I have four OCs who as of writing this are the only OCs I have in a canon relationship! ^^
Bloodeater, Error 404, Kamentisa and Umbrilis are mlm and in a polygamous relationship with each other, originally I was only gonna ship Bloodeater and Kamen but ended up shipping Error and Umbrilis together too. Then I got thinking that each OC would actually go together nicely and I went "Okay you know what, they can all be gay for each other-"
Their backstories are still a WIP so I can't say for sure how all of them met, but Bloodeater and Kamen's families were good friends so they grew up together.
In their relationship Bloodeater is basically like a mama bear, he's a very protective person. Being the tallest he was sort of designated as Biggest Spoon(TM), Umbrilis being Littlest Spoon then, and he gladly allows the others to pile on top of him to watch TV. Sometimes though he just wants to be held and cuddled which results in him being encircled in a group cuddle or being the smaller spoon for once. If he's feeling particularly tolerant (which is most of the time because he's a big softie who adores his partners) he might also let them play with his hair and fur, braiding it and whatever else they wish to do.
Kamen is quite similar to Bloodeater with the above, but will prefer to be on the edge of any group cuddles due to him being prone to sensory overload. As much as he loves his partners, sometimes all the hair, fur and just warmer temperatures can get a bit much. It doesn't seem like it at first, but Kamen can be surprisingly light-hearted, due to his shyer nature than the others he tends to only open up that much to his boyfriends.
Umbrilis in every way is like someone's pet constantly having zoomies. This extends to being very excited to see and be around his partners, gleefully trotting about them and chattering away. He'll flop down on whoever is laying on the sofa or a bed and snuggle into them, he may act like an angry chihuahua around people he doesn't know or trust but the demon can be surprisingly sweet with those he loves.
Bloodeater isn't the only big softie, Error 404 also happens to be one and an absolute sweetheart. He doesn't like seeing others hurt in any way, so if one of his partners has a bad day he'll not leave there side comforting them and coaxing little smiles out of them. If Bloodeater doesn't want to be the human(oid) pillow, Error happily steps in. When he first met the others there were barriers due to his mutism, but they all managed to overcome them through writing and reading and them all doing their best to learn BSL.
I need to write more with them, especially stuff with them together, but here's a couple of things up on Toyhouse so far with Error and Umbrilis: