Chapter Text
There were many ways to describe the ultramar system.
Some called it a nationalist empire, the perfect achievement of the will of the Empire. Other called it Paradise, as the robust infrastructure and public service made it possible for hard working people to make an honest living. Others, in whisper, would mention that it had been built on the back of slave builders, in time not so long ago. That ancient traditions of bloodsport and cruelty were not quite extinct in many minds.
But all, from the highest senator to the lowest peasant, could tell you one thing: it was efficient.
This efficacy was built in the foundation of the empire itself, and best exemplified by their Lord and Primarch, Roboute Guilliman. The capacity to not only organise an army, but literal worlds, was probably one of the most prized in the galaxy. And one person above all knew how essential this skill was.
Horus.
Which was why, at the moment, he had his younger brother pinned down on the desk he used to work in, on Maccrage. Roboute was bent over, a hand firmly placed on his mouth to stop his moans and screams of pleasure, as Horus kept pounding into him.
His laurels were askew. It was cute.
He had come over for a surprise visit, simply to "catch up" with his charming blond brother. Roboute was always so happy to see him, opening his arms wide at his view and truly treating him like they had been raised together. Even Euten liked Horus, and he considered earning this woman's respect and affection one of his proud moments.
Which only made the current situation even more slimy.
He needed Roboute on his side, in the upcoming war. He needed alleys that would be able to plan better than anyone, and Roboute was the best candidate, the most important card in the balance.
So, quite innocently, he had offered for Roboute to accompany him on a quick expedition. Just some annoying xenos! In and out, where the two primarch would get to fight for once and let loose a bit. Roboute didn't have to know, that everything has been carefully crafted for him to fall to chaos, if he followed him.
And that was the problem. If.
Once more, Roboute's biggest asset was proving to be a liability to others' plans. Horus could not have known, but Roboute had actually a very full calendar in the upcoming weeks, involving a program that Roboute was putting in place for off-duty ultramarine to integrate a bit more into society, and do things such as infrastructure construction.
Horus used to have that kind of project for his sons, not so long ago.
But the sad truth was, no amount of charisma that Horus could use on Roboute would have made him change his plans. As such, he used his second best negotiation tactic.
Sex
Sleeping with each other was quite common amongst primarch, and Roboute was well acquainted with Horus' cock. As such, it had been no hardship at all to convince him to have a quicky, between two important meetings.
The desk creaked dangerously under the strength of two primarch. It only made Horus go harder. He saw the reproachful glare Roboute sent over his shoulder, and he laughed, kissing the back of his neck.
"You are too easy to tease, Rob." Purred Horus, one hand slowly jacking his brother's cock. "So why don't you take that well deserved vacation, and come with me?" He licked at the neck under his lips. "We could have this kind of fun all the time ."
Then, perfectly timed, he made Roboute cum with a shout that was definitely heard outside the office. And yet, as he exited his Brother's greedy hole and let him catch a breath, he was surprised to see him smiling.
"You like to play dirty, Horus." He teased right back."But I really cannot leave my sons right now. Another time, perhaps?" He offered instead.
It was a shame, really, that Roboute wouldn't accept.
He would have to fall, like all the others