Yes.

"Okay. So - there're already two worlds, the additional risk from three is pretty minimal, but at some point we're going to have a problem."

"Yeah. Suppose we can solve it in advance?"

"...well, wizards can in fact sort of serve as Hell law enforcement if the right spells work on you - can I try Stunning you -"

"That does what it sounds like?"

"Yes. I don't even have to be in a scary mental state about it, and mostly it has no side effects but one person a class at Hogwarts will tend to wake up with a headache."

"How long does it typically last?"

"Couple hours, usually, but I can wake you up right away."

"I mean, wait a minute to see if I heal fast or something. Go ahead."

"Stupefy."

And now there is an unconscious demon sprawled on the floor.

He sets a timer. And then floats the unconscious demon and puts him on the couch. 

He looks very peaceful for about a minute and then his eyelids flutter and he blinks. "...What, was I in the way?" he wonders.

"Didn't seem very comfortable. Also, wow. It's been about a minute - 54 seconds, if I set the timer right, timers are confusing - so we can knock you out but not for long.

...are you okay?"

"...yes? Should I not be? I don't have a headache if that's what you mean."

"What I meant was that since we met your expression has most resembled 'happy' when I was mindcontrolling you and when you were unconscious on the floor."

"I have not been having a great few years."

"I would offer some form of comfort but I doubt there's much overlap in socially acceptable expressions thereof."

"I have no idea what's in vogue for comforting people among wizards from 1802."

"Uh, broomstick sports, chocolate, picking a fight with a juvenile dragon, plotting to take over the world, jumping off the Astronomy Tower..."

"...picking fights with dragons of any age sounds unsafe for people who are not indestructible. So does jumping off towers."

"I did not say we take our comfort in advisable activities. There's a spell to catch tower-jumpers, though, it's pretty safe, hasn't been a death at Hogwarts in two decades."

"...that's not the sort of death rate people brag about in 2179." Cam hauls himself off the sofa and goes back to his seat at the bar.

"I haven't even told you about Quidditch yet. If broomsticks work for daeva maybe it'll catch on, actually."

"Maybe. I'm happy to test it out."