OK so you did the one where Fulgrim breaks Perturabo's heart, what did Horus do to poor Mortarion?
Oh friend you are so not ready for this
No one is ready for the emotional damage i'm about to unleash tbh. Content warning: I always hc Mortarion as intersex, and I go into a bit of details about it in here. Some body dysphoria and some... Mildly dubious consent happen too.
Mortarion, if Horus decided to fuck him for his stupid contest with Fulgrim.
The first thing you have to understand about Mortarion, is that's he's shy. Very shy. So shy in fact, most his brothers have ever seen of his skin is the area around his eyes. Most haven't even seen him without respirator.
One time, tho. He was on a compliance. And shit was taking time. His troupes are not fast, and this enemy was. It was a hard fight. But like always, he never complained.
But just as he was really starting to hit problems, another legion came to help, as they where passing by. Sanguinius.
And listen. Mortarion never spend much time with him. Never really cared. But he did appreciate not being stuck here for longer than he had.
He was awkward at first. He had nothing to say to the sunny, kind, beautiful boy that is Sanguinius, even if his brother was more than eager to know him better.
He still accepted his invitations to dinner once it was over. It would have been rude to decline. It would have made wave, pushed attention on him. He hated attention.
So he went over. And somehow. Somehow. Sanguinius had fish. Fish and veggies. All food he could eat.
He's pescatarian, you see. That's not something know, outside of his legion. Sanguinius had no way to know this, unless he specifically asked.
And that's. Touching. People never pay attention to him like that. People don't see him.
He take off his respirator. Show off some of his scars that way. And he doesn't ask. Doesn't stare either. They talk, and it's... Easy, to talk to him.
Sanguinius respect him. He respect and value him. Those are completely novel things in his life.
And... Well. He's pretty. Pretty in the way that nothing, on his home world, ever was. Pretty like angels were supossed to be.
Mortarion is shy, and unused to friends. So of course, the sweet fool, fall hopelessly in love with Sanguinius.
And he know, he know it's hopeless. Because Sanguinius and Horus have been a couple since day one.
So he pine. Softly. Without saying a thing. He watch, from far away, the pretty, kind brother, who never forget him.
But then... The entire mess with Perturabo come out. And well. It's disgusting, in his opinion.
He would have pity on Pert, if he wasn't so sure that just the sentiment would get his nose crunched in.
But then... Shortly after... Horus come to see him. All swagger and easy smile, deep laugh and wandering hands on his shoulders.
Mortarion is not an idiot. He know it's for the game. He know that Horus never even considered him as a potential partner before now.
He refuse, because no. Nope. He won't make a fool of himself. He won't fall down that rabbit hole.
But he start to realised that Sanguinius seem... More quiet. Almost sad.
He's not good at reaching out for others. But he can't let the one he care so much for suffer in silence. So he make efforts to see him more. To invite him over. To talk to him.
It take him quite a while to figure it out, but: Sanguinius does not like the game. He hate that Horus sleep around, does not consider him enough, when Sanguinius himself is solely dedicated to him.
It hurt. It hurt so bad, to see his angel treated this way. So he gritted his teeth, and did the only thing he could think off: he contacted Horus. Told him to stop playing, that it was upsetting Sang.
And Horus.... The bastard.... Took it the absolutely wrong. He think Sang is sad that's he's not paying attention to him.
And because he's a bastard. He offer Morty, who he know is pretty close to him nowadays, to come have a 3 way with them.
Talk about a deal with the devil.
He know ok? He know. That Sanguinius will never love him. That he will never have any chance with him.
But he also know it's the only possibility he will ever have to sleep with someone he actually like . It's damning his soul. It's a deal with the devil. But it's too tempting.
He accept, and he feel like a fucking slime for it.
When the day come, for what Mortarion assume is the biggest mistake of his life, he show up to their bedchamber, without armour.
Just that is so much for him, even if he still wear a hood and his respirator. He's greated in by an enthusiastic Horus, and a shy, smiling Sanguinius.
He can read in his eyes that he's sad tho, and he almost turn back.
He still go through with it. Sit down for awkward small talk, take a few sips of wine.
He let Horus pull him to bed. And then, he realise a critical mistake: he was so focused on Sanguinius, it escaped his mind that he will be naked.
He does not like his body. At all. It's covered in scar and thin and hairless and weird. He need a respirator to breath properly.
And well. He's intersex. That's his closest guarded secret, and he's gonna have to show that. His disgusting body, to Sang.
He's starting to tremble a bit. And Sanguinius, th angel, feel it... And gently kiss his forehead. Tell him it's gonna be ok. That they will take care of him.
Bits by bits, they expose him. Horus, for all his fault really do know how to be sensual, how to gently ease him up in Sanguinius arms, how to let him drop his clothes.
And when he discover his oddities, his barely there breast of the vagina under his penis, he seem delighted by it. Ask him if they can use that hole too.
He wants to say no. He had planned to say no. But. There's Sanguinius hands on his hips, making his brain trail off.
He accept, on the conditions that only Sanguinius can have that one. He just... He can't handle having sex, face to face, with Horus.
He end up on his knees between them, a trembling mess as they prep him. Sanguinius is mostly silent, while Horus has a running commentary on how tight he is, how good he's gonna feel, etc.
It's finally time. And they end up penetrating him, sanguinius in the front, Horus in the back.
And it's so much. Too much. It's not the hurt, that he can handle, it's being close like he never was before, with anyone, and he's shaking and it's becoming hard to breath and he doesn't have his respirator-
But sanguinius kiss him. Soft. Sweet. He kiss him, and urge him to lay on him, to rest his weight. "Breath" he murmure. "Follow my rythmes."
And he does. In and out. In sync with Sanguinius. Until he mostly calm down. Sang gently push his bald head down, tuck him in his neck.
"We are going to move now, ok? Just follow our rythmes. You are doing so good." God. The praise. It gets to his head.
He tried to stay quiet. He really did. But he kept making soft, sweet, cute noises. Gasp and lil moan, and there's two cock slowly building a rythmes.
Horus keep praising him too. But his words are different- he keep saying how pretty he is, making love to Sanguinius. What a cute duo they make. How lucky his pretty bird is to have his pussy.
The words and how he say them make his skin crawl, but he still endure as much as he can.
Horus is the first to cum. He doesn't pull out, doesn't even warn him, just go balls deep and full him up.
It make his skin crawl and he want to hide, he did not want that- but now sanguinius is softly panting in his ear, calling him wonderful, hugging him closer...
Sanguinius cum too, deep inside of him, and once more it make his skin crawl and he wants to hide.
Gently, he pull out, and lay him in between them. He's already starting to wiggle, trying to get away, when Horus hand him his mask.
He's so, so happy to breath properly once more.
He didn't cum. In fact, he never did before. He tell them as such, as they question him.
Horus seem to take it personally, and he's ready to prove him wrong with round two- but he's tired and doesn't want too.
He fall asleep like this, and with one of Sanguinius wings covering him... He can almost trick himself into thinking that it's real.
