<p>"Five or six more sets," she gasped as she completed the last five crunches in the latest set.</p>
<p>"Are you sure?" Matt gasped. "We had quite the workout."</p>
<p>"Absolutely," Sara smirked as she collapsed to the mat to catch her breath. Are you too tired to keep going?"</p>
<p>Their workouts always ended with crunches. Sara loved pushing them to absolute exhaustion after their intense sessions. Their sit-ups with feet intertwined and facing each other would leave them gasping for breath and soaked in sweat. Sara insisted they complete the sets religiously, regardless of how long or hard they had worked out.</p>
<p>Matt looked forward to their workouts, which had evolved from trainer-athlete to partner training, which he designed to challenge them both. Sara was tiny, barely 5 feet tall, and under 100 pounds. She carried almost no body fat, rocking well-defined arms, legs, and belly, which she loved to show off. Sara was a flirt, constantly teasing him physically and verbally during their workouts. She always pushed him to work harder and taunted him mercilessly if he fell behind. She continually but consistently "accidentally" bumped into him and stole light touches as they moved around. She loved to dress to highlight her body, preferring the tight tops and skimpy bottoms favoured by female track athletes.</p>
<p>Sara had started scheduling her training sessions in the middle of the day when gym traffic was lightest, after a run-in with the gym manager regarding her workout attire. Matt liked this time of day as he could design their workouts to utilise all the gym equipment. At the same time, Sara could wear whatever she wanted without upsetting the gym manager. Today, Sara wore a white two-piece outfit that complimented her firm body.</p>
<p>After 90 minutes of vigorous training, they were exhausted and dripping with sweat. Sara's white outfit clung to her body. Her tiny nipples made a valiant attempt to push through the wet fabric. During the workout, her bikini bottoms had risen into her butt crack and lay wetly against her flat lower belly. Matt struggled to take his eyes off her firm ass as she worked her way through each exercise. Now that they were completing the partner sit-ups, his eyes strayed to her bikini bottoms as they rode up her firm legs and into her crotch.</p>
<p>"Let's go," she gasped as she prepared for the next set.</p>
<p>Together, they launched into the next set, elbows almost touching at the top before collapsing back on the mat. As Sara counted each repetition, Matt's eyes lingered over her firm sweaty body, imagining how she would look as she lowered herself onto his erection or sat her tight ass down onto his face. He found himself becoming increasingly distracted, unable to maintain the needed intensity.</p>
<p>"Twenty," she yelled out, falling back on the mat, knees falling apart, leaving Matt staring, once again, at her firm ass.</p>
<p>"I'm gassed; let me hold your feet for the last couple of sets," Matt panted.</p>
<p>"OK, fine, you wimp. Let's go, get ready, grab on," she laughed, wiggling her feet to let him know she was ready.</p>
<p>Matt jumped up quickly, kneeled before her, and grabbed her feet as she launched into her next set of crunches. Her face grimaced as she worked to complete all 20. With her eyes squeezed closed in concentration, Matt took the time to admire her body, which strained against gravity and exhaustion. Her stomach muscles rippled while sweat streamed down her flat belly to be absorbed in her bikini bottoms. Her nipples seemed to swell and harden with each sit-up, and her breath came in gasps.</p>
<p>"Twenty," she panted as Matt realised he had lost focus for the entire set.</p>
<p>"You..stopped..counting," she gasped.</p>
<p>"You need to focus on me," she whispered with a smile, "that is why I pay you."</p>
<p>"Yes, of course. I am sorry," Matt apologised again, "You are right, as always."</p>
<p>Matt did not want to admit why his thoughts had strayed, though he was sure she could sense his stares lingering on her body. Sara paused, allowing her knees to fall open as she strained to catch her breath. Her eyes remained closed as her wet chest rose and fell. Matt stole a glance between her legs, feeling himself harden further as he imagined her naked. Her wet bottoms clung to her skin and revealed subtle shadows of hidden treasures.</p>
<p>Matt looked up and was surprised to see Sara smiling at him. She stuck out her tongue and launched into her next set. Matt noticed her knees moving in and out with each crunch, and he swore her nipples hardened further. With the next set complete, she collapsed again. Matt noticed, between her spread knees, that a second wetter spot was starting in her bikini bottoms.</p>
