Leg Day

The gym was always quiet this early in the morning. The few patrons were there to get a session in before work and to avoid the obnoxious teenagers that took up the machines in the evening. Billy had only been working there as a P. T. for a week, but he'd gotten himself on first-name basis with several of them. There was Johnny, the accountant who was trying to get in shape so he'd stand out more for a promotion and for the new intern. Sally, a girl who had just moved to town for college and wanted the cheapest gym she could find. And Frank, the middle-aged man who wanted to get in shape after getting sick and was more than a little concerned about his wife talking about all the hot men in movies. It wasn't a particularly high end gym, some of the machines simply didn't work anymore, but everyone seemed to have decided that it just looked better having them. It was a starter gym by nature. One for kids to come by after school while their parents wait irritated in the car.

Today he was going to meet a new potential client, Claire, who had just moved back to town after leaving for college six years ago. The name set him on edge, though he would never admit it. Claire was the name of a girl who had bullied him relentlessly in high school for his obvious crush on her. She would make his life hell with words and the long line of men that wanted to fuck her would make his life hell with their fists and then go home empty-handed. But he reassured himself that there were dozens of women with that name and it wasn't as if he was living in some backwater nowhere town. Just in case, he told himself, he stood in the mirror of the changing rooms, straightening out every crease and adjusting his shorts to best show off the lean muscle of his legs. If it was Claire, he'd show her up... or maybe... no. He just wanted to see the shock on her face... nothing else.

He walked out to the front desk, taking in the sound of some other newbie bringing the machine down too hard, turning to see the dissatisfied look on John's face. Billy chuckled to himself and again meticulously pulled at the creased fabric of his polo shirt before sweeping his hand through his slicked hair. The double doors opened and his heart lurched in his chest as he immediately recognised her to be that very same Claire that had put him through hell every day and heaven every night in his dreams. The same soft blonde hair that fell in waves around her face. The bright green eyes that framed her heart-shaped face, above the plump swell of her lips that were painted in the same shade of cherry-red. The moderate curve of her breasts that sat neatly in her sports-bra that stopped halfway up her tight, toned stomach. And then the part that had always undone him, the enormous globes of her thick, meaty ass. The fabric of her spandex shorts strained futiley around them, fabric wedged deep into the crease between her full, heavy cheeks. The wedgie was so deep that it left an obvious cameltoe in the front of the shorts that she either didn't notice or didn't care about. The shorts barely covered up to her mid-thigh, a pair of legs that wobbled sultrily with each step she took into the building.

Claire stopped and looked her new P. T. up and down, at first very interested in his sculpted form before looking back at his face and going wide-eyed.

"Oh. My. God!" She blurted out.

He felt himself shrinking down, all his muscle and confidence fading as he found himself back in the body of the horny teenager that had lusted incessantly over this woman. She rushed over to him, the cheeks of her ass audibly slapping against each other in a sultry round of applause as she stopped just short of him and stared into his face.

"No way! Billy! From high school!? Holy shit!" She exclaimed with little care for the nearby patrons.

Uh... yeah... same Billy..."

She giggled and wrapped her arms around him, pulling him into a tight hug that crushed her breasts against him, undoing the last of his composure and reigniting the fierce crush that he had told himself he was over. He hugged her back awkwardly, half-open palms hovering just an inch away from her soft vanilla-scented skin. Her warm breath against his skin through the cotton of his polo sent tingles of sensation all through his chest and lower... and lower. Billy quickly pulled away from her before his cock could finish stiffening against her thick thighs.

"So you're back in town?" He asked to try and divert his blood back to his brain.

"Yep. Finished college and just wanted to settle down for a while, right?"

"Y-yeah. Good place for it. What did you study?"

She giggled and looked around the room sheepishly before leaning into his ear and whispering lowly.

"I did... sexology."

She pulled away, leaving the phantom of her breath tickling against his ear and looked up at him through her big blue eyes, teeth biting gently on her lower lip.

"S-sexology? Huh... I didn't... didn't know that was a thing." He said, his voice hoarse.

"Oh yeah it was awesome. We studied, like, seuxal behaviour and health and, you know, anatomy."

She giggled again and pressed her hand over her mouth as if she'd said something naughty.

"Uh... wow... I didn't know you were... into that stuff." He stammered.

"Duh! Look at me, Billy! I don't slave away building this ass so it doesn't get played with!" She said far too loud.

He nodded sharply and knew there was no way of stopping his erection from forming now as the fabric of his boxers began to tent. Her eyes flicked down for a moment but she didn't mention it, instead turning to the gym floor and surveying.

"So, my usual routine is squats, hamstring curls, hip thrusts and abductors. You have all that here?"

Billy stood dumbly for a few moments, staring at the crease of her ass where the fabric of her shorts remained wedged tight. Then the question made its way into his head and he remembered he was being paid to sell this gym to her.

"Y-yeah of course we do! We've got everything you need, Claire. Tons of girls here come and do that same routine."

"And do you eyefuck their asses too?" She laughed, not turning around but very aware of his gaze.

