>"Again, Butterscotch, thanks for helping me out today."
>The purple mare gets no reaction
>"Butterscotch?"
>Oh, yes, that's you
"Yes? Sorry, I was just looking at this book here."
>"Exclusive Micro-ecosystem In The Everfree Forest? It's really fun, but maybe later. You're here to help me today, remember?"
>You nod
>Twilight smiles happily at your response, and pulls a large, red book from the shelves
>'To Find And Manipulate A Unicorn's Nervous Centers, Or The Horn's Unknown Capacities, A Guide By Neuron Wave'
>Quite a mouthful
>Twilight opens the book, and flips to about halfway
>"There's a few 'self-experiments' here, but I need help doing them."
"But Twilight, you're a unicorn, right? Can't you just... levitate everything into place..?"
>"I'm glad you asked! See, about halfway through any of these, my magic just gives up. It's like flying, you need to concentrate to do it."
>Actually, flying's more like a second walking
>The added dimension of movement is what makes it hard
>You nod in agreement to her statement
>"Alright!"
>Twilight levitates the book over to you
>"Let's get started!"
>You take the book in your hooves and start to read
>You don't understand half of it, and what you do understand makes you unsure of wether or not this is a good plan
>You look up at Twilight
>To your surprise, she's gagged herself
>She notices your surprised expression, and giggles
>"Swfdy pwecussiuwn, pwge sifs."
>You don't know what she just tried to say, but you nod anyway
>After a while, you look up at twilight
"Um... What's a... 'magic extractor'?"
>Twilight seems to shudder at the word, and points to a small machine
>It looks like two irons, but smaller
>There's a note on one of them
>'THIS ONE > HORN TOP. OTHER ONE > HORN BASE. TURN TO 4.'
>Upon further inspection, one of the irons turns out to have a button which goes from OFF to 7
>You carefully grab hold of both devices, and place them on Twilight's horn
>You need both hooves to keep the things in place, so you have to use your mouth to turn them to 1
>Twilight immediately reacts with a light groan
"Should I stop?"
>Twilight, prepared as she is, hands you a note which reads 'NO'
>You swallow, and turn it up to 2, and, shortly after, to 3
>Twilight's groans grow into grunts
>By the time you've reached the third setting, you notice a few beads of sweat dripping down her forehead
>You again wonder if you should stop here
>But before you can ask, Twilight's hoof shifts towards the 'NO' note
>You swallow nervously before turning it up to 4
>The dives start giving off a gentle buzz
>Twilight's horn starts lighting up softly
>The mare herself is nearly screaming into her gag, and she looks about to go cross-eyed from the pain
>You have to fight yourself from turning off the machine, the only thing stopping you from doing so is the little paper on the floor by your hooves
>Twilight's legs start shaking, her voice wavers and her eyes start slowly rolling upwards
>She gives one final, agonizing grunt before collapsing
>You jump back a bit as her horn slips away from between the magic extractor
>Within seconds Twilight opens her eyes again, and stands up
>"Wow..."
"W-what happened?"
>"That's kind of a long story, but a magic extractor neutralizes magic in whatever its poles are bound to. Using it on a unicorn horn..."
>You decide now's a good moment to start putting the things away
>"Using it on a unicorn horn sends electric waves through the magical neurons, creating a wave of energy going straight to the pleasure center."
>It takes you a short while to decode that
"S-so you... Um..."
>Twilight steps forward, tilting her head sideways a bit
>"I what, Butterscotch?"
>A few wet drops on the wooden floor, right between where her hind hooves had been, tell you she has indeed
"Y-you know... Orgasmed..."
>"What? Oh, yeah, I did, and I must add it was a mind-blowing one at that! Let's do another one!"
"Um... Okay..."
>A purple aura appears around the book as Twilight brings it up to her face to read it
>"Ooh! This sounds nice!"
>She turns the book for you to read
"Auto... Autopsychic reading... Subconsious-decoding... Um... I don't understand..."
>Twilight blushes a little, as she realizes she actually has to explain
>"Well... The experiment focuses on using a mind-reading spell with a magic-reflector over my horn. As a result, I will read my own mind, and my subconsious desires should be ali- Sorry, pointed out, which couses both my concious and subconsious desires to grow, which is a self-increasing effect."
>You still don't really understand
>"In laypony's terms, I basically get incredibly aroused to the point where I might orgasm out of nowhere."
>She seems only slightly embarrassed to say it
"Okay... So, um... What do I do..?"
>Twilight levitates a silvery-looking cone shape in front of you
>"I need you to put this over my horn, and to..."
>Her ears flatten, and she blushes lightly
>"Well... You'll need to hold me down. And to prevent me from touching myself."
>You swallow, and join in her blushing
>You basically did the same thing just now, but this time you know she's getting off to it
"O-okay..."
