Right now they (definitely a they, right now) are kicking back and relaxing in a little no-tell motel. There's free wifi, at least, and the employee who discretely got them a room in exchange for clearing up a few issues also snuck them some decently filling snacks, so they're pretty much good to go until they decide to do something else. Or something interesting happens.
'They're an insubstantial kind of demon. You can't keep them out except with really expensive wards, so those are for children who haven't cohabited yet and everyone else doesn't sleep physically, they just let their cohabitor take over. But we can switch fast and be a little bit awake at the same time.'
She pats their backpack. There is a small mouse cage dangling from it. 'That's what mice are for. A lot of ours died on the trip though.'
'I put the sleepiness in them instead,' says Holly, who has been mostly dormant for this conversation but emerges to take credit for her magical prowess.
'How do you that? Did you invest to get it? Does everyone's investiture make them not need to physically sleep?'
'You said you put the sleepiness in the mice. What, is that some, I dunno, demon world person power separate from investiture?'
'It's troportation, anybody can do it.' She touches one of several colorful tags sewn to the inside of her jacket; and tag and jacket swap colors. 'Like that. You can't do that?'
'You also have demons and a flat probably-not-a-planet. It doesn't surprise either of us that you have magic we don't.'
'It's when you...take your heart...and invest it in something? Or someone. Do you not do that? I think we've heard that historically there have been societies that considered it taboo...'
'Well, then something's wrong with your mind talky thing because I don't know what else it'd be!'