I'm not sure specifically which 'Semper Fi Gay Marine's story' you are referring to. 'Semper Fi' is a well - known Marine Corps motto. However, without more context, it's difficult to detail the story. There could be many personal accounts of gay Marines and their experiences within the military, including issues related to acceptance, discrimination, and their contributions while serving.
One interesting 'Semper Fidelis Hunger Games' fanfiction could be one that focuses on a character's unwavering loyalty (semper fidelis) in the cruel world of the Hunger Games. For example, a story where a tribute from a district with a strong military - like tradition stays true to their values and comrades throughout the games, even when faced with the toughest challenges.