"Is there some reason I should get coffee in a different way or limit my use of my ability to get it this way?"
"Not any valid ones, no. So feel free to abuse your powers for unlimited coffee. Angel approval, want me to give you a stamp?"
Tony is back to talking to himself/Jarvis about technology by this point, although out of deference to their conversation he keeps it a little quieter.
"Nah. I will just make a note of it -" He waves his computer. "And cherish the string 'Adana the angel approves of the use of demonic magic to give otherworldly software prodigies coffee' for millennia to come."
Tony is apparently not too absorbed in his work to giggle at that.
Adana giggles, too. "The other angels will throw me out of Heaven if they ever hear. I'd have to figure out how to move to Fairyland."
"I'm reasonably confident they cannot, actually, throw you out of Heaven. I suppose they could throw you into concordances, but that only lasts so long."
"True. Hmmm. Then I'd have to move to a cloud far, far away from any cities. Keep to myself, never speak of my hidden shame. Approving of demonically made coffee."
"Fortunately nobody checks up on me at home, so all I have to do to avoid scrutiny is avoid attending any demonic events for a century or so. By then the shame of your approval will have worn off, probably."
"I've got some neighbors, they occasionally give me pie, so I would have to move."
"I'm all introverted and stuff. After I had a couple demonic languages mostly learned I moved away from the city. Presently I have my own gravity well."
"I'm still uh - working on learning the local languages. And getting used to being an angel. I mean, I'm a quick study but there's a lot to learn. So I'm in a city and asking for help from helpful neighbors."
"...What?" says Tony, distracted from his technological monologue.
"Yes," she says, quietly. "... How'd you know? None of the other angels I'd talked to had - they'd just appeared. No dying required."
"You're obviously new to angeling - but you know a lot of things about technology and whatnot for someone who's still picking up celestial languages. Also, a naturally occurring angel would... probably not have met a demon in the way it sounds like you did."
Back to the computer. She doesn't seem upset with Cam in particular, just - vaguely sort of traumatized. Computer, computer, not making eye contact with anyone in the room.
He doesn't know where Jarvis has cameras, so he's taking notes in a demonic language that was not part of the language dump.
Eventually he says, "Got it!" and throws a holographic blueprint in Cam's direction.
Cam looks it over enough to make sure it isn't going to, say, explode, and then he makes one of it.
"There's your wireless router," says Tony. He retrieves the object and ferries it over to a location where it may be plugged in appropriately. "Everything look good from your end, Jarvis?"