<p>"Can I ask you a question?" Sara gasped, attempting to catch her breath.</p>
<p>"Of course, shoot," Matt replied.</p>
<p>"Have you ever heard of a woman having an orgasm from doing sit-ups?"</p>
<p>"Umm, sure, I guess, I have read about it. I always figured it was an urban legend. Still, I guess it is possible," Matt replied, "all that motion in your pelvic area, clenching and releasing of the core muscles, material rubbing on various sensitive areas."</p>
<p>"Well, I am not positive, but I think a few more sets of these crunches might put me over the top," Sara laughed.</p>
<p>Matt returned the laugh, wondering if she was teasing him or if she felt she might genuinely be approaching an orgasm. He glanced at her swollen nipples and the sizeable wet spot in her bikini bottoms and decided she might be telling the truth. He wondered if this explained her desire to push herself at the end of each workout and whether she had been silently orgasming each time.</p>
<p>Before he could reply further, she launched into another set. Her leg motion was more pronounced this time, her knees swaying in and out in time with her crunches. She met his eyes each time she rose from the floor. Matt sensed her gasping breaths becoming more ragged and her counting grunts more guttural. He lost count himself as he watched this incredibly sexy woman attempting to bring herself to orgasm as he held her feet to the ground. He had a front-row seat each time she spread her legs, watching with widening eyes as the wet spot in her bikini rapidly increased in size.</p>
<p>"Hmmmm, yes, that is good, fuck, I can feel it getting close," she whispered.</p>
<p>Sara did not stop at twenty this time but continued to curl herself up, her eyes locked on his. Her knees opened on the way down, daring him to look at her soaked bottoms. Her knees came together on the way up, her thighs grinding together. Matt watched her slide her nipples roughly across her legs at the top of each crunch.</p>
<p>"Mmmm, yes," she repeated.</p>
<p>"Mmmmm, oh, hmmm, yes," she moaned.</p>
<p>"Holy fuck, there it is, fuck, fuck, I am going to come," she moaned.</p>
<p>"Yes, oh my god, yes, fuck, I am coming," she squealed.</p>
<p>Her stomach, already abused by the crunches, started contracting again as her orgasm pulsed through her core. Her face and chest flushed red; her breath continued to come in gasps. With her knees pressed wide, Matt could see the wetness in her tight bikini bottoms increasing. He could even see the slight pulsing of her pussy as her orgasm surged through her tiny frame.&nbsp;</p>
<p>"Hmmm, mmmm, yes, fuck, oh, mmm," she moaned, her fingers never leaving her nipples, pinching and twisting.</p>
<p>Her hands stayed at her nipples; her eyes remained closed, and her knees rested wide open. Matt could see her little pussy spasming lightly under the wet material. He slowly ran his hands up her legs from her feet. Massaging her calves lightly, stroking her inner thighs as she calmed down from the heights of her arousal. His hands glided effortlessly down her sweat-soaked inner thighs, feeling the heat from her orgasm as his hands neared her groin.</p>
<p>"Mmmmm, I love the way you touch me, so soft, so gentle, yet I can feel the strength in your hands," she murmured, her hands never leaving her nipples.</p>
<p>"You like what you see?" she whispered.</p>
<p>"You are a very sexy woman," Matt replied.</p>
<p>"You want to see more?" she asked shyly.</p>
<p>"Whatever you want to show me," he replied with a grin.</p>
<p>With that, Sara reached down and pulled the wet fabric of her bikini bottom to the side, revealing her swollen pink pussy. The entire area was damp and red from her recent orgasm. Her inner lips were spread with her little clit poking up bright red at the top. Her orgasm leaked down across her tight puckering ass onto the mat below.</p>
<p>With one hand remaining at her chest to pinch her nipples, she reached the other down to spread herself wider for him, gasping as her finger grazed her swollen clit. Her pussy gaped wide, her clit swollen and red, peeking from the top of her wet crease. She slid two fingers inside herself, pulling them out slowly to slide them up on either side of her clit before bringing them to her mouth. Her moans got louder as her excitement started to mount. She sucked her fingers into her mouth, her tongue swirling around, her eyes half closed.</p>
<p>Her fingers returned again and again to her leaking pussy, delving deeper inside. She returned her fingers to her mouth each time, licking her fingers with growing enthusiasm. She would occasionally switch hands and use her wet fingers to lubricate her nipples. Her moans deepened as her hips began rocking to give herself better access to her hot depths.</p>
