.-+*"*-.-*"*+-.
Experiment Successful
'*+-. .-+*'

Rainbow's mind warped as she slowly found himself drifting awake. She vaguely felt his head turn but the world shifted in the opposite direction, mocking the movement, sending his whole body into a world of discomfort and disconnection. Her head seemed to rest on a pillow, his body was covered by fabric on all sides. It would not respond to his mind's commands though, it felt as though she was disconnected and simply going for a nauseating ride. His head swayed in place and her body fell deeper into the fabric.

'That must have been some party...' one part of her mind laughed, the sound echoing in her flittering consciousness. It wasn't like that though, his body was wrong and her mind was swimming in an endless sea of warping waves and crushing swirls. She almost wished his brain was simply lit with the fire of a hangover; that would've been so much easier to deal with. Now though, her mind felt as though it was trying to stay afloat, struggling and gasping for breath.

Through the haze, she gradually became aware of his body. She didn't want to focus too hard, because he felt as though thinking too hard would end up making her mind fall too far, unable to resurface. He mentally touched over his body, as much as he could feel in the cocoon of fabric that entrapped her. His body felt... ballooned... as if it was touching more fabric than it was supposed to; it felt as though his body was larger than she remembered.

A sound cut through the sea of confusion. It was an anchor that fell right next to her, so he latched onto it so he could stay in the one place for now. He was carried into the sound that followed, a voice.

"Rainbow Dash? How are you feeling?" The sound was almost sickeningly sweet, though muffled by the fog contained within his head. It took a few moments, but eventually his brain managed to decode that muffled speech and relay to him that the voice belonged to Twilight, and that she asked her a question.

Rainbow tried his best to respond, but the sounds of her voice became lost, both in her limited ability to command his body and in the fabric that was pushed up against his face. As her voice broke free of his mouth, the mumble it was, he lightly remarked that her voice sounded different, he could feel it in her chest; it was deeper than usual. Somehow the message got across, whatever it was.

"That's to be expected, right now your brain is undergoing the process of ridding your body of any female hormones remaining in your system," Twilight's voice replied, "You've been asleep for about 14 hours now, but it's probably a good idea to go back to sleep for another few hours. I'm going to cast a sleep spell on you to help you fall asleep through the pain, okay?"

A grunt escaped Rainbow's throat and fell into his fabric prison.

"All right, you may feel a slight tingling sensation in your head for the next few..." The last of Twilight's speech faded with his consciousness, but, as one last fleeting glance into clarity, his mind remarked upon Twilight's presence. Amidst the haze, it felt as though Twilight was making her feel different inside, it was something to do with her voice, or the way she smelled. Before he could think about it any longer, her mind fell and his body relaxed as he finally let herself go, to be washed away by the sea into blissful serenity.

.o0O0o.

The next time he awoke, he was far more aware and in far better condition. His mind was no longer warping, and his body only ached as if he'd run a marathon a few days ago, it was a very familiar ache that he didn't really mind all that much.

Suddenly, his nose caught something in the air, something sweet and alluring. Something that made his mouth water with anticipation. It was musky, and salty, it felt warm in his nose. It woke him up completely, aroused him from his slumber. He shivered in anticipation as the compelling scent awoken something unknown inside of him, some kind of ravenous hunger. He wanted to find the source of the delicious smell and devour it for all it was worth.

It was hay bacon, he could definitely smell hay bacon.

"Good morning sleepy head," Twilight's voice entered his mind, "you've slept for a total of 20 hours, I figured you might be hungry."

He opened his mouth to give a response, but it was not needed, his stomach had already cut to the chase by letting out a loud growl. Twilight giggled at the sound, she levitated the tray of hay burgers over to where Rainbow Dash lay. He sat up slowly, as to not aggravate the ache in his muscles any more than he needed to. As soon as the tray of burgers landed on the sheets he quickly picked up the first of five burgers and set on devouring the greasy goodness. He let out a moan as the mouth-watering taste of a quarter pound of vegetable patty seised his tongue.

"So, as far as I can tell, the transformation was a success, it seems as though there are no negative effects during or after the process. As for now, there are three more things I need to finalise before I label this experiment as a success, starting with a short psychological evaluation. So, tell me Rainbow Dash," Twilight said as she levitated up a quill and the clipboard with all her notes, "how do you feel?"

He was taken back by what Twilight had said, 'Transformation? What tran- Oh right!' suddenly, the memories of the previous day's events flooded into his mind, along with the feeling of pain and the realisation of his change. He wanted to see the change for himself, but he couldn't really move as he wanted to at the moment, due to him not wanting to disrupt the Celestia-sent burgers in his lap, but he was able to just feel himself with his mind for a moment. He definitely felt... well... bigger than usual, and also he could feel something extra between his legs. He didn't want to get too excited yet, but if it was what he thought it was, he was going to be very happy. He then noticed, that throughout his entire examination of himself, he didn't really consider himself any part female any more. He remembered the feeling of confusion he felt earlier, when he just woke up, but now his mind was definitely certain, he was now a dude, no questions about it.

He pondered Twilight's question for a few moments as he chewed on his burger, eventually, he swallowed his mouthful and began to speak, "I don't know I-"

He coughed and became confused for a moment at the sound of his voice, it was way deeper than usual, and it didn't have that feminine quality that it used to have. He cleared his throat and spoke again, testing his new voice, "Hello? Hello. Hellllooooooo..." He said the last hello in his deepest voice, dragging out the syllables to really hear the extent of the change. He laughed at the sound, he looked over to Twilight to see that she had pursed her lips and narrowed her eyes at him, waiting for him to answer the question. He cleared his throat, "I don't know, I don't feel too different from before, a little larger I guess?"

'A little larger is not what I'd say,' Twilight thought as she scribbled away on her clipboard. "Ah huh, any pain or discomfort, especially in the head?"

The final bite was taken from the first burger, "My head feels fine, but the rest of my body? A little sore, but it's not too bad, it's the same kind of ache I get from exercising, no biggie." He swiftly moved on to start on eating the second burger as the sounds of a scratching quill filled the room.

"Okay, what about my presence here, do you think that you feel any different towards me now than you did before?"

"Hmm..." Rainbow hummed around his burger, he took the time to really look into his friend. He saw the way she was sitting, plot to the floor, tail curled neatly over her hind legs, left forearm bracing the ground, and her right forearm positioned so her head was leaning on her hoof, in the adorkable style Twilight is famous for. All of this was compounded by the lab coat she was wearing, he realised that she actually looked... very attractive; she was ridiculously attractive. It was something to do with the way her legs and tail were positioned, or the way her hair fell just above her eyes to give her the kind of accents in her eyes that displayed a certain amount of insecurity bolstered by an amazing intellect. He fell into a daze as he stared at Twilight for a while, not realising that he had his mouth open in a very unflattering way, and that the sauces in the burger were starting to drip.

The sensation of sauce hitting his barrel from his mouth shocked him out of his inspections, he quickly swallowed the bite before answering, "Wow... I don't think I felt this about you before, but holy Luna you are sexy Twilight," Twilight's ears tweaked when she heard that, her eyes shifted away from the clipboard and at Rainbow as she silently demanded elaboration. Rainbow continued, "You have this quality about you that screams I'm a nerd, but also whispers I'm a sexy beast, like I'll take you to my room and let you ravage me sort of sexy beast, and sweet Celestia I now know what it feels like to have a boner." The tray of burgers shifted on his lap as his hardening addition pushed against it from under the covers, he looked towards the bulge in the covers with his eyebrows raised, the slightly uncomfortable feeling of being aroused journeyed into his mind from the base of his stomach.

