Stretch Goals

Stretch Goals

By Danath

Content Warning: futanari dom, male sub, femboy transformation

* * *

The heavy steel bar clanked back onto the rack with a loud metallic clatter. The attached weights were heavy enough to be impressive - at least in a casual gym like this one, the kind of gym where half the people spent 30 minutes on the treadmill while staring at their phones, then soaked in the hot tub for another 30 minutes before going home. Milt was a little more dedicated than that. Sweat poured from his face and soaked into his sweatshirt, causing the fabric to cling to his well-developed shoulders and pecs. He sat up and grabbed his towel, wiped himself down briefly, then grabbed his water bottle for a swig.

Milt wasn't the biggest guy in the gym only because of his height. He figured if he had an extra few inches, he'd be just as big or bigger than the others. The competitive nature spurred him on, leading to his intense workouts that aimed to develop his muscles.

He took a few deep breaths to ready himself, then laid back down and grabbed the bar.

His loud grunts as he powered the bar back up into position, trying to do just a few reps at his max weight, rang out even louder than the clanking bar or the other machines and free weights in use around the gym. Even the people in the separate glass-walled yoga studio room were turning their heads once in a while. Milt was unaware; he only focused on one thing at the gym. The yoga studio glass was meant to be soundproof to prevent just this sort of thing, but Milt's power-grunts were on another level.

Eventually, the yoga instructor herself came out. She wasn't a gym employee and so didn't wear the typical employee uniform. Instead, her outfit was several layers of flowing, draped, gauzy fabrics with bright floral prints atop a dark black unitard. The effect somehow both disguised and amplified her hourglass figure and impressive chest. The bodysuit clung to her up to her neck, but the draped fabrics hid anything but the occasional glimpse of a curve or bulge of nipple. Her shoulder-length black hair was pulled back in a loose ponytail, and a pair of loose flip-flops kept her feet off the floor.

"Excuse me," she said, leaning past Milt's spotter to look at the lifter directly. "We're having a class next door and unfortunately your lifting is just a little distracting for my students," she said, trying to sound as cheerful and non-confrontational as she could. "I'm Kelly, the instructor. Would you mind doing other exercises until the class is done? We'll only be a half-hour or so. You're welcome to join us if you'd like - many bodybuilders use yoga to stay flexible and limber. It can help your muscles stay loose as well. What do you say?"

Milt's natural instinct was to tell her "no" and go back to lifting. But that bit about improving his flexibility and loosening up his muscles... that tickled Milt's fancy. He was willing to try most anything in his quest to get big. And it wasn't as though he were concerned about what people might think of him joining a yoga class. If he cared what people thought, he'd have quit based on the jerks who discouraged him when he first started going to the gym, telling him he was too short or had bad form or whatever. Well, he could fix his form at least, and did, and now he was really packing on the weight.

"Uh... sure," he said after a little more deliberation. "Sorry about the noise."

"Oh, that's okay," Kelly said. "I like noisy guys. Means they're working hard, right? Anyways, what's your name?"

"I'm Milt."

Kelly licked her plump lips and brushed a few stray strands of hair from her face. "Well, Milt... are you coming?"

She turned and headed for the side room, hips swaying with hypnotic grace amidst the feathery, semi-transparent fabric draping around her. It was a very hippie-dippie sort of outfit, Milt thought, but it looked good on the mature, confident woman. She was probably, what, fifteen or twenty years older than him? He was only 22 and had been working out seriously for about three years.

Still, his competitive spirit drove Milt right through the glass door into the yoga studio. Anything that could help him in his quest to improve. Only after he took a moment to wipe himself down again with a dry towel and change his shirt for a fresh one, of course. Even he recognized what he could end up smelling like after a workout. While he viewed it as a sign of having worked hard, most people saw it as him being far too ripe.

Settling into the back corner on a bright purple yoga mat, Milt watched as Kelly returned to the front of the room.

