The Parasite

Doug looked away for a moment, then nodded. "So, is that what your experiment is about? Do you think this was because of the..." He let the sentence hang.

"Nothin' gets by you." Marcus smirked.

"I told you not to do it, remember." He shook his head.

The two worked in silence afterward until the calendar alarm chimed on Marcus' computer. He fixed his pants and stood up. "Time to test some theories." Marcus announced and strode off to the lab.

Marcus arrived unabashedly with a urine sample. He had separated some out for various tests and was inspecting some of the samples under the microscope while Jennifer ran the other tests. There wasn't much in a visual inspection, so he decided to check on her progress.

He appeared over her shoulder, causing her to jump somewhat. Her heart maintained its quickened pace in his presence. Something about him excited her and she shifted uncomfortably, not fully understanding it. She caught his scent while she was explaining the tests she'd arranged and momentarily forgot what she was saying. Normally one would joke that Marcus' body odor could cause memory loss, but this was different. It was a visceral, animal scent of raw sexuality. She felt drawn to him and caught herself visualizing sucking his cock.

Jennifer shook her head clear and finished describing the tests she'd arranged. Marcus nodded in approval all the while noticing his cock slowly swelling, seeming to have a mind of its own. Doug arrived just as he was looking for some excuse to touch her - a pat on the back or something. She excused herself and went to the other end of the lab.

Marcus turned to face Doug, whose eyebrows raised up. "You need to keep a leash on that thing." He muttered, nodding toward Marcus' tented pants.

"If only." Marcus sighed and adjusted his pants. "It's like I'm a teenager again. Thing just does what it wants when it wants. I haven't had this many spontaneous boners since high school!" Doug seriously hoped Jennifer hadn't overheard. Marcus was well known for his lack of tact, so Doug was relieved that he had (mostly) whispered. He decided to let it go and try to be helpful instead.

"So what have you tested so far?" He nodded as Marcus listed the tests. "No semen samples?" Marcus quickly shook his head, seeming embarrassed. "Don't tell me you're shy! Not after what you did in the forest. Come on, it could be important!"

"Something else I can help with?" Jennifer appeared beside Marcus with a clipboard hugged to her chest, surprising both of the men.

Marcus opened his mouth but nothing came out. Multiple fantasy scenarios ran through his mind, clouding his thoughts.

"Marcus needs to make an, um, donation, and he's having a little difficulty." Marcus shot Doug a withering glare. He may be crude and lacking decorum, but he didn't want to get fired for harassment, and knew how to walk the line. Doug's only reply was a shit-eating grin that would have otherwise gotten him punched.

"Oh, well, if it's that hard," The attractive young chemist flicked her eyes to his pants and back with a hint of a smile all while standing closer than she probably ought to, "I'd be happy to help." Her full lips parted slightly and her chest heaved as she took deeper, more excited breaths.

"Just grab me a specimen jar, would you?" Marcus waved a hand, flustered. Doug shook his head, slapped the big man on the shoulder and left to return to his work. Marcus then scurried off to the single-stall restroom where he'd be able to lock the door and have some privacy. At least he knew what he'd use as his fantasy, feeling his cock continuing to swell in anticipation.

He found Jennifer waiting for him with the specimen jar in-hand. She smiled devilishly, any air of innocence she may have had evaporating in an instant. Without a word she pushed the door open and stood inside, waiting.

"You coming?" She asked pointedly.

_Not yet._ Marcus thought, feeling his own pulse quickening. As he stepped through the doors he felt reality melt away. He was no longer at the office, but the set of his own porno. It was like an out-of-body experience where he felt as if he were watching himself - or in this case, someone else playing him - in a scene.

Wasting no time, Jennifer shed her lab coat and hung it on the back of the door. Her back to him, she expertly pulled off her top and, with an arousing wiggle, slid out of her jeans. She wore a matching white lace bra and panties. Reaching back, she unsnapped the bra clasp and sent it gently clattering to the floor. She was slim and the curve of her bare back and hips got Marcus' blood pumping.

She turned her head to speak quietly over her shoulder, crossing her arms across her chest in a show of false modesty. "I figured we probably didn't have any magazines, and you really looked like you could use a hand." Her fingers played up and down her sides, the curve of her breasts just visible.

