I would imagine a future where he knows that she likes to go play with other people and he's super supportive even though it's not what he's into and everyone is safe and happy!!
I support this ending SO HARD.

Merlin is such an "Is this okay?" kind of guy. Embrace the characterization, Sophie.

Also, is it bad that it took me this long to put together that Freya's preference for the title "Monster" (aside from being totally brilliant) is a very obvious reference to canon? Ah, self <3