"Alright, did everyone practice their poses? Let's run through a few basics again to welcome our newest student in the back there," Kelly said, smiling as everyone clapped politely. "First up..."

Milt found it surprisingly difficult to keep up. There was more to it than just bending over and trying to touch his toes. He didn't get most of the terminology - it went right over his head - but he understood the point of each stretching exercise thanks to Kelly's explanations. She even came over to personally adjust his form a few times, which he appreciated.

"Alright, everyone, great job!" Kelly said. "That's going to be a wrap for today!"

Milt stood and rolled his shoulders, then flexed his biceps and twisted his hips around in each direction. He felt surprisingly sore, like he would after a really good workout, but also surprisingly loose and limber. Maybe there was something to this yoga stuff after all, he thought.

He was almost out the door when a hand grabbed his forearm, stopping him.

"Oh, Milt! Really good posture control," she said. "You picked up the basics really quickly."

"It's kind of like knowing the right way to do all the free weight lifts," Milt said. "But I can definitely feel it."

"Good! I hope we'll see you back again soon," Kelly said. "I'd love to keep getting you good and stretched out!"

After a few more pleasantries, Milt went back to finish his workout, but he cut it short. The yoga had really taken it out of him, and he ended up going home early to recover.

The next time Milt was at the gym, there was another yoga class with Kelly at the front. They'd only just begun, so the bodybuilder made a split-second decision. Rather than go through his usual routine and possibly annoy Kelly and the students again, he'd join them. His gym membership covered the classes anyways, so he may as well take advantage.

"Milt! Great to see you!" Kelly said upon seeing him enter the room. "Grab a mat and join us - we're just getting warmed up."

She was wearing a flowy bodysuit with drapery, this time in two types of purple fabric. She was so exotic and mysterious. It was clear that she had an amazing body. Milt spent much of his time when his eyes weren't closed watching Kelly intently. She must have had a great bod from how she moved and the fabric pulled and the occasional glimpses of the unitards she wore underneath, but it was frustrating not to know just how well-built the instructor was. Milt couldn't help the fluttering in his stomach whenever she sternly corrected his posture or encouraged him to stretch just that little bit more. She was mature, friendly, no-nonsense, and was always so helpful during class.

He almost wanted to ask her out. Would that be inappropriate? He'd hate to stop going to the yoga class if she said no and things got awkward. Better to wait for now, he reasoned.

The full class experience was even more intense. Milt hadn't realized he could stretch in the directions some of the poses and movements got him to go. More than once he had to stifle a grunt as he felt his legs or arms or back protesting the sudden tension.

"Keep it up, Milt! Can you believe he's just a beginner? This is his second class!" Kelly said. She was dropping compliments to every student she passed, but she lingered near Milt to correct his form, adjust the positioning of his arm or leg or something.

Milt counted himself lucky she was such a dedicated teacher for a random gym yoga class. He was learning a lot for his second class.

And by the time it was over, he learned that yoga was exhausting. He was flat on his back after the rest of the class left still recovering, trying to control his breathing. Kelly appeared and smiled down at him from above. She was a few inches taller than he was anyways, so he really had to look up at her and try to keep his eyes from drifting to her chest.

"You're a natural!" she said, grinning. "In a few months you could probably teach your own class."

"Ha... not likely," Milt gasped. "It's a really good workout, isn't it?"

"It can be if you're not used to it, but the more you do it, the better it's going to feel."

"Yeah," Milt said, sitting up slowly with a sigh. "I can tell. I don't think I'm gonna work out today after this. I can barely lift my arms."

Kelly nodded sympathetically and helped him to his feet. "Poor Milt... but you're a real trooper for hanging in there. You made it through the whole class today and that's no mean feat."

"Thanks, Kelly."

"Alright, Milt. See you next class."

