What’s the greatest “slow burn” romance between two characters in movies, television, or books?

You can feel the chemistry and longing between two characters who long to be together but something is holding them back or keeping them apart. Who are they?

*It doesn’t have to be in the romance genre, it could be an side plot line.
What’s the greatest “slow burn” romance between two characters in movies, television, or books?
What’s the greatest “slow burn” romance between two characters in movies, television, or books?
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