Twilight looked away from Rainbow and back to her notes, her cheeks lighting on fire from his explanation. "Uhh... Thanks, I guess?" She said as she busied herself with writing out what he said.

"No sweat," he shrugged and went back to finishing off his second burger before moving onto the third, he was still very hungry after all. The feeling of his boner still piqued at the edge of his consciousness though, but it was put aside for now in favour of the delicious food in front of him. Honestly, it did feel a bit uncomfortable being bunched beneath the covers of the bed and the tray. He shifted the tray slightly when he picked up his third burger, and it moved along his penis, causing the sensitive tool to flex, activating a muscle that Rainbow had never felt before. It was pleasurable, but it also slightly ached.

Once Twilight had finished with the questions, she cleared her throat and brought up the next part of her analysis, "Okay, now I need to take some measurements, just to see the extent of the physical changes, stretch out your hoof please."

Rainbow did as instructed, showing her his left hoof, while keeping the burger in his right. A tape measure, likely borrowed from Rarity, floated out from wherever Twilight was keeping it and snaked its way to Rainbow's arm. She read the measurement off the tape and wrote down the difference, "It seems your foreleg is about 5 inches longer than before, now for the diameter at various parts on your leg." The tape wrapped around the tip of his hoof, his wrist, his elbow joint, and just before the shoulder joint. After the measurements were written down she did a few calculations and recited the results, "There seems to be a fairly even growth around the foreleg of about 1 to 2.5 inches, leading to an average of 1.8 more inches to the diameter of your leg."

Rainbow nodded, though not really caring about the exact dimensions of his foreleg, to be honest, he was more concerned with the dimensions of a certain fifth leg he'd acquired. He took the last bite to the third burger and moved to the forth. Twilight wanted him to sit up a bit more and turn his back to her so she could access his back and wings. She remarked on more of his sizes but he had tuned her voice out in favour of the second last burger in his hooves. He was honestly quite impressed at the amount he had eaten, when he had a mare's body, three full size hay burgers like these would be a challenge, but he had just demolished three and was moving onto the fourth with no problems.

"And last but not least, I need you to lower the covers so I can measure your hind legs," Twilight cut through his tuning out, she levitated the tray with the last burger on it away from his lap to allow him to comply. He lowered the covers with ne'er a thought, exposing his lower body. Being measured and treated like a test subject wasn't really all that arousing, so his penis had retracted into his sheath in the meantime.

After the measuring tape moved about his hind legs a lot like how it did to his foreleg, and Twilight had got what she needed, she ran the calculations to find out just how much bigger Rainbow had become. "Well, judging by my calculations, you should stand at least 10 to 12 inches taller than before, with your overall body depth and width increasing by about 6 inches. All in all, your body seemed to experience a mean increase of about 19.63742 percent, or about twenty percent if you want to round." Rainbow had finished his fourth burger, and wanted to move on to the last burger, but because Twilight levitated the tray out of the way, he couldn't reach it. He let out a sorrowful whine as he tried to reach across in vain to it.

Twilight ignored him though, and moved on to the next part of her measurements. "Okay, now to move on to the size of your, well, additions," she cleared her throat and commanded him to allow her easier access, "I need you to sit facing me."

He sighed and looked with longing at the remaining burger, but he complied to Twilight's instructions. Once he was seated facing Twilight, she pressed the tape against his testicles. He could feel the slight tingling of magic against his sensitive orbs as she levitated the tape close to them, "Okay," she leaned in to try and get a better reading, "It seems that your testicles together have a total width of about 3 and a half inches, leading me to assume that each testicle is..." she trailed off as she breathed deeply, she exhaled with a sound, "Whoh, there's no doubt that you smell like a stallion, your musk is a bit... a bit intoxicating." She shook her head, a blush adorning her cheeks "Anyway, the total width leads me to assume that each testicle is about 1.5 inches in diameter."