Kelly's palm spread open and delivered a playful smack to Milt's backside. The spank made him jump, then made him bite his lower lip to stop the sudden moan at the surge of pleasure he felt following the removal of her hand from his glutes. He must really be tired, he figured. Overstimulated, probably. Definitely best to skip the workout, especially considering how hard he was getting in his shorts from the smack to his booty.

A few weeks passed. Milt continued to attend classes, altering his routine so he could go to all three that she held each week. He didn't work out as much anymore. Yoga took up more and more of his time. He even did yoga at home. It was so easy - he just needed a mat and some gentle music, maybe a scented candle if he wanted to get really fancy, and he could do all the stretches and poses and everything else right in his living room.

Of course, ignoring his training meant he was losing some mass. That, he rationalized, was normal. And not a bad thing. It meant he could gain it all back and then some later by improving his foundation. Start over all the way with the basics, he figured, and he could make his body even better than before.

So of course there was no reason to get worried that his abs faded a bit, or that his shoulders narrowed. His thighs and calves were just as strong as ever. Nobody could accuse him of skipping leg day, at least. His biceps were definitely smaller, but that was to be expected, he thought, as they were more among the more decorative musculature along with the abs.

Today, though, was special. Today was his first one-on-one session with Kelly. She asked him about it a week ago and he readily agreed to pay for private tutoring. He was getting so much out of yoga that it just made sense. Today, she was finally coming by for the lesson. Milt lived alone in his apartment and normally his place was a bit of a mess, but he made an effort to clean up. He threw out the empty protein powder bottles, stacked his bodybuilding - and now a few yoga - magazines neatly in the corner, and gave everything a good wipedown. He even made his bed, though he doubted she'd see the inside of that room. Maybe if he got lucky. He'd never had much of a thing for older women, but something about Kelly was really getting him going lately. She'd been the focus of all his masturbation sessions. He was even thinking of her as he moved the coffee table out of the way and set out some yoga mats, then double checked he had water bottles in the fridge. He wanted to make sure he made a good impression.

She arrived right on time. Milt smiled as he opened the door and was about to say hello, but stopped when he saw her eyes traveling up and down his body. He couldn't stop himself from squirming a bit under her intense gaze, until finally her brow relaxed and she smiled back at him. He didn't dare shift his gaze away from her face despite the natural impulse to want to check out her amazing tits.

"Hi, Milt. You're looking good."

"Thanks. I'm feeling great! And I'm really looking forward to today's lesson," he said, hoping he sounded as smooth as he was trying to be.

"I bet you are."

Kelly smirked and walked past Milt. Her heavy breasts bobbed and bounced in her tight t-shirt as she entered the hallway and moved into the living room. Milt did a double-take as he realized she wasn't wearing body-obscuring draped clothes anymore. The fru-fru yoga instructor style was out the window, and instead she wore a tight black shirt with some band logo on the front, plus a pair of blue jeans that hugged her lower body and amplified the curve of her backside. She was lean, but clearly muscular and powerful. Rather than being built for size, she was built for strength - Milt could tell right away, having been around all types of bodybuilders over the years and researched all sorts of training methods. He could only see her from behind as she passed him, but he didn't mind, because what a behind it was...

Milt followed Kelly into the living room. He stared at her ass the whole way. When she suddenly pulled her shirt off, he let out a gasp.

"What?" she said, looking over her shoulder at him. "I've got a sports bra on. Relax, Milt!"

She was, indeed, wearing a sports bra. It was dark green with white trim and squeezed around her upper torso. Milt stared as he watched her sideboob jiggling from behind. And then she pulled down her pants. A matching green bikini bottom with white trim was all that covered her. The fabric pulled into her crack, leaving most of the broad expanse of perfectly smooth, taut rump exposed until she reached back and plucked the small garment free. It settled back to stretch a bit further over her round, thick backside, but only just.

"There, that's better," she said, kicking her sandals and leaving herself barefoot. "Alright, Milt. Ready to get started?"

