In Skyrim, I want to marry Serana, the follower you get from the Dawnguard quest series.
Is it possible, if not, will it ever be?
As to will it ever be possible, anything is possible. You are certainly not the only person who has suggested this, and it is not unreasonable that this option could be patched into the game in the future. There is even a petition here to encourage Bethesda to add this option. As of right now though, there are no plans to make marriage an option.
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