David Winston was tall, well built and talked with a sense of authority, particularly in the presence of women, but those who knew him well, including his current assistant Anna, knew it was all a charade. When things got sticky, he would be the first to duck for cover.

David secretly lusted after Anna, but never had the courage to pursue her. Anna had occasionally been tempted by the larger than normal bulge in the front of his pants, but had little trouble resisting the urge when she considered the rest of the package.

The pair had been assigned to research plant and animal species in the Amazon rainforest which might contain useful drugs. During two previous field trips they had discovered a dozen species with potential for everything from sunscreen to anti-cancer drugs.

This field trip was designed to search for compounds that might provide a drug to compete with Viagra. Anna had found an old report that mentioned a tribe of natives who practiced fertility rituals involving all kinds of extracts from local plants and animals. The reports were pretty sketchy, but it sounded like a potential gold mine so she was keen to get started. David also made enthusiastic comments, but his lack of sincerity was pretty obvious. The reputation of Amazon women clearly worried him.

As they made their way up the final stretch of river to the reported location of the village, both David and Anna were feeling more than a little apprehensive.  The tribe had only been visited by a few intrepid anthropologists and several of them had not returned. To their surprise, they were greeted at the river bank by an enthusiastic welcoming party. The old reports had mentioned that the tribe had been rather hostile to previous female visitors, but apparently the fact that Anna came with a male companion was viewed favourably. The group were all females of classical Amazon physique which immediately heightened David's concern, although he had to struggle to stifle an erection growing in his shorts as he studied their nearly naked bodies.

A tall woman leading the Amazons introduced herself as Marni. To their surprise, she greeted them in broken English. Apparently she had learned the language from one of the previous visitors. As they trekked to the village, Anna learned that they had arrived at a very fortunate time. Marni explained that the annual wet season fertility rituals would be performed that night and the visitors would be invited. Anna was not quite sure whether the invitation was to watch or participate... David was distinctly uneasy about the prospect of "participation", but his cock had no such reservations. It was rapidly expanding down the leg of his trousers.

They reached the village just on dark and Marni led them to a large grass hut which was to be their accommodation. Anna began to unpack her equipment while David explained as best he could that they would like to collect some samples of the various extracts that were to be used in the ceremony. Marni was surprisingly forthcoming and, looking at David, she indicated the tribe would be happy to trade some specimens. David was not sure what they could offer in return for the trade. Cash would clearly be of little use to these people and they had brought little in the way of goods that might be considered valuable. Anna suggested they worry about that later. For now, she was focused on learning as much about the ceremony as possible and collecting anything that was involved.

Just as Anna finished preparing her collection equipment, a loud female whooping noise came from the clearing at the centre of the village. A group of women had formed a circle and were jumping and chanting in a trance like state. The women were surrounded by a large crowd of onlookers. As they moved outside to watch, Marni began to describe in hushed tones how the ceremony would unfold. There were to be two events that evening, a fertility rite and an initiation for young men of the tribe.

The fertility rite was to ensure that the young women who had come of age would be ripe to conceive the next generation of the tribe. Apparently the tribe believed that their women would only become fertile in an extreme state of sexual arousal. The purpose of the ceremony was to arouse the young women into a state of sexual frenzy. A few of the fittest and strongest young men would then be chosen to impregnate them. Only those men who had not yet been initiated would be chosen.

After the fertility rite, there would be an initiation ceremony to confer the status of "manhood" on a chosen male. The unfortunate participant would gain some respect for his contribution to the tribe, but would become ineligible to participate in any future fertility rites.

David was much more interested in the fertility rite. He secretly fantasized about participating in the event. After all, he had not yet been "initiated" and he certainly considered himself man enough for the task. The thought sent another surge of blood to his already straining cock. Anna was more curious as to why only the uninitiated men would be used. Surely in most cultures, the opposite would be true.

The women in the circle closed in to form a tight group around a huge stone slab at the centre of the ceremonial ground. The women were completely naked except for intricate patterns of body paint. Marni explained that the body paint was made from a mixture of leaves, roots and sap which passes through the skin and produces a kind of sexual intoxication which will not subside until the woman has been impregnated. This sounded like exactly the kind of thing Anna was looking for. She asked Marni to describe the plants in detail and scribbled feverishly to record the descriptions. Marni even offered some samples for Anna to keep. Anna began to wonder what Marni might want in return for her trade. Marni seemed unconcerned as though a fair exchange had already been negotiated.