Milt just nodded, dumbstruck. Was she coming on to him? Or was this normal and he was the weirdo for having lustful thoughts? It was hard not to think lustfully. She was such a well-built, powerful, mature woman... not normally his type, but something about Kelly made his heart race lately.

She sat down on the nearest mat and faced away from him, then gestured towards the other mat in front of her.

"Let's start with some guided relaxation," she said. "Then we'll get into some warm-ups."

"Sounds good," Milt managed to croak out.

He walked over and turned around, then sat down. Kelly already had her arms resting comfortably on her lap with her eyes closed and her head tipped back slightly.

"Alright, Milt, let's start with a few deep breaths... nice and deep... there we go..."

The relaxing tones of her voice almost lulled Milt's eyes closed, but they refocused on her chest instead. His eyes dilated as he watched her huge breasts lift and fall with each of her deep breaths. His eyes moved lower, admiring her flat, hard washboard stomach.

Then his eyes went a bit lower still and his jaw dropped. His eyes widened and his pupils expanded until his irises were mere slivers. A red flush crept up his neck and the side of his face as he gazed in disbelief at his yoga instructor's bulge.

It was clearly a dick. There was no mistaking the obvious outline in the front of the green bikini. Not only a cock, but a pair of fat nuts, each bigger than a tennis ball. Her dick was as thick as his own forearm. He shuddered as he imagined what it would feel like to wrap his mouth around the huge shaft. Or sit on it. And feel it open him. Stretch him. Fill him...

Milt's eyes were glassy and his dick was hard as steel. The strange urges and desires flooded his mind as his nostrils flared. He could smell her scent already and shuddered.

"And... release... hooooo..."

Kelly's shoulders relaxed as she exhaled and drooped over for a moment, then lifted herself upright with a smile.

"There we go! Do you feel relaxed and ready, Milt?"

Milt's eyes snapped back up from her hips. He nodded mutely.

"Great! Let's go into a few standing stretches and really get warmed up," she said.

Milt's heart thumped when he saw her breasts and dick bulge bouncing in unison, jiggling with every little movement she made while getting to her feet. It took him a few seconds, and he shamefully turned halfway around before quickly sticking his hand in his shorts to adjust himself and try to hide his erection. Had she noticed? He wasn't sure. Kelly didn't say anything, so maybe she didn't, or she was just being polite. Surely she understood the effect she had on people.

Especially when she moved in behind him. Kelly's hands wrapped around his shoulders before sliding down his arms, pausing at his elbows to lift his arms into position. Milt's eyes bugged outwards and his whole body went tight when he felt her bulge slide briefly, ever so briefly, against his lower back.

"Spread your legs," Kelly said, her voice low and deep in his ear.

Milt's legs moved of their own accord and his cock let out another shameful burst of pre-cum. He tried not to move despite the hair on the back of his neck going as stiff as his dick.

"Perfect!" she said, her voice once more bright and cheery and familiar. "Alright, let's get started. Ready? And... begin... good... keep those knees bent!"

Milt did as he was told. His cheeks burned and his whole body flushed with heat. What was happening? How could she possibly be so hung... and so muscular? She was big and powerful, just like he admired the bodybuilders who inspired him, but she was also so feminine - despite the dick, of course. Or in spite of it. Whatever the case, Milt's confused, hot feelings made his form unsteady, and more than a few times Kelly stepped in close to adjust his arms or prod at his hips to push him into a correct posture.

"Very good! Whew! You sure have a lot of stamina, even I'm feeling tired," Kelly said, smiling as she grabbed a towel and wiped herself down.

Milt, at this point, was harder and hornier than he'd ever been in his life. The smell of her scent, the rich musk, flooded his living room. The view of her sweaty, glistening muscular body as she wiped herself down made his hips twitch. Then she reached down and grabbed the front of her green bikini bottom and pulled it away from her hips. The bulge of her huge flaccid cock disappeared as she stuffed the towel inside and wiped her inner thighs, balls, and finally her huge cock in turn. She went slow, methodical, really making sure she was getting herself dry, before letting the waistband of the bikini snap back into place around her flaccid maleness once more. It was pointing to the upper right and curling over her hips, while her huge balls sagged in the center, dragging the waistband lower with their heft and size.

