Sadde's running.
Not for any particular reason, just because it's faster. He's been meaning to go to one of the capitals for a bit and now, he supposes, is as good a time as any.
And eventually he's not running anymore, because he's close enough to civilisation that someone might spot him. Not that he wouldn't be able to notice them by scent before they saw him, but still. And as he makes his way to the Norway capital at this more leisurely pace, he notices the tiny, shiny key. He walks towards it and picks it up and immediately notices just how magic it is. He can tell by the way the key feels like things, and different things depending on where it is.
He verifies that what the key feels like is consistent in absolute location by waving it around a bit and seeing that the same place always feels the same. "Huh," he murmurs to himself.
He straightens up and thinks. The first obvious thing to try is seeing whether it opens any doors—a universal skeleton key sounds like the kind of thing a magical key could be—but the second obvious thing can be tested right there and then. He pushes the key into thin air with some purpose, as if he wanted to unlock an invisible door, and then turns it, et voilà, the faintest of door-shaped outlines appears before him.
He locks the door, and it disappears. Unlocks it again, and there it is. So he pulls it open and sees—
"Okay, so I'll make a male basement dweller in case it's complicated in some way, anything else I should know?"
"Okay. Lacking a basement I will just stash it in the closet." Cam goes to his closet, makes a squishified vampiric winged male Sadde basement dweller curled up in it, and leaves it there.
"...it might be. See if you can appear a vial of my venom? Glass, venom doesn't corrode glass."
Cam makes one. "This doesn't necessarily mean there's nothing irreducibly magical about it, just that its existence as a substance isn't magic," he observes.
"Like, if I try to make a magic rock, and I try in an insufficiently conditional way, I might wind up with a rock, just not a magic one."
She sticks a finger inside it and a tiny hole appears on it and it starts leaking venom into the syringe. After she's done she closes up the hole and goes apply the venom to her basement-dweller self.
"This is really creepy," she says, and sticks the syringe into its jugular. She fills it with venom a couple more times just to be sure.
Presently she returns. "Should take a few hours, I suppose, if it works."
"I don't, we can wait more than I'd expect it to take, like, say, twelve hours, and then try attaching them to me again."
"Exactly how much sex do you need to have before you can spend more than a couple hours at a time thinking about anything else, I'm honestly curious."
"...that's not really how my brain works. I can't generalise from my own experience to other vampires, but given the number of thoughts I can have going on at the same time, and given that I'm mated to you, I don't know if there'll be a single second for the rest of eternity I won't spend thinking about having sex with you at least a little. That said, it's not nearly as much of an insistent priority as it was when we met."
"I mean, I'm not spending my average day doing anything especially productive and sex is certainly a pleasant pastime but I do like variety."