The two sons of Chief Okoro, leader of a tribe of Machoke, stood across from one another inside the privacy of a dimly lit straw hut. On one side was the younger brother Ikenna, who was the splitting image of his father; a tall, proud Machoke with an impressive musculature, including abs that were somewhat obscured by the fat of his well fed belly. Under Ikenna’s muscle gut stood a thick seven inch mushroom headed cock, and under that hung a heavy ball sac that measured nearly three inches wide, brimming with the seed that was to sire all future tribe members. On the other side was the older brother Thulani, who had the misfortune of being born a runt; shorter than most Machoke in the tribe and unable to build much muscle mass, causing his abs to be completely hidden underneath the fat of his gut. Underneath his belly stood a six inch mushroom headed shaft, one noticeably shorter and thinner than Ikenna’s, while underneath it hung a pair of orbs that barely reached two inches across by comparison.

Both Machoke wore bracelets on their lower left arms, Ikenna’s bearing the symbol of a phallus, while Thulani’s bore the symbol a micropenis. Ikenna stepped forward, grinning down at his brother as he reached out to grasp his wrists. “Father has chosen me to sire our tribesmen, and so I’ll be claiming what manhood you have as my own, as is our father’s will. If you have no objections, shall we begin?” Thulani sighed deeply, looking down as Ikenna bent his knees slightly, lining up the bases of their erections and pressing them up against one another. While Thulani’s shaft curved naturally upward, Ikenna’s cock curved downward, and so even though there was only one inch of difference between them, Ikenna’s penis leaned over Thulani’s. Feeling the combined weight of Ikenna’s larger shaft and balls against his own, Thulani nodded reluctantly. “I’m as ready as I’ll ever be, brother. Let’s begin.”

Ikenna’s grin grew wider as he recited an ancient phrase, the words of which were indecipherable, causing the bracelets on their arms to glow with a dark aura of power. Once the words were spoken, both brothers were struck by a wave of pleasure, caused by two distinctly different yet decidedly sexually pleasing sensations. Ikenna groaned as his shaft pulsed with warmth, growing less hard yet not losing any length or thickness, as the bracelets power gradually began increasing the capacity of his penis. Thulani moaned in return while his cock felt cool and harder than ever before, the skin of his shaft growing tighter and tighter as the bracelets power slowly began decreasing the maximum size of his erection. These same feelings coursed their way through the brother’s ball sacs, with Ikenna’s stretching out and Thulani’s growing tighter around his orbs.

The pleasure was so much that it caused Ikenna to cum right then and there, releasing five spurts of seed so thick that rather then making their way onto Thulani’s belly, they instead oozed down onto the bulbous head of Thulani’s penis, covering its slit and much of the glans. The feeling of his brother’s cum upon his erection sent Thulani over the edge, causing him to cum as well, releasing three spurts of seed, the first of which managed to break through the layer of Ikenna’s cum covering his slit. As the brother’s cum mixed together upon Thulani’s head, Ikenna could feel his cock lurch upward, making him look down as his shaft visibly grew longer and thicker. Underneath his penis, Ikenna’s balls spread slowly outward, as his entire package further outsized that of his brother, who was also noticing a change. Thulani cringed as he looked down to watch his shaft begin to diminish in both length and thickness, retreating further under his brother’s erection that had grown in return.

Like his cock, Thulani’s balls began to shrink, becoming more obscured by the larger orbs of his brother, that had only gotten bigger. Once the first transfer of size was complete, Ikenna’s penis had grown thicker, and reached eight inches in length, pressing down with added weight upon Thulani’s erection that had become thinner, and shrunk to five inches in length. Ikenna’s ball sac was now over three inches wide, while Thulani’s balls were less than two inches across. Ikenna snickered as another wave of pleasure began to course through the two brothers. “You always were smaller than me, but just look at you now. It’s obvious why father chose me to be the sire, and not you. You never could put out.” While Thulani looked dejected, Ikenna came a second time, moaning deeply as five spurts of cum even thicker than the last made their way down onto the mushroom head of Thulani’s reduced penis, smothering his brother’s own seed and covering his slit once more. As his brother’s cum began to ooze down the length of his shaft, Thulani came once more, releasing three smaller spurts of seed, the first of which only caused a bubble in the thick layer of his brother’s cum, with the second breaking though, and the third barely being a spurt at all.

Ikenna grinned wildly as he felt his cock grow a second time, gaining thickness and length over his brother who only diminished in size. Every time Ikenna’s shaft throbbed, Thulani’s penis grew tighter, as did his ball sac that was continually overshadowed by his brother’s slowly swelling orbs. Once the second transfer of size was complete, Ikenna’s erection had grown to nine inches in length, thickening up to match, and weighing down even more upon Thulani’s cock that had been reduced to four inches in length, becoming thinner as well. Ikenna’s balls were now a solid three and a half inches wide, while Thulani’s sac had diminished to one and a half inches across, mostly covered up by his brother’s bigger balls. Ikenna smirked. “Tell me brother, how does it feel to give yourself to me? To relent to the superior man?” Thulani blushed, looking down at his brother’s bulbous cock head that had grown so large it completely obscured the view of his own shaft that was now less that half of Ikenna’s size. “It… It feels amazing… Ashamed as I am to admit it...” Ikenna snickered once more as he felt himself about to have another orgasm. “That’s what I like to hear, dear brother...”

