If you have a particular passion or knowledge, think about how you can bring that to play in erotica. For instance, I played in chess tournaments as a teenager, and logged many hours at the chessboard, so I’ve incorporated that dueling dynamic into stories, as well as everything from a bukkake party fantasy to my love of fishnet stockings to my lust for doing dishes. Because it’s fiction, you can play things up in ways you wouldn’t in reality, and experiment with other genders and sexual orientations. It’s clear when someone knows the world they’re describing well, whether because they’ve lived it or researched it. Try to find a way to make your story stand out; this could be by including detail about location, clothing, or a particular turn-on.