Finally finding out exactly how big his additions were was really turning Rainbow on, again he could feel the aching of his penis coming alive and becoming hard. He shifted a bit where he sat, 'Gees, this thing is insistent' he thought to himself, a blush from the exposure finding its way to his cheeks.

"I'm not a Biology major," Twilight continued, unabated by Rainbow's movements, "but if my calculations are correct, barring any abnormality within the transformation, and without looking directly at any ejaculate, you should release anywhere between..." Twilight's eyes slightly glazed as she ran the numbers over in her mind, three times to make sure, "600 and 900 million sperm per release."

"Whoa," Rainbow said, blanching at the number, but not really understanding the implications, "that's a lot right?"

"It's twice the average amount," she nodded, 'The elements of harmony really did have a great effect on her transformation. It's time for the main question to be answered,' she thought slyly to herself. She cleared her throat, "Now," she said aloud, directing Rainbow's attention towards her once more, "I must get the measurements of your shaft to complete the physical changes section of the evaluation. In order to do this, I need you to be fully erect, so..." she lowered her voice as she stepped closer to the stallion on the bed, she gingerly climbed up onto the bed and over the stallion. She narrowed her eyes as she looked into the stallion's. Positioned over him like she was, she could really feel the difference the transformation had on her friend, she could feel the power hiding underneath his pelt, the strength in his new muscles, it sent a shiver down her spine as her touch sent a shiver down his. She leaned in close to him, lowering herself so she was close to his ears, she whispered the rest of her speech in the sultriest voice she could manage, "... I need to see how far your attraction to me goes."

Rainbow looked into her eyes when she lifted her head again, he was excited, intimidated, embarrassed and slightly uncomfortable all at once from at Twilight's proximity and her warm breath tickling his ears. When Twilight came close to him, he couldn't help but breath in her scent. She smelled really nice, it was a lavender scent that was mixed with a hint of her arousal. It definitely did the trick of turning him on, but if Twilight didn't believe that he was, she made it certain by her next action. She, slowly, moved lower down Rainbow's body, allowing her body to lightly graze against his throbbing erection, causing it to flex with every touch of her fur. Twilight continued to lock eyes with Rainbow as she moved, letting a small grin grace her lips from Rainbow's reactions.

After an eternity for him, Twilight found her way to the tip of his hardening penis. She planted a little kiss on it, which made Rainbow close his eyes and let out a small moan. She then moved further down, navigating to the base of his shaft, gently nuzzling it as she went. When she finally made it, she did something that made his breath catch. She closed her eyes and dipped her tongue out, she then touched it to the base of his shaft, and slowly dragged it upwards to the tip. For every second she travelled, she lightly caressed his testicles with her hooves, massaging them as she travelled up his massive shaft that got even harder by the second. She stopped at the halfway point to wrap her tongue as far as she could around his thickness, but of course, due to the size, her tongue didn't get far. She opened her eyes and looked into Rainbow's. He shuddered as she did so, causing her to giggle at the effect she was having on him. She gave his medial ring a light kiss before resuming her tongue's journey to the tip, never letting his balls go un-massaged.

It took a torturously long time for Twilight to finish her journey, she kissed his tip again once she made it to the top. Then she forwent massaging his hanging orbs and wrapped both her hooves around his cock. She leaned back and pulled it towards her slightly, causing Rainbow to close his eyes and let out a very deep and low groan of pleasure. Once he settled again, she locked eyes with him and gently sucked on the head of his penis, drawing it into her mouth. Once she managed to stretch her jaw around the tip, she pushed down a couple of inches. She savoured the taste of the stallion for a moment, while not letting her eyes drift from his. After a while of staying static, she began to bob her head up and down. The action caused an immediate reaction from Rainbow, he arched his back due to the pleasure and let out a very loud moan.

Twilight continued her ministrations, every time she dipped her head she traveled further down the giant dick. Her saliva coated the first few inches of his penis, allowing her to move her head more smoothly and enabling her to reach further down his dick. Eventually, she managed to reach the point where his tip pressed against her uvula, she scrunched her eyes closed as she fought against her gag reflex. Once she managed to calm herself down, she opened her eyes.