The women's chanting slowed to a rhythmic humming and the circle parted to allow entry of an adolescent girl carrying a small wooden bowl filled with a thick amber liquid. The circle closed around the girl and she slowly dipped a finger into the bowl. Then she approached the nearest woman in the circle and slipped her glistening finger straight into the woman's vagina!

David was shocked at the blatant display of lesbian sexuality, but he now had a raging erection and had to shift his stance to try and hide it from Anna. Anna was immediately aware of David's discomfort. She was certain he was getting off on this display and he would be useless for any serious research work until his balls were emptied. Little did she know that Marni had already planned to solve that problem!

The girl began to massage the liquid into the woman's genitals, concentrating on her clitoris. In seconds, the woman was writhing in ecstasy and had to be restrained by members of the surrounding crowd. Anna could see that the liquid would be an absolute winner for the drug company and begged Marni for details of its ingredients. Marni explained that the liquid was produced from the venom of a rare species of snake and once applied to the sexual organs it produced an insatiable sexual frenzy. Anna asked Marni to describe the snake, but Marni said there was no need as one of the reptiles would be involved in the initiation ceremony later in the evening.

David and Anna watched in amazement as the process was repeated with each woman in the circle until they were all gyrating and thrusting hips in unison while being restrained by members of the crowd. Anna could not understand the babbling incantations of the women, but it was clear they were in desperate need of sexual release.

The men of the village began to filter back to their huts. Marni explained that the initiation ritual was about to commence and that only women were allowed to view the remainder of the ceremony. Anna would be allowed to watch, but David would have to stay in one of the huts.

When David and all the village men had gone, the women formed a tight circle including Anna. A young man was brought into the circle followed closely by a tall muscular woman. The young man's hands were bound behind his back and, despite his obvious fear, he was sporting a large erection. The reason for his erection soon became clear. The woman behind him had a firm grip on his balls and her fingers dripped with the amber liquid. Anna felt a twinge in her vagina and the slippery sensation of juice between her labia. The sight of a woman in total control of a sexually aroused man had awakened her sex.

The tall woman released the young man's testicles and melted back into the crowd. The young man looked around frantically, but the circle closed in, cutting off any means of escape. Suddenly one of the writhing women was released by the crowd and there was a great cheer as she tackled him to the ground and immediately impaled herself on his straining cock. Screaming wildly she rode the young man's body, thrusting twisting and driving her hips down onto him until he arched his back in an orgasmic spasm. At that moment, the woman riding him reached back and grabbed his balls. As the sperm erupted from his body, she pulled upwards on his testicles. The young man groaned in ecstasy and pain. Held securely by his tender reproductive organs, he was forced to deliver every drop of his seed deep into the woman above him. When the last of his spasms subsided, she released his balls and stood satisfied above him. Thick white streams of his semen rolled down her dark skinned thighs. She stepped back to rejoin the circle as the spent male was carried away by several women from the crowd.

Anna was spellbound. She had experienced a few female dominance fantasies in the past, but seeing a woman take a man by the balls and fuck him for his sperm set her pussy on fire!

The young man was soon replaced by another with an equally rigid cock and captive balls. Again he was pounced on by a depraved woman and ridden until the entire content of his balls was consumed by her hungry vagina. The process was repeated until each of the women in the circle had ridden a young tribesman for all he was worth. Anna watched each depraved coupling with increasing fascination. As each new cock was swallowed by an insatiable vagina, Anna's own pussy buzzed with anticipation. Musky pussy juice seeped into her panties as each frenzied fucking session began and Anna's vaginal muscles clenched tight as each woman gripped the young man's gonads and squeezed his nectar into their bodies.

As the ceremony progressed, David could hear the chanting and howling noises outside, but hadn't been too concerned about missing anything because two of the Amazon women were occupying his interest inside. As soon as he arrived, they prepared a bed for him. He was a little concerned when they began to remove his clothes, but their stunning bodies, barely hidden beneath ceremonial body paint, soon had him distracted.

After removing all of David's clothes, the women began to massage his body. For an hour or more, he laid back and enjoyed the show as dark hands worked over his soft white flesh. He was already erect when they removed his trousers, but when they applied the amber liquid, he knew the true meaning of "rock hard". His cock was soon throbbing almost painfully, spurred on by the erotic sounds coming from the ceremony outside and several more pairs of massaging female hands. He soon felt the desperate urge to fuck one of these women, but they seemed intent only on arousing him further. He tried to get up but the weight of hands holding him down was beyond his strength. He began to panic and opened his mouth to scream for help, but it was instantly filled with a gag of coarse fibrous cloth. He felt his legs being drawn apart and his eyes widened as a pair of hands wrapped around his testicles and began to massage the amber fluid into his scrotum. David's balls began to swell and ache for release. Clear prelum fluid began to flow in a steady stream from the tip of his cock. The women knew he was ready.

