"Even my society's basically the same as his in terms of a dearth of healthy models of homosexuality and a whole lot of charmingly horrifying cultural assumptions. My Findekáno didn't need any help disentangling himself, but then I was not evil and deliberately fucking with him."

Which would tend to help. (Elspeth's mind flits through Earth culture on the subject - various fading prejudices, religious prohibitions, the fact that vampires can't fuss about it because in a contest between Literally Anything and Some Vampire's Mate the mate will win - probably none of this is useful unless Findekáno wants to watch adorable romcoms or something -)

"I am inclined to characterize his problem more as 'he felt safer in the situation he'd gotten so used to but without anyone holding power over him than he feels in a completely strange situation where everyone's horrified by all his coping skills for the former one'. He'll happily agree that Maitimo's terrible and exasperating and so on right until he gets a sense the rest of us actually want him punished for it, and then he gets defensive."

...out of personal affection or because then his skills are less useful or because he does not feel understood by anyone who wasn't there or what?

"Personal affection - some sort of very distant personal affection, but it's there - inability to hold a grievance - mine's like that too, mine's just still perfectly capable of cutting someone off if they're harming him - sense that my evil alt's the only person in the multiverse who actually wants him..."

...wants him in what sense? 'Cause Elves, like vampires, are kinda really pretty compared to most people and unlike vampires do not require decades of extremely hazardous practice to take advantage of that.

"I do not think being found physically attractive would cut it, but I can try pointing him at some nice galactic gay bars."

Or something. Although Elves may be a little excessively monogamous compared to most nonvampires.

"We're not actually hypermonogamous, we just take centuries to get over people. In the short term I suppose it looks pretty similar."

Well, leaving Findekáno like this for centuries seems suboptimal...

"And handing him back to my evil alt seems suboptimal. And we still are planning to do something about my evil alt, right, we are not just going to let him keep ruling..."

Remains to be seen. Elspeth is public relations, not policy, and the policy is yet unmade.

...The Golden Empire had to amnesty a lot of people just to not have to slaughter 99% of the vampire population. Evil Arda might be like that.

"I might be modelling my alt as 'pretty much actually Thauron' when I've only exchanged three lines with him and don't really have a basis."

Entirely too many people are actually Thauron but not quite that many.

"Well, we'll teach evil Arda's Findekáno the teleport and he can go where he likes with it."

Including right back where he came from?

"There's no way to quarantine the world with our current capabilities."

Is he likely to teach anybody from there to teleport.

"We can just not give him any necklaces; he couldn't teach anyone, he couldn't both remember the spell and have the learner remember it."

Will that in fact stop him or could he be induced to get ahold of one or reverse-engineer it or something.

"They took my father twenty-five years, I don't think they could be reverse-engineered much faster. Maybe with a demon for notes, though if you had a demon and something to offer them you could just ask for a worldleaper -"

And they don't know all of its adjacencies besides that they include Edda and Aurum and wherever their Enemy went...

...quarantine might be hard. Unless the Valar help or something.

"Might be worth asking them."

She can go ask them about that at the same time as she is investigating the dead Fëanáro. What should she be asking about the dead Fëanáro.

"I think if my father were evil he'd be - as he is but vindictive, instead of just wanting nothing to do with people who aren't loyal enough or who waste his time he'd want them hurt. He might still be okay if everyone around him had complete freedom of movement."