"As far as I know people have tried that once or twice and it did not result in a marriage."

"I think it had something to do with how I was planning to go marry Bella in Canada where it's allowed so I knew marriage isn't just meant to be for a man and a woman. Or something."

"I am still confused that we managed to be pioneers in this field even given that Canada was not previously known to Elfkind."

"I can warn people to who it might be relevant, unless the warning puts them at greater risk of it..."

"Oh heck, an epidemic of accidental Elf gay marriage, awkward... um, this is probably an infohazard of sorts but I'm not sure how well you can filter out all Canada-related information. Same policy's an ongoing political debate in the United States and some other places..."

"Well, I always meant to bring about social change after the war. 

Though some people sleep with the same gender specifically so they won't get married, and it'd be very unpleasant for them if they did."

"Yeah that would be a deeply unfortunate surprise. Maybe better to be clear and public rather than have someone audit the wrong poli sci course or take home the wrong newspaper and have an irreversible oops with a one night stand."

"I will make an announcement, if you two aren't worried that that'll make it obvious that you are the source of this information."

"...maybe see how her parents take it first."

"Fair enough. Good skill."

"Thanks."

And he gets back to work, only slightly distracted by considering whether to get married.

I'll follow your lead on introducing the topic to your parents, what do we do? Bella asks Lúthien.

I think I'll pop back to Doriath somewhere outside their line of sight, get my father to promise not to have you killed, and then get you.

I was not clear that having me killed was a realistic option here.

Since you'd just reset I don't think he'd bother. But it is not impossible enough for my tastes so I am going to make completely sure.

Thanks.

And she goes home. Extracts this promise from her father. Goes back. And brings Bella back to Menegroth. 

Bella shuffles awkwardly.

"We would like your blessing in marriage," Lúthien says firmly.

Oh they're going with that? Okay.

"Lúthien," says the King to Bella, "is the greatest jewel of Arda, and for no lesser treasure would I give up her hand. I meant to ask suitors to fetch me Morgoth's head. You've already done that. So bring me his crown, and you have my blessing."

...okay, it's not 'burn the gays', so there's that. "I'll, uh, I'll see what I can do."

He nods. He does not exactly look happy; in fact, he's glowering. But there were no calls to burn anyone.

"Thank you," she says, not quite making "sincere" but successfully avoiding "snide".