I wrote this instead of doing the writing I get paid for- I dunno why it’s heavily focused on Ominis’s role in the relationship because I’m more of a Seb girlie, but there it is…
Head Canon for (Poly!) Silver Trio:
Ominis is Mom. Even when (afab!)MC has children, Ominis is Mom.
MC and Sebastian got together first.
Ominis was the one who asked MC out for Sebastian after he’d been agonizing about it for weeks. MC and Seb were physical long before they were an item or ever went on a date, but Seb caught feelings, and it was stage 4 inoperable. Ominis got sick of hearing about it.
Ominis: MC are you busy tomorrow?
Ominis: Neither is Sebastian. You two are having an outing. I will plan it. Wear something comfortable.
Following the Ranrok Rebellion MC has PTSD. They still have a lot of vibrato, but they can’t understand why they become reclusive sometimes. Why they panic over strange little things.
Sebastian kind of gets it. He doesn’t. But he’d kill for MC and has. He will wait if they need to be alone- he’s like a dog waiting at the door, and he doesn’t really get why he’s not allowed inside.
Ominis though- he REALLY gets it. He was raised in a violent house hold. He’s always admired MC for the way they throw themself into everything- not unlike Sebastian, actually. His two gremlins… but now there’s something quiet about MC that he understands that no one else does, and he changes because of it. He’s softer. And admiration becomes love.
It almost breaks Sebastian.
Because no one gets him like MC. And how can MC just… have that same connection with Ominis? It eats him up inside until one day he can’t hold it all in and he turns on Ominis.
MC has to intervene. And it’s a very long conversation- uncomfortable. MC loves both of them the same and different… They will always be birds of a feather with Sebastian- electrical fire, bursting between their veins on contact, closer than close. Always daring each other to climb higher.
But Ominis is silence in a storm. A safe place to hide. Water to soothe a burn.
At first- Sebastian isn’t good. He doesn’t tolerate anything sexual between MC and Ominis and MC doesn’t even seem interested in Ominis that way… and that’s almost worse, because Sebastian can’t deal with the fact that MC’s connected to someone else in the metaphysical sense. Especially his best friend.
But. He comes around to it. Seb is bi. And he’s always found Ominis attractive. Once the initial sting of betrayal is gone- and it does fade, he sees MC and Ominis in their quiet moments and he aches to be with them. So he’s the one who starts things.
One evening when things take an intimate turn with MC, Sebastian takes them to Ominis’s room instead of his own. Ominis is shocked- but it doesn’t take much convincing from Sebastian when he’s invited to touch MC… and then it’s a regular thing.
Ominis was never really looking for a relationship. Scared of intimacy resulting in disappointment because he won’t marry, and he won’t have children- the Gaunt line MUST end. But this doesn’t demand any of those things from him. Sebastian asks Ominis’s permission to marry MC and it’s granted. Ominis is Sebastian’s best man. He goes with them on the honey moon and he lives with them when they buy the stone cottage on the coast. His room is attached to the one MC and Sebastian share- and sometimes, especially when the PTSD is real bad, MC sleeps in Ominis’s bed. And more often than not, Ominis sleeps in theirs after evenings of passion.
MC gets pregnant with Sebastian- and Ominis almost leaves. He’s terrified he’ll be trouble for the child. But Sebastian is the one who convinces him to stay, because he knows that in all the ways that he and MC will fail this child- Ominis will not. Ominis is responsible where MC and Sebastian are impulsive. Ominis is gentle where they’re all fire. And Ominis is stern where they are lax. Between the two men, there’s got to be one good parent.
And after that? Ominis is all in. The domesticity is in full swing between the three of them. Cozy nights on the sofa, watching the baby kick inside MC’s belly, to MC’s horror- which they laugh about. Ominis knowing exactly what they need to cure morning sickness and edema. Sebastian becomes a rock for MC in ways he wasn’t before. He becomes their advocate. In his typical burn the world for them fashion, he’ll cut a bitch for not giving up a chair for pregnant MC. He’s up to his ears in research, parenting books, the latest in obstetrics medicine, dietary requirements. He’s up all night. And literally for days after the baby is born, just staring at the bundle in his arms, and doting on MC. It’s Ominis who finally gets him to go the fuck to sleep.
Ominis is independently wealthy. But he’s always worked a quiet job at Gringotts, in management, so that he can keep an eye on MC and Sebastian as cursebreakers. When the baby comes, he leaves his job to be a fulltime parent. And when that maternity leave is finally up, MC and Sebastian get to return to their life of adventure and come home to be loving parents (and they are great parents) but it’s Ominis who is fulltime Stay at home dad.
And honestly now he just has three kids.
But he’s happier than he ever thought he’d be, and when MC has two more, he’s over the moon. Those kids go to Hogwarts too, and Ominis never misses a Quidditch game, or the chance to get his little trouble makers out of a jam. He has pull with the Headmaster after all.
The youngest’s middle name is Ominis.
Sebastian never comments on the fact that the youngest baby has Ominis’s coloring. Ominis is blind- and he doesn’t need to know. He loves him anyway.
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