Fics like Infiltration of the Heart

When Princess Peach is kidnapped by Bowser, Mario always goes to rescue her, leaving Luigi behind. This time, she sends Luigi, Mario's younger, awkward, timid brother, to spy on the Koopa King and predict his next move. As he and Bowser learn more about each other and kindle a forbidden romance together, Luigi navigates a complex web of self-discovery, political drama, familial angst, friendship, and true love.

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