"We'll call it there for today, but I hope you'll schedule another lesson soon, Milty."

Milty? Milt's eyes widened. Milt was already a shortened version of Milton. Was he getting a new nickname? He didn't hate it. Especially not the way Kelly said it.

The yoga instructor pulled on her shorts and t-shirt, then headed for the door.

"See you later, Milty."

And then she was gone. Milt - or rather, Milty - dropped onto the couch, grabbed for his cock, and came harder than he ever had in life about three seconds later, and there was no way on earth she didn't hear his high moan of lust that accompanied the intense, long-delayed orgasm.

He scheduled another private lesson, of course. And then another. Then two a week. After a few months, he started to understand what Pavlov's dogs went through.

"Great form! Hold your arms just like that!" Kelly said, her voice whispering into his ear. One of her hands slid down his side and squeezed over his hip. "Good boy."

Milty's hips jerked and the dark spot of pre-cum on the front of his shorts grew slightly larger. He leaned back against her and moved his hips up and down as she held his arms over his head by the wrist. Was this really a yoga pose? Did he care?

His large backside was perhaps the most notable feature on the former musclebound shortstack. Now, it would be hard to guess that was how he spent his time. His shoulders were lean and narrow, his arms like matchsticks, his chest nearly concave. His flat stomach expanded, though, into a massive pair of hips and thighs. There was no muscle, though, just plump, firm, thick femboy booty. His wide thighs narrowed into a tight pair of calves and dainty feet.

Milty groaned as he felt her thick maleness slide down his lower back and then between his broad cheeks. Her hand pulled on his wrists, keeping his shoulders pulled back so that he was curled over her. His legs dangled at times as she humped forward.

"Let's work the kinks out of that spine, huh?"

"Y-yes! Please!" Milty gasped.

"I knew you'd like this one, Milty."

Milty moaned, squirmed as he felt her grow aroused. She'd never done that around him before, not in all the months she tutored him. His jaw clenched as he pushed himself back, forcing the bulge to travel through his clenching butt like a kielbasa through a tiny bun.

"I think you're ready for the next stage in your yoga journey, Milty," Kelly said. "What do you think?"

She was so big and powerful. He could feel her flexing muscles against him, her much larger cock, her thick biceps, her plump and heavy breasts... he couldn't compete. Of course he was ready.

"Yes, Kelly!"

"Good boy. Then suck my cock."

She twisted his wrists, forcing him to turn around. Her huge bulge pushed into his belly as she smirked down at him.

"H-huh?"

"It's easy, Milty. If you want me to keep tutoring you in yoga, well... suck my cock."

Milty's arms remained above his head, held in her left hand. Kelly's right hand wrapped around the top of his head and pushed down.

Milty gasped as he felt what was only a fraction of her strength. And then he was face to face with her bulge.

"Go on, Milty... you know you want to..."

Fingers dug into his hair while the hand holding his arms pulled forward until she was holding his wrists in between her huge breasts. Her bulge smeared across his face as she let out a happy little grunt.

"Mmmhh... months of effort... but you're gonna pay off nicely, aren't you, cutie?" she said, removing her hand from the back of his head for a moment. She pulled down her underwear and a massive half-hard dick already dripping pre-cum lurched free and speared towards Milty's face. "Well, this'll teach you to interrupt my class, anyways, won't it?"

"W-wai-" Milty gasped, but it was too late.

His cheeks bulged as his jaw stretched. Her hand returned to his head and jerked him forward by the hair. Her satisfied moans as she got each additional inch down his tight, swallowing throat filled his ears.

"Oh, fuck, Milty, I knew you'd be a tight little bitch, but damn..."

"Glrk!"

