Avoid the vague line "I would die for you." In WWII, sacrifice is literal. Does your heroine give up her last chocolate bar (a priceless commodity) to a starving soldier? Does the hero throw away his compass (sure death) to carry a photo of his lover? Small, tangible sacrifices are more moving than monologues.
Use the relationship to explore bigger themes: class, justice, ambition, or art.
Some fans favor the Justice League animated series portrayal, where a romance with
Instead, these narratives often explore: