The Valar announce that they've done as much as they can in Singularity (they can't bring back peoples' babies in that critical period either, but they can get them earlier versions) and are setting up portals between there and Sanity as soon as they are confident they've cleaned up the plague. A bunch of Elf architects have this wild idea for a fivedimensional city where alternating intersections are interdimensional portals between various Valinors and they get eagerly to setting it up.
"He doing okay? I didn't realize he was new or I'd have made sure he's situated first -" her eyes flicker -
"We have reason to expect he'll settle in quite happily."
"He was impressed with our flying thing but didn't have enough physics to understand it. I'd rather put off explaining it to your mom till later, before you ask, she'd want more than the overview. I don't mind if she takes it apart though."
"Oh, so you're only being mysterious about the sources, not the technology? She will be delighted. How long are you here -"
"I usually don't sleep but Timothy does so that'd be convenient if we wind up being here when he gets around to it."
"I can arrange rooms for each of you. You don't register as having chips, is that right -"
"If people are being mysteriously forked I do not recommend you make yourself susceptible. The chips are how we do money, if it's just the two of you I can just announce you're on my account or give you handhelds but if there is to be a plague of taciturn tourists I'll need a better solution -"
"But 'the mysterious substance in somebody's water' wouldn't do it? Are there things we ought to have and should be asking you to make us?"
"No, not at all, I forgot about that because I just sort of make one whenever I go anywhere then offer it to passersby, sorry."
"It's okay. I'm sure we'll have fun disassembling them anyway. Am I supposed to be taking notes for your later enjoyment or thinking out loud, here?"
"You speak Quenya like a native - slight accent which I'm guessing my mother'll pop in and tell me is consistent with so many Years of future linguistic drift but she can't guess that off my best osanwë description so it'll have to wait for her driving to endanger significant numbers of passersby and then her sudden presence in the palace to offend and confuse a few dozen people. Don't save her the time, she'll have fun telling me. Anyway, you aren't an Elf and I don't think would even tolerate us especially long - maybe your species is very quick to learn languages? But less the wings you seem like the same thing as Timothy and he barely has any Quenya. More likely, then, it's one of the magic powers that accompany the wings and tail."
"He could get wings the exact same way I did, he just hasn't asked me."
"The magic powers suite that accompanies the wings and tail is making arbitrary things and being uncannily well-informed - that part is obviously time travel, but some form such that 'back and forth' makes sense. Also you're not nearly upset enough for having destroyed a doomed timeline and leapt far enough back to change it. Either you do this routinely or it imposes no tragic costs somehow - or both? I can't figure out if you're testing me or just making my life more interesting - okay now I can, off your expression, you're just making my life more interesting."