Kelly's muscles tensed as she squeezed forward, but try as she might, she couldn't quite get the last couple inches down his throat no matter how hard she pumped or thrust or pulled. By the time she dragged his face off her shaft, he was half-unconscious from lack of air and his entire upper body was covered in a sheen of sweat and pre-cum.

"Whoops, I didn't break your jaw, did I, slut? Fuck, you're good with your mouth. Look how hard you got me."

She grabbed the base of her cock and squeezed up to the top. A river of pre-cum bubbled from the fat head and dripped down over Milty's stretched out figure on the floor.

"Well, you better take care of this. You wouldn't leave a girl hanging, would you?" she asked with a cocquettish and artificial giggle. "Now let's find out just how limber you are, you sissy little slut!"

Milty's eyes closed as he felt her grab him under his knees and spread his legs apart. She pushed back until his knees were touching the floor - a sure sign he'd mastered many of the stretching techniques she taught him. Her huge cock flopped across his belly and then dragged down his own smaller cock. He almost came when she let loose a few ropes of pre-cum across his balls.

Then she shifted her grip, putting his ankles over her shoulders so she could grab his hips instead. Her lustful face leered down at him, leaning over and pinning him to the floor, as one hand guided her massive tip between his tight, virgin cheeks.

"Fuuuuuck, that's good," Kelly groaned as she forced herself past his ring. Milty's whole body tensed and twitched and he began to hyperventilate, but Kelly just leaned forward and, with a wet, juicy thrust, pumped another couple of inches into his tight, clenching ass. "Damn, I could fuck this hole for days!"

Her speed quickly increased until she was moving with rapid and jerking thrusts. Milty's shoulders bounced off the floor as she stretched his belly, completely hilting him until her balls slapped his ass over and over and over. Milty couldn't really think anymore; the pleasure and exhaustion overwhelmed him, but he couldn't stop cumming. His limp cock jerked, a measly and piddly little orgasm, but it felt as good as the first. Milty's heart beat hard in his chest as he clenched and moaned and jerked and twitched and stretched himself, hoping it would never end.

Kelly, meanwhile, was also going through multiple orgasms, only hers were not the weak dry shot like the fat-assed femboy getting ruined by her fat dick. She bared her teeth, grinning, as she finally got to enjoy the prey she chased for so long. Gone were his annoying muscles and powerful body; now he was like a male ought to be, a cute fat-ass with a far lower IQ than their weight.

"Guuuhhhhh... mmhhhhhfffffuuuuuuhhhh," Milty moaned.

"Good... boy!" Kelly moaned. Her hips slammed into the thick hipped femboy and held in place as she erupted with another load, her fifth or sixth already to flood the small male's belly. She watched as his whole body jerked and shook as he went through another couple of orgasms.

"Enjoy them while you can, slut, because that prostate's gonna be minced by morning," Kelly said, her voice sweet as honey and sharp as a stinger. "But you won't mind because you're not going to be able to get off unless it's from me fucking that hot ass of yours."

"Mmfffffhhhhyyyesssssss," he moaned, head flopping across the floor with each lunging thrust coming behind him.

Kelly's hands pushed Milty's legs further apart until he was nearly doing the splits. Her huge cock made a visible wave in his plump belly. His small balls and flaccid cock smacked up and down, flopping useless as her own powerful, thick, veiny meat slammed into his ass again and again. Her breasts dangled over his face, tantalizingly close. When his hands summoned the strength to lift themselves upwards for some worshipful rubbing and stroking, she let out an appreciative moan and flooded his guts again.

"Goooood boy," she gasped, squirming as her massive cannon blasted his insides. "Fuck, what a good boy..."

Kelly put all her weight on him. Her hips mashed down, grinding her thick cock as deep as she could into his formerly virgin ass. Her hard abs crushed his cock as he dry-fired again. Kelly groaned and smirked as she rolled her hips forward, grinding down into the hot, tight, clenching femboy butt. Her hand clenched around his wrists, pulling them over his head, as her huge chest smothered his face. She came again after a few more minutes of hard, rough humping, grinding out one more shuddering orgasm before she was satisfied with herself.

