Another suggestion is Carol M's two stories. The second deals with the NKers, although the first is helpful to see the whole story. Both great reads.
In Sickness And In HealthWhat if Lois hadn't been switched for the clone until
after the wedding? When Clark finds out that he's her husband, he takes steps to remove her from Deter's "care."
Till Death Do Us PartA New Krypton story in which Lois and Clark are married when Zara tells them that she's already married to Kal-El. And there are dire consequences for everyone involved if Clark won't renounce Lois forever. Sequel to the author's
In Sickness and In Health.