Fics like Heirs and Spares

L and Light are all that remain of the first generation of Wammy House kids. L's the world's greatest detective and Light runs the House cultivating a new generation of geniuses into useful positions. They're rivals first and family second. But Watari suggests, in case of emergencies, it makes sense for them to legally be each other's next of kin. Light's not so sure he wants to marry L, despite the logic of the suggestion, but L's seemingly on board with the idea. Or is it his idea in the first place...?

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