What does Priam's room/bathroom look like and would he let us (re)decorate it if we asked very very nicely?
He would! The typical werewolf man that he is, he's not exactly organized; there's tufts of hair rolling around with dust bunnies and a general sense of clutter in his bedroom. Since the bathroom is shared Antón insists on keeping it clean and spotless, but Priam's personality shines through even there with his hairy brush on the counter and dribbles of toothpaste on his toothbrush holder. Otherwise, his bedroom isn't gross or dirty, it's just disorganized. He's got clothes in a pile on the floor and his gym bag kicked under the bed, a laptop open on his desk with his notebook filled with chicken scratch beside it.
There's a few photos of him and his moms taped up by the window that he wouldn't want moved, but other than that you're free to decorate as you please because Priam really doesn't mind. He likes your little personal touches in his room, it makes it feel more like home. Plus, your smell helps him sleep, so he'd gladly cuddle up with one of your little plushies or a hoodie you left behind just to feel like you're close to him.
♀️ It's even more true if you're carrying his pups, because Priam goes into nesting fever wholeheartedly. Every soft item of yours in his room is liable to become part of his stash, a whole cushion of blankets and pillows and clothes pushed up in the corner for him to cuddle you in and rub your belly. So if you're a clean and neat person, your influence on Priam's room will probably only last so long before he's sweating all over your blanket nest while he claims you with little bonding bites all over.