"Awww, fuuuuuuck, I needed that," she groaned. She pulled her knees up beneath her, then stood up. Her fat, still erect cock jerked free of Milty's ass with a wet pop and a slurry of jizz. "Mmmmhhhhh, fuck yeah."

Kelly wrapped a hand around her dick, then slid her long, slender fingers along the veiny length. She squeezed as she went, encouraging a few thick ropes of seed from her broad tip. She aimed them at Milty, and smirked even more as she watched the warm cum drizzle over his messy face and chest.

"You're gonna make a nice little fucktoy," she said, shaking her cock clean. Strands of seed splattered Milty and a broad area around him. "I'll see you at our next lesson, slut. I'm gonna enjoy filling that fat femboy ass again, too."

She didn't say anything else as she used his shirt to wipe herself down to dry some of the sweat on her muscular body. She grinned as she finished by swirling it around her still-dripping cock, then tossed it at Milty's dazed face. She got dressed, then left without a word.

Milty didn't move for a long time.

Yoga really was difficult compared to bodybuilding.

A few more months later...

"Oh, fuck, yes, choke on it, you little slut!"

Milty's throat bulged. His eyes peered upwards as his jaw distended around Kelly's erection. He gazed at her with pure adoration as she wrapped both hands around his head and furiously pounded his mouth with her oversized cock.

"Fuck, this throat is so good... I can't stop! Fuck!"

Milty's butt cheeks spread across his feet. His hips had grown and expanded thanks to his five-times-a-week lessons with Kelly over the past month. He was constantly on his stair machine to burn off all the calories she left in him. Not that he minded - the more she pounded him, the fatter his ass got, and then the more she wanted him. As far as Milty was concerned, it was a win-win situation.

Jizz sprayed from his nostrils. Her scent and taste overwhelmed his senses. His hands gripped her thighs, but it wasn't as though his toothpick arms could move Kelly's enormous, muscular thighs. Her fingers twined around his hair and jerked him forward as she came, mashing his nose into her loser belly as her entire erection disappeared between his plump, wet lips.

"Yeah... oh, fuck, yeah... such a good boy... don't spill too much now..."

Milty swallowed hard, again and again, trying to follow her order. His stomach, already plump from so many fillings, jiggled as his fingers dug into her muscles. She felt so good... so hard and powerful... he gave her massages at the end of every session now, so he really got a great opportunity to feel just how strong she was. He loves feeling her smooth skin and hard muscles slick with the warm oil as he rubbed and squeezed her, sometimes leaning on her to try to put more pressure on the knots in her muscles. He loved the feel of her squirming around as he even used his elbows to work out the kinks.

And then, of course, she would kink him right up. Hard, fast, and rough, just the way Milty liked it.

His mouth stayed open when she dragged him off her huge cock. He showed her the pool of jizz still in his mouth as he swallowed, making it disappear along with the next few blasts of cum, most of which splattered his forehead and eyes instead of his mouth.

"Mmmmmffffff, ffffffuuuuuuck!" Kelly groaned, clearly enjoying herself as she pumped another load across Milty's narrow, feminine features. "Goooood booooooy!"

Kelly panted, breathing hard as her jerking erection throbbed with energy, still fully aroused and dripping. Her hands grabbed at Milty, shoving him down onto his belly, turning him over so his plump, thick backside presented fully for her.

"I just can't get enough of this ass," she grunted. Her thick cock slapped down, wedging itself between his cheeks. "Yoga really did you good, Milty. I'm glad you gave up on those silly weight lifting dreams."

"Mmmhh... ohhhh, yesssss," Milty groaned.

