From the very first moment she'd met her, up until a few scant seconds ago, Rainbow Dash had wanted nothing more in the world than to make Twilight happy. It was the driving force behind everything she'd ever done after that fateful day and here and now, Twilight was happier than Rainbow Dash had ever seen her. She was prancing around in her laboratory, humming to herself while various instruments and devices hovered around her in a telekinetic grip. She swung her hips and tail, making her lab coat sway and flutter along with her movements, and every now and then she'd stop and glance over at Rainbow Dash with the warmest, heart-melting smile Dash had ever seen.

It was almost enough to make her forget she was strapped down to a table. Almost.

"Ok. So, are you sure about this, Twi?" Rainbow sputtered nervously, giving her forelegs an experimental tug. The leather straps holding her down were tight enough to keep her firmly in position, but not so tight that they'd cause discomfort. Twilight was a scientist, not a sadist. At least, Rainbow hoped she wasn't. She'd coaxed her marefriend onto the table, promising her the restraints would tear away easily if the pegasus became skittish about the 'procedure' and true to Twilight's word, Rainbow had discovered the 'leather' cuffs Twilight had slipped her into were simply Velcro and nothing more. Tight Velcro, but Velcro all the same. Rainbow Dash could tug her forelegs free with one strong yank if she wanted to, but her hind legs? No. Twilight had firmly secured them to the end of the table, splayed wide apart and connected to real leather cuffs Rainbow had to unlatch if she'd wanted to get free, and to do that, she'd need to free her forelegs first. Ultimately, it was fairly safe and calmed what nervousness Rainbow experienced if and when her claustrophobia kicked in. She could free herself whenever she wanted to with little effort. Twilight, as per usual, had thought of everything.

"Mmmm...very," Twilight cooed, swinging her hips as she meandered around the lab. Rainbow bit her lower lip, watching her marefriend's plump hindquarters bounce and sway around the room. There was something different about Twilight lately. A confidence in her movements Rainbow hadn't ever noticed before. Surely it had to do with being in the laboratory. Twilight was in her element here. She knew every nook and cranny, vial, beaker and chemical in the room. There was nothing she wasn't in control of and that included the little blue pegasus she had strapped to the table. Rainbow had to admit: she kind of liked it.

"S-so what is this 'experiment' you want to do, and why did you need to bind my legs for it?" Rainbow asked, eyes still trained on Twilight's nerdy, shapely frame. The purple alicorn turned towards her, the smile fading from her lips and she narrowed her eyes.

"To keep you from kicking me. " Twilight deadpanned. Rainbow blushed faintly and winced.

"T-that only happened one time, Ok? And I said I was sorry!" the pegasus whined. Twilight shook her head with a quiet huff.

"Do you know how awkward the conversation was when I had lunch with my parents that day? They thought I was in an abusive relationship! I couldn't exactly tell them "Oh, yeah, this black eye? No, Rainbow Dash didn't hit me, she just came really, really hard and I couldn't get out of the way in time," Twilight snorted. Rainbow bit back a giggle and Twilight rolled her eyes, a hint of a smile tugging at her lips as well.

"And as for the experiment..." she purred, making her way over to Rainbow Dash, stopping just in front of her. Rainbow swallowed anxiously. The table was slanted at such an angle that Rainbow could lay on it comfortably with Twilight being eye level with her hips.

"We're going to figure out exactly what causes you to go off in ten seconds flat, isolate it, and craft an acceptable solution to the issue," Twilight said as a matter-of-fact. Rainbow nodded her head sheepishly but truth be told, she had no idea what that would entail. She did, however, trust Twilight, enough to let her truss her up to the table to begin with, so she closed her eyes and braced herself.

"To staaaaaart, we're going to need a base time to work off of," she cooed, stepping closer, until her nose was flush with Rainbow's lower belly, and her breath mingled with the raising scent of pegasus arousal. Rainbow bit her lower lip again.

"A-a base time?" she asked. Twilight nodded her head, drawing in a deep breath of Rainbow's personal aroma. It seared her nose and forced its way into her brain where it sizzled and popped furiously. Twilight shuddered, basking in the scent. The entire ordeal seemed to be getting to her. Never once did she expect that as some point in her life, she'd be performing sexual scientific experiments on her mare friend. But she was quickly discovering she liked it. She liked it quite a lot.

