gonna..." I could faintly tell the pitch of my voice soften, sounding more feminine than it should, "I'm gonna..." My waist narrowed, and everything else just seemed to be snapping into place. "I'm gonna...!!" In one final burst of utterly heavenly and blissful heat, I let out one final orgasmic scream...

"Holy fuck..." I panted trying to get my breath back. "That felt amazing..." I stood up, looking around a bit and stretching. What amazed me is vision of beauty that greeted me in the mirror.

"I'd bet if any-pony saw me now they'd probably fuck me silly." I grinned, once I saw my reflection. I felt so confident, and so desirable. "Hmm now that's not a bad Idea actually." I froze...did I just really say that?

I took a moment to look at me body. My mane and tail were the same colour and so as my lavender fur. I was noticeably smaller in terms of muscle mass, but that loss seemed to have gone to my hips, thighs and plump squeezable ass. I made sure to give my ass a nice squeeze just to make sure I wasn't having a very wonderful dream. I couldn't help but let out a confident chuckle once I realized how big my chest was, while I'm sure Fluttershy and Pinkie Pie were much, much larger I was confident I could make Rarity a little jealous.

I casually tossed the remains of my shirt and boxers to the side, and further examined my body.

"Fuck I could give Cadance a run for her money." I muttered to myself, taking in my new softer facial features. My lips looked a tiny bit fuller, and my eyes seemed to sparkle with a hint of playfulness.

"Oh...fancy having a taste yourself Duskie?" A stray thought came to mind, "Or are you after that hunky brother of ours, or how about Dashie, you know she swings that way right? Better yet how about shy and meek little Flutters? I'd bet you'd love to make her squeal, you know fine well what they say about the shy ones."

"Hmm that does sound...wait what!?" I wondered aloud where that thought came from. I shook my head trying to set my mind straight.

"Aw don't be such a spoil sport Duskie..." Another stray thought, "What about letting me have some fun huh?" The thought seemed to whisper into my mind, "Isn't that what you want Duskie? All those smarts of ours, and you can't even bring yourself to let loose once in a while. Why don't you just let little old me have some fun like you've always wanted to."

I could feel myself blacking out, something else seemed to be in control now...and I couldn't or rather didn't want to resist it...all those sweet nothings and promises being whispered into my ear...

"Aw don't worry Duskie..." I grinned, "I think it's about time I had some fun for once...I might want to 'change' a few things first." I readied an alteration spell on my clothes, but I changed my mind as I had something more naughtier in mind.

The princess of the night, Luna was making her way back to her room tiredness setting in from the early morning hours. She let out a yawn as she entered her own personal private chambers.

Luna was frankly lack for a better word was frustrated at her sister's attitude. She couldn't understand why Celestia kept her away from her prized student Dusk Shine. If it wasn't for him and his female friends then she'd still be stuck as that monster Nightmare Moon.

Celestia had some nerve invading her own personal dreams...that was her territory. Luna couldn't deny that thought of in her sisters own words "Giving him the ride of a life time" appealed to her.

"Curse that sister of ours." She muttered under her breath, "How were we to know she saw him like her own son."

"Oh c'mon now Lulu." A very feminine voice asked, Luna looked toward the source...a vaguely familiar lavender alicorn sat fully nude on the balcony rail just outside. Luna knew she's seen her somewhere before but where...

"W-who...are you?!" Luna asked, blushing slightly at nakedness of the mare in front of her.

"Mmm..." I leaned forward pushing my breasts together in a mockery of a thoughtful pose, "A tease maybe? Can't you blame me, I mean wow...look at you. I bet you get all the mares and stallions." I giggled a little.

"I-I asked who are you?" Luna warned trying to hide her own blush. "A-answer me at once!"

"If you must know..." I got up stretching and spreading my wings, "The name's Twilight...Twilight Sparkle kind of fitting considering the time don’t you think?" I walked towards her, a full sway in my step. Luna backed away until I had her back to the wall my breasts pushing up against her own well endowed chest. "And you...my dear Luna, look good enough to eat!" Luna's blush intensified a thousand fold, "Or would you like me to find out how many licks it takes, hmm?"

"B-back off at once this instance!" Luna stuttered, "Or would you rather find yourself in the dungeon!"

"Oooh you kinky thing!" I replied, "Do you want me that badly? All to yourself, to be the one in control or would you rather watch while your guards have they're nasty way with me?" I slid my hand down her toned stomach and further down between her legs.

"Ahnnn...W-what are you..." Luna let out a cute squeal, "D-desist this at once!!"

"Aw c'mon now Lulu." I teased, whispering into her ear "I came all this way just for you...y'know...don't you want me coming for you?" I let out a husky chuckle, “I’m not so bad Lulu, unless you want me to be? Do you Lulu? Do you want Twilight to be a bad filly so you can punish her? C’mon don’t be so shy Lulu.” I let out a teasing pleading pout, “I’m not after anything bad.” I whispered seductively, “I don’t want a kingdom, or the world...I just want you.”

"Nnnnnfffff!" Luna let out a moan, as I teased her clit, "W-why are you doing this to us? T-this is utter f-folly, we promise you that y-you’ll get nothing from us!" I had to hand it to Lulu, she’s a tougher not to crack than i realized.

I could feel something pulling in the back of my mind, guess I took too long flying here. Well you know what they same about having fun...

"Tch...typical..." I frowned, "As much as I'd hate to come and go Lulu, but my time's almost up...I thought I'd have a bit longer..." I kissed Luna then backed away and leapt on to the balcony rail, spreading my wings. "Just remember my name Lulu...this won't be the last time you'll see me." Before Luna could say anything, the mystery mare leapt off and took flight leaving the princess of the night alone in her private chambers.

"Dusk c'mon man wake up!" Spike knocked impatiently on my bedroom door. "That's it I'm coming in..." Spike sighed, only to met with my sleeping form.

"H-huh...?" I yawned, "Oh...hey Spike."

"Gah...!" Spike yelled, "For Celestia's sake man put on some clothes, I don't want to see your junk!"

"W-wha...I'm pretty sure I..." I looked down and immediately covered myself out of embarrassment. Did I strip last night? It would explain why the window was open I could remember feeling hot. A bit unusual for this time of year, but not impossible. "Never mind Spike, I guess I got too hot last night."

"Yeah, yeah...just get dressed already." Spike replied as he left the room.

I couldn't remember anything from last night, I guess having all that hard work just crumble into dust just took it all out of me. I got dressed, and made start cleaning up my lab before getting back to the drawing board.

As I cleaned, I could felt restless like I was craving something but I couldn't figure out what it was. I would figure it out later, and I had work that needed doing.

Author's Note

Here's a new story for you all, here's hoping you enjoy it.

-Silent Out

Edit: Made a few grammar edits and correct a few things pointed out in the comments.
Edit 2: Extended the chapter a bit, fixed a shit load of grammar and spelling errors. Here's hoping the pacing a bit better.