>Twilight has finally convinced (annoyed) you to allow her to study human sexuality.
>You and Fluttershy are in an area Twilight prepared in her basement for this study, Twilight herself is sitting in the corner, ready to take notes.
>You strip, and Twilight immediately notes that your penis is disproportionately small for such a large creature.
>"Interesting, your genitals are roughly in the same size range as a stallion, despite you being much, much larger otherwise. I guess that's why sex wasn't a problem for the 2 of you."
>You explain that human evolution kinda traded off size for skill, and that you're about average for a human.
>she makes several pages worth of anatomical notes, then asks for you to proceed.
Yeah, the sooner this over, the better.
>"No no, for research purposes, I need you to do as well as you're able."
>As uncomfortable as you are with this, Fluttershy is probably much more embarrassed.
>"You two just act like I'm not here."
>Easier said than done.

>Twilight being there kills any romance in the room, just....kills it.
>You still go about some foreplay anyhow, and lay Fluttershy on her back.
>Twilight finds your choice of position strange.
>Kisses, ear scratches, light flank slaps, playing with her wings, massaging, some teasing, all the benefits of those dextrous hands, as well a dominant love bite or 2.
>And of course, dem crotchboobs.
>Twilight is rather enamored by your finger work, Fluttershy looks halfway there and you haven't even entered her yet.
>You plunge into her velvety depths, almost completely pulling out then hilting with every thrust, which Twilight notes with surprise.
>You'd picked up a book on equine sexuality early on, which pointed out their vaginal lips were a lot more sensitive than most of their insides, something stallions couldn't really attend, but you took heavy advantage of.
>Within 20 seconds, Fluttershy releases a gush of a semi-clear liquid with a slight yellow tinge.
>Her black slit winking repeatedly around your member, producing heavenly sensations.
>"A full maregasm? My books say that even the most skilled stallions can rarely bring on such intense orgasms."

>You barely notice her babbling on, but she quickly shuts up anyway when she sees you still thrusting after the 3 minute mark.
>"Anon, are you STILL going?"
>You ignore her.
>7 minutes, 3 maregasms. Twilight is scratching notes at an incredible pace.
>13 minutes 5 maregasms, Twilight looks very flustered, between your fucking and hand work, Fluttershy's mental state is just a puddle of orgasmic bliss.
>19 minutes, 8 maregasms, Twilight is just....staring, mouth agape, quills fly about the room on amidst huge sheets of paper.
>22 minutes, you tense up, and finally release your seed into your lover with a heavy sigh, the contractions of her continued winking practically milking you.
>Finally, you pull out.

>Twilight is dumbfounded. Finally, she manages to speak.
>"I....after that, wow. You're probably gonna be out of energy for a few days at le..."
>You thrust back in, she wanted to see what you can do, you're gonna show her.
>Since you didn't take any recovery time, the sensation is dulled making you take even longer
>Pulling at 28 minutes, Fluttershy is what can only be described as "Fucked silly".
>Twilight is, for once, speechless.
>After taking a only a couple of minutes for a breather, you head back in, this time pulling 35 minutes.
>You're not ever sure if Fluttershy in conscious, she's just laying there, eyes rolled back, making low moans, squeaks, and incoherent babbles.
>Pulling out, you're breathing heavily. You don't think you're up for another round.
Alright, I think *huff* I think I'm done for now.
>"But, you, she....."
Full sentences Twilight.
>She still can't seem to figure out what to say.
>While she's thinking, you decide to go ahead and clean up.
>Pulling Fluttershy from the puddle of her fluids, you head to the shower and wash the both of you, redress, and get Fluttershy a big glass of water to replace some of those fluids she let out.

>Heading back into the basement, Twilight seems to have written at least a book worth of things since you left.
>The room is still heavy with Fluttershy's scent.
>"I figured it out, you must have found some kind of stamina potion to keep you going."
What?
>"That's how you did it, right? That's how you kept going like that."
Sorry to burst your bubble, but that's really how humans work.
>"Okay, joke's over. Your prank is messing with legitimate scientific studies."
>"Um, Twilight, he's not joking, I promise. Our sessions are usually about 15 minutes at least."
We go through a lot of towels.
>"I...well, thank you for your contribution to science, here's your pay."
>She levitates over a bag containing 500 bits.
>Before you grab it, she speaks up.

>"Out of curiosity, how long does it take a human to recover from a session like that?"
I've already got my wind back, now we rea...
>"WHAT? You weren't away 30 minutes!"
Yeah, so, me and Fl....
>"If you're up to it, I'd like to test that supposed regeneration, and see how that stamina lasts against....other orifices."
>Did she seriously just ask that?
>Well, she got you to do....this already.
I don't think so.
>"There's an extra 500 bits in it if you do both."
>Fuck, you are hurting for cash.
>You look down to Fluttershy.
What do you think honey?
>"Um, well, it is for science, so, I guess it's alright."
Fine Twilight. I feel like a whore though.
>"Excellent, I'm sure there's a book around here to help you when you get to anal, I hear it's pretty difficult."
Don't bother, we've done it before.
>"It...it's his favorite hole." Fluttershy blurts out.
She....really didn't need to know that.
>Awkward silence
>"Anyway, let's get started shall we?"