"Oh, yes...A base time starting now..." Twilight churred. Rainbow drew in a deep breath, holding it in her lungs while Twilight drove her nose forward, grinding it gently against the musky blue fur beneath Rainbow's belly. Behind her, A small golden stopwatch hovered into view, trembling in the air while The alicorn began her experiment. Softly, Twilight peppered loving little kisses along Rainbow's inner thighs, working her way past the sinewy muscles of her taut legs. She avoided her prize at first, simply drawing herself closer and closer, but she couldn't hold out for long. The juicy petals of Rainbow's sex were bare and right in front of her, begging for her tongue and she did not disappoint. It's not like she could have stopped herself anyway. There was something wildly alluring about listening to Rainbow moaning above her or the way she trembled and squeaked when she was on the very brink of an orgasm. Or the cute way she flickered her tail when she was getting close. All of it was adoration in its purest form and Twilight loved every minute of it. She craved it. From the first time they'd met, to only seconds ago, all Twilight had ever wanted was to make Rainbow happy. Sometimes, like now, that happiness was something physical and it was something she'd discovered she enjoyed giving freely.

Slowly, she planted her kisses closer and closer to Rainbow's trembling folds, the pegasus holding her breath in fierce anticipation. A burst of electricity rippled through the two of them as first contact was made, Rainbow throwing her head back with a quiet whimper and Twilight giving a warm coo when her lips touched Dash's. Another kiss came after that, and another still, Twilight finding her will power to keep things scientific was slowly washing away. Dear Celestia, was that scent getting even stronger? It couldn't possibly be affecting her any more than it already had, could it?

Twilight pulled back for a moment, shaking the scent away and gasping for a breath of fresh air, but it felt like the lab was saturated with the sour-sweet odor of arousal. A single bridge of Rainbow's juices clung to her lips, and the powerful fragrance had all but taken control of Twilight's senses. With Rainbow strapped to the table, there was nothing stopping her from indulging as much as she liked. Certainly not her own will power.

Things were becoming a tad more complex than she'd originally imagined for this experiment. She had completely failed to factor her own arousal into her hypothesis regarding Rainbow's stamina, and it was proving to be a costly error. She whimpered, squeezing her thighs together, feeling slippery wetness along her lower lips. Her own arousal was beginning to torment her, building and growing, driving her further into quite the needy state with every breath she took of Rainbow's personal musk. God, why did she have to smell so good?! The poor alicorn shuddered. Would it be wrong to touch herself? Just to relieve a little bit of the pressure? No. No, that would corrupt the data she was gathering in regards to Rainbow's stamina. She'd have to simply keep her hooves in check, regardless of how difficult her hormones were making things. Everything in her being was telling her to let go and give into her wanton lust. But no. No. She was a scientist. She could deal with her desires after she finished gathering data. With a quiet whimper, Twilight drove herself forward again, jamming her nose lovingly against Rainbow's crotch and her tongue took over. She slurped and licked, suckled and kissed, drinking her fill of Rainbow's slick juices. It was utterly heavenly. Somewhere, deep in the clearest parts of her mind, she was certain this was the best experiment she'd ever performed.

Rainbow Dash had not been prepared for this. When her marefriend told her she wanted to experiment on her, she had envisioned numerous books, test tubes and beakers, and boring charts and graphs, not the mind-bending ecstasy of Twilight's loving tongue. The poor pegasus shivered, doing her best to stave off the creeping orgasm threatening to wash over her but trying to hold back only seemed to make things that much more intense. How long had it been? She tried to squeeze her thighs together, tried to prevent the inevitable, but Twilight's bindings had made that impossible. Her only hope of defense lied in denying Twilight access to her pussy, and Twilight, of course, thought of everything. It didn't help matters at all that Twilight seemed beside herself with arousal. She was furiously working her tongue into Rainbow's sex like she couldn't get enough of her taste! Rainbow gave a hopeless shudder and bucked her hips forward.

"T-Twi...nnnggh...I- I think I'm, I'm already gettin' close..." she squawked, her hips beginning to tremble with need. Twilight didn't respond. Either entirely too absorbed in her 'work' or she simply didn't hear over the messy licks and kisses, the alicorn worshiping Rainbow's nether regions like she were in a trance. Struggling was futile. There was no stopping the onrush of pleasure starting to take hold, try as Rainbow might. Twilight seemed to sense this, and leaned in, placing her hooves on either side of Rainbow's hips, as if to keep her in place while she feasted. She was forceful, almost rough in her advances and it made Rainbow whimper all the more. She wasn't getting away from this- not if Twilight could help it.

