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I've always wondered about Idril and Tuor; an elf and a mortal couple in which the elf bride seems not to have been given a mortal choice (or taken it, in any case).  I vaguely remember that they might have landed on an enchanted isle where they would sleep until the end of time.  Rather harsh of Tolkien, I thought.  Perhaps he had some other idea in a later work I have not read, but I like your plot best.

Thank you! I'm glad you like my plot here!

The enchanted isles are canonical and apparently there were mariners who landed there and slept until the end of time. We don't know at all, I think, whether Tolkien intended Tuor and Idril to be among them, although it has been suggested that one of the two was the Sleeper in the Tower of Pearl, who is mentioned in an early version of the story of the Enchanted Isles and whose identity isn't explained. 

In the published Silmarillion version, Tolkien doesn't commit himself to any specific fate for Tuor at all, just hints that he may not be dead.