Archive of Our Own (AO3) is also a great place to search for it. There are many tags and filters you can use to narrow down your search to exactly what you're looking for, including the 'kenny x butters lemon' pairing.
You can try looking on fanfiction.net. It has a wide variety of fanfics, and there's a good chance you'll find some 'kenny x butters lemon fanfic' there.
The best chapter pointer here is Chapter 51, "The Great Lodging Competition". It opens with Oh, okay." After uttering two syllables indifferently, Jiang Li bent down... and closes on If I opened a bar here, wouldn't I become a savior?" Jiang Yan was....
The best chapter pointer here is Chapter 15, "The Autistic Teen Jiang Shixu". It opens with Jiang Shixu woke up from those nightmares filled with blood and darkness,... and closes on Since she didn't move, Jiang Shixu also stayed put, and the kitchen, which....
The best chapter pointer here is Chapter 52, "Your Child is in Danger Now". It opens with The village chief and the woman behind him exchanged a glance, "This... and closes on And at this point, they might as well try a desperate remedy for a....
Chapter 59 is the strongest chapter-level answer because it starts from After walking for about two or three hundred meters, the old man stopped... and follows through on My phone, my cigarettes, my champagne, oh how I miss you......" He swore,....
A practical answer is Chapter 59, because it turns the idea into a concrete scene. The chapter opens with After walking for about two or three hundred meters, the old man stopped..., adds pressure through Your brother might just be kind enough to take you in., and ends on My phone, my cigarettes.
A practical answer is Chapter 39, because it turns the idea into a concrete scene. The chapter opens with Qi Tianyu had been looking forward to watching Jiang Li's drama unfold., adds pressure through It's not by some great master, I copied it myself., and ends on His original intention was just.
The best chapter pointer here is Chapter 21, "Uncle Policeman, They Are the Ones Causing Trouble!". It opens with Jiang Li's clear and logical explanation had everyone stunned in place. and closes on But the implications could be different..
The best chapter pointer here is Chapter 48, "All the Bitter Teas Have Been Taken Away". It opens with He Yun felt guilty for initially ignoring Jiang Li on purpose, and with... and closes on Besides, everyone's phones will be replaced with special smartphones....
A practical answer is Chapter 8, because it turns the idea into a concrete scene. The chapter opens with The resentment that had barely calmed among the crowd surged back two..., adds pressure through Why keep harping on the fact that he wasn't a decent man?, and ends on Other people with a.
The best chapter pointer here is Chapter 49, "Mysticism Girl Jiang Li". It opens with My phone!!!" Jiang Yan's roar echoed continuously through the mountains in... and closes on Thinking this, Jiang Yan marched forward, pulled Jiang Li down from her....