"You're not breathing right," Rainbow Dash called to me from across the weight room.

I would have responded if I wasn't holding my breath as I struggled with the weight of the barbell in my hands.

Every Saturday, Rainbow Dash would walk into school, completely alone, and use the fitness room in private in order to keep herself in peak physical condition. Nobody else in the school had the privilege to come and go into the school building as they see fit, but Rainbow Dash managed to persuade Principal Celestia and Vice Principle Luna to give her a spare set of keys to the building (probably due to the fact that she helped save the entire class four times now).

But today, for the first time, I actually joined her for the day, bringing the total number of occupants in the school building to two. Just me and Dash.

When we first walked into the weight room, she gave me a quick crash course on the proper methods of weight-lifting. Apparently, the first rule was to not put too much weight on the bar. As self-explanatory as that sounds, a lot of people accidentally break that rule, according to Rainbow. She said that you should try to set the bar with enough weight that you can pump out at least eight to twelve slow reps before getting tired. Apparently, it doesn't benefit your body very much to load the bar with an amount of weight that you can barely lift, especially if you don't have a spotter. That all made perfect sense to me.

The second weight-lifting rule, however, was a bit more of a surprise. Apparently, there is a proper breathing technique when you lift. You're supposed to inhale while you lower the weight, and exhale whenever you push the weight up and away from you. For some reason, that just felt unnatural to me. I kept subconsciously holding my breath whenever I lift the weights upward, and then I quickly inhale and exhale when I lower it. Apparently that is incorrect, as Rainbow Dash had just pointed out to me for the third time of the day.

I forced myself to breath in the "correct" way again, and continued my bench presses until I made it to twelve. My arms were getting sore from their exertions by that point, constantly crying out for me to stop. But, I knew from the start that weight lifting wasn't supposed to be pleasant, and I felt like I could do a couple more. So, I ignored the burning feeling in my biceps and made it to fifteen reps before my arms started to really hurt.

Honestly, I may have pushed myself too far. I was actually struggling to put the weight back on the bar and wondered if I might have to yell for Rainbow Dash to run over and help me.

But, with no small amount of strain, I put the barbell back on the rack and flopped into the bench I was laying on, taking deep, laborious breaths in the aftermath of my completed set. There were only fifteen pounds of weight on each side of the bar I was lifting. Honestly, I felt pretty pathetic, struggling to lift only thirty pounds of additional weight. But, I reminded myself, the bar itself was forty-five pounds, meaning that I was benching seventy-five pounds in total.

But it still looked light, with only those two small weights on each side of the bar. I knew that it weighed seventy-five pounds, but it didn't look impressive in the slightest. I'm sure that Rainbow Dash could probably bench double the weight that I could, and Applejack could probably triple it, even without her geode.

I made a mental note not to take too long of a break and looked over towards Rainbow to see how she was doing.

She was working the leg press in a loose tank top, a tight pair of gym shorts, and of course, a familiar blue rock around her neck. Her navy blue tank top stuck slightly to the growing amount of sweat on her body. Her breasts only had the slightest curve to them before the rest of her chest completely flattened out further down.

I actually asked her once if her bust size ever bothered her. She firmly answered "No," because, in her own words, "I had to choose between being fit or being pretty, and I chose to be fit. Because, unlike beauty, fitness actually has a point to it." I knew that she meant every word of what she said, and she had a body to back it up.

Her sleeveless shirt showed off every inch of her athletic arms. Every muscle bulged and rolled subtly underneath her skin, like a landscape of hills and valleys running down her body. But her pecs didn't swell hugely outward to the point where it was distracting. She didn't have Bulk Biceps' arms; she had the picture-perfect image of an average female fitness model; her muscles were smooth and feminine, but undoubtedly strong enough to kick your ass at any physical contest you dared to challenge her to.

Past her arms and her loose top was a pair of tight, form-fitting sweat shorts covering up only a small part of her thighs. Like her arms, Rainbow's legs had features that were practically the polar opposite of standard feminine beauty. Instead of being soft and curvy, her legs were just like her arms; long, hard, muscled, and without a single gram of fat anywhere to be found. As she continued to press hard against the two hundred fifty pounds of weight on the machine, the muscles in her legs expanded and contracted rhythmically beneath her skin. I couldn't help but stare at her powerful lower body pushing against an amount of weight that was far beyond what I could ever do. I let myself get briefly distracted by the sight of the substantial amount of lead being pushed away by the fastest set of legs in the school.

I started to feel a tightness inside of my shorts. And unfortunately, I was wearing a very flexible pair of gym shorts, so the bulge could not possibly be any more noticeable. I went back to my weights, praying that she didn't notice. Maybe, I hoped, she would be interested in helping me... "get rid of it," but I didn't want to go there just yet. The topic of sex had never come up in the couple weeks we've been dating, and I was fine with keeping it that way, at least for a while.