"H-Hey! Twi! T-Twilight!" Rainbow squawked, her warning falling on deaf ears. Twilight was way too far gone to take heed of Rainbow's spasming hips, or helpless squeaks, her tongue caressing and circling Rainbow's clit in wet, slippery spirals. It was all much too much for Rainbow to resist, and she squeezed her eyes shut with a high pitched squeak of pleasure. Her body convulsed, shuddering violently against Twilight's face as her climax reached peaks she'd never known before. Was it the binding? Was it Twilight's confidence? Was it all of the above? Rainbow's legs made a vain attempt to kick forward from the pleasure that seized her muscles, and when that failed, her pelvis thrust forward instead, splashing Twilight with a sticky burst of her juices.

Twilight, who was not at all expecting Rainbow to actually squirt and certainly not to drench her with her pleasure, moaned helplessly. Why was that so incredibly hot? She'd eaten Rainbow Dash out multiple times before so why had this been so different? She stumbled back, landing on her rump and drew in a cleansing breath of the lab. At least, she tried to. More. She wanted more. She needed more. Rainbow's scent lingered fiercely in her nose, and on her tongue. She whimpered, grabbing the nearest thing she could: a plastic empty vial with a thick opening. The perfect size. She couldn't help herself. She couldn't stop herself.

Rainbow Dash saw stars. Bright yellow ones that flashed and flickered behind her closed eyelids. The orgasm Twilight had given her during the experiment had been one to rival all others in recent memory. Something about being strapped to a table while your marefriend forced her tongue as deep as she could into seemed to have a profound effect. Meekly, Rainbow opened her eyes. She stared. Twilight was laying on the floor in front of her, whimpering loudly and plunging a vial in and out of her swollen, needy sex. Had she been so entirely focused on Rainbow that she'd forgotten to tend to her own needs? Rainbow Dash grinned.

"Hey! Twi!" Rainbow cooed, giggling in delight when Twilight suddenly snapped back to her senses at her name being called. She blushed furiously and quickly scrambled up onto her hooves. She adjusted her lab coat, sat down and put the vial back on the table, while she smiled shyly like nothing had ever happened and she hadn't lost complete control. No, no, Twilight was in charge and a scientist. And a princess and it was most unbecoming of a princess to lose herself to overwhelming lust. Obviously, she would make sure It would not happen again. Things were worse now that she'd started but didn't get to finish herself off. But she'd deal with it. She had a long night ahead of her and couldn't afford to get sidetracked by her own needs. Above her, Rainbow snickered, her grin wide and unapologetic. Watching Twilight struggling to keep herself in check was a strange turn on, and an ego booster rolled into one. She'd never seen a princess masturbating before and it was an image she would hang on to for a long, long time.

"S-so...what was my time?" the pegasus snickered. Twilight froze, eyes widening in horror. She twisted around, finding the stopwatch on the floor, forgotten and abandoned in Twilight's pursuit of science. She'd never started it in the first place. She stared at the clock coldly, unable to comprehend what how'd she forgotten the entire point of why they were in the lab at one in the morning to begin with. She turned back towards Rainbow Dash and smiled. Nervously.

"I...erm...there was a bit of a mishap with the stopwatch," Twilight stammered. Rainbow glared.

"Seriously? SERIOUSLY Twi? I can't believe you!" the pegasus snapped, doing her absolute best to keep from breaking into a wide lust-ridden grin. " I guess, since you're my marefriend and all, we can try again," Rainbow Dash grinned impishly. Twilight followed suit, nodding her head before standing up on her hind legs to kiss Rainbow's nose.

"Well, I guess we'll have to. I just hope it doesn't cut time I set aside for the other experiments," Twilight said, shaking her head. Rainbow's eyes widened.

"Wait. What?" she asked flatly. The mirth in her voice gone, replaced by the cold tone of confusion. "What other experiments, Twi?" Twilight shook her head, a diabolical grin dancing across her features.

"You didn't think I was only going to perform one experiment, tonight, did you?" Twilight asked in disbelief. It was like Rainbow didn't know her at all.

"I, uh, y-yeah I sorta thought-" Rainbow stammered. Twilight shook her head, licking Rainbow's juices from her lips.

"Oooooooh, no. I said I was going to collect data, and I'm going to collect data. I'm a scientist worth her salt, you see, and that means we're going to be here all night," she purred. Rainbow swallowed. Mad scientist. Twilight was definitely slipping into mad scientist territory. She gave an experimental tug at her velcro bonds before glancing down at the nerd in the lab coat, who was already, and quite eagerly, nosing her way between Rainbow's legs again. It was going to be a long night...

Author's Note

This turned way more goofy than I had expected it too.
I'm okay with this.
Buuuuut then again, there are some spots I don't think flow quite right. I might end up revising this later.