February 3, 2525, Harvest:

When the Jiralhanae joined the Covenant, it was a blessing.

Like the other races they had been cursed by one defect that caused countless wars, countless conflicts, debates; and threatened multiple times to spark war in the entire galaxy.

Now they had been guided by a Luminary to a planet full of artifacts.

And the Gods had given them the ultimate gift to their daughters.

As the Rapid Conversion approached the Capital of the Planet to confirm what scanning had foretold; the crew went to any observation port to try and see it by themselves.

In a green, liveful; magnificent world, there were people, yes. It was a great opportunity for new convertees obviously. But it was more than that, was that these people had what they all needed: Men.

For there was a limited supply of them in all of the Covenant races; but here? There were enough so that each crewwoman could be surrounded by a personal harem for their pleasure.

And once they placed themselves in the surface of the planet, descending from their ship in the middle of the city; they looked amazed at these faintly-hairless-Jiralhanae-looking people. They could quickly identify who were the males and who the females were, as they seemed to be mammals like them.

So? The ten Jiralhanae of the Rapid Conversion, tasked with engaging with this species; decided to do something even better for themselves. Fuck them.

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And thus the Human-Covenant war began.

Not because of religious reasons, even if that was the excuse of the Hierarchs.

They saw a population that was half male and decided to take it for themselves; as breeding stock, as companions, as lovers.

But was humanity going to let itself be fucked into oblivion? Or their woman be cucked into extinction?

Every time the Covenant arrived on a planet, the humans had to try and destroy their fleets while they were too preoccupied with getting their fill of human cock to destroy their armies.

The Zealots and Silent Shadow agents were sent deep within human territory to scout for the perfect mates for the Hierarchs themselves.

Kig Yar Pirates began smuggling human porn and sex slaves from their raids.

Jiralhanae often were let loose in some human planets to rampage on the woods, fucking whatever human lost himself on the forests of their planets.

Sangheili swordmistresses ran themselves into close-quarters combat, to probe the strength of her prey, and when she faced enough resistance from one she liked; she just took it and ran from the battle with her trophy.

Drones often made nests on human worlds just to kidnap them and rut for days on end to expand their population.

The only ones in the Covenant that were dammed by this were the Lekgolo and the Unggoys, the first for not being able to normally reproduce with these humans, and the latter because they were denied if not for what they could buy from Kig-Yars.

Meanwhile, what could the humans do? They saw how their planets were invaded, and turned into breeding grounds; where all surviving women were made into servants for their new overlords.

There was no glassing unless they invaded a planet and deprived it of males fully to export them deep into Covenant territory.

They took huge amounts of casualties, and in Space combat, they always lost ships fruitlessly as they tried to board enemy ships; both for mates and for information on where they could find more planets for their new toys.

But the defense of the humans was heroic, no amount of Alien pussy was to intervene with the perpetual survival of their species.

Human marines decided to immolate themselves before being fucked into submission.

The Army and Airforce conducted operations even in conquered planets to kill as many aliens as they could, even if that meant themselves being fucked too.

The Navy did everything it could to stop the rampaging enemies from coming, eliminate their ships, disrupt their supplies, and evacuate as many of their brethren as they could.

Tales of Helljumpers going down from orbit to stop orgies of their antagonists were commonplace propaganda for the UNSC.

Virginity and celibacy became a symbol of rebellion against the Covenant.

And for both sides, the mythos of armored soldiers with numbers on their chests, that were so dexterous that not a single one of them was ever fucked by the Covenant. The Spartans.

Such was the tale of human prowess at blue-balling the Covvies that one Arbiter was tasked to find a relic to finally get all the human men they could; a Forerruner fleet they were sure it would provide enough firepower and speed to ride as much human dick as they could.

But one Ship, the Spirit of Fire, caused their entire campaign to fail as the planet of Ethran Harborage was destroyed in the fight, and the Arbiter died while trying to fuck one John Forge.

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In ten years, a huge swath of human-controlled space was turned into a hollow place, between human colonies overseen by the Covenant so that they could have infinite stocks of human dicks and barren worlds where only some surviving women remained.

The outer colonies that remained had either gone ignored by the Covenant, stalwart in front of the invasion and resisted; or had gone totally dark.

Thus, the war devolved into a slow grinding mess, in which the aliens were constantly baited with sex from heroic human bait; to then be blown by a nuke strapped under the bed. Demoralizing campaigns in which humans were shown refusing courtship from Sangheili were broadcasted, causing mass depression in parts of the Covenant. And some rebellious sectors had begun just whoring themselves to humans, requesting sex in exchange for protection and technology.

Thus, the Covenant had to limit itself, much to the dismay of everyone in the Empire. They had to limit the number of people sent there, for fear that the Humans would use their femceldom against them in such a way that the entire government fell apart.

To try and be as efficient as they could with this new paradigm ten years into the war; they sent one Supreme Commander.

Thel'Vadamee.

She was to, along with five other Commanders, subdue the entire human territory. A grueling task now that they had learned from their mistakes, and their technology was appropriate to combat the unending whore horde.

Meanwhile, the Hierarchs turned to try and quell their horny Empire in any way they could.

And so continued the war.

One man, Mr. Halo himself, the Master Chief, John-117, had the task, to kill these Commanders, and hopefully force the Covenant to sue for peace.