When the last of the ceremonial couplings was complete, a hush fell over the crowd. Marni explained that the initiation ceremony was about to begin and she described the purpose of the event.

"Venom come from special snake. Snake must eat man balls to make potent venom. We need venom to make girls fertile so we make offering of mans balls to snake."

Anna's jaw dropped. She couldn't imagine how a practice like this had evolved or indeed how it would be conducted. She imagined ritualistic castration scenes conducted by some Amazon priestess. Anna found the courage to ask how it was done.

Marni replied. "We prepare man and offer him to snake. Snakes follow scent of cock juice. They know that man with wet cock make easy meal." she said with a wry smile.

"When snake bite man, he get very hard and balls get big. When man's balls full with sperm, we feed them to snake."

It was suddenly obvious why the initiated men could no longer be used for the fertility ritual!

Anna's secret passion for male dominance was fired by the idea of a man being castrated by a snake. She felt her vagina twitching and a familiar slippery sensation developing between her vulva.

Anna watched as the group of women parted again and a more mature man was led into the circle. To Anna's astonishment, the man was David! For a moment, she thought about doing something desperate, but she was totally outnumbered and besides, the twitching in her vagina had returned with a vengeance.

The woman leading David was tall with a sleek, muscular frame. Her dark skin was a strong contrast to David's pale pink flesh and Anna could clearly see her long, powerful fingers clutched around his scrotum. She had him by the balls!

David was somewhat bigger than the native men and his aroused balls were quite a handful for the woman. The crowd clearly appreciated this unusual offering and Anna appreciated seeing him literally in the palm of a woman's hand!

"What are they doing to him?" asked Anna.

"They are preparing him for the snake." replied Marni. "He make plenty new venom for us!"

Suddenly Anna understood the nature of the trade she had entered into. In return for the samples, Marni wanted David's balls!

Again Anna considered doing something desperate but decided it would be pointless and would destroy any chance she had of returning with her precious samples of venom. Besides, the idea of seeing David lose his balls was beginning to grow on her. In fact her vagina was positively drooling at the idea!

David's female captor pulled down hard on his scrotum. He gasped aloud and sank to his knees in the centre of the large stone slab. She pushed him forward until he was on his hands and knees. When he was held firmly in position, Marni stepped forward and took control of his genitals. Then with her free hand, she drew a long ivory tusk from her belt. It had been carved into a unique shape with a rounded tip and an ornate handle. She dipped the tip in a bowl of venom and lifted it high above her head. The thick liquid rolled slowly down the shaft. When the tool was completely covered, She lowered it ceremoniously towards David's anus.

When Marni had the tapered tip aimed directly at David's anus, another woman stepped in, gripped his ass cheeks and spread them wide apart. Davit felt the tip of the tool touch his exposed anus.

"Nnnggggh!" he grunted as Marni tightened her grip on his balls and plunged the ivory into his exposed anus. The venom on the tool instantly began to take effect and David felt his cock surge to a painfully hard erection. His hips began to thrust involuntarily and his balls began to swell. Marni probed deep into David's rectum until she found his prostate. She pressed the curved tip of the tool against his gland and with practiced hands, began to work over it with rhythmic strokes. The sensation caught David by surprise. David felt an incredible urge to cum, but Marni held him back. It was like nothing he had ever experienced. His cock pulsed in a painfully hard erection, pointing straight down between his legs.

Each time the Marni probed into David's body, he grunted again and a small, glistening rivulet of precum was forced from the tip of his straining cock. Anna watched spellbound as Marni skilfully manipulated David's sex glands. She kept him on the edge of orgasm, extracting a continuous stream of sex juices from his body while denying him the release he so desperately needed. Soon he had produced a sizable pool of sticky secretions on the stone altar.

Suddenly, there was excitement in the crowd. A snake had been sighted! Two tall, powerful women stepped forward from the circle and grabbed David. At last his aching balls were released and the tool removed from his ass, but he was by no means free. The women flipped him onto his back and each hooked an arm under one of his legs. David's knees were brought up to his shoulders and wide appart. He was held down with his genitals plainly exposed for all to see. His rigid cock stood vertical and his aching balls dangled freely between his ass cheeks.

