Gilda’s claws smacked onto Rainbow Dash’s ass, sending the entire thing bouncing and wobbling She was balls-fucking-deep inside of the pegasus’ tight, fertile cunt, and it felt fuckin’ great.

“Ugh, fuck you, Gilda. No need to be rough,” Dash panted between deep, strained breaths, fingers clinging to the bar of some sort of machine in front of her.

The gryphon was taking her doggy-style in the middle of a gym, and Dash just barely managed to keep up with Gilda’s animal-like, relentless thrusts. She had to throw herself forwards, and then slam her ass back again just to meet Gilda half-way, and cause another meaty, obscene SMACK to ring through the exercise hall.

Fuck, she hoped that machine she was holding on to was sturdy enough to withstand this treatment. The last she could use right now was a weight falling down and punching a hole into the floor.

“Eh. Can’t help it, Dashie. I could’ve fucking sworn that...” SMACK. Her hand battered against Rainbow’s fat ass yet again. “...that your ass wasn’t nearly as fat as this a few weeks ago. How come? Been slackin’ off, girl?” She grinned.

Dash panted, her knees wobbling dangerously. Sweat was dripping from her forehead, and her flimsy workout-shirt was utterly soaked. A foamy concoction of mare-juices and pre-jizz was dribbling down her thighs. She let out a huffy grunt.

“Yeah, and you weren’t nearly as much of a cocky bitch before you got that...that fat, perfect, addictive fucking cock.” She was catching her breath, and continued, thighs quivering around the gryphon’s immense spire. “Look, it’s really fuckin’ hard to keep my macros straight while you blow a gallon of your stupid, slimy jizz down my throat every day.” She panted. “I’m supposed to be cutting right now, not bulking!”

Gilda grinned. She wrapped Rainbow’s tail around her wrist. Their rhythm had slowed down during the chit-chat, but she was getting close. As for Rainbow? Hah. Gilda knew that slut had already gotten off twice, and was probably approaching her third peak of the day.

“I fucking bet. Can’t help that you’re fucking hooked to my dick, Dashie.”

Dash was about to stammer, stutter something about how she was totally in control of herself, and could stop any time she wanted, and that those many, many hours she’d spent on her knees, worshipping Gilda’s cock meant nothing, when Gilda yanked at her tail and began to hammer into her with increasing, reckless speed.

Smack. Smack. Smack.

A mere few seconds later, Gilda’s swollen jizzkegs tensed up, and released another immense, belly-bloating load. The first rope of dense, sperm-packed semen battered into Dash’s depths, and the pegasus moaned, and squeaked like a little girl. “F-fuuuuck...” Her knees were weak.

Gilda let out a pleased, satisfied grunt as her best friend wobbled a little, holding on to her own belly as Gilda's cum burst, and splattered into her to the point that it felt like her belly was about to start swelling and sagging.

Shortly after, the gryphon’s massive knot popped from Dash’s pussy, still dripping with cum. She grinned, staring at Dash, who just barely managed to keep on her hooves.

“Time for a shower, huh? You’re not struggling to keep up, are ya?”

Dash stumbled after her, slowly regaining her composure. “Fuck no. What, you think I can’t handle it?”

Gilda chortled. “Nah. Just pullin’ your wing. You’re a beast, Dash. 80% muscle. 20% awesome. If I ever fuck you hard enough that you walk bow-legged for one week straight, I’ll look for another wizard to help me get rid of this thing.” She pointed at her dick. It twitched lazily. The foggy scent of musk surrounded it.

Dash shrugged as they entered the showers. “Yeah uh, good luck with that. If Twilight couldn’t figure out how to deal with that thing, you’re fucked. She’s the best. You’re stuck with it, unless you wanna take your dong straight to Celestia and wave it in front of her face. Which uh...probably a bad idea?”

The two laughed.

Gilda turned the tap, and ice cold water washed over them.

Not too long after, a very satisfied Rainbow Dash stepped out of the gym—still a little bow-legged—and Gilda returned her attention to the benches and weights.

Time to put these muscles to work.

She’d barely gotten really into it when the door chime rang, and a few ponies entered her place of worship, a veritable church of plates and iron.

“Look Scoots, I told ‘ya, she’s a gryphon. She can’t get ya pregnant. Now stop fussing, we all agreed to this yesterday...”

“Shhh! She’s gonna here you at this rate...”

Too late. Gilda furrowed her brow as fragments of words reached her. She’d not gotten everything, enough to see where this was going.

She was facing away from the group, a few beads of sweat staining her browfeathers. The barbell weighed heavily on her grip. Her legs muscles pulsed with strength. She kept her spine straight, and her wings flared out. This was the good stuff.

She knew they were there, caught on their way in, stalling, and now gawking at her rippling back muscles. It’s not like the flimsy exercise-bra she wore concealed much, and that wasn’t even getting into how her massive, flaccid beast of a gryphon-dick stretched out her shorts.

Frankly, she had no fucking idea if whoever had just waltzed into her gym had any idea what proper form even looked like, but hey, she fucking loved to show off. Her muscles strained as she set the weight down, then lifted it again. Heavy, deep breath. Her heart pounded, blood rushed through her flexing muscles. The scene repeated twice, then the barbell remained on the floor. She brushed her hands against each other, and grinned.

Someone mouthed a “Whoah...” behind her.

Gilda flexed, stretched, and turned around to be greeted by three flushed fillies, barely old enough to drink, dressed in a few flimsy straps of fabric that were pornographic enough some gyms would kick you out faster than you can complain that technically all of your private bits are covered. Gilda just cocked a brow.

Right, she’d definitely seen these around before. The yellow one, the white one, the orange one. Troublemakers, but she wasn’t exactly one to talk, especially remembering some of her past trips to Ponyville.

Feeling the gryphon’s gaze rest upon her, the red-maned yellow one finally mared up the courage to speak. “Hey! You’re uh, Gilda, right?”

They tensed up as she stepped past them to the counter, grabbed her bag of protein powder, and poured herself a shake. “Yup. And you are?”

“Uh...Applebloom! And these here are my friends Sweetie Belle and—” “—Scootaloo!” Scootaloo interjected.

She eyed them up. Not going to lie, they were pretty fucking hot, but Gilda didn’t believe that they were here to work-out. Not even for a single second. They’d laid it on thick with that getup. Jeez. Sweetie Belle was wearing a skirt short enough it might as well be a freaking belt. Scootaloo wore a fucking bikini top. It was summer, but this here was a gym, not the beach. And Applebloom? Jeans shorts. If you’ve ever worked out in jeans, especially jeans shorts short enough to ride all the way up your ass, you’ll know that it’s not a great experience. Jeans just isn’t nearly flexible enough a material.

Ugh. And the fucking make-up Sweetie Belle had put on. Sweet Celestia, she could feel her dick just twitching seeing that on her, but it looked pretty out of place in a gym. She’d probably picked up a few tricks from her sister.

Yeah, they weren’t the first thirsty mares who’d showed up to get railed, but if they really wanted it, she’d make them work for it. Push them around a little first. See how they’d react. Not to say her dick wasn’t into it, but they looked pretty inexperienced, and she wasn’t looking to get into anything with girls who assumed that a casual fuck in the gym meant this was going to be some sort of long-term relationship.

She grinned to herself. Pushing them around a little was the least she could do, they were interrupting her workout.

Gilda shrugged, fully aware that even now she was flexing, and showing off her muscles. “A’ight, cool. You can find the weights yourself, right? Good.” She took a deep gulp of her shake, and lumbered back over to her barbell, the gaze of three dumbfounded fillies following her.

“H-Hey! We were kinda uh...hoping for some, uh...personal training?” Apple Bloom yelped after her.

Gilda lifted a dumbbell off the floor, and weighed in her hand. “Yeah? Like, advice and shit?”

“Y-yeah, that! Ow!” Scootaloo rammed her elbow into Applebloom’s side. “What she meant is that we were hoping for something way more hands-on, like, personal training with someone big and strong who can show us how it’s really done. We need a deep, hard and thorough workout that will leave us sore, if you catch our drift.” Scootaloo’s voice was dripping with lewdness by the end of the sentence. She even winked at the gryphon.

Applebloom was beet-red, and mumbled something like “Where the hell did you take that from?”, to which Scootaloo responded with “Look, I watched like one or two ‘films’...the mares always talk like that before the action start, duh...What, don’t tell me you’ve never seen porn? Okay, y’know what, the next time we meet up in the clubhouse I’m so bringing one of Dash’s porn flicks.”

This time it was Sweetie Belle’s turn to elbow-ram them, mumbling something to direct their attention back to their target. And what a sight it was.

Gilda waited with her response. She lifted a dumbbell, flexed it, leaving the near-salivating girls in suspense. She wouldn’t be surprised to see puddles between their legs at this rate.

“Hmmm...”

They were brimming with anticipation.

Then Gilda snorted. “Nah. You know that I’ve got better things to do than uh, fucking a bunch of fillies who’re trying really fucking hard to come off as trashy sluts, right? I know it’s heat season around here, but jeez.”

That rejection came like the crack of a whip. It was almost comical: Three young mares in a row, first confident, now flinching, their ears and tails drooping in unison. Their lower lips wobbled dramatically.

“AWWWWW...!”

And then the quibbling and infighting started. Gilda watched in amusement.

“Aww, I really thought she’d be into us.”

“Look, I told you you’re laying it on way too thick with that outfit.”

“Pah! That’s rich coming from you, did you look into a mirror this morning?”

“Uuugh, stop it guys. I really really really don’t think I can handle another week of this, I swear I’ll go insane, heat is the worst...”

Just as the dejected mares were about to take their leave, Gilda stopped them. She cleared her throat, and they stopped dead in their tracks.

“Get back here.”

Within a fraction of a second, they were at her paws. “Y-yeeees? You’re willing to give us a chance, right? Right?”

Gilda shushed them.

“We make a simple deal. You follow my rules. I fuck you hard enough to see stars. When I tell you to get down onto the floor and do push-ups, you’re there before I can even blink. In other words, I call the shots here. Also, and this is important so listen up, this ain’t a personal thing. I’m not going to be your fucking girlfriend, got it? I’m not gonna kiss you, take you out for dinner, or call you tomorrow morning. Got it?”

They nodded.

“Good. Now get your tits out.”

Author's Note

More to come tomorrow!

Question of the day: Do you like this sort of 'in medias res' start, or do you prefer if stories start out slower?