Due to the course language & mature Themes, this fic is rated as so (but contains no Smut, sorry)

In the back of his mind, Jim repeats to himself, 'This can't be happening! This can't be Fucking Happening!'

He gulps in air as he staggers to the nearest wall, his skin crawling with electricity and blood feeling like heavy beads rolling down a string through his body, his pulse uneven and jumping at the ship's every sound, especially to that of his own making. The black walls seemed as if to close in, until he felt as if he were recycling the same air, his sense of smell heightened considerably also in the past one-hundred-twenty hours of the one-hundred-sixty-eight hour duration of his 'inhuman bodily functions', being those mutated within his genes since the human Earth population dwindled between two-billion and two-point-seven-billion after the tyranny of Khan had reduced their numbers from the all too healthy seven-billion and three-billion on interstellar colonial missions. Yes, oddly enough, every male of the human species in the underground Starfleet were made to have Heats, as were the women, which borne human and half-human children from interspecies mingling, thusly appearing as if the Earth Humans have reverted back to beasts in Khan's eyes. The dictator never the less had 'fun' with all sorts of these unfortunates whom crossed his path.

Kirk took another breath, ignoring the heavy swell hanging painfully against his thighs, the cool walls did little to effect his burning skin, he felt as if he were expanding and imploding with each step on the inside while he made it his goal to find a pod not locked out or damaged. The phaser at this side was useless, the energy long ago converted to contact the side Starfleet still loyal to Earth, and Kirk's current duty before being hit by the voting of his own hand: establish contact with the human colonies scattered in the universe, request assistance in overthrowing Khan and his superior race of humans. It all sounded rational as Spock would put it, and yet because Kirk was hit by a sudden Heat, he was useless to the Federation, completely MIA if Khan or any of the crew found him wandering the halls with stolen codes and maps of the remaining human colonies, he clutched the data-loaded PADD to his chest desperately wishing that Bones had given him extra vials of hormone suppressant.

Being ever active in sex or up to the sport of it, Kirk was made an Alpha: the seeker of a mate rather than an Omega, the bearer of children - hence, his difficult ability to go Into heat, yet inside the battleship he stood dripping of the need to penetrate or be penetrated. Either had his swollen cock dripping heavily and twitching spasmodically inside his crew uniform. He did everything humanly possible to calm down, to keep his rigid muscles lax to allow him movement, his gray uniform scratched though it was a soft material, his lungs full though feeling as if he was not breathing enough or taking in oxygen which was too thin in the overpowering aroma he emitted from every sweating pore. The ship was void of Alphas, Kirk could taste the flat blandness in the air, steps approached and he pleaded to himself, 'Don't find me. Whoever you are please Don't find me!'

Instinct shouted his muscles to run, his hands to fall into fists, his body to Stop begging and for the delicious Thing advancing to pass right by. In the sparsely lit hallways between battle stations and the life preserver shuttles, Kirk only had to run, insert the override codes and get the hell off the floating militarized space junk, but he was tired of running, a nice nap felt as good as it seemed. Thoughts of rolling around naked alongside a willing crewmate kicked his heat into overdrive, his limbs freezing to the spot against his protests, his heart jumping up into his throat and down into his stomach, his cock swelling again to the point of insanity as he felt himself leaking hot strands of precum to the floor, the side of his brain solely thinking Save Earth Plans shut down completely, the side where his newly-injected genes dictated pushed him to such lengths - Kirk began to whimper.

At first a quiet wheezing at the back of his throat, then slightly audible gasping, finally to full-on sexual sobbing, anyone on the same deck level who heard through sound waves at that moment was most likely to have an erection like their own arm reaching into the air for anything to fuck. Tears burned through Kirk's eyes, his body felt all too hollow, his body refusing to search out a potential mate since his limbs locked together in a tense heap of need and nature becoming two forces at war with another, a war greater than that waged between Khan's species and Earth's humans. Kirk's lips lay open, red, swollen from being licked and sucked through his teeth, his hair beginning to cake against his skin, his uniform now completely saturated and his scent wrapped him in tantalizing screams of 'Now! Fuck me Now! Somebody! Anybody! Anything! Please!'