Still dumbfounded, Marcus stood unmoving. The pain in his crotch flared as his cock became engorged. It pressed conspicuously against his pants. Jennifer noticed this and turned to face him.

"Looks like you're going to need more help than I thought." She sighed theatrically, hesitantly uncovering her firm little tits to reach for his belt. Marcus was too shocked to protest, and stared at her as she removed his tented boxers to expose the biggest cock she'd ever seen. Even Marcus was impressed as his growth had continued to move him toward mythic proportions. She gently cupped his balls and stroked him with an inverted fist from base to tip, releasing and taking a step back.

"Are you really going to make me do all the work?" She tilted her head, examining him as she played with her small, but very erect, nipples.

Still flabbergasted, Marcus began absently stroking his cock. She rewarded him with a gasp and a hand down her panties, which she withdrew and sucked seductively. He knew with a show like this, he'd fill that cup to overflowing before too long. After a few seconds of increasingly vigorous stroking, however, she dropped to her knees in front of him.

"Need to get a closer look." She explained.

"I'm married you know." Marcus voiced his most pressing concern, trying not to think about the consequences.

"Ooh. Foreplay." She grinned wickedly. He could feel her breath on his manhood, which throbbed in response. Without another word, she lunged forward and took him into her mouth. He instantly felt her heat and groaned as she lubricated his shaft, pausing to flutter her tongue against his swollen tip, glistening with precum. After a few passes where he almost fell backward she grabbed his hips and pushed him as far as she could into her throat. If he'd had a clearer head he may have wondered how she did it without gagging, but as it was, the rhythmic pulsing of her tongue and throat around his cock threatened to drain him right then and there.

"Holy fuck!" He whispered hoarsely, grabbing the sink for support with one hand as his knees buckled. She'd've grinned if she could, but instead she began to bob up and down in long, purposeful strokes. She cupped his balls and pressed a finger firmly on his taint, massaging each in turn.

He came suddenly and forcefully, triggering the gag he had expected earlier. But she didn't release him. She continued to suck, draining him completely. She groped blindly for the specimen jar then spit an entire mouthful of thick cum into the frosted plastic cup.

"Well, that might be a tad contaminated, but I think we can compensate for that, seeing as how the contaminant is known." For a moment, Marcus thought that if he'd opened his eyes he'd see her standing in front of him, clipboard in hand, having just daydreamed the whole thing. But he didn't. He opened his eyes to see her wiping her mouth. She wore the same animalistic expression he'd seen on his wife and wondered if there was a connection with his condition and femenine desire beyond just physical dimensions.

The reality of what had just transpired washed over him as he buckled his pants back on. Jennifer seemed completely unaffected by the encounter and was checking her makeup in the mirror while she adjusted her clothes. He had no idea what to say or what to do next. Luckily, Jennifer seemed to have everything in hand. She peeked out the door before opening it and stepping out swiftly.

When Marcus had finally worked up the courage (and strength) to exit the bathroom, he found an empty hallway. Jennifer was back at the lab, where he met up with her.

"Did you get that sample?" She asked professionally.

He nodded and handed her the jar, unable to make eye contact.

"Great, I'll get started right away!" She chanced a quick, secretive wink to which he flashed a weak smile.

* * * * *

Sherry, their boss and Doug's wife stood in the center of the lab with Doug and Marcus. Her blood red stilettos and matching lipstick stood in stark contrast to her plain white lab coat. The coat concealed a sleeveless white button-down blouse and form-fitting black pencil skirt. The shirt was thin enough that the outline of her bra showed through enough to be noticed, but no one would ever comment on it. She took pleasure in knowing it was visible. She liked making men uneasy and often combined her sexuality and intellect to do it. No only did she enjoy it, but she found it gave her an advantage in most discussions and negotiations.

"So you're telling me that Marcus has a parasite in his penis that he picked up from Africa?" The men nodded. Her eyes subconsciously flicked quickly to Marcus' pants and back. "And that this parasite has both increased his size and made him infertile?" They nodded again. "Sounds like we should be working on a patent."