<p>"Want me to come again for you?" she moaned, her eyes half closed in pleasure.</p>
<p>"Yes, you are so sexy, so beautiful, so fit; come for me, baby; let me watch you come," Matt replied.</p>
<p>"Oh my god, Matt , it is so tight; it is gripping my finger," she moaned.</p>
<p>Her hips rocked as she pushed herself down on her finger, fucking herself more deeply with each thrust. Her pussy gaped open, her excitement soaking her fingers, thick and sticky. Matt could see her tight ass hole pulsing around her finger, gripping it on the way out, stretching to accommodate it on the way in.</p>
<p>"Fuck yes, look at my pussy, look how wet I am. Can you see me fucking my ass?" she moaned.</p>
<p>Matt continued to stroke her thighs, holding her knees apart to maximise the opening of her pussy. As he watched, she slowly slid a second finger into her ass, and her moaning increased again.</p>
<p>"Fuck yes, so good, so full, I can feel it stretching my ass," she moaned.</p>
<p>Her hips rocked up and down, impaling her ass on her fingers on the way down, sliding two fingers into her pussy as her ass rose off the mat.</p>
<p>"Let me see your cock, Matt ," she pleaded.</p>
<p>Matt looked around quickly, knowing the gym was empty but checking out of habit. He quickly removed his shorts and resumed his position between her legs.</p>
<p>"Stroke it, baby," Sara whispered.</p>
<p>"Yes, fuck, there it is; I am going to come; watch me come," she moaned loudly.</p>
<p>As she came, Matt could see her pussy contracting, her stomach following suit, spasm after spasm as her orgasm shook her. Thick wet fluid leaked from her pussy. Her gasps continued as she fucked her ass and rubbed her clit. Her orgasm lasted almost a minute before she finally collapsed back on the mat, totally exhausted.</p>
<p>She looked up at him, panting, eyes partially closed in arousal.</p>
<p>"I want you in my ass, Matt ," Sara moaned, "lie back."</p>
<p>As he lay back, Sara bounced to her knees. She swung her leg over his legs, bending over to take his firm length in her mouth. Her head bobbed up and down, spit dripping obscenely down his stiff shaft. Her hands reached up to play with his stomach and chest; her tongue swirled around the swollen tip each time her head rose. After a few minutes, she scrawled up his chest; her mouth found him; her tongue swirled around his mouth. He reached down to run his hard length up her wet slit to her clit, causing a gasp. Up and down her slit, over her clit and back down to her ass, getting the entire length well lubricated.</p>
<p>"Put it in, Matt ," she moaned, "I want to come with your cock in my ass."</p>
<p>Needing no further encouragement, Matt moved the head of his swollen cock to her wet ass. He raised his hips carefully. Her ass was tight but warmed up and well lubricated. He pushed gently against the tight entrance, slowly expanding the opening. Looking into his eyes, Sara shifted her weight back, engulfing his entire length in one slow stroke. She rose off his chest and leaned back. Sara's fingers moved back to her pussy, spreading it while she rubbed her clit frantically. She was sitting on his hips, his cock buried to the hilt inside her.</p>
<p>"Fuck me, Matt , hard," she yelled.</p>
<p>Matt grabbed her hips and lifted her off his belly. Pulling out slowly, he left just the tip in before she slammed herself back down. Her fingers worked in rhythm with his strokes. Matt's hands went to her butt, spreading her cheeks. He could feel his hard length sliding in and out of her ass. Over and over, she rose off his legs, to then slam herself back down.</p>
<p>Her moans got louder and louder, "Fuck Matt , yes, fuck my ass, fuck it deep."</p>
<p>"I'm going to come," she moaned, her bouncing increasing in frequency.</p>
<p>Matt could feel her ass contract around his cock, triggering his own orgasm.</p>
<p>"Fuck yes, coming, fuck your ass is tight," Matt moaned.</p>
<p>"Mmmm, yes, fuck yes," she screamed, "I can feel you spraying in my ass."</p>
<p>Sara bounced up and down her fingers, pinching her nipples, before finally collapsing on his chest. He could feel her heart beating rapidly. After another minute, when Matt thought she might have fallen asleep, she opened her eyes and sat up.</p>
<p>"Amazing workout, Matt , as always; see you Thursday," she said as she stood up, his cock slipping from her ass.</p>
<p>As she bent over to pick up her bikini bottom, Matt could see come running down her leg. She threw on a pair of shorts and a sweat top over her wet body, her sweaty bikini tucked into her bag. She quickly kissed Matt on the cheek and headed for the door. She let out a little laugh and was gone.</p>