The surrounding women backed away from the slab and began a slow rhythmic chant. As the chant increased in volume, there was a rustling in the leaves and a snake appeared at the edge of the clearing. Anna watched as it slid slowly across the bare earth towards David. Its tongue flicked in and out relentlessly, sensing its favourite prey. David began to panic when he caught sight of the snake and struggled to get free, but the women were more than his equal.

The reptile's heat sensors quickly located David's throbbing erection. His eyes widened in terror as it reared slowly up between his legs, opened its gaping mouth and struck!

David screamed as the snake's jaws latched onto the glans of his penis. He struggled frantically, but the women held him down and let the snake do its work. As its fangs sank into his swollen cock tip, fresh venom flooded into his loins. It felt as though hot molten metal had been pumped into his veins. His cock pounded between his legs and his balls began to swell as the venom sent them into overdrive.

As David slipped into a frenzy of sexual frustration, the snake began to lift the rest of its body up between his thighs. Anna watched entranced as it slowly curled a loop of its body around David's scrotum. Its body tightened, forcing his balls down into his sack. Another coil tightened above the first. David was lost between the powerful sexual urges flooding through his cock and the increasing pressure on his balls.

The snake injected the last of it's venom into David's cock, then released his glans and lowered its mouth towards his captive balls.

"Nnn.... No! Please!" begged David.

Marni just ignored his plea and dipped her fingers in a bowl of venom. She gently clasped David's aching sex organ between her fingertips and drew upwards along his shaft. It felt as though she was milking his cock toward orgasm!

"Oh... oh GOD!" he gasped.

Her fingertips slid slowly down again working more venom into his pulsing veins.

"Nnnnngghh!" David grunted through clenched teeth. He flashed a desperate look at Anna, but she was standing in open mouthed lust with her eyes fixed on his captive genitals.

Marni brought her fingertips upward again until she had his deep purple glans between her thumb and forefinger. Her expert fingers began to manipulate the swollen tip in small circular movements. The motion was almost imperceptible to the surrounding onlookers, but David certainly felt it!

"You give balls now?!" queried Marni in a firm tone. She drew a short curved blade from her belt as she asked the question.

As she lowered the knife between David's legs, the snake sensed an approaching meal. It constricted its body tighter than ever, pushing David's balls far down into his sack and stretching his skin drum tight over the swollen orbs.

"Uhh... Ugh... Unnnh!" David gurgled as he struggled frantically on the verge of explosion.

The women holding David down were clearly getting excited by the events. They knew David was on the brink of initiation and the snake was about to feed! They tightened their grip on him in preparation for what was about to come.

As Marni worked the tip of his cock, David felt the building pressure of a powerful orgasm. He tried desperately to stop the avalanche of sensation.

"You give balls, I let you cum!" urged Marni, increasing the tempo of her fingers on his distended glans.

David's hips began to jerk.

"Ungh! Unnngh! OH GOD PLEEEEASE!!!" yelled David as an enormous jet of sperm shot from the tip of his cock.

As the first powerful spasm wracked David's body, the women holding him down lifted his head so he could watch his own castration. With a deft movement, Marni slit open the tight stretched skin covering his balls.

David's screams were a mixture of agony and ecstasy as he watched one of his testicles pop out of his scrotum and dangle by its cord.

The snake opened its mouth wide and engulfed the pink sperm filled orb. With jets of sperm still spurting from his cock, David watched in horror as the snake's powerful muscles forced the large lump down its throat.

"Unnngh!" he grimaced as Marni cut the sperm cord with her knife. He watched helpless as the lump in the snake's throat began to move down into its belly.

Anna watched in amazement as David's ball was devoured. She did not realise how turned on she was until she felt a hand slip into her shorts. It was the woman who had anointed the girls for the fertility rite! Before Anna could react, the woman found her clit. In seconds Anna was writhing in ecstasy as she watched David being emasculated.

David's cock was still pumping wildly in orgasm. Thick ropes of white sperm shot up into the air and landed on the women and the snake. The snake quickly constricted its body again and squeezed David's remaining testicle out of his scrotum. It was devoured like the first, but Marni allowed the snake's swallowing reflex to pull the cord tight. She left David dangling by his testicle until he was writhing in the final throes of orgasm. Then, with a flick of the wrist she set him free.