She smiled wryly and the men chuckled uneasily. "It's kind of like a tapeworm, growing as it feeds on nutrients filtered from the semen and urine as they pass through the urethra. It secretes hormones that trigger the increased growth, as well as arousal. Semen being its preferred 'meal,' it directly benefits from an increase in ejaculations" Marcus blushed as Doug ran down the clinical description. The list of symptoms read more like a description of some kind of after-dark superhero and made him feel exposed and embarrassed.

His beautiful boss glanced purposefully at his pants this time before addressing him. Her hair was pulled back tightly, not a strand out of place. She was the picture of composure as she spoke. "That much growth in that little time... must've hurt." Marcus nodded. "Probably felt like you were going to just... explode." She leaned slightly toward him as she spoke, her tone becoming less business and more seductive. Marcus nodded again and made a barely-comprehensible verbal confirmation that had probably begun as a word, but did not end as one.

There was a long pause - an awkward silence broken by Sherry slapping a palm on the table.

"All right, then." She waved a hand. "Let's see it."

Doug turned to one of the microscopes. "Well, we don't have a full specimen - only parts that have broken off and floated away. Marcus didn't want us to-"

"Not the parasite, numbnuts." Doug almost choked on his words as his wife cut him off. She looked straight into Marcus' eyes. "His dick."

There was a stunned moment of silence in which two very different thoughts were occurring in parallel. Marcus maintained eye contact while Doug looked back and forth between them. Sherry's gaze was so intense that Marcus could all but feel her caressing his swelling cock. Doug broke the silence with an uncomfortable laugh. "He probably would, too. Did I tell you about our last day in The Congo?" But nobody was listening.

Without breaking his stare, Marcus unbuckled his belt, unzipped his fly, and dropped his pants. His semi-hard cock peeked out from the leg of his boxer shorts, lifting them awkwardly. Sherry arched a manicured eyebrow while her husband threw up his hands and looked away. "Jesus, Marcus! Seriously?"

"Oh can it, jockstrap." She scolded him. "I want to see how big it gets. Hold this." She handed her lab coat to her protesting husband as Marcus stepped out of his shorts, his half-staff already swinging somewhere around eight inches in front of him. "Seems we need to introduce some more... stimulation."

Marcus was about to say something when his boss began unbuttoning her blouse. His words evaporated. He licked his lips in subconscious anticipation. She noticed and smirked.

"Big day for you." She said as she haphazardly tossed the delicate fabric over her shoulder, sending Doug scrambling to grab it. "You get to whip out your johnson in front of the boss, and see her tits." As she was speaking she caught the scent of his musk which, combined with the scene playing out, triggered an instant tingle between her legs.

Though she didn't show it, her heart rate was increasing. She got off on toying with men, but this one also promised a great return on investment. She stared at his expanding cock and felt her nipples harden. This one was going to get more than a simple show... Not one to break promises, she turned her back to her husband and snapped her fingers. "Unsnap me." She ordered.

Doug tried to protest, but she snapped again. Annoyed, but somewhat turned on, he fumbled with the clasp. So Marcus would see his wife's tits - big deal. He was sure others had in some way or another, she wasn't shy and always flaunted her body. He also knew she was an expert tease, and was confident that she would only take it so far.

The black bra slid forward off her arms to reveal a full pair of breasts that lived up to every fantasy Marcus had ever had of them, curving elegantly from her toned, slender body. He stared and felt her stare, but remained only partially erect.

"Oh dear." Sherry said flatly. "Looks like you're going to need more help." She bent forward towards him and reached up under her skirt. From his angle, Marcus couldn't see what she was doing, but it was arousing his interest and his manhood. With a seductive wiggle she pulled down a pair of matching black panties and kicked them aside, ignoring her husband's disapproving groans.

She lifted one foot to the crossbar beneath the stool Doug was sitting on. Her skirt rode up dangerously, exposing the tops of her thigh-highs. She traced a line from her knee to the hem of her skirt, then adjusted the stocking. Her fingers of one hand lingered on her upper thigh while the other rose from her waist to encircle one plump, firm breast.

"You want to touch them." Marcus couldn't tell if it was an invitation, a question, or a command, but he didn't care either. He stepped forward and, after the briefest hesitation, reached up and began caressing her breasts. He took his time with it, tracing and teasing her nipples. He felt the weight and softness of her tits, but more than that, he felt the eyes of her husband watching him, and that excited him at least as much as having his hands on such a beautiful, off-limits woman.

