He feels an open summons and lets it grab him -
"Relax, wouldja?" Jenny replies cheerfully, poking Emma in the side before she returns to the drawing in front of her. "We get to draw circles on the floor for a day, instead of memorizing yet another type of magipathy, or whatever. Here, you know languages, write something fancy on the outside."
Emma sighs (wasn't Jenny the one who wanted to take this class in the first place?) but does as Jenny says, scribbling on the border of the circle in Latin. After she exhausts her Latin vocabulary, she writes the remainder in Spanish. She contemplates the circle for a minute, then adds a few random Chinese characters into the empty spaces. (In for a penny, after all.)
"It looks so niiiice," Jenny beams. "Here, you finish the loops, I wanna show Professor Reed." And off she trots to fetch the professor from the other side of the lecture hall.
Emma rolls her eyes fondly and finishes the looping curlicues Jenny had begun. Show Professor Reed what? Everyone knows summoning circles don't work.
Cam glances around. This is more crowded than most demon-summonings. Also, this is a terrible circle. That's what, three different languages in the circle? She's letting him talk but he doesn't even know which one to start with. Maybe she'll talk first.
"I'm not an illusion of any kind, what are you talking about?"
Behind her her classmates are starting to gather around curiously. Professor Reed does not often admit to confusion. Murmurs start to rise: "What happened?" "What'd they do?" "Lookit those wicked wings! "
"Introduction to magical what?" says Cam. "What did I land in? This is the worst summoning circle I've ever seen." He shifts his wings a little when someone comments on them.
Emma looks at Jenny incredulously- the aesthetic qualities of the curlicues are the concern here?- and then turns back to the circle. She takes a nervous step back, but as long as she doesn't know what's going on, she decides she might as well answer the question. "Um. It's just class. College. We're freshmen?" She gestures around her to the crowd. A few wave.
"It's very pretty, if linguistically bizarre, it just isn't very good. I mean, obviously it worked but it's missing all your standard precautions and you're lucky you didn't get somebody mean. What kind of place is having freshmen summon demons in unverified circles, what did I miss?"
The murmuring has picked up at the word 'demons'. A couple students have pulled out crosses and are holding them nervously. The noise ceases at a look from the professor, but the crowd is now much more obviously nervous and the crosses have not been put away away.
"Why don't we start with you," Professor Reed says finally. "Ideally with the part where you are apparently a literal demon, as those are- supposedly- as mythical as working summoning circles."
"But Professor Reed, demons are-" one girl starts, sounding mildly panicked and clinging to her cross for dear life.
"Ivy, we have no idea what is happening. Remember, never assume things about magic." She eyes the circle. "Especially right now."
"Sorry, what year is this? Last I checked summons and demons and so on were common knowledge as of a century and a half ago, and you said this was a magic class, you don't need an entire university-level class to teach non-summoning parlor tricks."
She manages to pull herself back together, and straightens. "I apologize. You were saying something about demons and summoning circles..." she prompts.
"And where you got those wings!" a boy in the back yells, to giggles.
"I made the wings," sighs Cam. "And the tail. They're very fashionable. And where I'm from, it's 2159, so you've managed to pull me either back in time or to an alternate universe with your incompetent circle, and given that little spiel about magic I'm guessing alternate universe."
And then the rest of his speech sinks in. "Alternate universe?! So..." she looks down, and shrinks in on herself, "...can you get home? I don't- it's not- I don't know how to undo this."
"Were you the person who made the last mark in the circle?" Cam asks. "It felt like a normal summon from my end, so I doubt every rule of the magic I'm accustomed to is suspended, which means you can probably send me home the usual way."
Best to know what's she getting into by replying.
...What if she has to give up her soul? Or go back to Hell with him? He's a demon! She doesn't know how this works.
Someone in the back of the class calls out an extremely inappropriate suggestion. Emma turns bright, bright red. For lack of a response (that she could make in front of a professor), she ignores them entirely.
"Usually, you summon a daeva of any of three kinds of which demons are one, and we're stuck in the circle till you get rid of us or we agree on a task and a payment. The lewd remark was presumably facetious but it's not unheard of, but relax, it's not my speed. But you didn't make this circle very well, so I can do whatever I want whether I do you a task or not. If I tell you how to get rid of me when are you planning on doing it, may I ask?"
She turns back to Emma and the circle. "If you plan to stay for any length of time, Mr- I didn't catch your name?- I would appreciate a little more detail on what, exactly, demons do. Cultural bias, you might say." She is carefully not looking at the students with their crosses out. "And how you were planning to do things like eat."
"My name's Cam. I can stick around a while, nothing pressing to do at home, but I would object to staying for more than eight years because that's when we get a concordance with Limbo and I want to interact with the postal system. ...I'm assuming here based on the fact that you speak recognizable English that your years are like Earth years back home. What demons do depends on the demon; what makes us demons is the ability to use demon magic, which is - making things." He conjures an ice cream cone. "Including things like food, so you don't need to worry about that." He licks his ice cream cone.