To make their stories stand out, writers should focus on the emotional depth. Explore the characters' insecurities and how the kiss affects them on a deep emotional level. They can also introduce unique plot twists. For example, after the kiss, it turns out one of them has a special power or a long - lost relative shows up. Another aspect is the dialogue. Write engaging and realistic conversations between Usui and Misaki that show their personalities and the development of their relationship.
Writers can make their Usui Misaki kiss fanfictions stand out by creating unique settings. Instead of the usual school or town settings, they could set the story in an exotic location or a fictional world. Also, developing complex characters beyond what we already know from the original source can be great. Give them new hobbies, fears, or dreams.