>You're sitting on a stool, Fluttershy on her haunches in front of you.
>Twilight immediately notes that, as she thought, this process seems to be a lot easier for bipeds.
>"Alright Fluttershy, please proceed."
>She's quite embarrassed, but goes ahead, taking you into her mouth.
>She's learned where all your buttons are since that first sloppy, drunken BJ when you first arrived.
>You can't do much for her from this position, but you still try to do more than just sit there.
>Petting her, a touch of direction, a push on the neck to speed her up, a light tug of the mane to slow her down, complimenting her.
>And of course, scratching her ears, hot damn are pony ears cute.
>Between being a bit sensitive after the initial numbness from earlier wore off, and her knowing just how to set you off, you last about 9 minutes, letting out an audible grunt and sigh.
>Though you're sure you've got nothing left at this point, you still feel the muscles in Flutters throat contract as she swallows.
>She pulls off with a bit of suction and a tiny pop, and looks up at you, blushing hard.
>You reach out and pet her, complimenting her efforts, and earning a smile.

>"Very good, lets move onto the last act."
>Fluttershy stands, leaving a small spot of her lubricant on the basement floor where she was sitting.
>You move over to the bed Twilight had set up for this.
>There's a very large wet spot from earlier, so you opt to set Fluttershy on her stomach on a dry spot in the corner while you stand.
>You lube your member, then proceed to prepare her.
>You pour some lube onto her shiny black ring, and proceed to rub it in.
>A little more lube, and you slip a finger in.
>Encouraged by her moaning, you slip another in and go at her to loosen her up.
>Finally, she seems ready, and you're prepared to ruin that flank.
>You slide your member in, inch by inch, until you're fully hilted, her making pleasured squeaks all the while.
>After pouring on some more lube, you start to thrust.
>She's very warm, and very tight. You adore this hole, and feel lucky that she enjoys it too.
>You're still numb from the oral, so you know you'll have more time with this one.
>After a while, you're in the zone, and you decide to give Fluttershy a nice working over.

>Tracing your fingers over her cutie mark, you raise your hand and land a firm slap on her flank, she squeals and squeezes, before relaxing back into moans.
>You start to rub her back, flanks, and wings with one hand, and drop your other to her dark slit, and plunge a few fingers in.
>Your index and middle assault her g-spot, while your thumb rubs her clit, causing her to yelp and wink.
>After a while, you cease your massages to give her butterfly adorned flanks a few more slaps.
>The first blow puts her back over the edge of full maregasm, releasing her fluids to the floor, and squeezing your dick like a vice.
>When she relaxes again, you resume thrusting, tormenting her with your fingers, and massaging her.
>The process repeats several times, before you finally feel your own orgasm coming.
>You cease attending her, and grab her tail and mane, burying yourself in her.
>In your passion, you throw your arms around her and lift her up, and roughly fuck her standing, causing her to loose herself one last time with a meek yell as you finish.
>14 minutes
>You just stand there, buried inside her bowels, and gasping for air.
>Finally, you come to your senses, set her back onto the bed, and pull out.

>Looking over, Twilight is practically buried beneath her notes.
>"You two just go wash up, while I finish these."
>Shrugging, you carry Fluttershy to the bathroom to wash up again.
>When you finish, Twilight is in the main area of the library.
>"Ah, there you are. Thank you, both of you, this has been very informative."
>"Now I don't suppose you'd be willing to go further?
No, I'm getting a bit tired, and Fluttershy can't even hold her eyes open.
>"Well, come back if you ever want to help the cause of science again."
I'll keep that in mind, enjoy the squash soup.
>You set the sleeping pegasus onto your shoulders, and begin the walk home and to bed.

-

>2 weeks later.
>You're heading into town to pick up some things for the house, Fluttershy walking at your side.
>You notice a lot of mares are giggling when you pass, and a lot of stallions are giving you dirty looks.
>Suddenly, a group of mares jumps in front of you, giggling and blocking your path.
Umm, hi?
>They giggle again, and you could swear you see their tails lifting.
>"Mr.Anon, we were just wondering if you could sign our books for us."
Books?
>A unicorn magics you over a copy, Fluttershy flies to your shoulder to see what it's about too.

>Human Sexuality: Pleasure Given Form
>By Twilight Sparkle, with research assistants, Anon Y. Mous & Fluttershy
Wat....
>You flip through, it's detailed.
>Very detailed.
>This borders on pornography.
>"The man continued to thrust his tireless shaft into his mare, his effortless skill and imposing form leaving no doubt that she WAS his."
>"Her tongue worked his rod, wanting nothing more than to show him the same pleasure she'd received."
>"Plunging into her most forbidden depths, the man, peerless in skill, still inflicts more pleasure upon his lover than the equine body was ever meant to handle."
>This IS pornography.
>Graphic, detailed, accounts of everything you did to Fluttershy in story form.
>Looking up, you see many, MANY mares are around the two of you now, with high raised tails.
>You also see many stallions at the edges of the group, practically oozing jealousy.
>You can feel their [spoiler]HATE[/spoiler].

>Suddenly, questions and compliments.
>"Is the book true?"
>"Is hot monkey dick as great as the book makes it sound?"
>"Can humans really go that long?"
>"Do humans really not have those painful flares?"
>"How many maregasms did you have?"
>"The book makes stallions seem so sloppy."
>"Does the lack of flares make non-vaginal enjoyable?"
>"His fingers sound so wonderful."
>You never asked for this, you thought it was for scientific study, not pornography.
>You and Fluttershy let loose an uncharacteristic shout at once.
God. Fucking. Damn you Twilight.