His medial ring was still a few inches away.

She moaned at the implication that she wouldn't even be able to completely swallow his cock due to its massive size. Rainbow reciprocated the noise, her throat vibrated in her groan, causing the sensation to release all kinds of pleasure into the mind of the stallion. Eventually, after staying there for a while, Twilight slowly dragged up his shaft. Letting the hunk of meat fall out of her mouth. She breathed in, replenishing her supply of oxygen.

"Alright," she said, her voice slightly croaky, "I believe I have you hard enough, just let me..." she levitated the clipboard and measuring tape up once again, quickly setting about measuring the dimensions of his throbbing erection. The tape first rolled down his shaft, reading the total length of it from his scrotum to the tip, she wrote down the two digits with a shudder of anticipation. The tape then snaked its way to wrap around the base of his shaft, then the area just before the medial ring, the medial ring itself, and finally, the area just below the tip. Each time the tape wrapped around his hard shaft and moved, the feeling of lust and need grew larger in Rainbow's mind. It was driving him mental.

"Well, Twi'? How big am I?" Rainbow asked her, his tone becoming ragged and rushed as the pain of his bluing balls became apparent. His eyes opened wide at the amount of discomfort he felt from the air caressing his wet shaft, his dick flexed at the feeling. He found himself wanting to jump off the bed, tackle Twilight to the floor and relentlessly fuck her until he could release. He didn't understand just how powerful that feeling was when he was a mare. When meeting with her friends at the bar, she'd always overhear stallions complain about being 'blue-balled'. He never really understood why stallions would complain about it so much, but after he felt what they were complaining about, he knew it was indeed, the worst.

"Right, well, the thickness of your shaft at the base is about 2.5 inches in diameter, it then extends to 2.3 by your medial ring, which has a thickness of 2.4 inches, then, at the top it is 2 inches thick," as she was narrating the dimensions, she pointed at the areas the mentioned, causing Rainbow's sensitive shaft to flex every time. "As for the length," she continued, "from base to mid is about 6.5 inches, and from mid to tip is about 6 inches, the entire thing is 12.6 inches long, give or take."

"Really?" Rainbow said as he robotically wrapped his own hooves around his aching cock, the feeling of aching becoming too much to bare, "That's pretty damned big for a stallion."

"It is, it's just over twice the size of the average stallion," Twilight looked at his impressive shaft as he subconsciously began to stroke it, the feeling of his hooves rubbing along his dampened shaft had a wondrous effect on his mind, "Rainbow Dash, you are, quite literally, twice the stallion most stallions are."

Rainbow let out a single syllable laugh as he properly appraised his fleshy totem. Then he randomly thought back to what Twilight had said when he woke up, "Wait a minute, you said there were three things you needed to do, what's next."

Twilight grinned as her eyes lowered in a sultry gaze once more. "Biological Evaluation," she purred and winked, both with her eye and with something else, "now I know how big it is, it's time to know whether it actually works or not."

Rainbow blinked, but before he could react Twilight once again climbed up on the bed.

"I need to know the extent of the difference between how you'd react as a mare and as a stallion," once she was on top of him, she turned around and sat on his chest. Her dripping pussy dampening the stallion's barrel as the aroma of arousal overtook his mind, once seated, she turned her neck to face him. "So," she said, her voice becoming breathless, she leaned forward and moved so that her dripping entrance was right near his face and nose, "what does this do to you?"

Rainbow was overcome by her arousal, his mind struggling to answer her question as his penis' mind slowly took over, "It's- It... It sort of..." he breathed in deeply, "oh buck it," he gave up on trying to explain it and instead showed her what she did to him; by grabbing her flanks and shoving his snout into her winking slit. He dragged his tongue from the bottom of her slit to the top, once, twice, thrice, like he would the most delicious ice-cream. Twilight arched her back and groaned in pleasure, her wings flared as she cried out. Rainbow licked her again, but this time, forcing his tongue as far as it could go inside her. He moaned into her pussy, to employ the same tactic she used against him previously, using the vibrations to assail her mind with pleasure.

