Some Reddit communities dedicated to the fandom might also be a good source. For example, subreddits related to the original work that Richie and Eddie are from. People often share and discuss fanfics in those communities. Additionally, some Wattpad users may write 'richie x eddie lemon' fanfics, so it's worth taking a look there as well, although the quality can vary.
You can also try Fanfiction.net. While it may not be as focused on this particular pairing as AO3, there are still likely to be some 'richie x eddie lemon' fanfics there. Browse through the relevant categories or use the search bar. Another option is to check out Tumblr. There are often fanfic writers who post their works directly on their Tumblr blogs, and you can find them by searching for the relevant tags or by following fandom - related blogs.
Chapter 575, "The First Time Threatening Someone Feels Quite Marvelous", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Is there really no way to get any money out?" After some...
Chapter 787, "Changing Fortune", is the clearest early answer because it turns Xiao Xue's situation into a concrete plot event. The setup is How could she know about these things?, but the pressure keeps building through Xiao Xue had grown up with Yafei and knew a lot about her, but she....
Chapter 875, "Isn't That Xu Mei's View?", is the clearest early answer because it turns Mom's situation into a concrete plot event.
Chapter 823, "The Jiang Lake Swindler Who Sponges Off Others", is the clearest early answer because it turns Fuhu Mountain's situation into a concrete plot event. The chapter gives readers a real answer by opening on The Yu Family estate is elegant, and even the names of the dishes...
Chapter 845, "Turns Out He is the Body Double!", is the clearest early answer because it turns Mr's situation into a concrete plot event. Early on, During these two hours of waiting for the results, the restaurant was....
Chapter 696, "I Am a Very Narrow-Minded Person", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from But she heard Jiang Li say, "Mom, you don't need to be anxious, I'm...
Chapter 843, "Why the Sudden Change of Heart?!", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Uncle Zhao also expressed that they did all this for money.
Chapter 889, "Nice to meet you for the first time, please take care of me!", is the clearest early answer because it turns Ji Yanbai's situation into a concrete plot event. It opens with She said why do other prisoners get a chance to go outside, while she...
Chapter 881, "How to Deal with Her Few Younger Brothers?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with After settling Jiang Li in the car, Zhao Lang fetched the medical kit... and closes on It was Jiang Cheng in pajamas..