"I-I wasn't..." He began to blurt out.

"Relax! I'm just messing with you. I thought you'd know by now that's how I operate. Don't you remember how funny we were at school?"

He had not laughed at a single one of her 'jokes' that consisted of calling him a shrimp-dick, perv, virgin, loser or something to that effect. But now, with her fat ass right in front of him, he started to wonder if he got those memories wrong. Maybe he had just been too sensitive to see that his bully was actually just trying to joke with him.

"Y-yeah. You were super... funny. Been a while."

She smirked to herself and then straightened her face and asked him to take her to the abductors first for an easy start. He was torn between letting her lead to get a good view of her ass and himself taking the lead to hide his hard cock, and decided that the second was the better option. They arrived and she sank into the seat with a beautiful thud, the thick meat of her thighs jiggling against it as she collided. He was stood behind her, eyeing the overflowing flesh of her ass that the seat could not fully contain.

"Oh my god, Billy. You know what this reminds me of?" She asked cheekily.

"Wh-what?"

His nervousness was obvious.

"That time we had a math test and I was sat in front of you in my booty shorts remember?"

How could he forget? It was a pretty important paper and he had spent weeks revising for it, but all that had gone out of the window when she sat down in front of him in those tiny shorts. Like today, the fabric was mostly wedged between her cheeks, leaving the full and heavy shape of them on full display. He spent the first five minutes of the paper straight at her ass and had not answered a single question when she suddenly reached into the waistband and tugged the shorts up higher, exposing each round, pale cheek to his gaze. The flesh of her ass dimples and strained against the confines of her shorts that looked more like underwear now than anything else. She had shifted about in her seat needlessly and on more than one occasion had stood up to stretch and then dropped down with a thud, the way she had onto the abductors' seat, setting everything down there in motion. By the time the bell rang and the teacher called for their papers, his underwear was a mess of fabric damp with pre-cum and his test sheet was half-filled in with random guesses.

"Y-yeah. I remember. Totally failed that test."

"Oh god, yeah you did! Man, that was a fun prank right?"

"Uh... I mean... I had to retake that class in the summer... it kinda sucked..."

"But the view, Billy! You basically saw me in underwear! You know how many jocks begged for that and never got it!"

The memories had amplified his arousal and he went wide-eyed as the first glob of precum escaped into his underwear. He looked around in panic although no one could possibly tell and realised he had to act naturally.

"Yeah... yeah it was awesome actually..."

"What do you say to me? That you never said then?"

"Th-thank you." He choked out.

She grinned, face obscured to him standing behind, and began her set. She performed every rep with an exaggerated breathy grunt that would not be out of place in a porn parody and it was the most erotic sound he had ever heard.

"Its so hard!" She gasped breathlessly as she finished.

"N-no its... oh... yeah... the workout."

"Duh! What else would I be talking about?"

He lowered his water bottle down over his crotch.

"Nothing." He said sharply.

They moved onto the hip thrusts then, the heavy barbell resting across her hips and her thighs thick and straining with the effort. Her ass was clenched into a thick shelf of muscle that had caught the attention of all the other early birds in the gym. She scrunched her face up and then thrust up into the air, holding at the top and then coming down with a soft, breathy sound. Her ass bounced against the padding at the bottom and then she thrust up again with a louder grunt that caught the attention of several men.

"God this one's so embarrassing... its like they're watching me have sex with the wind..." She said lowly to Billy.

His cock throbbed hard against his underwear, the slick and sensitive tip rubbing against the soft fabric and releasing another glob. He stifled a grunt of pleasure and tried and failed to think of an appropriate response.

"Uh... no.. no one's looking."

"Well, you'd better be. What if I got injured and I lost my ass? God, I'd probably become depressed. I mean, its a great ass, right?"

He nodded dryly.

"You don't seem very enthusiastic, Billy. You couldn't stop staring at it in school. Do you not think I'm hot anymore?" She struggled to hide the lilt in her voice to match the deep pout thay was forming on her face.

He looked with guilt at her sad expression and then with even more guilt at her sweat-soaked breasts that heaved in her sports-bra.

"N-no... you're still... still really hot." He stumbled.

"Really? Am I the hottest girl here?"

He looked around for a way to answer no and found none.

"Y-yeah... probably..."

She racked the bell and sprung up, her cheeks clapping together audibly and again drawing the attention of the other men as they collided against one another under the strained fabric of her shorts and jiggled deliciously before settling. She threw her arms around his neck and planted a deep, wet kiss on his cheek that sent his cock jumping about in excitement in the confines of his boxers before she pulled off with a wet pop and a mwah.

"Awww! That's so sweet! You're still the same old, Billy! What was my nickname for you again?"

His face turned crimson.

"Sh-shrimpy Willy..."

She giggled and clamped her palms against her cheeks in fake shock.

"Oh my god, it was! Wow! That's so mean! I can't believe you let me get away with that! You must have really, really liked me, huh?"

"Let's... let's go do your squats." He mumbled with his face burning.