He greedily devoured the mare on top of him, her juices leaked down his snout as he tried to slide his tongue deeper within her, trying to make her feel the greatest pleasure she had ever known and succeeding. She gasped as he pulled away to get a breath of air and blow gently on her slit, causing her clit to expose itself as she winked. He blew again, trying to reveal it once more, and once it did he dove in and sucked on it. She screamed at the sensation. Her juices splashed against Rainbow's face as she came violently. Rainbow licked at and drunk the powerfully tasting liquids, giving her tender lips gentle kisses and licks to extend the feeling of pleasure overloaded.

Her head lowered down onto his throbbing erection as she rode the waves of her orgasm. "There," he said, breathing deeply due to the exertion, "is that a good enough answer?"

"Oh yesssss," Twilight hissed and moaned, letting the crashing waves of her climax slowly subside. Rainbow was waiting for Twilight to get the clipboard again to write down her observations, but she paid it no mind. After a moment of recovery, she spoke, "N- now I need to make you ejaculate..." As her mind returned to her, she slowed her breathing and attempted to return to somewhat normal functionality, she continued, "...to see if you have that functionality". She lifted her hoof and used it to push herself up. A brief flash of light caught Rainbow's eyes as Twilight cast a spell, it removed her lab coat, and judging by the residual glow on her nether regions and lower stomach, it looked like she also put an anti-pregnancy spell on herself, she was going to let Rainbow finish inside of her. This excited him to no end.

Once she was somewhat up, she turned around, faced Rainbow Dash again, and sat down. Her sensitive flesh rested on his dick, causing her to let out an exhale. As her breath returned to her, she leaned in close to Rainbow, closed her eyes, and kissed him on the lips. Rainbow wrapped his hooves around his lover and pressed his lips against hers, kissing her deeply. Twilight leaned into the kiss, letting it be long and passionate. After a few moments Twilight felt his tongue press against her teeth for entrance, she couldn't help but oblige.

His tongue was powerful, it easily fought and won against Twilight's for exploration rights in her mouth. He let her know what she tasted like as he pushed her tongue around with his, sharing the remaining 'Twilight's flavour' on his tongue. She felt his tongue explore and move around her mouth. Eventually, his tongue pulled back, allowing her to search his mouth. She didn't know what she was finding, but she could search for it for an eternity.

She began slowly thrusting, pressing her soaking and sensitive lips against his dick, causing them both to moan into each other's mouths. The action flipped a switch, they increased the speed of their movements in each other's mouths, and doubled their ferocity. They broke for a second for a breath before diving back in for more. Twilight dragged her pussy up and down Rainbow's shaft, making it nice and lubricated.

Twilight moaned as the pleasure of rubbing herself against him got too much, she broke away from the kiss and dragged herself to the tip of his soaking cock. She pressed her lips against it, letting herself get used to the feeling of pushing such a large object inside her. Eventually she stretched her lips around the tip, and pushed down. She moaned out a quiet "Ffffuck..." as her pussy stretched further around his massive shaft. She gasped and moaned, matching the sounds Rainbow Dash made as she slid down his cock.

Twilight let out a long high pitched groan as she pushed herself down further onto Rainbow's massive spire. Pleasure radiated from deep within her as the penis pushed further and further inside her. The pure thickness of the tool was distorting the size of the cock inside her, the stretching of her vagina made her believe that she was further down than she actually was. The feeling of her lower lips landing on the bump of his medial ring made her realise that she was only half way.

