He feels an open summons and lets it grab him -
"Okay, those sound familiar so I'm probably good if I come up with anything from the right era, let's see how much advanced software I can load onto something souped-up that'll still behave right with the internet..." Cam thinks for a minute, then produces a tablet computer with no visible branding, and starts looking for internet.
Once they're outside, she adds tentatively, "Sorry there's extra walking, I know you can just make things, but they probably want some kinda formal record? For bureaucracy's sake?"
Emma is extremely bad at not doing things that are Expected of Her. If he wants to skip obtaining a key, she will require convincing.
"I don't mind stopping to obtain a key to placate the bureaucrats. I'm still working out the minimum chain of backwards compatibility that will let me connect something modern to this thing." He waves his tablet. "I think I can do it in four steps but it'll be awkward to carry them all around so I'll probably have to do my computing in my base of operations, which for the time being is the apartment in question."
The lady at the desk of the housing office is not pleased to see them. It is the beginning of the school year, she has been deluged with requests from random students who did not have their acts together all week, and this... outfit... is entirely inappropriate.
"Key pickup?" Emma asks her when they walk in.
"Key pickup is for students who are following dress code," the woman says sternly. "It may still be August but shirts are still required here, sir, and that ridiculous devil costume is entirely unnecessary."
"I can oblige you on the shirt," says Cam, and now he is wearing a gray t-shirt with room for the wings. "On the subject of the wings and tail, you can have one of two things: you can have me take them off, or you can not have blood all over your floor, what's your preference?"
"But my appendages are apparently against dress code, Emma. Do you take me for some kind of rebel?" inquires Cam archly.
"Oh no. What a terrible destiny. Cruel fates that toy with me so, what have I done to deserve your ire?"
Emma gives the pile a quick glance through before handing it to Cam. "One key's to the building, the other's for your apartment. Uh, I think silver is the building one? Maybe?"
She gives the retreating back a scornful glare, and glances over at Cam (or rather, at his wings). "...so, um, I'm mostly crap at illusions, but I can try to cover up the wings if you want? Like, I could make them mostly match the shirt if you kept them folded, I think."
"What negative outcome besides me getting to mess with a key-distribution person are you anticipating if I continue to be flagrantly winged?" asks Cam, pocketing the keys.
In short it is not much of a risk, and even less so on campus; Emma just happens to be very, very risk averse.
"Okay, but if it weren't fine, are we talking someone unwisely tries to attack me or I am in some kind of sudden legal mess?"
"Selevy's pretty open minded, I don't think you'll see too much panic on the campus at least." She rolls her eyes. "And hundreds of precocious kinetic students later, we kind of collectively have a high tolerance for weird shit happening. You would not believe the number of things that have been made to float at one point or another."