"You ready to switch yet?" Rainbow asked.

"In a minute," I answered as calmly as I could. "I think I can do one more set." I then immediately took the weight off of the bar, trying to keep my mind off of Rainbow's body long enough to go limp again.

"I think you should stop your bench presses for now," Rainbow argued, already walking over towards me. "You've done enough already, and if you overexert yourself, it will really suck, trust me." I felt like the weight that was in my arms was significantly heavier than it was before as Rainbow Dash stood by my side, her 6' 1" frame looming over me.

She was right, of course, but I just needed to act like it was fine until I could hide my boner away. "I'm not overexerting myself," I lied. "I got this, trust me."

Rainbow Dash put both hands underneath the bar I was struggling with and said "No you don't. Now let go, I'll put the weight back."

"Just help me out, you don't need to do it yourself," I hissed through clenched teeth.

"Let go," she commanded.

So, I did. I took my hands off of the bar completely and watched as Rainbow Dash curled the massive weight that I was struggling to bench. Her face scrunched up slightly as she lifted the hefty weight up towards the rack. It clearly wasn't an easy feat, but she was doing it.

The sight of her athletic arms lifting such a heavy weight from such a sub-optimal position started to make me hard again. Once the weight was back safely on the stand, she flashed me a victorious smirk.

Then, her eyes shot to my groin.

"Well what do you know?" she asked with a downright predatory smile. "Did you like that?"

"Uuuuuggggghhhh," I groaned in embarrassment. "Shut up. I can't help it when that happens."

"You can't help it around me, you mean," Rainbow Dash grinned.

"Let's just switch spots already," I suggested, already sitting up.

Rainbow Dash's hand flashed out on top of my chest, and slowly pushed me back down. "Actually..." she thought out loud as she stretched a leg out over me, straddling herself over my prone form. "While we're here, why don't we try a different kind of exercise?"

...

Holy shit, is she talking about what I think she is??

Rainbow Dash took off her necklace and dropped it onto the floor. The gesture, combined with her words and body language were completely scrambling my brain.

She's talking about sex. She has to be! ...No, calm down, she's just removing her jewelry... Probably just to make this perfectly normal exercise more comfortable. Yeah, that makes sense!

Then, Rainbow Dash took off her shirt.

Fuck me, this is really happening!

I barely even registered the black sports bra covering her upper chest, because my entire brain was focusing entirely on the fact that she had abs.

Like the rest of her sexy athletic body, Rainbow Dash's abdominal muscles weren't dramatic enough to be distracting, but they were undeniably there. A small hint of a classic six-pack sat subtly below the skin of her firm, lithe naval. I only sat there in shocked silence, my pulse pounding harder and harder as she pulled my own shirt up over my body, then pulled down my pants, and finally my underwear. Then, she began to undress herself, pulling down her shorts to reveal her rock-hard, naked thighs. Then, with little ceremony, she dropped her underwear to the floor, as well.

Her black, tightly-fitted sports bra was now the only piece of clothing between the two of us. I tilted my head up just a little bit in order to properly drink in her nearly naked figure, while being careful not to smack my head into the weight that was still hanging over me.

"Let's get rid of this thing," Rainbow said, looking towards the weight in question. And then, once again, she put her hands underneath the bar and picked it up from her standing position.

...Only it was so much sexier this time, due to her having shed most of her clothes while she did it. Again, she gritted her teeth and her arms locked up at ninety degree angles as she swiveled her body to the side. While her arms continued to hold the weight, her core started to tense, as well. Without any shirt or shorts covering her up, I could clearly see every muscle of her body subtly shift around underneath her exposed skin as she moved the metal bar aside. Her biceps, triceps, abdominals, and leg muscles all tightened up, bulging slightly outward as she conquered that weight that I was struggling so hard with earlier. Once she had the weighty lump of lead in a safe position, she quickly set the weight down onto the floor with a loud thud.

Panting slightly, she looked back to me and locked her eyes with mine for only a moment before she sat her naked ass down on top of my naked thighs. My heart was running wild at the feeling of her firm rear pressing into my legs. Then, she lifted her hips up slightly and positioned her slit directly over my now very erect dick.

"I hope you can handle more than twelve reps of this," she growled. Then, without any warning, she dropped her entire weight onto the bench at once, impaling herself all the way down my rod.

"Oh fuck!" I cried out in shock. The sudden shift from 0 to 100 nearly made me see stars. "Don't you want to... you know, slowly ease into this?" I wheezed.

"'Slowly ease into it?'" she repeated sarcastically. "Do you even know me?"

She lifted herself off of me, then quickly shoved her self all the way back down again. I shuddered violently inside of her. She was inhumanely tight. Her entire lower body was sculpted into a physique that was specifically designed to have as much strength and dexterity as possibly. And I could feel the fruits of her labor. Her slim hips once again lifted her streamlined butt off of my dick and them dropped back onto it, causing yet another wave of pleasure to rock throughout my body as my penis was squeezed tightly between her powerful thighs.