She stopped at the halfway point and groaned, the feeling of ecstasy crept into her brain as she began to gyrate on his medial ring. After a moment of just subsiding, she slowly lifted herself up until just the tip of his penis was still inside of her. Then she came falling down, she took Rainbow's cock passed halfway, the ring sending Twilight into a world of pleasure as her tender lips pushed over it.

Rainbow was in heaven. Twilight's tight pussy was squeezing his dick in all the right places. He moaned in conjunction to Twilight when she speared herself on him, his penis pressed up against her inner walls. She moved to lift herself again. She slid slowly upwards, driving Rainbow mad with pleasure. He wanted to grab her by the flanks and thrust into her until their hips met, but he restrained himself. He bit his lips as Twilight's clenching vagina made its second journey to the tip of his shaft.

She raised and lowered slightly, letting her lower lips kiss Rainbow's penis a couple of times, he couldn't help but thrust slightly into her, the feeling of her pussy encasing then leaving the very tip of his shaft was driving him insane. Before long, she once more slammed down onto him. The feeling of the deep penetration was too much for Twilight, as soon as she got down as far as she could, her brain lit up with the fury of another orgasm. Her nethers clenched at Rainbow's penis, trying to milk it for his glorious substance, but it was for naught; he was yet to climax.

Twilight moaned deeply as she came down from the second orgasm Rainbow had brought her to. Her head hung tiredly, her bookworm lifestyle wasn't exactly all that well versed for endurance. She leaned forward and close to Rainbow, she gave him a kiss on the lips, which he eagerly returned.

Once she broke away from the touch, she whispered in his ears, her voice broken by bliss and panting, "I... don't know how much... longer I can last Rainbow... but I need to know if you... can ejaculate." She used up a good portion of her remaining energy to extract herself from Rainbow's cock, pleasure rained through both minds from the action.

"So... I'm going to lay down here," she said, patting the bed beside the stallion, "then you... you need to take me and finish inside, okay?"

Rainbow couldn't be more excited; he nodded in eager acceptance.

Twilight then tiredly fell down on the bed beside Rainbow. She landed with her stomach down, her head resting in between her forehooves, and her flank in the air. Rainbow got up from his place and moved behind her. He inspected Twilight for a second, her features were tired, yet her hind quarters were oh so ready. The juices from her multiple climaxes were running down her leg, as they were also dripping off his cock. Twilight looked back at the appraising stallion, she waved her tail in front of him as if to say: 'what are you waiting for?'

He grinned, and climbed up onto Twilight to mount her. He thrusted lightly, and felt his penis press against her pussy but not slide in yet. He tried again, more successful this time, putting just a few inches inside her. Twilight flicked her head back straight and arched up. He could hear her cry out from underneath him, her face was flush, her eyes tired, and her mouth was open wide with her tongue lolled out. She was panting and moaning, and sending Rainbow off the fucking deep end.

He didn't want to hurt her though, so he leaned down closer to her ears and spoke in his deep ragged voice, "If I begin to hurt you, let me know, ok?" Her ears twitched at the feeling of his breath.

Twilight couldn't be bothered to speak, so she nodded.

Rainbow took this as a signal to go ahead. He began moving slowly, thrusting gently to build up the pleasure they had before, and to let Twilight get used to his tremendous size again. Each time he thrust in, he'd go to his medial ring, then start to move back out. Twilight moaned loudly with each movement, letting Rainbow know he was doing a good job.

Then, once he believed she could take it, he drove in passed his medial ring, and slowly pushed deeper and deeper inside her. Both ponies let out a long, slow moan as the pleasure of the action began to overwhelm them. Eventually, Rainbow couldn't move any more, his size didn't permit him to bottom out completely, he had maybe three inches left, but he wasn't going to push it.

The room was still, they just basked in each other's warmth for a moment, letting the sounds of panting fill the room. Soon, Rainbow began to move once more, he kept his thrusts deep and quick inside of her. Never moving passed his ring, and never going too deep inside her. He gyrated as he did so, sliding against as much of Twilight's nerves as possible, sending an overload of pleasure into her mind. He sped up, his thrusts became more drawn out before pushing back in, letting his medial ring glide over her aching pussy.