She smiled and skipped ahead of him, the meat of her ass rising and colliding with itself and then dropping and doing the same again, shifting tantalisingly under the spandex. She could have lured him anywhere with a display like that. Maybe she was.

Claire stopped in front of the squat rack and had Billy load all of the weights onto it while she posed sultrily and took photos of her ass.

"Gonna send these to Mark. You remember Mark?"

Mark had broken his nose in high school. He remembered Mark.

"Kinda. Bit of a jerk."

She gasped.

"He's lovely! He's a mechanic now! He fixes my car in exchange for... well... booty pics." She said quietly.

His cock pulsed again, balls tight and drawn up close to his body. His breathing had quickened without him noticing and he could feel how damp the pouch of his boxers had become.

"B-booty pics? That's... cheap..."

"It is not! Jerk! This is the best ass in town, Billy! The best ass that will ever be in this town! Besides, I'm sure you'd do more for a couple pictures, right?"

"I..."

"Go on Billy, tell me, what's the biggest thing you'd do for my booty pics?"

She was leaning in close now, hot breath coating his face, the cameltoe in the front of her shorts only a few inches from his straining cock. He started stammering and blushing and felt the hot wetness of tears prickling at his eyes. She pulled back and burst into laughter.

"God, I was kidding! You're still so sensitive, Shrimpy Willy! Now, let's squat! Stay really close behind me, okay? I'm trying to hit a new personal best!"

She stepped forward and turned around, cupping her palms around the barbell and bending her knees into position. His eyes raced down to where her ass was thrust out an inch from the tip of his cock, shorts riding up under the strain of the position to expose the underside of her pale cheeks the way they had back in the math test. It would be so easy to just thrust forward a little and rub against them, and he would be able to pass it off as an accident. But his cock was so hard and so sensitive that he did not want to risk making a mess of his shorts.

"Rack me off, Shrimpy!" She said.

He stepped forward to lift the barbell and she bent deeper, pushing her hips back and enveloping his bulge in the crease of her ass. Even through her shorts and her underwear, he could feel the immense heat from her skin and the built-up sweat trapped between her cheeks, suffocating his straining boner. Then she dropped down into the squat, dragging the full weight of her ass down along his shaft, pausing at the base and then thrusting back up explosively and sliding off of his tip. He moaned involuntarily right into her ear and she turned around and winked at him.

"I think I've got two more in me. Do you?" She said breathily.

He didn't. He knew he didn't. But he also knew that this was the hottest thing that had ever happened to him and all the blood that governed his rational thought was firmly in his cock, so he nodded and let out another moan as she dragged her ass back down the length of his cock and exploded up again.

His balls were clenched so hard and so swollen that they were practically inside of him and the tip was drooling steadily into his underwear and before he could compose himself she dropped down for the final time and sent him crashing over the edge. She racked the bar and clenched her ass hard, letting his weight fall into her and keeping his spasming cock trapped. He clamped his hands around her shoulders as his legs gave way and his cock pumped rope after rope into his underwear, each one forcing a moan and a burst of white hot pleasure as his orgasm detonated in his groin. She swayed her hips subtly, drawing out pulse after pulse as his balls emptied out into his boxers and leaked out into the fabric of his shorts to form a very obvious wet spot on the front. As soon as the last dribble of cum escaped his tip she stepped forward and his deflating cock fell sadly into the cum-filled pouch of his underwear.

"Oh. Guess you didn't have the stamina for squats huh?" She giggled.

Claire stared intensely at the enormous wet spot, eyes lighting up mischievously.

"So... Mr Personal Trainer... we got very personal, huh. Like I knew we would." She smiled at him evilly and took a step closer to lean into his ear.

"Now I'm sure you dont want to walk back to the changing rooms with all that cum on display, and I'm sure you don't want me calling your manager over and telling him that his new employee just thrust his cock against my ass until he came on me. Do you?"

"No!" He cried, far too loud.

"Shut up, Shrimpy. I'm gonna help you. I'm your friend, Claire, remember? So... I kinda knew you were my new P. T., and I kinda knew I could get you to pop off in your shorts. And I kinda know what I want in exchange. I'm going to train here three times a week with you, and you'll get to see my ass up close and personal... and in exchange for that and for my silence... you'll be the one paying my membership. I want the deluxe package."

"I-I can't do that!" He hissed.

"Can't you? Well, I'll tell you what I can do. I can scream and get you fired and probably arrested. So?"

He felt the cum rapidly begin to cool against his balls and against his thighs and glanced down to see the enormity of the mess in his shorts.

"O-okay! Just... fine... deal..." He whimpered.

"Good boy! There's a sweater in my bag, wrap it around your waist and then clean yourself up."

"O-okay..."

"What do you say?"

"Thank you."

"Good boy." She cooed and patted him mockingly on the head like a dog.

He took the sweater and wrapped it around himself and when he turned around she was already walking away, ass swaying under her shorts which were marked by small wet spots where his load had leaked out onto the fabric. He felt ashamed and cheated and pathetic and most of all, incredibly excited for her next session.