And the footsteps halted before him, not knowing he was staring at the floor, Jim's eyes roved towards the boots which encased long legs in black pants, leading to a strong upper torso and robust arms, finally upon pale skin, amidst everything he tried to see Kirk saw a potential mate standing before him, the scent mingling with his own putting his body into a further trance where he shakily whispered, "Please…- please-"

The following voice shoots straight to his groin, sparking nerves on the way while his mind goes on aimlessly in the other man's answer, "No."

With his body swimming in hormones, Kirk processes the answer, his body then takes flight to find another who would fulfill his animalistic demands, but already he is being thrown upon a shoulder and taken, he squirms crudely against the person carrying him to a place he would rather like to have a bed than a boring shuttle.

The Shuttle! Starfleet! Khan!

Against the shoulder and solid arms hauling him to possibly a solitary cell, mind made up, Kirk surges with the inhuman strength his heat has given him to force himself out of the grip, he powered with all his might forward to the shuttles just half a kilometer ahead, his legs pumped as did his arms as much as they could without tripping on one another. He fell into the door of a shuttle just as he slapped the open-button and smacked the emergency lock, not before that same particular Thing slid in through the closing door, locking them both inside the shuttle. Jim stared in horror at first, the emotion ebbing away to the grimace holding tight in his jaws, he hissed, the person before him had the same unreadable expression yet was betrayed by the cold twinkle in his eyes, the slight turn in his thin lips. Kirk then fell to his knees, his hands slipping from the console and legs unable to give him the strength to stare down the man who single-handedly enslaved the human race.

Khan, though claiming to be superior, stood as an artificially intelligent human would: still, calm, in control, seemingly unaffected by Kirk's need to be fucked, claimed, broken inside and out until the genes replacing the feral human's own subsided to it's completely human element. Khan felt the damning gaze of the former captain, blaming him solely for all the problems caused, which was a fact, Khan preferred to be the end of an inferior species than the father of an age of supreme beings marching about and waging triumph over the lesser beings, yet, his body worked strictly to it's own accord. Training tirelessly, brain calculating and storing information, he was aware of his own self Evolving at the speed of months than the millions it took to have made homo sapiens out of the grunt-faced homo erectus, thus, his body learned on its own how to sniff out the genetically embedded gender roles of Alpha, Omega, Beta and their ten-percent Omicron children.

The mere idea of humanity falling from the very pedestal they had built for themselves and being replaced by him, Khan both hated and Loved the concept that he will Never be subordinate to any other than the limits he had set for himself, and still his every fiber craved James Kirk. The man's skin, the man's every thought, his every attention, everything human and Himself he could give to feed the supremacy Khan had been genetically fitted and engineered with, and here he was standing for what seemed like hours not at all trying to alert the ship of the mutiny. He stepped forward, earning a growl from Kirk, Khan was helpless to his own newly evolved genetic makeup: claiming Jim, because he was also an Alpha. Without him understanding, Khan had become an alpha a year prior to the genes supplemented to Earth Humans going global, yet most of him remained the same: never fraternize among your inferior.

This time he had never encountered among the population nor his own prisoner-crew an omega five days into heat and never having had the time to quell the overpowering hormones dripping sex by the bucket, their eyes burning so much unwanted yearning and barely-hidden disgust at the same time as Kirk had been doing since escaping the crew's quarters under false pretense of going to medical bay.

Unable to react, Kirk flinched as Khan's hand came under his chin and lay across his neck, maybe curious of the color Kirk would turn if he were to be strangled mid-heat, he held the PADD closer to his chest and breathed evenly through the light grip only gracing his hot skin. He knew in the back of his mind the animal clawing up to the surface of his skin, wanting to be thrown to the floor and used until he was impossibly impregnated by an entire race, Kirk kept his stance defiant, unwilling to let Khan have his way though his body shuddered from the empty chaos which lay within him, needing an organ, a solid Object to replace the coiled hollowness inside himself. Khan's growl turned his body into a quivering wet mess before he righted himself and used his spare hand to confirm the coordinates he had been punching in quietly while he had Khan distracted, he pressed the keys upon the console to sanction the coordinates, he only had but to wait for the shuttle to charge fully before deploying to the most densely populated Human colony in the universe, one which awaited patiently on standby for further instructions on liberating Earth's human race.

To Be Continued with Smut, it'll be on Ao3
for now, this fic is just a standalone & is my very first Star Trek/Heat fic

thank you for reading :)