Twilight let out a series of short gasps at his motions. It was a short while of this before Rainbow started to draw out completely before diving right back in. Causing him to moan through clenched teeth, and her to moan through open mouth. Faster, he thrust into her, sliding deep into her and pulling himself out. He was like a piston in a very well oiled machine.

Twilight screamed between pants as another orgasm wreaked havoc through her body and mind, the waves of pleasure only splashed in tandem to Rainbow's thrusts as he pushed and pulled in her with the added traction of her spasms. He sped up. He began letting out short breaths of air through his nose as he pumped in and out of Twilight with feverish pace.

He grunted out every breath, the air pushed down and slid off of Twilight's sweaty body. Her neck was bent back as much as the powerful stallion on top of her could allow, her mouth was open and she was gasping for breath. She was panting as though she was running. She knew it was only a short while ago that she came, but regardless, she could feel the pleasure amounting again. As Rainbow pumped in and out of her, she ended up losing all thought and all worry, she had no concerns aside from the gargantuan hunk of meat being shoved inside her. Her wings flared out and brushed against Rainbow's side as she gasped and moaned. Her voice reaching a crescendo of screams and pleasure.

As he charged inside of her, Rainbow could feel his testicles begin to tighten. They swung with the motion of his body, they flew up and slapped himself lightly on the part of his dick he couldn't fit inside her. The pleasure began welling deep within his stomach and hurriedly spread throughout his body. He was cresting upon the cliff to climaxing, he could feel himself tapering on the edge. With one final push inside Twilight, he jumped off the edge of the cliff and landed in a pit of ecstasy. With the sound of another strained pleasurable cry from Twilight, he knew he brought her down with him, once more pushing her into a ocean of euphoria.

The dam broke. His penis pulsed as rope after rope of his cum splashed inside Twilight. Filling her with his potent seed. His penis flexed again and again, pushing more of his cum out of it and into Twilight's womb. Eventually, the spasms slowed as he rode his own wave of pleasure down back to earth. He was spent, and by the looks of Twilight, she was completely discharged.

He slowly pulled himself out of Twilight's aching pussy, one last spike of pleasure ruptured through both of them as his penis popped out of her, letting out one more glob of cum as it twitched. His seed fell out of Twilight's entrance slowly, the liquid being far too much for her to contain. He picked up Twilight by the flanks, an action that expended more energy that he believed he had, and pushed her rear up further onto the bed, letting her tired body rest from the pounding it had received.

Rainbow wasn't fairing much better, he felt like he ran several marathons, all at once, all while carrying several tonnes of lead on his back and dick. He fell and rolled into the bed to lay next to Twilight, who had rolled over to allow him to fall in bed easier. They were both thoroughly exhausted. Once he was settled on the bed, he reached over and pulled Twilight close; leaning in by spooning her with his softening penis. He reached his head up and gingerly planted a kiss onto Twilight's cheek, causing her to smile through her tiredness.

Before they both departed into the land of dreams, Rainbow heard Twilight mutter something. It was with a breathless, tired whisper that Twilight mumbled her last words before she departed into a blissful sleep.

"Experiment... Successful..."

Rainbow laughed softly under his breath and hugged Twilight closer. She sighed from the close contact and leaned back into Rainbow's embrace. He breathed in her scent one last time before drifting off into a restful slumber.

Author's Note

Upon the counter, near the bed, a single uneaten hayburger sat, alone, with no one awake to eat it.

That poor hayburger.

Well, how about that, the main chapter to my first (technically first and a half) clopfic, featuring actual clop this time, about 2600 words of it to be precise.

And it's from my humble desk to you, my dear reader, that I give you my work of writing, I hope you enjoyed.

Oh, and before you say it, the swapping between pronouns at the start was completely intentional.