She felt it too and let out a gasp of pleasure. "Ah, now that's better." Marcus' cock had grown and was pulsing, pointing straight up her skirt. A wry smile played across her painted lips. She felt herself being pulled into her excitement and without fully realizing, wrapped her slender fingers around his girth. "Oh very nice."

Marcus took a shuddering breath when she touched him. Touching her was surreal, but her touching him was a whole other level. He fought to control his animal instinct which wanted to grab her and bend her over the desk. Satisfying as that would be, it might cross a line and would definitely end things too quickly. He reined in urges and waited to see how things would play out.

Sherry's fingers explored his full length. As she felt his excitement grow, so did hers. Her breathing was coming more quickly and her heart pounded so hard behind her breasts that she was certain the shockwave would be visible. Taken in by the moment and feeling vivacious and extremely horny, she cocked her head to the side. "Oh Marcus." She shook her head. "I think you can do better." And without waiting or explanation she lowered herself to her knees and began teasing her tongue around his tip. He moaned and grinned, enjoying the shocked look on Doug's face as much as the soft, wet warmth of the mouth of another man's wife on his massive cock.

She only teased briefly before bobbing up and down, sucking loudly and sloppily. She paused long enough to say, "I bet you cum like a cannon" before continuing to blow him. At this point he lost control of his urges and grabbed her hair, knocking some of it loose from it's tight formation but holding her head steady as he began pumping in and out of her mouth. Slowly at first, then more rapidly. He increased his intensity until she needed to hang on for balance, but did not try to pull away from him. He could feel his whole body starting to tingle. All he could hear was his heart pounding. Every muscle in his body had taken over on instinct and was working towards the same goal. With a supreme force of will, his conscious mind took control.

"Hey, Doug." Marcus gave his coworker a wicked grin. "I'm going to fuck your wife."

The flabbergasted cuckold sat immobilized by his confusion and embarrassment, wrestling with his own arousal as his sweat soaked, less-attractive coworker rammed his massive cock into his wife's mouth. Marcus then withdrew, a slender strand of saliva still connecting them. Sherry was panting and dizzy as he pulled her up by the hair. He backed her up to the lab table and lifted her up onto it by the hips. She fell back, catching herself on her elbows and unconsciously spreading her legs to try and balance.

Marcus wasted no time, grabbing her thighs and continuing their outward motion. One of her feet, still clad in her high heels, rested dangerously between her husband's legs. He took a moment to admire the glistening, smooth pussy before him. He stepped up and began rubbing his nob up and down her slit. She shivered and let out a satisfied moan. He started to press into her, watching her stretch around him, but then stopped and withdrew, continuing to slide up and down her. She squirmed beneath him, trying to press herself around him, but he wouldn't allow more than the very tip to penetrate.

"Please." She breathed.

"Please what?" He led her.

"Please fuck me." She moaned. Getting what he was looking for, Marcus grinned evilly and shoved himself into her. She was extremely wet and accepted him readily, but his girth was more than she had ever experienced and it was still a tight fit and took several attempts before he was able to insert himself fully. The feeling of him stretching her out made her already trembling body begin to shake noticeably.

Marcus thrusted rapidly and powerfully. He gripped her under her thighs and lifted her from the table. Her back arched as he pounded away. The sound of his sack slapping against her ass reverberated throughout the office, punctuated by his grunting and her increasingly intense moans. He felt himself on the edge but summoned every ounce of self-control he had left to resist until she squealed and gripped him tightly. At that moment he released and felt gob after gob of thick cum pump into her. He grunted loudly, tensing his muscles to pull her toward him as he buried himself in her until he had emptied his balls.

With a sigh he withdrew. His cock hung, limp but still swollen, glistening against his leg. Thick drops of cum oozed from her pink pussy onto the floor.

"Well." Marcus proclaimed as he cleaned himself with some paper towels and pulled on his pants. "I'm beat, so I think I'm gonna head home early. Doug, you're good to clean up?" Doug stared blankly, clearly still processing everything that had just happened. "Sherry, good to see you as always. We'll get you the full report soon. See you then." He winked and scampered out, leaving his boss still panting and spread across the lab table. He and Helen were going to have a hell of a night, and work was going to be a whole lot interesting from here on.