Her thrusts started to slowly pick up speed. Her upper body did not move an inch, because it didn't need to. Her hips, thighs, and abs worked together to spear herself on top of me again and again. Her legs moved like steel pistons, ramming her lower body into mine faster and faster.

Suddenly, a pair of blue wings materialized behind her in a flash of white light. I was so lost in the sensations of being inside of her, that I barely noticed. I also didn't notice that her thrusts had already reached a level of speed that should not be physically attainable by the human body. It happened so gradually that I didn't even notice the fact that... well...

...

...

It's difficult to describe, what it felt like. Because, the very nature of describing something requires that the person you are explaining it to has had a similar experience for him/her to connect the description with. If I had said that something tasted like chicken, but the person I was explaining that to had never tasted chicken before, than it would end up being very difficult to describe exactly what I was tasting.

In this case, it's difficult to describe what Rainbow Dash's body was doing to mine, because no other man has ever felt a sensation like it before.

Her powerful leg muscles drove herself all the way down my penis, until her firm, naked crotch rammed into mine. The inner walls of her vagina wrapped tightly around me as it viciously forced its way all the way down, until my whole entire cock was smothered in the walls of her intimacy. I felt the tip of my dick penetrating her, shoving its way even further inside of her magnificent body. Then, without using any of the momentum we were building, she yanked herself off of me, sliding all the way back up my dick until it was just barely touching the folds of her pussy lips. Then, she thrust her hips back down, engulfing my throbbing member and repeating that wonderfully sensual process all over again.

Now...

Try to imagine yourself feeling all of those sensations, over and over again...

At a rate of approximately thirty times per second.

Rainbow's entire lower body was moving like an incomprehensible blur, her hips slamming into mine at a speed that couldn't possibly be followed by the naked eye. The feeling of being ruthlessly pounded by the incalculable speed and force of her superhuman pelvis, the sight of her exposed body moving in a way that no other girl can... It felt like my brain was about to shut down. I was being completely and utterly overwhelmed by the indescribable feeling being fucked at superhuman speed by a star athlete in peak physical condition.

While she continued her aggressive, lightning-fast assault on my penis, her strong arms reached around the back of my head and pulled me in for a kiss. Her tongue forced its way into my mouth and-

Her tongue was moving at super-speed, too!!

Her tongue was wrestling with mine, then it was on the roof of my mouth, then it was on the inside of the right cheek, than the left cheek, then it was pinning my tongue to the floor of my mouth, than it played with my cheeks again. And it did all of that in the span of less than a second.

She attacked the inside of my mouth with a speed and force that is simply impossible for any other woman to even comprehend, let alone achieve. And all while her naked, super-powered ass continued to ram into me over and over again with the speed and force of an industrial jackhammer. Her nude lower body was grinding me further and further into the padded bench I was laying on. I felt myself getting helplessly buried into the padded bench by the otherworldly power of her bare, superhuman hips.

I came in violent spurts; I didn't even know that I was close, but I suddenly found myself shooting my sperm as deep as I could into her. It was just too much, too fast. I nearly blacked out as I was rocked by the most sudden and violent orgasm that I would probably ever experience. Even though this was my first time, I could say that with absolute certainty that I would probably never experience anything like it again.

She didn't stop moving, either. Her hips continued to rocket up and down my erupting penis like a high-powered industrial machine and her mouth stayed locked with mine as I unloaded every ounce I could muster into her perfect body. Soon, however, I ran dry, and my head suddenly started to feel very heavy after the intensity of what I had just experienced. I would have outright collapsed if Rainbow wasn't still holding my head close to hers and preventing me from falling to the floor. I felt so drained, so completely and totally exhausted.

Her super fast movements slowed down the moment she saw me go limp. The constant pounding of her hips settled down until they eventually returned to a normal human pace, then stopped altogether. Soon, she too was sitting still in the aftermath of our first time.

So much incomparable pleasure had happened so quickly, that I only now realized that the sex lasted less than twenty seconds.

"I'm... sorry..." I managed to squeak out between labored breaths. "I should have... lasted... longer..." I panted. "So sorry..."

Rainbow Dash pulled me in for a firm hug, pressing my naked torso into the smooth contours of her abs and into the firm fabric of her sports bra that she had never even taken off. The realization that she still had some clothes on distressed me even further. I couldn't even hold out until she was completely naked. How embarrassing is that?

Rainbow Dash didn't seem to be judging me, though. She simply wrapped her sturdy arms around me even tighter and pushed her face into mine until our noses touched.

"Don't worry about it," she purred with the most sexy, arrogant smirk I had ever seen on her face. "I doubt that any guy could last very long inside of me."

If you notice any errors, please leave a comment so I can fix it for future viewers. Constructive criticism is also welcome.