He might take it okay.

He might. Or he might think it's weird or suddenly worry that we're competition for each other's affections or something...

...yeah, he also might do that. Hmm.

And I'm not even sure his alts would be particularly useful predictors.

None of them had quite the same relationship with me, and of course not with you.

Yeah.

I'm not sure that we can come up with a plan better than 'tell him and be reassuring'.

Yeah, maybe not.

Fëanáro announces he's visiting space Arda, gets distracted at the hop through Hell, and decides to stay and look around.

The stopoff point for Hell is in the middle of nowhere, a cute little terraformed and furnished planetoid with a few emergency type supplies for anyone teleporting in some kind of emergency.

Awwwww. Loki's teleport can't take him 'somewhere cool and exciting in this dimension' but his wizardry teleport can target for 'near people'. He goes near people. 

Now he is in a really really tacky city! Some of the individual parts of it have a coherent aesthetic to them but none of them agree. Everybody is a young adult human-looking person except for having gone through an ethnic blender, and they've all got bat wings, and some have more exotic cosmetic alterations beyond that too - tails, horns, hooves, scales, fangs.

His appearance attracts attention; he is promptly asked in six languages whether he speaks those languages.

He doesn't but he would really really love to learn! He will point at things and ask what they're called and start trying syntax to get their reactions!

They find that unsatisfactory; they keep trying until somebody lands on English, does he speak English?

Yeah but he wants to learn all the other languages.

The demon who speaks English says the best way to do that is to conjure up the language section of the Library, and in the meantime if he wants to stick around in this part of Hell there's some neighborhood association rules, here's an English version of them.

"Okay, thank you." He will read those!

He is not supposed to make anything contiguous with someone else's structure without permission, nor anything ever in the middle of a thoroughfare. Making anything in the park and then leaving it there without permission from the Park Association is prohibited; the Park Association can be found inside of the really big tree in the park. The city observes quiet hours midnight-8am (UTC) out of courtesy for those who prefer to sleep. If you destroy somebody's stuff and they're not there to express other wishes you need to neatly finish the job, clear the debris if applicable, and put it back for them. There are some radio band use ordinances and a place to go for advice on compliance with those. Inhabiting the city constitutes agreement that the city council may issue binding arbitration if somebody complains about him.

...they think he's a demon! This is great! He bounces happily. The rules seem very reasonable and he is not going to break them on account of not being a demon. He wonders if he can cast Bella's bungalow spell discreetly enough that it looks like he is making it.

Well, he'll have to find someplace to put it first.

The demon who speaks English adds as an afterthought that there's a lady uptown who has always wanted to adopt a child ex-summoner, if that sounds like the sort of thing that might be useful?

"I already have two sets of parents! I have my mom and my dad but they're kind of incompetent and rule Tirion so they can't go on adventures with me, and then I have Bella and Rúmil who are actually good at it. But I would be glad to have some help!! I want a bungalow like Bella had in Tol Eressea and I don't see a place here I can put my bungalow!"

"Uh," says the demon, "if none of those people are demons you're not gonna have them here unless you get summoned and manage it then."

"Bella and Rúmil'll definitely summon me out as soon as they figure out I'm here and not at Space like I was going to be."

"You have some kinda spaceship accident?"

"No, I was just on my way there and then I came here instead."