Well, you could start with the official forums related to the series or game that Clementine and James are from. Sometimes, fans post their fanfiction there. But for a wider selection, AO3 is still the top choice. It not only has a large quantity of fanfiction but also allows for different ratings and tags, so you can easily find the type of Clementine x James fanfiction that suits your taste.
Archive of Our Own (AO3) is a great place. It has a large collection of fanfiction from various fandoms, including ones about Clementine and James. Just use the search function and type in their names, and you'll get a list of relevant stories.
Fanfiction.net also might have some. You need to look through the relevant categories or use the search bar. However, AO3 generally has a more organized tagging system for this kind of content. Another option could be Tumblr. There are often fanfic recs (recommendations) on Tumblr blogs dedicated to the fandom, which can lead you to some great Clementine x James fanfiction.
Chapter 356, "I announce, Lili is the best of the night!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 506, "The Female Devil Can Die", is the clearest early answer because it turns President Shang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Nearly three teams had been squatting in surveillance outside the...
Chapter 523, "Are the Researchers Sweating Profusely Now?", is the clearest early answer because it turns Researchers Sweating Profusely's situation into a concrete plot event. It opens with This is supposed to be a life-saving 'peace charm' tailored for the...
Chapter 519, "I'm Here to Participate in the Program", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Seeing that everyone who went to attack Jiang Li had failed...
Chapter 451, "Where Did This Madwoman Come From?", is the clearest early answer because it turns Was Sister Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Upon hearing this, the three people turned their heads in unison.
Chapter 401, ""Youth Trainee" Premieres!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with With Huo Xuan's help, Jiang Li quickly got rid of the fans and was...
Chapter 197, "Dear Brother", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Seeing that no one cared about what she said, Su Yinwan immediately...
Chapter 527, "Shaojing Bro, I'm Sorry", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jiang Li, taking advantage of these people's inattention, had already...
Chapter 618, "Abandoned Again", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Upon hearing this, Jiang Cheng looked at Su Yinwan in disbelief.
Chapter 353, "He's Lying!", is the clearest early answer because it turns Boss Shi's situation into a concrete plot event. The setup is The three of them turned their heads together., but the pressure keeps building through Approaching was a portly middle-aged man, his slicked-back hair....