"Heh... look at you... I knew the moment I saw you that you were meant for this," she grunted. The tip of her huge shaft pressed between his ass cheeks and teased against his hole. She smirked as he pushed back against her. "Such a natural femboy slut... perfect little cock sleeve... oooh, but you feel so good, baby..."

Kelly's wet, saliva- and cum-drenched dick ground into Milty's ass with surprising ease considering her size. Milty moaned and squirmed and wriggled, but with her weight lowering, her huge breasts settling across his shoulders and head, her hands grabbing his wrists and holding them out to his sides... there was nowhere to go, no chance of escape... nothing to do but wriggle and beg for more.

"Yeah, I know you love it, bitch... I know you can't get enough," Kelly grunted. Her hips pumped forward, over and over. The wet slaps echoed through Milty's living room. "Nnfff, you're such a fucking slut... I can't help but try to get you pregnant!"

Milty's cheeks bulged as he clamped his lips shut. He tried to keep her load inside, but she was just too much. Cum squirted from his nostrils and from between his lips and fingers as her hands smacked around his ass and clenched. She dragged him back onto her aching dick, making him take every inch, every throb, every spurt of her potent seed.

Her hips started thrusting again a few moments later. Her hard cock ground into the base each time before she dragged her entire length free, popping the tip out for a second or two before thrusting back in. Milty's squeals and inarticulate cries of pleasure made Kelly's eyes glint. Her hips pummeled down harder, faster, as she went for her third orgasm in a row.

"Fuck, you're turning out perfect," Kelly groaned. "I can't wait to see this ass after a few more years of training!"

A few more years of training later...

Kelly had one hand around Milty's throat, keeping the femboy pinned against the wall. His narrow, slender shoulders twitched and squirmed as he drooled and moaned, his eyes half-lidded and his whole body clenching as hard as he could around her massive arousal. She pumped forward, keeping her other hand on his fat, plump, chubby ass, which was more than twice the width of his shoulders. His equally thick thighs spread around Kelly's powerful, muscular belly as she leisurely thrust into his overstretched hole.

Milty giggled and moaned between gasps for air. He was a little disappointed that Kelly ripped off the pink lace bra and panties he was wearing earlier, though she left his high heels on, at least. Said high heels kicked uselessly to the sides of Kelly's hips as she ground inside, pulled out entirely, then spread him open again. His tight, narrow stomach bulged with the outline of her length as his mouth opened and his small dick throbbed. He was already dry-firing, and Kelly's pace increased as she felt her own orgasm approaching. How long had it been since she first blew her load into Milty's tight, sweet ass? She still couldn't get enough... her thighs tensed and her biceps bulged as her chest flopped around his face. Her hand tightened on his throat, clenching until he started really wriggling. Kelly's tongue hung out of her mouth as she leaned back and finally relaxed her grip. Milty's whole body seized up like a vice around Kelly's huge dick, and the yoga trainer's body flexed, muscles bulging, as a rapturous wave of pleasure cascaded up her spine.

"Fuuuuuuuuuuuuuuuuck!" she gasped at last. "Fuck!"

She kept pumping her hips. Her hard dick filled him again, then again and again, but eventually, even the most powerful reactors run out of fuel...

"I wanna fuck you forever, you tight little slut... fuck, you're my good boy, aren't you? My good little boy... mmmmffffff... such a good, tight ass... fuck..."

Milty reveled in the praise, but then let out a series of lustful gasps and surprised moans when she dragged him off her cock and tossed him aside.

"Time for you to get to work," she said, grinning. "You gotta pay the fees for my lessons after all."

Still twitching and in-between moans, on his back on the floor, Milty nodded his head. He quit his last job, and made lots more money as a waitress at a strip club downtown. He earned lots of tips showing off his thick backside, all of which he used to pay Kelly's lesson fees, and sometimes even Kelly herself showed up to the club for a dance in exchange for a discount on next week's lesson. With his extreme flexibility thanks to the constant yoga practice, he was quite the popular attraction both on and off the stage.

The end