>You place the cone over Twilight's horn with one hoof, and wrap the other around her body
"R-ready?"
>"Ready?"
>You both ask each other at the same time
>You nod, and twilight seems to start channeling magic
>You can't see her horn glow with the reflector over it, you still have a hunch
>After mere seconds, her eyes shoot open wide
>Her mouth opens to gasp, but it gets only half done
>Her muscles start tensing, seemingly at random, and holding her in place is getting harder
>She shuts her mouth again, so she can clench her teeth together
"S-should I... Does it hurt?"
>She can only barely answer
>"K-kind of, b-but keep going..."
>She's stamping one hoof one the ground now
"A-are you su-"
>"Keep going! It's working!"
>Twilight seems to relax again
>A small droplet of drool escapes her lips
>Next thing, an all too familiar scent fills your nose
>A quick glance confirms that her hind legs are practically drenched
>Twilight's panting by now, and softly brushing her body up against you
>She even shifts her rear to rub flanks
>You have to try your best in order to not run away this moment
>On the other hoof... This is kind of arousing
>After a minute of this, Twilight starts shifting again
>She bringing one hoof up to her thights
>You quickly remember your orders, and stop her hoof in its tracks
>Twilight doesn't even seem to take notice
>The 'sexual trance' of sorts continues for a few more minutes, only occasionally interrupted by her hoof trying to find its way to her sweet spot
>And you trying desperately to hide your boner
>But nature must have something either for or against you
>Your cock is near-impossible to hide at full mast
>After a while you just stop trying to hide it
>Twilight doesn't seem to notice anything anymore anyways
>But, surely enough, her eyes drift over to your crotch
>The moment she sees it, her jaw drops
>"S-stop... Stop! Take it off!"
>She quickly returns to her senses, and tries to push you away
>You land on your rear, Jr.  proudly standing up between your hind legs
>"Is... Is this real?"
"Well... I'm sorry, but... It was kind of... you know... arousing, and..."
>Twilight isn't listening
>She busy levitating measuring tape around to measure your dick's length, girdth and width, and triple-check it
>"Wow..."
>You blush
"I know it's kind of big, but-"
>"Kind of big? Kind of big my ass, Butterscotch! You're huge!"
>Her magic grabs hold of a crayon, which then draws a neat bell curve on the nearest blackboard
>"This is stallion genitalia size against how often that size occurs. Your size puts you about..."
>Twilight doesn't avert her gaze from your dick as the crayon floats several inches to the right of the blackboard
>"... here."
>You swallow
>You never knew you were /that/ huge...
>Twilight obviously also didn't
>"I want you. Now."
>You feel your wings hit the floor as Twilight pushes you on your back
>She quickly and efficiently straddles you
>She lowers her hips to push you inside her, and...
>She stops
>The moment the tip enters her, she stops moving and start softly quivering all over
"T-twilight? S-something wrong?"
>"B-butterscotch..."
"Yeah?"
>"We n-never... Finished the exp-periment..."
>It begins to dawn on you
"So...?"
>"I'm orgasming."
>Continuously?
"C-continuously?"
>Twilight onyl nods, as she starts slowly lowering herself again
>Despite your size, it proves an easy feat with all the natural lubricant
>Once you're fully inside, Twilight's shaking worsens
>"J-just a bit m-more..."
>Unsure of what to do, you bring up a hoof and gently, ever-so-gentle touch her clit
>Twilight throws her head back and lets out a pleasured wail
>"Oh yes! YES!"
>You feel her tighten around you, and her fluids flood your groin area
>You'll have to bathe later
>After a full thirty seconds, she finally calms down
>"Wow... Thanks you, Butterscotch!"
>She's about to get up again, when the situation becomes clear to her
>"Oh, yes. You need to cum too, right?"
"W-well, not necessarily, b-but..."
>"Do you mind if I make it quick?"
>Twilight doesn't wait for an answer before lighting up her horn
>You're only given a split second to wonder what she's doing before her magic penetrates your mind
>The entire world crumbles out of existence, until only the part where you and Twilight are connected remains
>Your mind, your entire being is filled with pure pleasure
>you want to cry out, but the only thing you can do at this moment is thrust upwards
>Twilight says something, but the words don't reach you
>you're in heaven
>The intense pleasure courses through every fiber of your soul, until it eventually overloads your circuits
>When you regain normal conciousness, you see you've also overloaded Twilight's pussy
>She gets off you, smiling softly
>"How was that? You were moaning like crazy!"
>You blush, nod, and say nothing
>Twilight levitates the book and all the equipment back to their respective places
>"That was so great! Definitely something if I ever get a coltfriend! I'm gonna take notes right now!"
>It only takes seconds for Twilight to get absorbed in her work
>You take the opportunity to leave
>you step outside and head for home tired, confused, and strangely immensly satisfied