Ikenna grunted as he came for a third time, spewing six even thicker spurts of cum from his large mushoom head that slid down the underside of his erection, plopping onto the diminished head of Thulani’s penis, drowning out his brother’s cum, covering his slit, and further coating nearly his entire shaft with a thicker layer of seed than before. Thulani came in return as before, releasing only two small spurts of cum, with the first making a small bubble in the layer of Ikenna’s seed, while the second only made the bubble bigger, unable even to break through. Ikenna craned his neck to look down at his brother’s cum covered shaft, smirking as he felt his own penis grow once more. “What’s the matter? Didn’t you even cum?” Thulani blushed once more as he felt his cock growing tighter again. “I-I came… You just cum so much more now...” Ikenna laughed as his erection grew once more, gaining length and thickness over his brother’s shriveling shaft, while his balls expanded even further, dwarfing Thulani’s receding sac ever more. “It’s only going to get better, dear brother...”

After the third transfer of size, Ikenna’s cock had grown to ten inches in length, with his bulbous glans thickening up even more than the rest of his penis, while his balls were now nearly four inches wide. On the other hand, Thulani’s erection had shrunk down to three inches in length, looking quite thin as it struggled to support the weight of Ikenna’s now immensely heavy shaft, while his ball sac had been diminished to one inch across, so that it could barely be seen behind the girth of his brother’s swollen orbs. Ikenna grinned toothily as he felt another orgasm building. “Just think of how many tribesman I can sire with loads like these!” Ikenna reared his head back and moaned as he came for a fourth time, pumping six even thicker spurts of seed from the slit of his bloated mushroom head, that trailed all the way down the underside of his shaft to plop down onto Thulani’s small glans, flattening the bubble of his brother’s cum, and completely covering his entire penis with seed that now oozed down onto both of their ball sacs.

As Thulani came once more, he could only muster a single spurt of cum that barely made a noticeable bubble in the incredibly thick layer of seed covering the slit on his greatly diminished cock head. While Ikenna felt his next growth spurt begin, he smiled slyly at Thulani. “We’re almost there, dear brother. Soon all of your manhood will be mine...” Before Thulani could respond, Ikenna’s large erection swelled even larger, gaining more length and thickness, with his bulbous glans growing even more than before, while his orbs continued to bloat outward more every second. On the other hand, Thulani’s penis shrunk even further, losing more length and thickness, while his balls continued to recede even more. After the fourth transfer of size, Ikenna’s cock had reached eleven inches in length, with the head becoming proportionately larger, even as his entire shaft grew thicker. Ikenna’s sac now reached nearly five inches across, completely obscuring Thulani’s balls from view, the likes of which had shrunk down to a mere half of an inch wide. Thulani’s now even thinner two inch erection could barely hold up the immense weight of his brother’s huge shaft, as Ikenna’s large mushroom head nearly touched Thulani’s fat belly in between the weak throbs of his now tiny penis.

Ikenna breathed deeply as he felt yet another orgasm building, holding onto his brother’s wrists tightly as he groaned. Cumming for a fifth time, seven incredibly thick spurts of seed spewed forth from Ikenna’s fattened cock head, sliding down the full length of his huge penis to fully cover his brother’s small erection in yet another thick layer of cum, further covering his own balls that now hid Thulani’s sac from view. Thulani came once again, but the one meager spurt of cum he was able to produce wasn’t even noticeable underneath the heavy layer of his brother’s seed that covered his slit. Ikenna practically giggled as he felt his cock begin to grow once more, gaining even more length and thickness, as his head expanded, and his balls bloated further more. “This is it, dear brother! One more moment, and our father’s legacy is mine and only mine to have!” Thulani cringed as he felt his already tiny erection shrink even further, becoming pathetically short and thin, while his balls completely receded into his groin. After the final transfer of size, Ikenna’s penis had reached a full twelve inches in length, becoming incredibly thick and possessing a huge mushroom head, while his balls swelled out to reach five and a half inches across.

Thulani’s balls were no more, and his sad excuse for an erection had been reduced down to a single inch, nowhere near enough to support the weight of his brother’s phallus that now rested heavily against Thulani’s fat gut. Ikenna panted as he felt one last orgasm building within him. “Well, brother… its all over… Your manhood is mine!” Ikenna practically roared out as he came a final time, releasing eight incredibly large spurts of seed that washed down Thulani’s belly, and over his groin, completely covering it with his thick cum, and obscuring what little was left of his penis. Thulani felt as though he was having an orgasm, but nothing pushed its way from the tip of his shriveled nub, as his body could no longer produce even a single drop of seed.

Ikenna slowed his breathing as he released his brother’s wrists and stepped away from him as their bracelets stopped glowing. Reaching down with both hands, Ikenna stroked his foot long shaft, and fondled his five and a half inch wide ball sac. “Clean yourself up, and get ready to assist me...” Thulani looked distraught. “W-What ever do you mean…?” Ikenna smirked, and looked over his shoulder at his brother. “I intend to begin my role as sire immediately, and I expect you to help, so make yourself decent.” Ikenna laughed as he went to leave the hut. “Oh we’re going to have so much fun, dear brother! I can hardly wait!”